WO2014001702A1 - Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit - Google Patents

Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit Download PDF

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Publication number
WO2014001702A1
WO2014001702A1 PCT/FR2013/051473 FR2013051473W WO2014001702A1 WO 2014001702 A1 WO2014001702 A1 WO 2014001702A1 FR 2013051473 W FR2013051473 W FR 2013051473W WO 2014001702 A1 WO2014001702 A1 WO 2014001702A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump unit
sealing ring
separator
primary pump
temperature
Prior art date
Application number
PCT/FR2013/051473
Other languages
French (fr)
Inventor
Olivier Philippart
Original Assignee
Jspm
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jspm filed Critical Jspm
Priority to CA2877212A priority Critical patent/CA2877212A1/en
Priority to JP2015517834A priority patent/JP2015528896A/en
Priority to CN201380033642.5A priority patent/CN104620027A/en
Priority to BR112014032566A priority patent/BR112014032566A2/en
Priority to EP13744618.3A priority patent/EP2864676A1/en
Priority to US14/409,836 priority patent/US20150192142A1/en
Priority to RU2015102015A priority patent/RU2015102015A/en
Priority to KR20157001350A priority patent/KR20150032300A/en
Publication of WO2014001702A1 publication Critical patent/WO2014001702A1/en
Priority to ZA2014/09510A priority patent/ZA201409510B/en
Priority to IN11210DEN2014 priority patent/IN2014DN11210A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/14—Shaft sealings operative only when pump is inoperative
    • F04D29/146—Shaft sealings operative only when pump is inoperative especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • F16J15/3212—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings with metal springs

