DE2914872A1 - Molten core catch vat - for pressurised water reactor made or uranium oxide with cooled bottom - Google Patents

Molten core catch vat - for pressurised water reactor made or uranium oxide with cooled bottom

Info

Publication number
DE2914872A1
DE2914872A1 DE19792914872 DE2914872A DE2914872A1 DE 2914872 A1 DE2914872 A1 DE 2914872A1 DE 19792914872 DE19792914872 DE 19792914872 DE 2914872 A DE2914872 A DE 2914872A DE 2914872 A1 DE2914872 A1 DE 2914872A1
Authority
DE
Germany
Prior art keywords
vat
core
uranium oxide
pressurised water
water reactor
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
DE19792914872
Other languages
German (de)
Inventor
Erich Prof Dr Bagge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19792914872 priority Critical patent/DE2914872A1/en
Publication of DE2914872A1 publication Critical patent/DE2914872A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C9/00—Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices
    • G21C9/016—Core catchers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Abstract

There is a risk of a core melting in pressurised water reactors if the prim. cooling circuit or its pumps fail. Fuel element can metal mixt. may drop on the tank and fuse it. It is suggested therefore to arrange a vat below the reactor core but within the pressure vessel and to make it of natural or depleted uranium oxide. Bottom of the vat is designed with a honeycomb structure to which an independent and additional cooling system can be applied for the dissipation of the heat. Material of the vat has pref. an admixture of neutron absorbers. This safeguards the personnel against the risk of a molten core.

Description

Auffangwanne bei der Coreschmeize von DruckwasserreaktorenCollecting basin in the core melting of pressurized water reactors

Beim Betrieb von Druckwasserreaktoren besteht die Gefahr der Coreschmelze wenn bei einem Rohrbruch im Primärkreislauf oder beim Ausfall von Xühlmittelpumpe irgendwelcher Art (Speisewasserpumpen, Pumpen für die Notkühlung, Pumpen der KUhikreise) des gesamten Primärsystems der Reaktorkern vorübergehend oder dauernd nicht voll von Wasser bedeckt ist oder zumindest von Wasser der Notkuhlung bespült wird.When operating pressurized water reactors, there is a risk of core melting if there is a broken pipe in the primary circuit or if the coolant pump fails of any kind (feed water pumps, pumps for emergency cooling, pumps for the KUhi circuits) of the entire primary system of the reactor core temporarily or permanently not full covered by water or at least flushed with emergency cooling water.

Im schlimmsten Fall ist damit zu rechnen, dass das flüssige Brennstoff-Hüllenmetallgemisch auf den Boden des Reaktordruckbehälters sinkt oder fällt und diesen infolge seiner hohen Temperatur in Verbindung mit seiner hohen Dichte nach unten durchschmilzt.In the worst case, it is to be expected that the liquid fuel-cladding metal mixture sinks or falls to the bottom of the reactor pressure vessel and this as a result of it high temperature combined with its high density.

Un dieser Gefahr zu begegnen , wird erfindungsgemäß vorgeschlagen unterhalb des Reaktorkernes , aber noch innerhalb des Druckkessels, eine aus des Oxid des natürlichen oder depletierten Urans , das noch mit guten Neutronenabsorbern vermischt oder durchsetzt sein kann , eine Wanne einzubauen , die die Coreschmelze auffängt. Diese Auffangwanne soll dabei so gestaltet werden , dass sie durch ein vom übrigen Kühlsystem getrenntes System gekühlt werden kann. Durch ihr hohes spezifisches Eigengewicht einerseits und durch cie unabhängige Kühl einrichtung andererseits soll verhindert werden ,dass diese Wanne vom herabtropfenden Core durchschnolzen werden kann. Unter diesen Umständen wird die Coreschrrelze in der Wanne schwimmen . Ausserdem wird die in ihr freiwerdende Wärmeenergie bei geeigneter Dimensionierung des für die Auffangwanne vorgesehenen Rühlkreislaufs laufend abgeführt werden können.To counter this danger is proposed according to the invention below the reactor core, but still inside the pressure vessel, one from the Oxide of natural or depleted uranium that still has good neutron absorbers can be mixed or interspersed to build a tub that melts the core catches. This drip pan should be designed in such a way that it is through a system separated from the rest of the cooling system can be cooled. By their high specificity Dead weight on the one hand and due to the independent cooling device on the other to prevent this tub from melting through from the dripping core can be. Under these circumstances, the core will float in the tub . In addition, the heat energy released in it, if dimensioned appropriately of the cooling circuit provided for the drip pan can be continuously removed.

Die Wanne wird dabei zweckmaßigerweise keinen glatten oder monoton gekriimmten Boden erhalten,sondern wabenförmig zu gestalten sein , damit das herabtropfende Core sich nicht zu einem nukleartechnisch überkritischen CHbilde zusaitnnfinden kann.The tub is expediently not smooth or monotonous Keep the curved bottom, but rather be honeycomb-shaped so that the dripping down Core do not come together in a nuclear supercritical CH formation can.

