CN101090008B - Failed fuel assemblies repair technology after irradiation - Google Patents
Failed fuel assemblies repair technology after irradiation Download PDFInfo
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- CN101090008B CN101090008B CN2006100875988A CN200610087598A CN101090008B CN 101090008 B CN101090008 B CN 101090008B CN 2006100875988 A CN2006100875988 A CN 2006100875988A CN 200610087598 A CN200610087598 A CN 200610087598A CN 101090008 B CN101090008 B CN 101090008B
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- 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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Abstract
This invention provides a repairing technology for radiated damaged fuel components and its special equipment, which utilizes the current correction method for tilting baskets, the restoration correction device of 2-D pilot vanes and check to special location lattice correction gauge to correct the location lattices of slight damage of boarding and distortion and warp of few pilot vanes, and applies a method for exchanging positions of fuel bars in step for the framework replacement of heavily damaged boarding to expand the original bar replacement and repairing function and guarantees that old and new components will not be distorted because of no-bar framework.
Description
Technical field
What the present invention relates to damaged fuel assembly behind the PWR nuclear power plant irradiation changes the replacing after rod, restorative procedure and instrument, particularly fuel rod, the damage of grid spacer coaming plate, a kind of burst slug assembly repair technology after irridiation of reparation.
Background technology
Nuclear power plant reloads in the process, sometimes find that multiplexing fuel rod breakage and spacer grid of fuel assembly coaming plate have injury event in various degree, damaged security, economy, refuelling scheme and the overhaul duration of reloading to power plant's operation of fuel assembly appearance all produces significant impact behind the irradiation.The damaged leakage of fuel rod can cause radioactive fission product to leak in the circuit cools agent, cause the increase and the staff of system's radioactive level to accept unnecessary radiation dose, damaged fuel assembly considers that the risk control of security of operation does not allow to go into again stack operation in principle.The local slight damage of spacer grid of fuel assembly coaming plate is meant the local slight damage of the peripheral coaming plate of screen work behind the irradiation, outer the sticking up of indivedual guide vane distortion.The local slight damage of grid spacer coaming plate, the outer fuel assembly that sticks up of guide vane distortion are in loading and unloading material process, be easy to block, scrape, draw with the generation of adjacent fuel assembly, cause the mutual hook damage of adjacent fuel assembly, make the loading and unloading material that greatly difficulty take place, and be in operation and also may cause damage the grid spacer of adjacent fuel assembly, threaten the safe operation of fuel assembly, therefore, the local slight damage of grid spacer coaming plate, the outer assembly that sticks up of guide vane distortion could use after must proofreading and correct.Spacer grid of fuel assembly coaming plate major injury is meant that the screen work coaming plate seriously tears, sticks up and the guide vane gross distortion outward behind the irradiation, greatly difficulty takes place except making the loading and unloading material in this major injury, also cause fuel list rod that wear phenomenon takes place in the middle of operation easily, if these assemblies are not handled, in view of the consideration of safety will not allow back heap multiplexing.
If fuel rod the fuel assembly damaged and damage of grid spacer coaming plate is not repaired and is handled behind the irradiation, one group is only moved the breakage of a round-robin fuel assembly, will directly cause 2,400,000 yuan of about 2,000,000 yuan assets economic loss and corresponding increase spentnuclear fuel aftertreatment expenses.Because desired 1/4, the 1/8 symmetrical requirement of refuelling scheme, one group fuel assembly is unavailable will to cause other three group fuel assemblies on the reactor core symmetric position can't go into the heap use, this not only will cause the significant wastage of fuel, and balance is reloaded, the refuelling scheme and the scheme optimization of several cycles reactor core from now on but also can influence.In addition, interim start the calculating of emergent refuelling scheme and check need nearly one month, this reloads prolongation duration of overhaul, economic loss will be very huge.
For fuel assembly behind the dismountable irradiation of bottom nozzle, the basic procedure that changes excellent renovation technique of burst slug rod is: sob fuel assembly → breakage fuel assembly to be repaiied of inhale to check confirming the fuel rod breakage tumble 180 ° → pull down base → fuel rod take out excellent eddy current test → replacings burst slug rod → load base → assembly tumble 180 ° → sob inhale check qualified → return and pile.Its system equipment is mainly pressed from both sides flat instrument, useless excellent hold-up vessel, additional reservoir, location-plate, is gone up lower platform etc. and form by tumble basket and tiltable frame, bottom nozzle gripping tool, set nut anchor clamps, set nut of fuel rod replacing device, eddy detection system, fuel assembly, as shown in Figure 2.Fuel rod replacing device is used to take out rod to carry out eddy current inspection and changes damaged single rod, this device has been set the limit value of the power that pulls and pushes, can guarantee can not pull fuel rod taking out rod automatically, eddy detection system is used for fuel rod eddy current test, tumble basket and tiltable frame of fuel assembly is used for fuel assembly is tumbled 180 °, the bottom nozzle gripping tool is used for the bottom nozzle of the fuel assembly after tumbling is unloaded and loads onto, set nut anchor clamps and set nut press from both sides set nut and the folder jam nut that flat instrument is respectively applied for the dismounting bottom nozzle, useless excellent hold-up vessel is used to store the burst slug rod, additional reservoir is used for storing the demarcation rod, location-plate is used for the fuel rod that will extract is positioned, and last lower platform is mainly used in the container of tumbling that hangs up the band assembly after 180 ° of tumbling.