Definitions

  • the field of the invention is that of the primary pump units of pressurized water nuclear reactors (PWRs).
  • PWRs pressurized water nuclear reactors
  • the invention relates to a passive off-line seal (DEA) for controlling a primary coolant leak resulting from the failure of the seal system present on the primary pump unit.
  • DEA passive off-line seal
  • DEA Shut-off devices
  • shut-off devices In this acci- dent situation and after stopping the primary pump, the shut-off devices must be able to control and stop a leakage of the primary coolant resulting from the failure of the seal system. of the primary pump unit.
  • this type of device is activated by an auxiliary source (such as for example a pressurized nitrogen circuit) and the triggering is controlled by information delivered by the control command of the reactor, in case of loss of the cooling sources of the reactor.
  • auxiliary source such as for example a pressurized nitrogen circuit
  • the described sealing device is a bulky device and its mounting in a joint system of a primary pump unit is relatively complex.
  • the invention aims to propose an improvement of such a sealing device to reduce its size and thus its mounting on the shaft seal systems of primary pump units in service.
  • a passive shutdown seal device for a primary pump unit shaft seal system comprising:
  • a split seal ring having an inactivated position and an activated position
  • a separator made of a fusible material capable of changing state from a temperature threshold, called a change of state threshold, said separator keeping said sealing ring split in its inactivated position when the temperature of the device is less than the change of state temperature threshold;
  • said device being characterized in that said device comprises circular elastic means positioned around the split sealing ring, said resilient means being adapted to bring said sealing ring into its activated position when the temperature is greater than or equal to the threshold value of change of state of said separator.
  • change of state is intended to mean a modification of the mechanical characteristics of the fusible material.
  • the invention it is possible to stop a leakage of the primary coolant resulting from the failure of the seal system of the primary pump unit without the need for an auxiliary source of activation.
  • the design of the device according to the invention allows a simplified implementation on the architectures of the primary pump units already in service.
  • the device according to the invention it is also possible to adjust the device to the operating constraints of each type of nuclear reactor by adjusting the self-activation temperature of the device, and more specifically by modifying the composition. of the fuse element.
  • first temperature change threshold of the material from which the fuse material separator changes state that is to say that its mechanical characteristics change
  • a temperature threshold of activation of the DEA device which may be different and greater than the temperature of the change of state threshold, from which the separator is no longer able to withstand the force exerted by the elastic means, thus bringing the ring of sealing in its activated position.
  • said elastic means bring said sealing ring into its activated position when the temperature is greater than or equal to the value of an activation threshold of the device, the temperature of the activation threshold being greater than the temperature of the threshold of change; state;
  • said device is adapted to be integrated on a system of joints of a primary pump unit shaft in use;
  • split seal ring is made of polymer resistant to temperatures above 300 ° C .
  • split seal ring is made of polyetheretherketone, or polyetheretherketone matrix composite loaded with glass or carbon fibers;
  • said circular elastic means exert a compressive force on said sealing ring;
  • said sealing ring comprises a peripheral annular groove adapted to receive said circular elastic means;
  • said separator made of a fusible material is adapted to mechanically withstand the force exerted by the elastic means to a temperature threshold of between 80 ° C and 260 ° C, preferably equal to 150 ° C;
  • said separator and the sealing ring are in one piece.
  • said separator may be formed by a part independent of the sealing ring and attached at the opening of the ring by fixing means.
  • the subject of the invention is also a primary pump unit comprising:
  • a seal system adapted to achieve a controlled leak established along a leak path arranged along the shaft of the primary pump unit;
  • a passive stopping device adapted to at least partially close said leakage path of said seal system when said seal system fails and when said sealing ring is brought into its activated position by said seal system; circular elastic means, so as to achieve a controlled leak.
  • FIG. 1 illustrates a partial view of a joint system of a primary pump unit
  • FIG. 2 illustrates a sectional view of a passive stopping device according to the invention in its rest position integrated in a seal system of a primary pump unit, as partially shown in Figure 1;
  • - Figure 3 illustrates a sectional view of a passive stop device according to the invention in its activated position, integrated in a joint system of a primary pump unit, as partially shown in Figure 1;
  • FIG. 4 illustrates a perspective view of the sealing ring of the stop device according to the invention
  • FIG. 5 is a detail view at the slot of the sealing ring of the stop device according to the invention.
  • FIG. 6 is a detail view at the slot of the sealing ring of a second embodiment of the stop device according to the invention
  • the primary pumps of pressurized water reactors are centrifugal type with vertical axis.
  • the dynamic sealing at the shaft outlet 10 (FIG. 1) is ensured by a joint system consisting of three stages.
  • the first floor is called seal n ° 1.
  • the seal No. 1, referenced J1 is a hydrostatic seal leak controlled. In normal operation, a leakage flow, illustrated by the arrow F1, is established along the shaft 10.
  • Figure 1 shows more particularly the leakage path F1 along the shaft 10 between the seal No. 1 J1 and the seal No. 2 (referenced J2) located upstream of the seal No. 1.
  • the DEA device 20 according to the invention is positioned on the escape path F1 and more precisely at the zone represented by the reference Z, so as to block the flow of the leakage flow along the shaft 10 during an accidental situation.
  • FIG. 2 more particularly illustrates a sectional view of the sealing device 20 according to the invention during normal operating conditions of the primary pump unit, that is to say when the temperature of the leakage flow rate is less than a value. predetermined threshold.
  • Figure 3 illustrates a sectional view of the sealing device in its activated position, that is to say during accident situations of operation of the primary pump unit.
  • the stationary sealing device 20 according to the invention comprises:
  • the stop seal 20 may further comprise a first contact ring 24 arranged between the bushing 15 of the seal No. 1 and the split seal ring 23 and a second contact ring 26. positioned in contact with the split seal ring 23 and adapted to come into contact with the support piece of the floating crew of seal No. 1.
  • the first contact ring 24 is made of steel or nickel alloy.
  • the second contact ring 26 has a chromed face in contact with the sealing ring 23.
  • the chromed coating of the face in contact with the sealing ring 23 makes it possible to reduce the coefficient of friction between the ring 23 and the second ring 26. Indeed, in case of stopping pumps by loss of power (SBO), the stop device 20 can be triggered by increasing the temperature before the pump shaft is completely stopped. Such a chromed coating therefore makes it possible not to damage the second sealing ring 26.
  • the sealing ring 23 has a peripheral groove 25 on its outer circumference whose shape and dimensions are adapted to receive the elastic means 22.
  • the split sealing ring 23 is maintained in its inactivated position, as shown in FIGS. 1 and 4, by means of the fusible separator 27.
  • the fusible separator 27 is made of a polymer material advantageously chosen according to its temperature of 25.degree. degradation and its loss of mechanical characteristics.
  • the separator 27 is characterized so as to be able to withstand the force exerted by the elastic means 22 to a temperature threshold of between 80 ° C. and 260 ° C. and advantageously equal to 150 ° C.
  • the fusible separator 27 is in the form of a beam capable of keeping the two ends of the split sealing ring 23 (inactivated position) in the separated position during the normal operation of the primary motor pump unit.
  • the sealing ring 23 is kept back from the escape path F1.
  • the split sealing ring 23 is locked in this position by the fusible separator 27.
  • the increase in the temperature of the leakage flow has the effect of increasing the temperature in the vicinity of the device. 20, and in particular the temperature of the fusible separator 27.
  • said threshold state change predefined according to the nature of the fusible separator 27, it is degraded instantly or gradually no longer ensuring sufficient strength to withstand the stress circumferential compression generated by the elastic means 22.
  • the loss of the mechanical characteristics of the fusible separator, and in particular the fall of the flexural modulus occurs when the temperature is greater than the glass transition temperature of the material in which the fusible separator 27 is realized.
  • a first temperature change threshold of the material from which the fusible separator 27 has initiated a change of state that is to say that its mechanical characteristics are modified
  • an activation temperature threshold of the device DEA from which the fusible separator 27 collapses because it is no longer able to withstand the force exerted by the elastic means 22, thereby causing the sealing ring 23 in its activated position.
  • the triggering of the device 20 corresponding to the exceeding of the state change threshold of the fusible separator 27 and the activation of the device are combined.
  • the losses of the mechanical characteristics are almost instantaneous.
  • the activation of the device 20 operates in an off-set manner with respect to the triggering of the device by the exceeding of the change of state temperature threshold.
  • the losses of the mechanical characteristics are progressive and lead to a collapse of the fusible separator 27 at a different time and / or at a temperature higher than the temperature of the change of state threshold.
  • Fusible separator 27 advantageously has notches 28, or zones having a thinning of material, capable of guiding the flaming and deformation of fusible separator 27.
  • Such notches 28 allow for example to guide the deformation of the separator in the direction axial or in the radial direction of the sealing ring 23
  • the notches 28 are machined at the center and at the ends of the fusible separator 27.
  • a free space in the vicinity of the fusible separator so as not to interfere with the deformation of the fusible separator 27. separator. This space may be for example a notch (not shown) in the bushing January 1 seal 1 facing the circumferential position of the fusible separator 27 in the case of a radial deformation of the fusible separator 27.
  • the force exerted by the elastic means 22, encircling the sealing ring 23, modifies the diameter of the sealing ring 23 in such a way that that it comes to tighten against the shaft of the rotor 10.
  • the sealing ring 23 ensures the blocking of the escape path F1 by virtue of the circumferential force exerted by the elastic means 22 combined with the loss of the mechanical characteristics of the separator no longer ensuring its separation function. .
  • the blocking of the leak is ensured in addition by the autoclave effect induced by the increase of the pressure upstream of the sealing device 20 in the activated position.
  • the sealing ring 23 of the stop device 20 may be made of a polymer material resistant to high temperatures (ie greater than 300 ° C.), such as, for example, lyetheretherketone (PEEK) or a PEEK composite filled with glass or carbon fibers.
  • PEEK lyetheretherketone
  • the fusible separator 27 is of the same nature as the body of the sealing ring 23 and is advantageously monobloc.
  • the fuse separator 127 is formed by an independent piece (ie not a single piece) of the sealing ring 123 which is attached at the level of the opening of the ring. 123.
  • Such a configuration makes it possible to produce the fusible separator 127 in a material of a different nature from the material used by the embodiment of the sealing ring 123 and which also has a loss of mechanical characteristics sufficient to trigger and activate the device from a given temperature threshold.
  • the fusible separator 127 may be made of PEEK loaded with carbon fiber and the sealing ring 123 may be made of graphite.
  • This second embodiment makes it possible to simplify the design of the sealing ring 123 as well as the achievement of a covering at the level of the opening of the ring 123 in order to reinforce the effectiveness of the seal. chéotti.
  • the fusible splitter 127 assembly on the sealing ring 123 can be made by various methods; preferentially, the assembly is of the type mortise and tenon.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sealing Devices (AREA)

Abstract

The present invention concerns a passive shutdown sealing device (20) for a primary motorised pump unit comprising: a split sealing ring (23) having an inactivated position and an activated position; a separator (27) made from a fusible material capable of changing state from a temperature threshold, called state change threshold, said separator (27) holding said split sealing ring (23) in the inactivated position of same when the temperature of the device (20) is lower than said state change temperature threshold; said device being characterised in that it comprises circular elastic means (22) positioned around the split sealing ring (23), said elastic means (22) being designed to bring said sealing ring (23) into the activated position of same when the temperature is greater than or equal to the state change threshold value of said separator (27).

