CN102867555B - Detector and include the fuel rod oxide thickness measurement apparatus of this detector - Google Patents
Detector and include the fuel rod oxide thickness measurement apparatus of this detector Download PDFInfo
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- CN102867555B CN102867555B CN201110243780.9A CN201110243780A CN102867555B CN 102867555 B CN102867555 B CN 102867555B CN 201110243780 A CN201110243780 A CN 201110243780A CN 102867555 B CN102867555 B CN 102867555B
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- fuel rod
- detector
- fuel
- transit area
- involucrum
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- 239000000446 fuel Substances 0.000 title claims abstract description 164
- 238000005259 measurement Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000003758 nuclear fuel Substances 0.000 description 10
- 238000005253 cladding Methods 0.000 description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention provides one to be disintegrated by fuel stringer assembly, the detector that can detect the involucrum of the involucrum of fuel stringer assembly inner fuel rod with outermost fuel rod and fuel rod oxide thickness measurement apparatus.The detector of the present invention provided includes that fuel rod transit area, described fuel rod transit area are mounted with the eddy current sensor detected fuel stringer assembly outermost fuel rod clad continuously while moving up and down.Additionally, fuel rod oxide thickness measurement apparatus provided by the present invention includes: inside comprises the support of the cylinder that can be driven along the vertical direction；The detector being connected with described cylinder side for detecting the involucrum of fuel stringer assembly outermost fuel rod；And for detecting the involucrum of fuel stringer assembly inner fuel rod and the second detector of being connected with described cylinder opposite side.
Description
Technical field
The present invention relates to the use of eddy current sensor and measure the upper formation of fuel rod clad (cladding) of nuclear fuel element
The device of oxide thickness, in more detail, relate to a kind of on the device of oxide thickness measuring fuel rod, possessing can edge
The instrument up and down, being around driven, and include the detector for detecting the excellent involucrum of fuel stringer assembly inner fuel
Device with the detector of the involucrum for detecting outermost fuel rod.
Background technology
During nuclear reactor operating, the nuclear fuel rod of configuration on each nuclear fuel assembly is immersed and is positioned at nuclear reactor core
In coolant/moderator.In the light-water reactor of the zirconium or zirconium alloy cladding pipe that use nuclear fuel rod, owing to using water
The reaction between zirconium in coolant/moderator and cladding tubes, gathers to about 100 μm the Zirconium oxide of thickness and is formed at
On nuclear fuel rod.Carry out during conduction of heat from fuel rod clad pipe to coolant/moderator, due to the inverse work of Zirconium oxide
With and cause the metal loss of damage in terms of containment structure integrity so that the thickness of involucrum wall is more and more thinner, respectively
There is restriction in the maximum of the oxide allowed on fuel rod.Once reach this limit value, then must refuelling rod.
Therefore, the thickness measure of oxide layer for nuclear fuel rod hot hydraulic pressure performance, fuel rod operating limit supposition
And the correct evaluation of fuel rod life span is extremely important.
Measurement generally for fuel rod oxide thickness uses vortex flow detection method, for the survey that fuel rod is the most damaged
Amount uses ultrasound detection.
By vortex flow detection method, the example of the prior art measuring fuel rod oxide thickness has, and Korean granted is practical
" the command bundle rods for nuclear reactors eddy current inspection platform of nuclear fuel rod " of novel publication the 20-0339313rd, KR published patent are public
Report " for the nuclear fuel rod transporter of eddy current inspection detection " and the Korean granted patent of No. 10-2004-0012065
" measuring method of the oxide thickness that ferromagnetic substance is formed below on nuclear fuel rod " of publication the 10-0735213rd etc..
The vortex flow detection method that above-mentioned prior art is provided, it is necessary to fuel stringer assembly is disintegrated, and to the combustion after disintegrating
Charge bar detects one by one, it is therefore desirable to the substantial amounts of time, exists and cannot examine fuel rod oxide-film efficiently
The shortcoming surveyed.
Summary of the invention
(1) to solve the technical problem that
For solving above-mentioned problem of the prior art, present invention aim at providing a kind of detector, this detector need not be by
Fuel stringer assembly disintegrates, can be while moving up and down along its length, continuously to fuel stringer assembly outermost fuel rod
Involucrum detect.