In the basic procedure of this renovation technique: do not consider that the reparation of the local slight damage of spacer grid of fuel assembly coaming plate behind the irradiation and the skeleton behind the grid spacer coaming plate major injury change problem, and also there is incomplete aspect in the renovation technique flow process, as: do not carry out the underwater television visual examination before the breakage component reparation and confirm whether this assembly possesses repairing condition, after breakage component changes the rod reparation, only sob the suction leak test, do not carry out the underwater television visual examination, particularly shortage distortion inspection means are estimated the distortion situation of reparation back assembly etc.
In addition, adopt reflective mirror and telescope to come undersea surveillance and affirmation operation when repairing operation, this inconvenient operation, underwater observation neither be very clear, and underwater operation monitors and affirmation means deficiency; The MIZ-7 eddy current instrument of eddy detection system can not carry out stored record to the Lissajous figure of flaw indication, can only lean on the curve of paper feed registering instrument tracer signal, signal can not playback, existence can not be carried out the shortcoming of stored record and analysis to flaw indication, checking defective must be through withdrawing fuel rod repeatedly, so not only waste time and energy, and probably the rigid projection of fuel list rod and grid spacer is caused damage, very risky.
Summary of the invention
The correction and the skeleton behind the grid spacer coaming plate major injury that the object of the present invention is to provide fuel assembly behind a kind of irradiation to change rod reparation, the local slight deformation damage of grid spacer coaming plate are changed at interior burst slug assembly repair technology after irridiation.
Realize the technical scheme of the object of the invention: a kind of burst slug assembly repair technology after irridiation may further comprise the steps:
(1) sob the fuel assembly of inhaling the breakage of inspection affirmation fuel rod, the fuel assembly of grid spacer coaming plate damage is confirmed in the underwater television visual examination;
(2) when the fuel rod breakage, when the grid spacer coaming plate does not damage, breakage fuel assembly to be repaiied is tumbled 180 °, the dismounting bottom nozzle, carry out fuel rod and take out excellent eddy current test, replacing burst slug rod, the assembling bottom nozzle is tumbled 180 ° with the fuel assembly after repairing, sob and inhale check and the check of underwater television outward appearance, be up to the standards and then return the heap use;
(3) local when slight when fuel rod breakage, grid spacer coaming plate degree of injury, adopt the blue preliminary smoothing of tumbling, the two-dimensional guide wing prosthetic device that resets to proofread and correct, utilize the verification of grid spacer corrective gauge qualified after, enter step (2) flow process again;
(4) when the fuel rod breakage, when grid spacer coaming plate degree of injury is serious, breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair the fuel assembly from breakage and to extract 102 old rods out, carry out fuel rod simultaneously and take out excellent eddy current test, replacing burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the combustion assembly from breakage and pack in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, the disintegration breakage waits to repair the combustion assembly, and therefrom extracts remaining 102 old rods out, carries out fuel rod simultaneously and take out excellent eddy current test, changes the burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the combustion assembly from breakage and pack in this novel fuel assembly, extract 51 new rods again from novel fuel assembly out, will wait to repair 51 last old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; The assembling novel fuel assembly is tumbled 180 ° with novel fuel assembly, sobs and inhales check and the check of underwater television outward appearance, is up to the standards then to return to pile and uses;
(5) when fuel rod is damaged, grid spacer coaming plate degree of injury is local when slight, adopt the blue preliminary smoothing of tumbling, the two-dimensional guide wing prosthetic device that resets to proofread and correct, utilize the qualified back of grid spacer corrective gauge verification to return heap and use;
(6) damaged when fuel rod, when grid spacer coaming plate degree of injury is serious, breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair from breakage and extract 102 old rods the fuel assembly out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the fuel assembly from breakage packs in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the fuel assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, disintegration breakage fuel assembly to be repaiied, and therefrom extract remaining 102 old rods out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the fuel assembly from breakage and pack in this novel fuel assembly, extract 51 new rods from novel fuel assembly out, will wait to repair 51 last old rods of extracting out the fuel assembly from breakage and pack in the novel fuel assembly; The assembling novel fuel assembly is tumbled 180 ° with novel fuel assembly, sobs and inhales check and the check of underwater television outward appearance, is up to the standards then to return to pile and uses.