Description

DISPOSITIF D'ETANCHEITE A L'ARRET PASSIF  PASSIVE STOP SEALING DEVICE
POUR SYSTEME DE JOINTS D'ARBRE D'UN  FOR SYSTEM OF TREE JOINTS OF A
GROUPE MOTOPOMPE PRIMAIRE.  PRIMARY MOTOR PUMP GROUP.
DOMAINE TECHNIQUE TECHNICAL AREA
Le domaine de l'invention est celui des groupes motopompes primaires de réacteurs nucléaires à eau sous pression (REP). The field of the invention is that of the primary pump units of pressurized water nuclear reactors (PWRs).
L'invention concerne plus particulièrement, un dispositif d'étanchéité à l'arrêt (DEA) passif permettant de contrôler une fuite de fluide de refroidissement primaire résultant de la défaillance du système de joints présent sur le groupe motopompe primaire. More particularly, the invention relates to a passive off-line seal (DEA) for controlling a primary coolant leak resulting from the failure of the seal system present on the primary pump unit.
ETAT DE LA TECHNIQUE STATE OF THE ART
Les dispositifs d'étanchéité à l'arrêt (DEA) ont été développés dans les réacteurs nucléaires à eau sous pression de nouvelles générations pour faire face à une défaillance du système de joints du groupe motopompe primaire suite à une situation accidentelle de Perte Totale de l'Alimentation Electrique (PTAE), également appelée, SBO (pour Station Black Out en langue anglaise). Shut-off devices (DEA) have been developed in new generation pressurized water reactors to deal with a failure of the primary pump unit seal system following an accidental Total Loss Power Supply (PTAE), also known as SBO (for Black Out Station in English).
Ainsi, les dispositifs d'étanchéité à l'arrêt doivent, dans cette situation acci- dentelle et après l'arrêt de la pompe primaire, permettre de contrôler et de stopper une fuite du fluide de refroidissement primaire résultant de la défaillance du système de joints du groupe motopompe primaire. Thus, in this acci- dent situation and after stopping the primary pump, the shut-off devices must be able to control and stop a leakage of the primary coolant resulting from the failure of the seal system. of the primary pump unit.
Classiquement, ce type de dispositif est activé par une source auxiliaire (telle que par exemple un circuit d'azote sous pression) et le déclenchement est piloté par une information délivrée par le contrôle commande du réacteur, en cas de perte des sources de refroidissement du groupe motopompe primaire. Conventionally, this type of device is activated by an auxiliary source (such as for example a pressurized nitrogen circuit) and the triggering is controlled by information delivered by the control command of the reactor, in case of loss of the cooling sources of the reactor. primary motor pump unit.
Dans le but de s'affranchir de l'utilisation d'une source d'activation, il a été développé un dispositif d'étanchéité à l'arrêt passif ne nécessitant aucun système auxiliaire d'activation, ni d'élaboration d'une information de déclen- chement au niveau du contrôle commande du réacteur. Un tel dispositif d'étanchéité à l'arrêt passif est décrit dans le document WO 2010/068615. In order to overcome the use of an activation source, it has been developed a passive shut-off sealing device that does not require any auxiliary activation system, nor the development of information trigger at the level of reactor control. Such a passive off-state sealing device is described in WO 2010/068615.
Toutefois, le dispositif d'étanchéité décrit est un dispositif encombrant et son montage dans un système de joints d'un groupe motopompe primaire est relativement complexe. However, the described sealing device is a bulky device and its mounting in a joint system of a primary pump unit is relatively complex.
EXPOSE DE L'INVENTION SUMMARY OF THE INVENTION
Dans ce contexte l'invention vise à proposer une amélioration d'un tel dispositif d'étanchéité permettant de réduire son encombrement et ainsi son montage sur les systèmes de joints d'arbre de groupes motopompes primaires en service. In this context the invention aims to propose an improvement of such a sealing device to reduce its size and thus its mounting on the shaft seal systems of primary pump units in service.
A cette fin, l'invention propose un dispositif d'étanchéité à l'arrêt passif pour système de joints d'arbre de groupe motopompe primaire comportant : To this end, the invention proposes a passive shutdown seal device for a primary pump unit shaft seal system comprising:
- un anneau d'étanchéité fendu présentant une position inactivée et une position activée ;  - A split seal ring having an inactivated position and an activated position;
- un séparateur réalisé dans un matériau fusible apte à changer d'état à partir d'un seuil de température, dit seuil de changement d'état, ledit séparateur maintenant ledit anneau d'étanchéité fendu dans sa position inactivée lorsque la température du dispositif est inférieure au seuil de température de changement d'état ;  a separator made of a fusible material capable of changing state from a temperature threshold, called a change of state threshold, said separator keeping said sealing ring split in its inactivated position when the temperature of the device is less than the change of state temperature threshold;
ledit dispositif étant caractérisé en ce que ledit dispositif comporte des moyens élastiques circulaires positionnés autour de l'anneau d'étanchéité fendu, lesdits moyens élastiques étant adaptés pour amener ledit anneau d'étanchéité dans sa position activée lorsque la température est supérieure ou égale à la valeur seuil de changement d'état dudit séparateur. On entend par les termes « changer d'état », une modification des caractéristiques mécaniques du matériau fusible. said device being characterized in that said device comprises circular elastic means positioned around the split sealing ring, said resilient means being adapted to bring said sealing ring into its activated position when the temperature is greater than or equal to the threshold value of change of state of said separator. The term "change of state" is intended to mean a modification of the mechanical characteristics of the fusible material.
Grâce à l'invention, il est possible de stopper une fuite du fluide de refroidissement primaire résultant de la défaillance du système de joints du groupe motopompe primaire sans nécessité d'une source auxiliaire d'activation. La conception du dispositif selon l'invention permet une implantation simplifiée sur les architectures des groupes motopompes primaires déjà en service. Thanks to the invention, it is possible to stop a leakage of the primary coolant resulting from the failure of the seal system of the primary pump unit without the need for an auxiliary source of activation. The design of the device according to the invention allows a simplified implementation on the architectures of the primary pump units already in service.