Additionally, another object of the present invention is to, it is provided that a kind of fuel rod oxide thickness measurement apparatus, it includes, nothing
Fuel stringer assembly must be disintegrated, can be to the detector that detect of involucrum of fuel stringer assembly inner fuel rod and to outermost
The involucrum of fuel rod carries out the detector detected.
(2) technical scheme
In order to achieve the above object, the detector of the present invention includes eddy current sensor and fuel rod transit area, upper
Continuously the involucrum of fuel stringer assembly outermost fuel rod can be detected while lower movement.
Described detector possesses the multiple transit areas forming semi-circular groove along its length, it is characterised in that may make up
It is to include: the fuel rod transit area that is provided with eddy current sensor, the transmission being positioned at described fuel rod transit area top rolling
Axle and be positioned at the transmission supporting zone of described fuel rod transit area both sides；Described detector passes through while moving up and down
The involucrum of the fuel stringer assembly outermost fuel rod that eddy current sensor detection is fixed.
Further, the fuel rod oxide thickness measurement apparatus of the present invention includes: inside comprises can drive along the vertical direction
The support of dynamic cylinder, the spy being connected with described cylinder side to detect the involucrum of fuel stringer assembly outermost fuel rod
The second detection surveying device and be connected with described cylinder opposite side to detect the involucrum of fuel stringer assembly inner fuel rod
Device.
Described detector, it is characterised in that while moving along the vertical direction, continuous by eddy current sensor
The involucrum of the fuel stringer assembly outermost fuel rod that ground detection is fixed.
Described second detector, it is characterised in that it may be configured as loading at the end of the plate-shaped possessing specific length
Having eddy current sensor, described second detector is while moving along the longitudinal direction, continuous by eddy current sensor
The involucrum of the fuel stringer assembly inner fuel rod that ground detection is fixed.
(3) beneficial effect
According to the invention described above, it is provided that having can be while moving along the vertical direction, continuously in operating
The involucrum of fixed fuel stringer assembly outermost fuel rod carries out the detector detected, thus possesses and can not fire in outermost
The specified point (point) of charge bar and the effect that on the whole the oxide-film state of fuel rod detected.
Fuel stringer assembly in operating need not be disintegrated additionally, the present invention provides, fuel stringer assembly outermost can be fired
The involucrum of the involucrum of charge bar and inner fuel rod carries out the fuel rod oxide thickness measurement apparatus that detects simultaneously, thus possess can
With rapidly and there is the effect efficient measured fuel rod oxide-film.
Accompanying drawing explanation
Fig. 1 a is the axonometric chart showing detector used in the present invention.
Fig. 1 b is the one side figure showing detector used in the present invention.
Fig. 2 is the axonometric chart of the fuel rod oxide thickness measurement apparatus showing the present invention.
Fig. 3 is the axonometric chart showing measurement portion used in the present invention.
Fig. 4 is the axonometric chart showing the second detector used in the present invention.
Fig. 5 is the axonometric chart of left and right used in the present invention transport unit.
Fig. 6 is the axonometric chart of transport unit front and back used in the present invention.
Description of reference numerals:
1: fuel rod oxide thickness measurement apparatus
100: measurement portion 200: left and right transport unit
300: transport unit 400 front and back: support platform
110: support 120: cylinder
130: detector 140: the second detector
150: lower plate 131: eddy current sensor
132: fuel rod transit area 133: transmit roller bearing
134: transmission supporting zone 135: side supports support
136: lower plate 141: thin plate
142: eddy current sensor 143: lower plate
210: guide rail 220: lower plate
230: the parts that can move along guide rail
310: guide rail 320: lower plate
Detailed description of the invention
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.First, on the structure member of each accompanying drawing
Being attached to reference marker, for identical structure member, even being shown in different accompanying drawings, using identical the most as far as possible
Labelling.During additionally, the present invention will be described below, if relevant the illustrating of relevant common knowledge or structure is recognized
For idea of the invention and need not can be obscured, then omit this detailed description.
The nuclear fuel of nuclear reactor internal arrangement is constituted in units of fuel stringer assembly, fuel stringer assembly by
Tens of or hundreds of fuel rods are constituted.Further, a fuel rod is, is closed by the thin zirconium of the uranium 1mm thickness in units of granule
Gold cladding tubes covers, and to protected from from outside damage, and prevents the structure that radiant leaks.Fuel rod a diameter of
About 9.5mm, is spaced apart about 3.3mm between fuel rod and fuel rod.