Effect of the present invention: the local slight damage reparation of (1) grid spacer coaming plate, the smoothing by utilizing the existing basket of tumbling and the two-dimensional guide wing the reset correction of prosthetic device and the verification of special-purpose grid spacer corrective gauge, can realize the treatment for correcting of the local slight damage of coaming plate, the outer grid spacer that sticks up of indivedual guide vane distortion, guaranteed the safety of the loading and unloading material of these assemblies effectively, used tool construction is fairly simple, easy to use, cost is very low; (2) skeleton behind the grid spacer coaming plate major injury is changed, expanded that existing fuel prosthetic appliance is original to change excellent repair function, made full use of the middle rotating function of spent fuel rod storage box, additional reservoir in the existing fuel prosthetic appliance, the method that the fuel rod that adopts replaces step by step can guarantee in the repair process new and old assembly not because of skeleton does not have rod deformation, the fresh fuel rod insert skeleton not because of around do not have fuel rod lattice cell to occur to scurry significant problems such as position; (3) increased before damaged fuel assembly is repaired and must confirm that its one-piece construction is complete through the content of underwater television visual examination, last bottom nozzle, skeleton and other parts do not have the functional distortion; (4) inhale the leakage check except that known sobbing after the assembly reparation, increased underwater television outward appearance check content, what particularly increased the evaluation component distortion carries out the interrod spacing inspection and the weight line directly spends the scope of examination to the fuel rod spacing, confirm that with this assembly one-piece construction is complete, fuel rod, skeleton and other parts N/D and obviously distortion, and the tool construction that is adopted is simple, easy to use, cost is very low; (5) change excellent recovery technique, screen work coaming plate injury repair and skeleton replacing technology after this cover improves, for power plant has retrieved direct economic loss and saved corresponding spentnuclear fuel aftertreatment expense, solved damaged fuel assembly to refuelling scheme and the influence of the overhaul duration of reloading.
Description of drawings
Fig. 1 is the process flow diagram of burst slug assembly repair technology after irridiation of the present invention.
Fig. 2 is the structural representation of damaged fuel assembly prosthetic device behind the existing irradiation.
Among the figure:
1. fuel rod replacing device, 2. eddy detection system, 3. tumble basket and tiltable frame, 4. bottom nozzle gripping tool, 5. set nut anchor clamps, 6. set nut presss from both sides flat instrument, 7. useless excellent hold-up vessel, 8. additional reservoir, 9. location-plate, 10. upper mounting plate, 11. lower platforms, 12. sob the suction box, 13. fuel assemblies to be checked;
Fig. 3 is the eddy detection system synoptic diagram.
Among the figure:
14. the eddy current instrument, 15.A/D conversion, 16. computing machines;
Fig. 4 is the fuel rod pedometer and checks synoptic diagram.
Among the figure:
17. the fuel rod pedometer, 18. carpenters squares, 19. connecting links;
Attach most importance to plumb line and check synoptic diagram of Fig. 5.
Among the figure:
20. the weight line, 21. weights, 22. cotton ropes;
Fig. 6 is the two-dimensional guide wing prosthetic device vertical view that resets.
Fig. 7 resets prosthetic device A-A to view for the two-dimensional guide wing.
Among the figure:
The prosthetic device 23. the two-dimensional guide wing resets, the outer guide vane that sticks up of 24. distortion, 25. gears, the drive link of 26. band tooth plates, 17. proofread and correct the jacking block that resets, 28. hangers, 29. frameworks, 30. bracing frames, 31. auxiliary stocks, 32. bearings, 33. axostylus axostyles, 34. cover plates, 35. side plates;
Fig. 8 is grid spacer corrective gauge and verification vertical view.
Fig. 9 is grid spacer corrective gauge and verification front view
Among the figure:
36. the grid spacer corrective gauge, 37. cylinder scales, 38. stocks;
Figure 10 is basket and the correction front view thereof of tumbling.
3. tumble basket and tiltable frame, 39. baskets of tumbling are suitable for reading.
Embodiment
Below in conjunction with drawings and Examples to the detailed description of the invention.
The process flow diagram of damaged fuel assembly restorative procedure behind the irradiation of the present invention, as shown in Figure 1, its technological process is:
(1) sob the fuel assembly of inhaling the breakage of inspection affirmation fuel rod, the fuel assembly of grid spacer coaming plate damage is confirmed in the underwater television visual examination;
(2) when the fuel rod breakage, when the grid spacer coaming plate does not damage, breakage assembly to be repaiied is tumbled 180 °, the dismounting bottom nozzle, carry out fuel rod and take out excellent eddy current test, replacing burst slug rod, the assembling bottom nozzle is tumbled 180 ° with the fuel assembly after repairing, sob and inhale check and the check of underwater television outward appearance, be up to the standards and then return the heap use;
(3) local when slight when fuel rod breakage, grid spacer coaming plate degree of injury, adopt the blue preliminary smoothing of tumbling, the two-dimensional guide wing prosthetic device that resets to proofread and correct, utilize the verification of grid spacer corrective gauge qualified after, enter step (2) flow process again;
(4) when the fuel rod breakage, when grid spacer coaming plate degree of injury is serious, breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair the fuel assembly from breakage and to extract 102 old rods out, carry out fuel rod simultaneously and take out excellent eddy current test, replacing burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the combustion assembly from breakage and pack in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, the disintegration breakage waits to repair the combustion assembly, and therefrom extracts remaining 102 old rods out, carries out fuel rod simultaneously and take out excellent eddy current test, changes the burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the combustion assembly from breakage and pack in this novel fuel assembly, extract 51 new rods again from novel fuel assembly out, will wait to repair 51 last old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; The assembling novel fuel assembly is tumbled 180 ° with novel fuel assembly, sobs and inhales check and the check of underwater television outward appearance, is up to the standards then to return to pile and uses;
(5) when fuel rod is damaged, grid spacer coaming plate degree of injury is local when slight, adopt the blue preliminary smoothing of tumbling, the two-dimensional guide wing prosthetic device that resets to proofread and correct, utilize the qualified back of grid spacer corrective gauge verification to return heap and use;
(6) damaged when fuel rod, when grid spacer coaming plate degree of injury is serious, breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair from breakage and extract 102 old rods the fuel assembly out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the combustion assembly from breakage and pack in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, the disintegration breakage waits to repair the combustion assembly, and therefrom extracts remaining 102 old rods out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the combustion assembly from breakage and pack in this novel fuel assembly, extract 51 new rods from novel fuel assembly out, will wait to repair 51 last old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; The assembling novel fuel assembly is tumbled 180 ° with novel fuel assembly, sobs and inhales check and the check of underwater television outward appearance, is up to the standards then to return to pile and uses.