Grâce au dispositif selon l'invention, il est également possible d'ajuster le dispositif aux contraintes de fonctionnement de chaque type de réacteur nucléaire par le réglage de la température d'auto-activation du dispositif, et plus précisément par la modification de la composition de l'élément fusible. Thanks to the device according to the invention, it is also possible to adjust the device to the operating constraints of each type of nuclear reactor by adjusting the self-activation temperature of the device, and more specifically by modifying the composition. of the fuse element.
Il est également possible de définir un premier seuil de température de changement d'état du matériau à partir duquel le séparateur matériau fusible change d'état, c'est-à-dire que ses caractéristiques mécaniques se modifient, et un seuil de température d'activation du dispositif DEA qui peut être différent et supérieur à la température du seuil de changement d'état, à partir duquel le séparateur n'est plus apte à résister à l'effort exercé par les moyens élastiques, amenant ainsi l'anneau d'étanchéité dans sa position activée. It is also possible to define a first temperature change threshold of the material from which the fuse material separator changes state, that is to say that its mechanical characteristics change, and a temperature threshold of activation of the DEA device which may be different and greater than the temperature of the change of state threshold, from which the separator is no longer able to withstand the force exerted by the elastic means, thus bringing the ring of sealing in its activated position.
Le dispositif d'étanchéité à l'arrêt passif selon l'invention peut également présenter une ou plusieurs des caractéristiques ci-dessous prises individuellement ou selon toutes les combinaisons techniquement possibles : The passive stopping device according to the invention may also have one or more of the following characteristics taken individually or in any technically possible combination:
- lesdits moyens élastiques amènent ledit anneau d'étanchéité dans sa position activée lorsque la température est supérieure ou égale à la valeur d'un seuil d'activation du dispositif, la température du seuil d'activation étant supérieure à la température du seuil de changement d'état ;  said elastic means bring said sealing ring into its activated position when the temperature is greater than or equal to the value of an activation threshold of the device, the temperature of the activation threshold being greater than the temperature of the threshold of change; state;
- ledit dispositif est adapté pour être intégré sur un système de joints d'un arbre de groupe motopompe primaire en service ;  said device is adapted to be integrated on a system of joints of a primary pump unit shaft in use;
- ledit anneau d'étanchéité fendu est en polymère résistant à des températures supérieures à 300 °C ;  said split seal ring is made of polymer resistant to temperatures above 300 ° C .;
- ledit anneau d'étanchéité fendu est en polyétheréthercétone, ou en composite à matrice polyétheréthercétone chargée en fibres de verre ou de carbone ;  said split seal ring is made of polyetheretherketone, or polyetheretherketone matrix composite loaded with glass or carbon fibers;
- lesdits moyens élastiques circulaires exercent un effort de compression sur ledit anneau d'étanchéité ; - ledit anneau d'étanchéité comporte une gorge annulaire périphérique apte à recevoir lesdits moyens élastiques circulaires ; said circular elastic means exert a compressive force on said sealing ring; said sealing ring comprises a peripheral annular groove adapted to receive said circular elastic means;
- ledit séparateur réalisé dans un matériau fusible est adapté à résister mécaniquement à l'effort exercé par les moyens élastiques jusqu'à un seuil de température compris entre 80°C et 260°C, avantageusement égal à 150°C ;  - said separator made of a fusible material is adapted to mechanically withstand the force exerted by the elastic means to a temperature threshold of between 80 ° C and 260 ° C, preferably equal to 150 ° C;
- ledit séparateur et l'anneau d'étanchéité sont monobloc.  said separator and the sealing ring are in one piece.
- ledit séparateur peut être formé par une pièce indépendante de l'anneau d'étanchéité et rapportée au niveau de l'ouverture de l'anneau par des moyens de fixation. said separator may be formed by a part independent of the sealing ring and attached at the opening of the ring by fixing means.
L'invention a également pour objet un groupe motopompe primaire comportant : The subject of the invention is also a primary pump unit comprising:
un système de joints adapté pour réaliser une fuite contrôlée s'établissant le long d'un chemin de fuite agencé le long de l'arbre du groupe motopompe primaire ;  a seal system adapted to achieve a controlled leak established along a leak path arranged along the shaft of the primary pump unit;
un dispositif d'étanchéité à l'arrêt passif selon l'invention adapté pour obturer au moins partiellement ledit chemin de fuite dudit système de joints lorsque ledit système de joint est défaillant et lorsque ledit anneau d'étanchéité est amené dans sa position activée par lesdits moyens élastiques circulaires, de manière à réaliser une fuite contrôlée.  a passive stopping device according to the invention adapted to at least partially close said leakage path of said seal system when said seal system fails and when said sealing ring is brought into its activated position by said seal system; circular elastic means, so as to achieve a controlled leak.
BREVES DESCRIPTION DES FIGURES BRIEF DESCRIPTION OF THE FIGURES
D'autres caractéristiques et avantages de l'invention ressortiront plus clairement de la description qui en est donnée ci-dessous, à titre indicatif et nullement limitatif, en référence aux figures annexées, parmi lesquelles : Other features and advantages of the invention will emerge more clearly from the description which is given below, by way of indication and in no way limitative, with reference to the appended figures, among which:
- la figure 1 illustre une vue partielle d'un système de joints d'un groupe motopompe primaire ;  - Figure 1 illustrates a partial view of a joint system of a primary pump unit;
- la figure 2 illustre une vue en coupe d'un dispositif d'arrêt passif selon l'invention dans sa position de repos intégré dans un système de joints d'un groupe motopompe primaire, tel que représenté partiellement à la figure 1 ; - la figure 3 illustre une vue en coupe d'un dispositif d'arrêt passif selon l'invention dans sa position activée, intégré dans un système de joints d'un groupe motopompe primaire, tel que représenté partiellement à la figure 1 ; - Figure 2 illustrates a sectional view of a passive stopping device according to the invention in its rest position integrated in a seal system of a primary pump unit, as partially shown in Figure 1; - Figure 3 illustrates a sectional view of a passive stop device according to the invention in its activated position, integrated in a joint system of a primary pump unit, as partially shown in Figure 1;
- la figure 4 illustre une vue en perspective de l'anneau d'étanchéité du dispositif d'arrêt selon l'invention ;  - Figure 4 illustrates a perspective view of the sealing ring of the stop device according to the invention;