As shown in Figures 1 to 6, the detector 130 of the present invention by eddy current sensor 131, fuel rod transit area 132,
Transmit roller bearing 133, transmission supporting zone 134, side supports support 135 and lower plate 136 to constitute.
Further, the fuel rod oxide thickness measurement apparatus 1 of the present invention mainly by measurement portion 100, left and right transport unit 200,
Front and back transport unit 300 and support platform 400 are constituted.
As shown in Fig. 1 a and Fig. 1 b, described detector 130 is as the part of measurement fuel rod oxide-film, and contact is as detection
The involucrum of the fuel rod of object is also mounted with eddy current sensor 131.Described eddy current sensor 131 is measured and is produced from fuel rod
The amount of vortex flow measure the thickness of oxide-film.
If more specifically checking, the fuel rod transit area 132 being formed with semi-circular groove is in middle position, this semicircle
Shape groove has the length of regulation in the longitudinal direction, fills on the upper position that fuel rod transit area 132 length direction extends
It is loaded with transmission roller bearing 133.
Being each provided with one in described fuel rod transit area 132 both sides and transmit supporting zone 134, it has in length side
Upwards longer than fuel rod transit area semi-circular groove.Further, the part measuring described fuel rod oxide-film is fixed on connection
On the support support 135 in measurement portion, the lower plate 136 that side supports support 135 relies on its bottom surface to connect is fixed.
That is, the lower plate 136 of described detector 130 connects the side (as it is shown on figure 3, being connected to left side) of cylinder 120, loads
The fuel rod transit area 132 having eddy current sensor 131 touches the fuel rod as detection object.
Now, cylinder 120 is driven with fuel stringer assembly outermost fuel rod with paralleling along the vertical direction, by visiting
Survey the eddy current sensor 131 being loaded on fuel rod transit area 132 of device 130, outermost fuel can be measured continuously
The oxide-film state that rod is overall.
Transmit roller bearing 133 and be arranged at the top extended along described fuel rod transit area 132 length direction, and touch work
For the fuel rod of oxide-film detection object, it is positioned at the transmission supporting zone 134 of fuel rod transit area 132 both sides and is positioned at oxidation
Each fuel rod about film detection object fuel rod contacts, thus connects cylinder 120 along the vertical direction at detector 130
While being driven, during the involucrum of fuel stringer assembly outermost fuel rod is detected, transmit supporting zone 134
Play the guiding function without departing from route.
Described measurement portion 100 is as being mounted with for detecting fuel stringer assembly outermost fuel rod and the bag of inner fuel rod
The part of the detector of shell, such as the content illustrated in detail in Fig. 3, it is comprised the vapour that can be driven along the vertical direction by inside
The support 110 of cylinder 120, connected by lower plate 136 described cylinder 120 side detector 130, connected by lower plate 143 described
Second detector 140 of cylinder 120 opposite side and the lower plate 150 of fixing described support 110 are constituted.
As shown in Figure 4, second detector 140 end on thin plate 141 length direction is mounted with eddy current sensor
142, and include the lower plate 143 supported.
If more specifically checking, the lower plate 143 of the second detector 140 connect described cylinder 120 opposite side (in Fig. 3,
It is connected to right side), described measurement portion 100 can carry out the driving on fore-and-aft direction along the guide rail 310 of front and back's transport unit 300.
That is, adjacent with fuel stringer assembly position arranges the fuel rod oxide thickness measurement apparatus 1 of the application, depends on
By described transport unit 300 front and back by the thin plate 141 being mounted with eddy current sensor 142 of described second detector 140 along length
Direction is inserted between fuel rod and fuel rod.
Now, eddy current sensor 142 measures the amount of the vortex flow produced from fuel rod with fuel rod while contacting, from
And the oxide-film state at fuel rod specified point can be measured.
Further, thin plate 141 has certain length, and before and after being configured to rely on, transport unit 300 can be driven along the longitudinal direction
Dynamic, when relying on described transport unit 300 traverse measurement portion 100 along the longitudinal direction front and back, it is mounted with the thin of eddy current sensor 142
While plate 141 is inserted into fuel stringer assembly inside, the oxide-film state of fuel stringer assembly inner fuel rod can be detected.