The structural representation of damaged fuel assembly prosthetic device and specific purpose tool equipment behind the irradiation is shown in Fig. 2,3,4,5,6,7,8,9.Comprise that tumble basket and tiltable frame 3, bottom nozzle gripping tool 4, set nut anchor clamps 5, set nut of fuel rod replacing device 1, eddy detection system 2, fuel assembly presss from both sides flat instrument 6, useless excellent hold-up vessel 7, additional reservoir 8, location-plate 9, upper mounting plate 10, lower platform 11, sobs and inhale reset prosthetic device 23, grid spacer corrective gauge 36 of box 12 (two), fuel rod pedometer 17, weight line 20, the two-dimensional guide wing and form.
Eddy detection system 2, as shown in Figure 3.The eddy current signal of MIZ-7 eddy current instrument 14 outputs is input A/D converting unit 15 earlier, introduce computing machine 16 again, and the ET-555H eddy current inspection analysis software that adopts domestic maturation is realized Lissajous figure and its X to eddy current signal, Y divides spirogram to carry out analyzing with screen, record, store and analyze again, reduced to greatest extent to making a definite diagnosis the damaged operation that pulls and pushes fuel rod repeatedly that must carry out of fuel rod, a fuel list rod only need detect once, can carry out the playback analysis to flaw indication repeatedly, a floppy disk just can store the signal of whole defectives, and the preservation of data and editor very convenient, thereby also improved the accuracy rate and the efficient of testing greatly.
Fuel rod pedometer 17, as shown in Figure 4.Between carpenters square 18 by diameter or thickness be different size (1.0,1.5,2.5,3.0mm), length is that the stainless steel barred body of 100mm and stainless steel right cylinder that φ 15mm, length are 20mm are welded, and is equipped with a screw on the right cylinder.Between carpenters square 18 can be by being bolted on the solid connecting link 19.
Weight line 20, as shown in Figure 5.Be formed by connecting by stainless steel weight 21 and nylon cotton rope 22.
The two-dimensional guide wing prosthetic device 23 that resets is shown in Fig. 6,7.Mainly by the drive link 26 of gear 25, band tooth plate, proofread and correct the jacking block 27 that resets, hanger 28, framework 29, bracing frame 30, auxiliary stock 31, bearing 32, axostylus axostyle 33, cover plate 34 and side plate 35 and form.Be symmetrical arranged bracing frame 30 respectively on four faces of rectangular frame 29, at framework 29 long faces slideway is set respectively, on wide of framework 29, have through hole, and cover plate 34 up and down be set, the another side of cover plate 34 is connected with the side plate 35 of a band through hole, on the cover plate 34 dead eye is set up and down, the through hole on through hole on the framework 29 and the side plate 35 is positioned on the concentricity line.Bearing 32 is set on the dead eye of cover plate 34, the axostylus axostyle 33 of an end band sexangle drive block is installed on the bearing 32, gear 25 is installed on the axostylus axostyle 33, an end of band sexangle drive block is connected with auxiliary stock 31 on the axostylus axostyle 33.The drive link 26 of the through hole mounting strap tooth plate on through hole on the framework 29 and the side plate 35, the tooth plate on the drive link 26 and gear 25 meshing transmissions.Be provided with in the framework 29 and proofread and correct the jacking block 27 that resets, the reset rectifying plane and the fuel assembly 13 grid spacer coaming plate profiles of jacking block 27 of correction match, the reset both sides of jacking block 27 of correction are provided with two little orienting lugs, the reset two ends of jacking block 27 of correction are arranged on the slideway of framework 29 long faces, the correction jacking block 27 that resets is connected by pin with an end of drive link 26, can slide on the slideway of framework 29 under the effect of drive link 26.In addition, balance is provided with hanger 28 on bracing frame 30 and upper cover plate 24.
Grid spacer corrective gauge 36 is shown in Fig. 8,9.U-shaped cylinder scale 37 is provided with a screw, can be threaded with stock 36.
Sob inhale to check, check, utilize sob inhale device to irradiation after fuel assembly sob to inhale and check, confirm that fuel rod has or not disrepair phenomenon.