- la figure 5 est une vue de détail au niveau de la fente de l'anneau d'étanchéité du dispositif d'arrêt selon l'invention ;  - Figure 5 is a detail view at the slot of the sealing ring of the stop device according to the invention;
- la figure 6 est une vue de détail au niveau de la fente de l'anneau d'étanchéité d'un deuxième mode de réalisation du dispositif d'arrêt selon l'invention - Figure 6 is a detail view at the slot of the sealing ring of a second embodiment of the stop device according to the invention
Pour plus de clarté, les éléments identiques ou similaires sont repérés par des signes de références identiques sur l'ensemble des figures. For the sake of clarity, identical or similar elements are identified by identical reference signs throughout the figures.
DESCRIPTION DETAILLEE D'AU MOINS UN MODE DE REALISATION DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT
Les pompes primaires des réacteurs à eau sous pression sont de type centrifuge à axe vertical. L'étanchéité dynamique en sortie d'arbre 10 (figure 1 ) est assurée par un système de joints constitué de trois étages. The primary pumps of pressurized water reactors are centrifugal type with vertical axis. The dynamic sealing at the shaft outlet 10 (FIG. 1) is ensured by a joint system consisting of three stages.
Le premier étage est baptisé joint n°1 . Le joint n°1 , référencé J1 , est un joint hydrostatique à fuite contrôlée. En fonctionnement normal, un débit de fuite, illustré par la flèche F1 , s'établit le long de l'arbre 10. The first floor is called seal n ° 1. The seal No. 1, referenced J1, is a hydrostatic seal leak controlled. In normal operation, a leakage flow, illustrated by the arrow F1, is established along the shaft 10.
En situation accidentelle, la température du fluide en entrée du joint n°1 subit une élévation rapide de température pour atteindre une valeur proche de la température du circuit primaire, soit environ 280°C. A cette température, les performances du joint n°1 sont dégradées ce qui entraine une augmentation très importante de débit de fuite qui peut dépasser 10 m3 par heure. Les dispositifs d'étanchéité à l'arrêt (DEA) passifs sont destinés dans cette situation accidentelle à bloquer le chemin de fuite F1 en aval du joint n°1 , sans l'utilisation d'une source d'activation. In accidental situation, the temperature of the fluid entering the seal No. 1 undergoes a rapid rise in temperature to reach a value close to the temperature of the primary circuit, about 280 ° C. At this temperature, the performance of the seal No. 1 are degraded which causes a very significant increase in leakage rate that can exceed 10 m 3 per hour. In this accidental situation, passive shutdown devices (DEA) are designed to block the F1 escape path downstream of the No. 1 seal, without the use of an activation source.
La figure 1 représente plus particulièrement le chemin de fuite F1 le long de l'arbre 10 entre le joint n°1 J1 et le joint n°2 (référencé J2) situé en amont du joint n°1 . Avantageusement, le dispositif DEA 20 selon l'invention est positionné sur le chemin de fuite F1 et plus précisément au niveau de la zone représentée par la référence Z, de manière à pouvoir bloquer l'écoulement du débit de fuite le long de l'arbre 10 lors d'une situation accidentelle. La figure 2 illustre plus particulièrement une vue en coupe du dispositif d'étanchéité 20 selon l'invention lors des conditions normales de fonctionnement du groupe motopompe primaire, c'est-à-dire lorsque la température du débit de fuite est inférieure à une valeur seuil prédéterminée. Figure 1 shows more particularly the leakage path F1 along the shaft 10 between the seal No. 1 J1 and the seal No. 2 (referenced J2) located upstream of the seal No. 1. Advantageously, the DEA device 20 according to the invention is positioned on the escape path F1 and more precisely at the zone represented by the reference Z, so as to block the flow of the leakage flow along the shaft 10 during an accidental situation. FIG. 2 more particularly illustrates a sectional view of the sealing device 20 according to the invention during normal operating conditions of the primary pump unit, that is to say when the temperature of the leakage flow rate is less than a value. predetermined threshold.
Par ailleurs, la figure 3 illustre une vue en coupe du dispositif d'étanchéité dans sa position activée, c'est-à-dire lors des situations accidentelles de fonctionnement du groupe motopompe primaire. Furthermore, Figure 3 illustrates a sectional view of the sealing device in its activated position, that is to say during accident situations of operation of the primary pump unit.
Le dispositif d'étanchéité à l'arrêt 20 selon l'invention comporte : The stationary sealing device 20 according to the invention comprises:
un anneau d'étanchéité fendu 23 positionné concentriquement autour de l'arbre 10 du groupe motopompe primaire ;  a split sealing ring 23 concentrically positioned around the shaft 10 of the primary pump unit;
- des moyens élastiques 22 adaptés pour contraindre en compression de façon circonférentielle l'anneau d'étanchéité fendu 23 ;  - Elastic means 22 adapted to constrain in compression circumferentially the split seal ring 23;
un séparateur 27, illustré aux figures 4 et 5, réalisé dans un matériau fusible adapté pour maintenir ledit anneau d'étanchéité fendu dans sa position inactivée, ou de repos, tant que la température du dispositif reste inférieure à un seuil de température qui sera défini par la suite.  a separator 27, illustrated in FIGS. 4 and 5, made of a fusible material adapted to maintain said split seal ring in its inactivated position, or of rest, as long as the temperature of the device remains below a temperature threshold which will be defined thereafter.
Le dispositif d'étanchéité à l'arrêt 20 selon l'invention peut comporter en outre une première bague de contact 24 agencée entre la douille 15 du joint n°1 et l'anneau d'étanchéité fendu 23 et une deuxième bague de contact 26 positionnée au contact de l'anneau d'étanchéité fendu 23 et apte venir au contact de la pièce support de l'équipage flottant du joint n°1 . The stop seal 20 according to the invention may further comprise a first contact ring 24 arranged between the bushing 15 of the seal No. 1 and the split seal ring 23 and a second contact ring 26. positioned in contact with the split seal ring 23 and adapted to come into contact with the support piece of the floating crew of seal No. 1.
A titre d'exemple, la première bague de contact 24 est réalisée en acier ou en alliage de nickel. La deuxième bague de contact 26 présente une face chromée au contact de l'anneau d'étanchéité 23 Le revêtement chromé de la face au contact de l'anneau d'étanchéité 23 permet de réduire le coeffi- cient de frottement entre l'anneau d'étanchéité 23 et la deuxième bague 26. En effet, en cas d'arrêt des pompes par perte d'alimentation électrique (SBO), le dispositif d'arrêt 20 peut être déclenché par augmentation de la température avant l'arbre de la pompe ne soit totalement à l'arrêt. Un tel revêtement chromé permet par conséquent de ne pas endommager la deuxième bague d'étanchéité 26. For example, the first contact ring 24 is made of steel or nickel alloy. The second contact ring 26 has a chromed face in contact with the sealing ring 23. The chromed coating of the face in contact with the sealing ring 23 makes it possible to reduce the coefficient of friction between the ring 23 and the second ring 26. Indeed, in case of stopping pumps by loss of power (SBO), the stop device 20 can be triggered by increasing the temperature before the pump shaft is completely stopped. Such a chromed coating therefore makes it possible not to damage the second sealing ring 26.