Described left and right transport unit 200 possesses two tubular guide rails 210, with support together with platform 220 along right and left
To being driven, the parts 230 being formed with semi-circular groove are loaded on the bottom surface supporting platform 220, front and back transmit along being arranged at
Guide rail 310 in portion 300 can carry out the driving on fore-and-aft direction.
If more specifically checking, the position adjacent with fuel stringer assembly arranges the fuel rod thickness of oxidation film of the application
Degree measurement apparatus 1.In the case of relying on the overall oxide-film measuring outermost fuel rod of described detector 130, pass about dependence
Send portion 200 to position measurement portion 100 so that fuel rod transit area 132 and transmit supporting zone 134 orientate as with as detection
The fuel rod of object and to be positioned at the fuel rod of this fuel rod right position parallel.
Additionally, in the case of relying on the second detector 140 to measure the oxide-film of inner fuel rod, can be to the second detection
Device 140 positions, and makes the thin plate 141 possessing specific length being mounted with eddy current sensor 142 may be inserted into fuel rod
And between fuel rod.
Before and after described, transport unit 300 possesses two tubular guide rails 310, the support platform of described left and right transport unit 200
The parts 230 being formed with semi-circular groove that 220 bottom surfaces load can carry out front and back along the guide rail 310 of front and back's transport unit 300
Driving upwards.
If more specifically checking, detect fuel rod group by the second detector 140 loaded in described measurement portion 100
In the case of the involucrum of part inner fuel rod, described left and right transport unit 200 is relied on to will be loaded with the thin plate of eddy current sensor 142
141 orientate as and may be inserted between fuel rod and fuel rod, then rely on described before and after transport unit 300 will be loaded with vortex flow and pass
While the thin plate 141 of sensor 142 inserts between fuel rod, the inner fuel rod contacted with eddy current sensor 142 can be measured
Specified point at the amount of vortex flow that produces measure the thickness of oxide-film.
On the other hand, rely on the measurement that oxide thickness is carried out by eddy current sensor, be to eddy current sensor stream
When entering alternating current, can produce magnetic field around sensor, this magnetic field can produce vortex flow (eddy current) at fuel rod surface.
Can be distorted when this vortex flow exists certain flaw on fuel rod surface, the amount of the electric current measuring this distortion can know combustion
The defect state on charge bar surface or size, although by not having defect to conduct at fuel rod surface when measuring oxide thickness
Vortex flow do not produce distortion, but owing to oxide-film is non-conductor, thus oxide thickness is the thickest, then the whirlpool electricity of induction on surface
The value of stream is the lowest.Here it is lift-off (Lift-Off), the value measuring this lift-off can measure the involucrum overlying of fuel rod
The thickness of the oxide-film of lid.
Above, the specific part of present invention is described in detail, for knowing the people of industry common knowledge
For Yuan, such concrete technology is the most preferred embodiment, it will be apparent that, it is impossible to come the present invention according to this content
Protection domain be defined.Therefore, the actual protection domain of the present invention should be determined by claims and equivalents thereof
Justice.
Claims (7)
1. a detector, it is characterised in that described detector (130) includes eddy current sensor (131) and fuel rod transmission
Region (132), the involucrum of fuel stringer assembly outermost fuel rod is carried out while moving up and down by described detector continuously
Detection, wherein, fuel rod transit area (132) is formed with semi-circular groove, and described detector also includes transmitting supporting zone
(134), it has semi-circular groove more longer than fuel rod transit area (132) in the longitudinal direction, and examines with being positioned at oxide-film
Surveying each fuel rod about object fuel rod to contact, without departing from circuit when guiding detector to drive up and down, described transmission is propped up
Support region (134) is arranged on the both sides of described fuel rod transit area (132), during described fuel rod transit area (132) is in
Position, centre.
2. detector as claimed in claim 1, it is characterised in that described detector (130) including:
It is mounted with the fuel rod transit area (132) of eddy current sensor (131)；
It is positioned at the transmission roller bearing (133) on described fuel rod transit area (132) top；And
It is positioned at the transmission supporting zone (134) of described fuel rod transit area (132) both sides.