Telescope and underwater television system are adopted in underwater television outward appearance preliminary investigation, check, can clearly supervise and confirm underwater operation, to the distortion check that comprises after the damaged fuel assembly reparation that interrod spacing rule are checked and straight degree is checked.Interrod spacing rule are checked, as shown in Figure 4, fuel assembly to be measured is hung a certain correct position of check pond pool side, under water under the supervision of TV, the manual operation stock is in the spacing of the interrod spacing chi (generally using 2.5mm) of different size (1.0,1.5,2.5,3.0mm) two fuel rods of outermost layer of inserting fuel assembly 3-6 layer screen work with diameter or thickness.If interrod spacing chi (〉=2.5mm specification) can insert smoothly and can move up and down by there not being the jam phenomenon, illustrate that fuel rod has enough residue interrod spacings between two screen work aspects.Straight degree is checked, as shown in Figure 5, at first put into the weight line that connects, under water under the supervision of TV, make plumb line be close to the linea angulata of the last bottom nozzle of fuel assembly examine face, then the weight line is fixed on the spentnuclear fuel long handle instrument, adjusts camera and aim at base position, the applying situation of successively observing weight line and 8 layers of grid spacer from top to bottom of going up.Carry out the straight degree inspection of assembly diagonal angle seamed edge with using the same method behind the fuel assembly Rotate 180 °, observe the applying situation of weight line and 8 layers of grid spacer.The weight line applying situation at this diagonal angle of fuel assembly is carried out the straight degree evaluation of fuel assembly as a contrast groups, and the straight degree inspection that can carry out another diagonal angle of fuel assembly when unusual circumstance is estimated fuel assembly bulk deformation situation with for referencial use with this.The distortion of underwater television outward appearance is checked and is confirmed that the fuel assembly one-piece construction is complete, and fuel rod, skeleton and other parts N/D and obviously distortion after the passed examination, are hung go back to the spentnuclear fuel pond and prepared back the heap use.
Damaged rod is changed flow process: breakage assembly to be repaiied is tumbled 180 °, the dismounting bottom nozzle, carry out fuel rod and take out excellent eddy current test, replacing burst slug rod, the assembling bottom nozzle, fuel assembly after repairing is tumbled 180 °, sob and inhale check and the check of underwater television outward appearance, be up to the standards then to return to pile and use.Its specific operation process is as follows:
It utilizes fuel handling machine that breakage is waited to repair fuel assembly 13 handlings and fuel assembly 13 is tumbled in the basket 3 of tumbling of prosthetic device after 180 °, basket 3 hangs upper mounting plate 10 together with tumbling, after pulling down 20 set nuts and pull down bottom nozzle with set nut anchor clamps 5 with bottom nozzle gripping tool 4, hang on the lower platform 11 together with the basket 3 of tumbling again, extract 204 fuel rods one by one with fuel rod replacing device 1, take out in the rod motion and carry out eddy current inspection with eddy detection system 2, there is not damaged single rod to turn back to original position, find that damaged single rod deposits useless excellent hold-up vessel 7 in, and change with the close fresh fuel rod of enrichment.After whole 204 fuel rod eddy current inspections are intact, the basket 3 of will tumbling winches to upper mounting plate 10 usefulness bottom nozzle gripping tools together with fuel assembly 13 and loads base 4 times, with set nut anchor clamps 5 the back handling is loaded onto and locked to new set nut and to tiltable frame 3, tumble 180 °, again fuel assembly 13 is hung to sob to inhale to sob in the box 12 and inhale check, and carry out the underwater television outward appearance and check, after the passed examination, return heap and use.
Reparation, the trimming process of the local slight damage of grid spacer coaming plate are divided into: adopt the basket of tumbling tentatively to smooth, utilize the two-dimensional guide wing prosthetic device that resets to proofread and correct, and utilize the verification of grid spacer corrective gauge qualified.Its specific operation process is as follows:
The first step utilizes the basket of tumbling tentatively to smooth, tumble basket and correction thereof, as shown in figure 10.Method one, to treat that school fuel assembly 13 hangs in the basket 3 of tumbling, when the close basket of tumbling of the outer part of sticking up of grid spacer guide vane distortion suitable for reading 39 the time, manual operation makes crushed element monolateral near the basket of tumbling suitable for reading 39 of fuel assembly, utilize fuel assembly 13 to descend from gravity, under water under the supervision of television system, make the outer guide vane that sticks up of distortion be corrected to up position.Assembly to the screen work upper deformation adopts insert method down, the method for carrying in the assembly employing to the screen work lower deformation.Method two hangs in the basket 3 of tumbling with fuel assembly 13 to be corrected, and the basket 3 of will tumbling turns over to horizontal level, should make assembly guide vane deformation plance down, utilizes the assembly deadweight to make the outer guide vane smoothing of sticking up of distortion.
Second step, utilize the two-dimensional guide wing prosthetic device that resets to proofread and correct, manual operation makes the outer guide vane that sticks up of distortion be returned to upstate substantially.Shown in Fig. 6,7, when proofread and correct implementing, utilize wire rope that the two-dimensional guide wing prosthetic device 23 that resets is lifted the top that the screen work lattice cell is stored in the spentnuclear fuel pond earlier, by 4 bracing frames 30 be fixed to a certain empty lattice cell directly over.Under water under the supervision of TV, with fuel assembly to be corrected 13 be inserted into down gradually the two-dimensional guide wing reset prosthetic device 23 framework 29 and store in the screen work lattice cell, the grid spacer coaming plate that makes guide vane distortion is over against the correction jacking block 27 that resets, manually stock 31 is assisted in remote-controlled operation, the external force that manually is applied to auxiliary stock 31 is transferred on the gear 25 by axostylus axostyle 33, utilize gear 25 with the band tooth plate drive link 26 between cooperate, the correction jacking block 27 that resets that drive is connected on the drive link 26 of band tooth plate moves back and forth in the slideway of framework 29, and externally applied forces finally is added on the outer guide vane 24 that sticks up of screen work distortion by these gear trains.The reset rectifying plane and the fuel assembly 13 grid spacer coaming plate profiles of jacking block 27 of correction match, range of movement is limited in the slideway of framework 29, the reset both sides of jacking block 27 of correction are provided with two little orienting lugs, reset good fit between jacking block 27 and the grid spacer coaming plate and do not damage the screen work coaming plate to guarantee to proofread and correct.By gear train external force is applied on the outer guide vane that sticks up of distortion, makes local deformation stick up the position outward and be corrected to upstate.