L'anneau d'étanchéité 23 présente une gorge périphérique 25 sur son pour- tour extérieur dont la forme et les dimensions sont adaptées pour recevoir les moyens élastiques 22. The sealing ring 23 has a peripheral groove 25 on its outer circumference whose shape and dimensions are adapted to receive the elastic means 22.
L'anneau d'étanchéité fendu 23 est maintenu dans sa position inactivée, telle que représentée aux figures 1 et 4, au moyen du séparateur fusible 27. Le séparateur fusible 27 est réalisé en matériau polymère choisi avantageu- sèment en fonction de sa température de dégradation et de sa perte des caractéristiques mécaniques. The split sealing ring 23 is maintained in its inactivated position, as shown in FIGS. 1 and 4, by means of the fusible separator 27. The fusible separator 27 is made of a polymer material advantageously chosen according to its temperature of 25.degree. degradation and its loss of mechanical characteristics.
Le choix du polymère du séparateur fusible 27 ainsi que ses dimensions sont réalisés en fonction de la température de dégradation souhaitée. Avantageusement, le séparateur 27 est caractérisé de manière à pouvoir résister à l'effort exercé par les moyens élastiques 22 jusqu'à un seuil de température compris entre 80°C et 260°C et avantageusement égal à 150°C. The choice of the polymer fusible separator 27 and its dimensions are made depending on the desired degradation temperature. Advantageously, the separator 27 is characterized so as to be able to withstand the force exerted by the elastic means 22 to a temperature threshold of between 80 ° C. and 260 ° C. and advantageously equal to 150 ° C.
Selon le mode de réalisation illustré aux figures 2 à 5, le séparateur fusible 27 présente la forme d'une poutre apte à maintenir en position écartée les deux extrémités de l'anneau d'étanchéité fendu 23 (position inactivée) lors du fonctionnement normal du groupe motopompe primaire. According to the embodiment illustrated in FIGS. 2 to 5, the fusible separator 27 is in the form of a beam capable of keeping the two ends of the split sealing ring 23 (inactivated position) in the separated position during the normal operation of the primary motor pump unit.
Ainsi, en conditions normales de fonctionnement (figure 2), l'anneau d'étanchéité 23 est maintenu en retrait du chemin de fuite F1 . L'anneau d'étanchéité fendu 23 est verrouillé dans cette position par le séparateur fusible 27. En conditions accidentelles (figure 3), l'augmentation de la température du débit de fuite a pour effet d'augmenter la température au voisinage du dispositif d'arrêt 20, et notamment la température du séparateur fusible 27. Lorsque la température du débit de fuite atteint une valeur seuil, dit seuil de changement d'état, prédéfinie en fonction de la nature du séparateur fusible 27, celui-ci se dégrade instantanément ou progressivement n'assurant plus par conséquent une résistance mécanique suffisante pour résister à l'effort circonférentiel de compression généré par les moyens élastiques 22. La perte des caractéristiques mécaniques du séparateur fusible, et notamment la chute du module de flexion, intervient lorsque la température est supérieure égale à la température de transition vitreuse du matériau dans lequel le séparateur fusible 27 est réalisé. Thus, under normal operating conditions (FIG. 2), the sealing ring 23 is kept back from the escape path F1. The split sealing ring 23 is locked in this position by the fusible separator 27. In accident conditions (FIG. 3), the increase in the temperature of the leakage flow has the effect of increasing the temperature in the vicinity of the device. 20, and in particular the temperature of the fusible separator 27. When the temperature of the leakage flow reaches a threshold value, said threshold state change, predefined according to the nature of the fusible separator 27, it is degraded instantly or gradually no longer ensuring sufficient strength to withstand the stress circumferential compression generated by the elastic means 22. The loss of the mechanical characteristics of the fusible separator, and in particular the fall of the flexural modulus, occurs when the temperature is greater than the glass transition temperature of the material in which the fusible separator 27 is realized.
En fonction de la nature du matériau fusible utilisé, il est également possible de définir un premier seuil de température de changement d'état du matériau à partir duquel le séparateur fusible 27 a amorcé un changement d'état, c'est-à-dire que ses caractéristiques mécaniques se modifient, et un seuil de température d'activation du dispositif DEA à partir duquel le séparateur fusible 27 s'effondre car il n'est plus apte à résister à l'effort exercé par les moyens élastiques 22, amenant ainsi l'anneau d'étanchéité 23 dans sa position activée. Depending on the nature of the fuse material used, it is also possible to define a first temperature change threshold of the material from which the fusible separator 27 has initiated a change of state, that is to say that its mechanical characteristics are modified, and an activation temperature threshold of the device DEA from which the fusible separator 27 collapses because it is no longer able to withstand the force exerted by the elastic means 22, thereby causing the sealing ring 23 in its activated position.
Ainsi, selon une première variante de réalisation, le déclenchement du dis- positif 20, correspondant au dépassement du seuil de changement d'état du séparateur fusible 27 et l'activation du dispositif sont confondue. Dans cette variante de réalisation, les pertes des caractéristiques mécaniques sont quasiment instantanées. Thus, according to a first variant embodiment, the triggering of the device 20 corresponding to the exceeding of the state change threshold of the fusible separator 27 and the activation of the device are combined. In this variant embodiment, the losses of the mechanical characteristics are almost instantaneous.
Selon une deuxième variante de réalisation, l'activation du dispositif 20 in- tervient de façon décalée par rapport au déclenchement du dispositif par le dépassement du seuil de température de changement d'état. Dans cette variante, les pertes des caractéristiques mécaniques sont progressives et conduisent à un effondrement du séparateur fusible 27 à un instant différent et/ou à une température supérieure à la température du seuil de change- ment d'état. According to a second variant of embodiment, the activation of the device 20 operates in an off-set manner with respect to the triggering of the device by the exceeding of the change of state temperature threshold. In this variant, the losses of the mechanical characteristics are progressive and lead to a collapse of the fusible separator 27 at a different time and / or at a temperature higher than the temperature of the change of state threshold.