Die aus u.U. mehreren Teilen zusammengesetzte Wanne nuß selbst ein Hüllenmaterial tragen, das einen möglichst hohen Schelzpunkt besitzt. (z.B.The tub, which may be composed of several parts, must be installed by itself Wear cover material that has the highest possible felling point. (e.g.

Nickel,evtl.legiert mit weiteren Neutronenabsorbern) und natürlich dem korrosiven Angriff des unter hoherr Druck stehenden,heißen Kühl-und Moderatorwassers des Reaktors standhält.Nickel, possibly alloyed with other neutron absorbers) and of course the corrosive attack of the hot Cold and Withstands moderator water of the reactor.

Die Menge des für den Aufbau der Auffangwanne eingesetzten Uranoxids muss der des Reaktorkernes vergleichbar sein.The amount of uranium oxide used to build the sump must be comparable to that of the reactor core.

Claims (1)

P a t e n t a n s p r ü c h e P a t e n t a n s p r u c h 1. P a t e n t a n s p r ü c h e P a t e n t a n s p r u c h 1. Vorrichtung zum Auffangen des @erabtropfenden Brennstoff-Metallgemisches bei einer Coreschmelze eines Druckwasserreaktors dadurch gekennzeichnet , daß unterhalb des Reaktorkernes , aber noch innerhalb des Druckgefäßes eine aus natürlichem oder depletierten Uranoxid gebildete Auffangwanne mit einer Wabenstruktur inihrer Bodenfläche eingesetzt wird , die mit einem unabhängigen und zusätzlichen Kuhlsystem zur Wärmeabfuhr ausgestattet ist.Device for collecting the dripping fuel-metal mixture in the case of a core melt of a pressurized water reactor, characterized in that below of the reactor core, but still within the pressure vessel one made of natural or Depleted uranium oxide drip pan with a honeycomb structure in its bottom surface is used with an independent and additional cooling system for heat dissipation Is provided. Patentanspruch 2.Claim 2. Vorrichtung nach Anspruch 1 dadurch gekennzeichnet , daß die Wanne in ein Hüllenmaterial eingebettet ist , das unter normalen Reaktorbetriebsbedingungen gegen das Erimirwasser korrosionsfest ist.Device according to Claim 1, characterized in that the tub is embedded in a shell material, which under normal reactor operating conditions against which Erimir water is corrosion-resistant. Patentanspruch 3.Claim 3. Vorrichtung nach den Ansprüchen 1 und 2 dadurch gekennzeichnet , daß das Wannenmaterial mit Neutronenabsorbern vermischt oder durchsetzt ist.Device according to claims 1 and 2, characterized in that the tub material is mixed or interspersed with neutron absorbers.
DE19792914872 1979-04-12 1979-04-12 Molten core catch vat - for pressurised water reactor made or uranium oxide with cooled bottom Withdrawn DE2914872A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792914872 DE2914872A1 (en) 1979-04-12 1979-04-12 Molten core catch vat - for pressurised water reactor made or uranium oxide with cooled bottom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792914872 DE2914872A1 (en) 1979-04-12 1979-04-12 Molten core catch vat - for pressurised water reactor made or uranium oxide with cooled bottom

Publications (1)

Publication Number Publication Date
DE2914872A1 true DE2914872A1 (en) 1980-10-23

Family

ID=6068174

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19792914872 Withdrawn DE2914872A1 (en) 1979-04-12 1979-04-12 Molten core catch vat - for pressurised water reactor made or uranium oxide with cooled bottom

Country Status (1)

Country Link
DE (1) DE2914872A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0993000A2 (en) * 1998-10-07 2000-04-12 Forschungszentrum Jülich Gmbh Apparatus for cooling and protecting a reactor pressure vessel in the event of a core melting accident
FR2784785A1 (en) * 1998-10-14 2000-04-21 Commissariat Energie Atomique NUCLEAR WATER REACTOR HAVING A RECEPTACLE CONTAINING DEFORMABLE INTERNAL STRUCTURES

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0993000A2 (en) * 1998-10-07 2000-04-12 Forschungszentrum Jülich Gmbh Apparatus for cooling and protecting a reactor pressure vessel in the event of a core melting accident
EP0993000A3 (en) * 1998-10-07 2000-12-13 Forschungszentrum Jülich Gmbh Apparatus for cooling and protecting a reactor pressure vessel in the event of a core melting accident
FR2784785A1 (en) * 1998-10-14 2000-04-21 Commissariat Energie Atomique NUCLEAR WATER REACTOR HAVING A RECEPTACLE CONTAINING DEFORMABLE INTERNAL STRUCTURES

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8139 Disposal/non-payment of the annual fee