The 3rd step, utilize the grid spacer corrective gauge to carry out verification, shown in Fig. 8,9, under water under the supervision of television system, by stock the grid spacer corrective gauge is inserted on the grid spacer after the correction, the distortion of plaid matching brattice guide vane is outer sticks up the position and proofreaies and correct the back and cross the rule check.If the grid spacer after proofreading and correct can pass through the grid spacer corrective gauge smoothly, the outer deflection≤0.5mm that sticks up guide vane of distortion is described, be returned to upstate.
Fuel rod is damaged, the skeleton behind the grid spacer coaming plate major injury is changed flow process and is: breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair the fuel assembly from breakage and to extract 102 old rods out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the combustion assembly from breakage and pack in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, the disintegration breakage waits to repair the combustion assembly, and therefrom extracts 102 old rods out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the combustion assembly from breakage and pack in this novel fuel assembly, therefrom extract 51 new rods out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; Novel fuel assembly is tumbled 180 °, sob and inhale check and the check of underwater television outward appearance, be up to the standards and then return the heap use.
Because the skeleton of fuel assembly is to be formed by connecting by 8 layers of grid spacer, last bottom nozzle and 20 control rod guide pipes and 1 neutron flux measurement pipe, the key that grid spacer coaming plate major injury assembly is handled is to change the skeleton that is damaged, and uses the old fuel rod that does not damage and keep.Its specific operation process is as follows:
The first step, with fuel handling machine skeleton being damaged the fuel assembly handling tumbles after basket 3 tumbles to prosthetic device, hang upper mounting plate 10, after pulling down 20 set nuts and pull down bottom nozzle with set nut anchor clamps 5 with bottom nozzle gripping tool 4, hang lower platform 11 again, take out 102 rods to useless excellent hold-up vessel 7 with fuel rod replacing device 1.The basket 3 of will tumbling winches to upper mounting plate 10 usefulness bottom nozzle gripping tools together with assembly and loads base 4 times, with set nut anchor clamps 5 the back handling is loaded onto and locked to new set nut and tumbles to tiltable frame, assembly is hung to sob to inhale in the box 12 again and keeps in.
Second step, the novel fuel assembly of preparing as skeleton is changed is hung the basket 3 of tumbling, tumble and winch to upper mounting plate 10 after basket 3 is tumbled and pull down base, hang lower platform 11 again, take out 51 new rods to additional reservoir 8 and transfer to the temporary place of fuel factory building hall one platform by additional reservoir 8, to there be 51 old fuel rods of defective to install in the New Parent in the useless excellent hold-up vessel 7 by its rod position in the damage assembly, to take out 51 new rods after location-plate 9 rotation again to additional reservoir 8 and transfer to the temporary place of fuel factory building hall one platform by additional reservoir 8, to there be 51 old fuel rods of defective to install in the New Parent in the useless excellent hold-up vessel 7 by its rod position in the damage assembly, to take out 51 new rods after location-plate 9 rotation again to additional reservoir 8 and transfer to the temporary place of fuel factory building hall one platform by additional reservoir 8, the basket 3 of will tumbling winches to upper mounting plate together with assembly and loads base 10 times, tumble to tiltable frame with new set nut locking back handling, again assembly is hung another and sob in the suction box 12 temporary.
The 3rd step, will sob after the skeleton damage fuel assembly handling of inhaling in the box 12 tumbles to the basket 3 of tumbling with fuel handling machine again, hang upper mounting plate 10 and pull down base, hang lower platform 11 again, take out 102 rods to the excellent hold-up vessel 7 that gives up.The basket 3 of will tumbling winches to upper mounting plate together with assembly and loads base 10 times, tumbles to tiltable frame with new set nut locking back handling, the empty skeleton that damages assembly is hung spentnuclear fuel pond assigned address store.
The 4th step, another is sobbed the New Parent of inhaling in the box 12 hangs and winches to upper mounting plate 10 after the basket 3 of tumbling is tumbled, pull down base, hang lower platform 11 again, to there be 51 old fuel rods of defective to install in the New Parent in the useless excellent hold-up vessel 7 by its rod position in the damage assembly, transfer to the temporary place of fuel factory building hall one platform with taking out 51 new rods after location-plate 9 rotation again to additional reservoir 8 and by additional reservoir, 51 old fuel rods that do not have defective in will useless excellent hold-up vessel 7 install in the New Parent by its rod in the damage assembly.The basket 3 of will tumbling winches to upper mounting plate together with assembly and loads base 10 times, after new set nut locking, presss from both sides the flat set nut of flat instrument 6 folders with set nut, and handling is tumbled to tiltable frame again, and so far, the skeleton of damage fuel assembly is changed operation and finished.