3. detector as claimed in claim 1, it is characterised in that described detector (130) possesses formation half along its length
The transit area of circular trough,
In order to contact with outermost fuel rod surface, it is mounted with the fuel rod transit area (132) of eddy current sensor (131)
Being in middle position, possessing on the upper position that fuel rod transit area (132) length direction extends has transmission roller bearing
(133), be positioned at fuel rod transit area (132) both sides include transmit supporting zone (134).
4. a fuel rod oxide thickness measurement apparatus, it is characterised in that described fuel rod oxide thickness measurement apparatus bag
Include:
Inside comprises the support (110) of the cylinder (120) that can be driven along the vertical direction；
The first detection being connected with described cylinder (120) side to detect the involucrum of fuel stringer assembly outermost fuel rod
Device (130)；And
The second detection being connected with described cylinder (120) opposite side to detect the involucrum of fuel stringer assembly inner fuel rod
Device (140),
Wherein, described first detector includes: fuel rod transit area (132), it is formed with semi-circular groove；Transmit supporting zone
(134), it has semi-circular groove more longer than fuel rod transit area (132) in the longitudinal direction, and examines with being positioned at oxide-film
Survey each fuel rod about object fuel rod to contact, without departing from circuit when guiding the first detector to drive up and down, described biography
Supporting zone (134) is sent to be arranged on the both sides of described fuel rod transit area (132), described fuel rod transit area (132) place
In middle position.
5. fuel rod oxide thickness measurement apparatus as claimed in claim 4, it is characterised in that described first detector
(130) while moving along the vertical direction, fixed fuel rod is detected continuously by eddy current sensor (131)
The involucrum of assembly outermost fuel rod.
6. fuel rod oxide thickness measurement apparatus as claimed in claim 4, it is characterised in that described second detector
(140) thin plate (141) and eddy current sensor (142) are included.
7. fuel rod oxide thickness measurement apparatus as claimed in claim 6, it is characterised in that described second detector
(140) while moving along the longitudinal direction, fixed fuel rod is detected continuously by eddy current sensor (142)
The involucrum of component internal fuel rod.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110067727A KR101200781B1 (en) | 2011-07-08 | 2011-07-08 | Probe and apparatus for measuring oxide layer thickness of nuclear fuel assembly containing the same |
| KR10-2011-0067727 | 2011-07-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102867555A CN102867555A (en) | 2013-01-09 |
| CN102867555B true CN102867555B (en) | 2016-12-14 |
Family
ID=
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0170341A1 (en) * | 1984-07-31 | 1986-02-05 | Kett Electric Laboratory | Instrument for measuring film thickness |
| US5124641A (en) * | 1989-12-27 | 1992-06-23 | Framatome | Eddy current probe method and device for simultaneously measuring the distance between metal tubes and oxide thickness on the tubes |
| JPH05232286A (en) * | 1992-02-18 | 1993-09-07 | Nuclear Fuel Ind Ltd | Measuring apparatus of dimensions of channel box |
| USH1262H (en) * | 1991-10-02 | 1993-12-07 | The United States Of America As Represented By The United States Department Of Energy | Rod examination gauge |
| JPH07218474A (en) * | 1994-02-08 | 1995-08-18 | Hitachi Ltd | Underwater eddy current tester |
| CN1232541A (en) * | 1996-09-30 | 1999-10-20 | 弗拉马托梅股份公司 | Method and device for measuring deformation of guide tube |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0170341A1 (en) * | 1984-07-31 | 1986-02-05 | Kett Electric Laboratory | Instrument for measuring film thickness |
| US5124641A (en) * | 1989-12-27 | 1992-06-23 | Framatome | Eddy current probe method and device for simultaneously measuring the distance between metal tubes and oxide thickness on the tubes |
| USH1262H (en) * | 1991-10-02 | 1993-12-07 | The United States Of America As Represented By The United States Department Of Energy | Rod examination gauge |
| JPH05232286A (en) * | 1992-02-18 | 1993-09-07 | Nuclear Fuel Ind Ltd | Measuring apparatus of dimensions of channel box |
| JPH07218474A (en) * | 1994-02-08 | 1995-08-18 | Hitachi Ltd | Underwater eddy current tester |
| CN1232541A (en) * | 1996-09-30 | 1999-10-20 | 弗拉马托梅股份公司 | Method and device for measuring deformation of guide tube |
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