Le séparateur fusible 27 présente avantageusement des encoches 28, ou des zones présentant un amincissement de matière, aptes à guider le flam- bement et la déformation du séparateur fusible 27. De telles encoches 28 permettent par exemple de guider la déformation du séparateur dans le sens axial ou dans le sens radial de l'anneau d'étanchéité 23 Fusible separator 27 advantageously has notches 28, or zones having a thinning of material, capable of guiding the flaming and deformation of fusible separator 27. Such notches 28 allow for example to guide the deformation of the separator in the direction axial or in the radial direction of the sealing ring 23
Selon un exemple de réalisation illustré à la figure 5, les encoches 28 sont usinées au centre et aux extrémités du séparateur fusible 27. De manière à faciliter la déformation par flambement du séparateur fusible 27 et de manière à assurer une bonne activation du dispositif d'arrêt 20, il peut être nécessaire de prévoir un espace libre à proximité du séparateur fusible de manière à ne pas gêner la déformation du séparateur. Cet espace peut être par exemple une encoche (non représentée) dans la douille 1 1 du joint n°1 en regard de la position circonférentielle du séparateur fusible 27 dans le cas d'une déformation radiale du séparateur fusible 27. According to an exemplary embodiment illustrated in FIG. 5, the notches 28 are machined at the center and at the ends of the fusible separator 27. In order to facilitate the buckling deformation of the fusible separator 27 and to ensure a good activation of the stop device 20, it may be necessary to provide a free space in the vicinity of the fusible separator so as not to interfere with the deformation of the fusible separator 27. separator. This space may be for example a notch (not shown) in the bushing January 1 seal 1 facing the circumferential position of the fusible separator 27 in the case of a radial deformation of the fusible separator 27.
L'anneau d'étanchéité 23 n'étant plus maintenu dans sa position de repos, l'effort exercé par les moyens élastiques 22, encerclant l'anneau d'étanchéité 23, modifie le diamètre de l'anneau d'étanchéité 23 de manière à ce que celui-ci vienne se serrer contre l'arbre du rotor 10. Since the sealing ring 23 is no longer held in its rest position, the force exerted by the elastic means 22, encircling the sealing ring 23, modifies the diameter of the sealing ring 23 in such a way that that it comes to tighten against the shaft of the rotor 10.
Ainsi, en conditions accidentelles, l'anneau d'étanchéité 23 assure le blocage du chemin de fuite F1 grâce à l'effort circonférentiel exercé par les moyens élastiques 22 combiné à la perte des caractéristiques mécaniques du séparateur n'assurant plus sa fonction de séparation. Thus, under accident conditions, the sealing ring 23 ensures the blocking of the escape path F1 by virtue of the circumferential force exerted by the elastic means 22 combined with the loss of the mechanical characteristics of the separator no longer ensuring its separation function. .
Dans un deuxième temps, le blocage de la fuite est assuré en complément par l'effet autoclave induit par l'augmentation de la pression en amont du dispositif d'étanchéité 20 en position activée. In a second step, the blocking of the leak is ensured in addition by the autoclave effect induced by the increase of the pressure upstream of the sealing device 20 in the activated position.
Selon un premier exemple de réalisation, l'anneau d'étanchéité 23 du dispo- sitif d'arrêt 20 peut être réalisé dans un matériau polymère résistant à de hautes températures (i.e. supérieures à 300°C), tel que par exemple du po- lyétheréthercétone (PEEK) ou un composite PEEK chargé de fibres de verre ou de carbone. L'utilisation d'un tel matériau permet d'obtenir à haute température, un anneau d'étanchéité dans un état caoutchoutique lui permettant de se déformer pour épouser la géométrie de son environnement et ainsi assurer une meilleure qualité d'étanchéité. Dans ce mode de réalisation, le séparateur fusible 27 est de même nature que le corps de l'anneau d'étanchéité 23 et sont avantageusement monobloc. According to a first exemplary embodiment, the sealing ring 23 of the stop device 20 may be made of a polymer material resistant to high temperatures (ie greater than 300 ° C.), such as, for example, lyetheretherketone (PEEK) or a PEEK composite filled with glass or carbon fibers. The use of such a material allows to obtain at high temperature, a sealing ring in a rubbery state allowing it to deform to match the geometry of its environment and thus ensure a better sealing quality. In this embodiment, the fusible separator 27 is of the same nature as the body of the sealing ring 23 and is advantageously monobloc.
Selon un second mode de réalisation illustré à la figure 6, le séparateur fu- sible 127 est formé par une pièce indépendante (i.e. non monobloc) de l'anneau d'étanchéité 123 qui est rapportée au niveau de l'ouverture de l'anneau 123. Une telle configuration permet de réaliser le séparateur fusible 127 dans un matériau de nature différente du matériau utilisé par la réalisation de l'anneau d'étanchéité 123 et qui présente par ailleurs une perte de caractéristiques mécaniques suffisante pour pouvoir déclencher et activer le dispositif à partir d'un seuil de température donné. Ainsi à titre d'exemple, le séparateur fusible 127 peut être réalisé en PEEK chargé en fibre de carbone et l'anneau d'étanchéité 123 peut être réalisé en graphite. According to a second embodiment illustrated in FIG. 6, the fuse separator 127 is formed by an independent piece (ie not a single piece) of the sealing ring 123 which is attached at the level of the opening of the ring. 123. Such a configuration makes it possible to produce the fusible separator 127 in a material of a different nature from the material used by the embodiment of the sealing ring 123 and which also has a loss of mechanical characteristics sufficient to trigger and activate the device from a given temperature threshold. Thus, for example, the fusible separator 127 may be made of PEEK loaded with carbon fiber and the sealing ring 123 may be made of graphite.
Ce second mode de réalisation permet de simplifier la conception de l'anneau d'étanchéité 123 ainsi que la réalisation d'un recouvrement au ni- veau de l'ouverture de l'anneau 123 afin de renforcer l'efficacité de l'étan- chéité. L'assemblage du séparateur fusible 127 sur l'anneau d'étanchéité 123 peut être réalisé par divers procédés ; à titre préférentiel, l'assemblage est du type tenon-mortaise. This second embodiment makes it possible to simplify the design of the sealing ring 123 as well as the achievement of a covering at the level of the opening of the ring 123 in order to reinforce the effectiveness of the seal. chéité. The fusible splitter 127 assembly on the sealing ring 123 can be made by various methods; preferentially, the assembly is of the type mortise and tenon.