The 5th step, fuel assembly behind the replacing skeleton, palpus utilization is sobbed the suction device and is sobbed suction inspection, confirm that assembly does not have disrepair phenomenon, and utilize underwater television system to carry out visual examination, confirm that the assembly one-piece construction is complete, fuel rod, skeleton and other parts N/D and obviously distortion, after the passed examination, hang go back to the spentnuclear fuel pond and prepare back the heap use.
In the 6th step, skeleton is changed whole fresh fuel list rods of transferring on the water surface, transports back after the cleaning decontamination and uses after fresh fuel manufacturing plant reexamines assembling.
Damaged rod behind fuel rod breakage, the grid spacer coaming plate major injury is changed, skeleton is changed flow process and is: breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair the fuel assembly from breakage and to extract 102 old rods out, carry out fuel rod simultaneously and take out excellent eddy current test, replacing burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the combustion assembly from breakage and pack in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, the disintegration breakage waits to repair the combustion assembly, and therefrom extracts 102 old rods out, carries out fuel rod simultaneously and take out excellent eddy current test, changes the burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the combustion assembly from breakage and pack in this novel fuel assembly, therefrom extract 51 new rods out, will wait to repair other 51 old rods of extracting out the combustion assembly from breakage and pack in the novel fuel assembly; Novel fuel assembly is tumbled 180 °, sob and inhale check and the check of underwater television outward appearance, be up to the standards and then return the heap use.Its specific operation process is as follows:
The first step, with fuel handling machine skeleton being damaged the fuel assembly handling tumbles after basket 3 tumbles to prosthetic device, hang upper mounting plate 10, after pulling down 20 set nuts and pull down bottom nozzle with set nut anchor clamps 5 with bottom nozzle gripping tool 4, hang lower platform 11 again, take out 102 rods to useless excellent hold-up vessel 7 with fuel rod replacing device 1, take out and carry out eddy current inspection in the rod motion one by one, damaged single rod of discovery deposits useless excellent hold-up vessel 7 in.The basket 3 of will tumbling winches to upper mounting plate 10 usefulness bottom nozzle gripping tools together with assembly and loads base 4 times, with set nut anchor clamps 5 the back handling is loaded onto and locked to new set nut and tumbles to tiltable frame, assembly is hung to sob to inhale in the box 12 again and keeps in.
Second step, the novel fuel assembly of preparing as skeleton is changed is hung the basket 3 of tumbling, tumble and winch to upper mounting plate 10 after basket 3 is tumbled and pull down base, hang lower platform 11 again, take out 51 new rods to additional reservoir 8 and transfer to the temporary place of fuel factory building hall one platform by additional reservoir 8, to there be 51 old fuel rods (damaged rod is changed with the close fresh fuel rod of enrichment) of defective to install in the New Parent in the useless excellent hold-up vessel 7 by its rod position in the damage assembly, to take out 51 new rods after location-plate 9 rotation again to additional reservoir 8 and transfer to the temporary place of fuel factory building hall one platform by additional reservoir 8, to there be 51 old fuel rods (damaged rod is changed with the close fresh fuel rod of enrichment) of defective to install in the New Parent in the useless excellent hold-up vessel 7 by its rod position in the damage assembly, to take out 51 new rods after location-plate 9 rotation again to additional reservoir 8 and transfer to the temporary place of fuel factory building hall one platform by additional reservoir 8, the basket 3 of will tumbling winches to upper mounting plate together with assembly and loads base 10 times, tumble to tiltable frame with new set nut locking back handling, again assembly is hung another and sob in the suction box 12 temporary.
The 3rd step, to sob after the skeleton damage fuel assembly handling of inhaling in the box 12 tumbles to the basket 3 of tumbling with fuel handling machine again, hang upper mounting plate 10 and pull down base, hang lower platform 11 again, take out 102 rods to useless excellent hold-up vessel 7, take out and carry out eddy current inspection in the rod motion one by one, damaged single rod of discovery deposits useless excellent hold-up vessel 7 in.The basket 3 of will tumbling winches to upper mounting plate together with assembly and loads base 10 times, tumbles to tiltable frame with new set nut locking back handling, the empty skeleton that damages assembly is hung spentnuclear fuel pond assigned address store.
The 4th step, another is sobbed the New Parent of inhaling in the box 12 hangs and winches to upper mounting plate 10 after the basket 3 of tumbling is tumbled, pull down base, hang lower platform 11 again, to there be 51 old fuel rods (damaged rod is changed with the close fresh fuel rod of enrichment) of defective to install in the New Parent in the useless excellent hold-up vessel 7 by its rod position in the damage assembly, transfer to the temporary place of fuel factory building hall one platform with taking out 51 new rods after location-plate 9 rotation again to additional reservoir 8 and by additional reservoir, 51 the old fuel rods (damaged rod is changed with the close fresh fuel rod of enrichment) that do not have defective in will useless excellent hold-up vessel 7 install in the New Parent by its in the damage assembly excellent.The basket 3 of will tumbling winches to upper mounting plate together with assembly and loads base 10 times, after new set nut locking, presss from both sides the flat set nut of flat instrument 6 folders with set nut, and handling is tumbled to tiltable frame again, and so far, the damaged rod of damage fuel assembly is changed, skeleton is changed operation and finished.
The 5th step, damaged rod, skeleton are changed the back fuel assembly, palpus utilization is sobbed the suction device and is sobbed suction inspection, and utilize underwater television system to carry out visual examination, confirm that the assembly one-piece construction is complete, fuel rod, skeleton and other parts N/D and obviously distortion after the passed examination, are hung go back to the spentnuclear fuel pond and are prepared back the heap use.
In the 6th step, skeleton is changed whole fresh fuel list rods of transferring on the water surface, transports back after the cleaning decontamination and uses after fresh fuel manufacturing plant reexamines assembling.
Claims (1)
1. burst slug assembly repair technology after irridiation is characterized in that: may further comprise the steps:
(1) sob the fuel assembly of inhaling the breakage of inspection affirmation fuel rod, the fuel assembly of grid spacer coaming plate damage is confirmed in the underwater television visual examination;
(2) when the fuel rod breakage, when the grid spacer coaming plate does not damage, breakage fuel assembly to be repaiied tumbled 180 ° dismantle bottom nozzle, carry out fuel rod and take out excellent eddy current test, replacing burst slug rod, the assembling bottom nozzle, fuel assembly after repairing is tumbled 180 °, sob and inhale check and the check of underwater television outward appearance, be up to the standards then to return to pile and use;
(3) local when slight when fuel rod breakage, grid spacer coaming plate degree of injury, adopt the blue preliminary smoothing of tumbling, the two-dimensional guide wing prosthetic device that resets to proofread and correct, utilize the verification of grid spacer corrective gauge qualified after, enter step (2) flow process again;
(4) when the fuel rod breakage, when grid spacer coaming plate degree of injury is serious, breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair the fuel assembly from breakage and to extract 102 old rods out, carry out fuel rod simultaneously and take out excellent eddy current test, replacing burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the fuel assembly from breakage packs in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the fuel assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, disintegration breakage fuel assembly to be repaiied, and therefrom extract remaining 102 old rods out, carry out fuel rod simultaneously and take out excellent eddy current test, change the burst slug rod, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, to wait to repair 51 old rods extracting out the fuel assembly from breakage packs in this novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair 51 last old rods of extracting out the fuel assembly from breakage and pack in the novel fuel assembly; The assembling novel fuel assembly is tumbled 180 ° with novel fuel assembly, sobs and inhales check and the check of underwater television outward appearance, is up to the standards then to return to pile and uses;
(5) when fuel rod is damaged, grid spacer coaming plate degree of injury is local when slight, adopt the blue preliminary smoothing of tumbling, the two-dimensional guide wing prosthetic device that resets to proofread and correct, utilize the qualified back of grid spacer corrective gauge verification to return heap and use;
(6) damaged when fuel rod, when grid spacer coaming plate degree of injury is serious, breakage fuel assembly to be repaiied is tumbled 180 °, disintegration breakage fuel assembly to be repaiied, and wait to repair from breakage and extract 102 old rods the fuel assembly out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly, from novel fuel assembly, extract 51 new rods out, to wait to repair 51 old rods extracting out the fuel assembly from breakage packs in the novel fuel assembly, from novel fuel assembly, extract 51 new rods again out, will wait to repair other 51 old rods of extracting out the fuel assembly from breakage and pack in the novel fuel assembly; From novel fuel assembly, take out 51 new rods, the assembling novel fuel assembly, disintegration breakage fuel assembly to be repaiied, and therefrom extract remaining 102 old rods out, assembling breakage fuel assembly to be repaiied; The disintegration novel fuel assembly will be waited to repair 51 old rods extracting out the fuel assembly from breakage and pack in this novel fuel assembly, extract 51 new rods from novel fuel assembly out, will wait to repair 51 last old rods of extracting out the fuel assembly from breakage and pack in the novel fuel assembly; The assembling novel fuel assembly is tumbled 180 ° with novel fuel assembly, sobs and inhales check and the check of underwater television outward appearance, is up to the standards then to return to pile and uses.
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| CN105023623B (en) * | 2015-06-24 | 2017-10-10 | 中广核核电运营有限公司 | Nuclear fuel assembly prosthetic device and method |
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| CN102314952A (en) * | 2010-06-30 | 2012-01-11 | 上海核工程研究设计院 | Fuel-basket tipping device |
| CN102446565A (en) * | 2010-10-12 | 2012-05-09 | 秦山核电有限公司 | Two-dimensional guide vane reset repair device |
| CN102324257B (en) * | 2011-06-10 | 2014-07-09 | 中国广核集团有限公司 | Radiation protection control method for unit operation and maintenance during fuel damage of pressurized water reactor nuclear power station |
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| CN106531253A (en) * | 2016-11-25 | 2017-03-22 | 福建福清核电有限公司 | Online appearance inspection method for fuel |
| CN108039215B (en) * | 2017-11-06 | 2019-07-19 | 中广核核电运营有限公司 | Fuel assembly skeleton repair system and method |
| CN109686467B (en) * | 2018-12-27 | 2023-03-21 | 中广核研究院有限公司 | Pressurized water reactor fuel assembly damage repair method |
| CN113118669B (en) * | 2019-12-30 | 2023-05-12 | 中核北方核燃料元件有限公司 | Rod bundle carrying clamp for picking up integrated end plate |
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| CN105023623B (en) * | 2015-06-24 | 2017-10-10 | 中广核核电运营有限公司 | Nuclear fuel assembly prosthetic device and method |
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