Claims

REVENDICATIONS
1 . Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire caractérisé en ce qu'il comporte : 1. Passive stop sealing device (20) for a primary pump unit shaft seal system, characterized in that it comprises:
- un anneau d'étanchéité fendu (23, 123) présentant une position inactivée et une position activée ;  - a split sealing ring (23, 123) having an inactivated position and an activated position;
- un séparateur (27, 127) réalisé dans un matériau fusible apte à changer d'état à partir d'un seuil de température, dit seuil de changement d'état, ledit séparateur (27, 127) maintenant ledit anneau d'étanchéité fendu (23, 123) dans sa position inactivée lorsque la température du dispositif (20) est inférieure au dit seuil de température de changement d'état ;  a separator (27, 127) made of a fusible material able to change state from a temperature threshold, called a change of state threshold, said separator (27, 127) holding said split sealing ring; (23, 123) in its inactivated position when the temperature of the device (20) is lower than said change of state temperature threshold;
ledit dispositif étant caractérisé en ce qu'il comporte des moyens élastiques circulaires (22) positionnés autour de l'anneau d'étanchéité fendu (23, 123), lesdits moyens élastiques (22) étant adaptés pour amener ledit anneau d'étanchéité (23, 123) dans sa position activée lorsque la température est supérieure ou égale à la valeur seuil de changement d'état dudit séparateur (27, 127).  said device being characterized in that it comprises circular elastic means (22) positioned around the split sealing ring (23, 123), said elastic means (22) being adapted to bring said sealing ring (23 , 123) in its activated position when the temperature is greater than or equal to the threshold value of change of state of said separator (27, 127).
2. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon la revendication précédente caractérisé en ce que lesdits moyens élastiques amènent ledit anneau d'étanchéité (23, 123) dans sa position activée lorsque la température est supérieure ou égale à la valeur d'un seuil d'activation du dispositif (20), la température du seuil d'activation étant supérieure à la température du seuil de changement d'état. 3. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit dispositif est adapté pour être intégré sur un système de joints d'un arbre de groupe motopompe primaire en service. 2. A passive shut-off seal device (20) for a primary pump unit shaft seal system according to the preceding claim, characterized in that said elastic means bring said sealing ring (23, 123) into its position. activated when the temperature is greater than or equal to the value of an activation threshold of the device (20), the temperature of the activation threshold being greater than the temperature of the change of state threshold. Passive stop seal device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said device is adapted to be integrated on a joint system of a primary pump unit shaft in service.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit anneau d'étanchéité fendu est en polymère résistant à des températures supérieures à 300 °C. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said split sealing ring is made of polymer resistant to temperatures above 300 ° C.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit anneau d'étanchéité fendu est en polyétheréthercétone, ou en composite à matrice polyétheréthercé- tone chargée en fibres de verre ou de carbone. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said split sealing ring is made of polyetheretherketone, or of polyetheretheretherced matrix composite - charged tone of glass fiber or carbon.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que lesdits moyens élastiques circulaires (22) exercent un effort de compression sur ledit anneau d'étanchéité (23). Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said circular elastic means (22) exert a compressive force on said ring gear ring. sealing (23).
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit anneau d'étanchéité (23, 123) comporte une gorge annulaire périphérique (25) apte à recevoir lesdits moyens élastiques circulaires (22). Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said sealing ring (23, 123) comprises a peripheral annular groove ( 25) adapted to receive said circular elastic means (22).
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit séparateur (27, 127) réalisé dans un matériau fusible est adapté à résister mécaniquement à l'effort exercé par les moyens élastiques jusqu'à un seuil de température compris entre 80°C et 260°C, avantageusement égal à 150°C. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the preceding claims, characterized in that said separator (27, 127) made of a fusible material is adapted to withstand mechanically to the force exerted by the elastic means to a temperature threshold of between 80 ° C and 260 ° C, preferably equal to 150 ° C.
Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications précédentes caractérisé en ce que ledit séparateur (27) et l'anneau d'étanchéité (23) sont monobloc. Passive stop sealing device (20) for a primary pump unit shaft seal system according to one of the claims previous characterized in that said separator (27) and the sealing ring (23) are monobloc.
10. Dispositif d'étanchéité à l'arrêt passif (20) pour système de joints d'arbre de groupe motopompe primaire selon l'une des revendications 1 à 8 caractérisé en ce que ledit séparateur (127) peut être formé par une pièce indépendante de l'anneau d'étanchéité (123) et rapportée au niveau de l'ouverture de l'anneau (123) par des moyens de fixation. Passive shutdown sealing device (20) for a primary pump unit shaft seal system according to one of claims 1 to 8, characterized in that said separator (127) can be formed by an independent part. of the sealing ring (123) and attached at the opening of the ring (123) by fixing means.
1 1 . Groupe motopompe primaire caractérisé en ce qu'il comporte : 1 1. Primary motor pump unit characterized in that it comprises:
- un système de joints adapté pour réaliser une fuite contrôlée s'établissant le long d'un chemin de fuite agencé le long de l'arbre du groupe motopompe primaire ;  - A seal system adapted to achieve a controlled leak established along a leak path arranged along the shaft of the primary pump unit;
- un dispositif d'étanchéité à l'arrêt passif (20) selon l'une des revendications précédentes adapté pour obturer au moins partiellement ledit chemin de fuite dudit système de joints lorsque ledit système de joint est défaillant et lorsque ledit anneau d'étanchéité est activé, de manière à réaliser une fuite contrôlée.  - A passive shutoff seal (20) according to one of the preceding claims adapted to at least partially seal said leakage path of said seal system when said seal system is faulty and when said sealing ring is activated, in order to achieve a controlled leak.
PCT/FR2013/051473 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit WO2014001702A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
CA2877212A CA2877212A1 (en) 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit
JP2015517834A JP2015528896A (en) 2012-06-25 2013-06-25 Passive stop sealing device for shaft sealing system of reactor coolant pump set
CN201380033642.5A CN104620027A (en) 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit
BR112014032566A BR112014032566A2 (en) 2012-06-25 2013-06-25 sealing device with passive stop for a primary pump group tree joint system
EP13744618.3A EP2864676A1 (en) 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit
US14/409,836 US20150192142A1 (en) 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals in a reactor coolant pump set
RU2015102015A RU2015102015A (en) 2012-06-25 2013-06-25 PASSIVE EMERGENCY SEALING DEVICE FOR THE SYSTEM OF SHAFT SEALS IN THE ASSEMBLY OF THE REACTOR COOLING PUMP
KR20157001350A KR20150032300A (en) 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit
ZA2014/09510A ZA201409510B (en) 2012-06-25 2014-12-23 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit
IN11210DEN2014 IN2014DN11210A (en) 2012-06-25 2014-12-30

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1256005 2012-06-25
FR1256005A FR2992392B1 (en) 2012-06-25 2012-06-25 PASSIVE STOP SEALING DEVICE FOR SHAFT JOINT SYSTEM OF PRIMARY MOTOR PUMP GROUP

Publications (1)

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WO2014001702A1 true WO2014001702A1 (en) 2014-01-03

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PCT/FR2013/051473 WO2014001702A1 (en) 2012-06-25 2013-06-25 Passive shutdown sealing device for a system of shaft seals of a primary motorised pump unit

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US (1) US20150192142A1 (en)
EP (1) EP2864676A1 (en)
JP (1) JP2015528896A (en)
KR (1) KR20150032300A (en)
CN (1) CN104620027A (en)
BR (1) BR112014032566A2 (en)
CA (1) CA2877212A1 (en)
FR (1) FR2992392B1 (en)
IN (1) IN2014DN11210A (en)
RU (1) RU2015102015A (en)
WO (1) WO2014001702A1 (en)
ZA (1) ZA201409510B (en)

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US20150192142A1 (en) 2015-07-09
CN104620027A (en) 2015-05-13
BR112014032566A2 (en) 2017-06-27
RU2015102015A (en) 2016-08-20
FR2992392A1 (en) 2013-12-27
FR2992392B1 (en) 2014-07-11
ZA201409510B (en) 2016-09-28
KR20150032300A (en) 2015-03-25
JP2015528896A (en) 2015-10-01
IN2014DN11210A (en) 2015-10-02
EP2864676A1 (en) 2015-04-29
CA2877212A1 (en) 2014-01-03

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