CN108269628B - Ultrasonic inspection device for square arranged damaged fuel assemblies - Google Patents
Ultrasonic inspection device for square arranged damaged fuel assemblies Download PDFInfo
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- CN108269628B CN108269628B CN201611261082.0A CN201611261082A CN108269628B CN 108269628 B CN108269628 B CN 108269628B CN 201611261082 A CN201611261082 A CN 201611261082A CN 108269628 B CN108269628 B CN 108269628B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
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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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- High Energy & Nuclear Physics (AREA)
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Abstract
The invention relates to the technical field of ultrasonic inspection of fuel assemblies, and particularly discloses an ultrasonic inspection device for square-arranged damaged fuel assemblies. The upper guide component for supporting the fuel component to be inspected is arranged on the bottom plate of the flat plate structure, the probe and the driving mechanism thereof and the emergency disengaging component are arranged on the bottom plate at one side of the upper guide component, and the probe component in the probe and the driving mechanism thereof can move along the left-right direction of the horizontal X axis and the front-back direction of the horizontal Y axis for full coverage inspection of the fuel rod in the fuel component; the emergency disengaging assembly is fixedly connected with the probe and the driving mechanism thereof and is used for disengaging the probe and the driving mechanism thereof from the range of the fuel assembly on the upper guide assembly under emergency conditions. The device can realize the positioning of the fuel assembly relative to the inspection device; performing full-coverage ultrasonic inspection on the square-arranged fuel rods; the damage to the fuel rod caused by the movement of the two shafts is avoided by the torsion limiter and the probe part telescopic cylinder.
Description
Technical Field
The invention belongs to the technical field of ultrasonic inspection of fuel assemblies, and particularly relates to an ultrasonic inspection device for square arranged damaged fuel assemblies.
Background
In a pressurized water reactor nuclear power plant, nuclear fuel is contained within a thin walled cladding tube sealed by end plugs, the cladding material being a zirconium alloy, the end plugs being welded at both ends of the cladding tube by means of electron beam, pressure resistance welding or argon tungsten-arc welding, and then a number of fuel rods being assembled together to form a nuclear fuel assembly. The nuclear fuel assembly generates thermal energy through fission reactions in the reactor core. It is an extremely important component of a nuclear power plant and is the first barrier to prevent leakage of nuclear fuel.
The M310, ACPR1000 and CPR1000 pressurized water reactor nuclear power plants in China adopt AFA-3G type fuel assemblies, and fuel rods are arranged according to 17x 17. The fuel assembly consists of fuel rods, lower and upper tube seats, guide and instrumentation tubes, and various grids. Each fuel assembly contained 289 rod sites, arranged in a 17x17 square grid, each measured by 264 fuel rods, 24 control rod guide tubes, and 1 neutron flux tube. The fuel rod comprises a fuel pellet, a fuel cladding, a compression spring, an upper end plug, a lower end plug and the like. Due to the complex and severe operating conditions of the reactor core and the high radioactivity, the performance of the fuel assembly cladding material can be changed, if the cladding itself has certain defects, particularly at the welding seam between the end plug and the cladding tube, defect expansion is likely to occur in the operating process, and finally the nuclear fuel assembly is damaged. The damage of the fuel assembly directly leads radioactive substances to enter a loop, so that the environmental dose and the radioactive pollution level of the whole reactor factory building are sharply improved, even the reactor is shut down, and the safety and the stable operation of the unit are greatly influenced. The ultrasonic inspection is carried out on the fuel assembly, the rod positions of the damaged fuel assembly and the damaged fuel rods in the assembly are determined, and the damaged fuel assembly is sealed in a sealed tank or the damaged fuel rods are replaced, so that radioactive substances are prevented from continuously entering a primary loop of the nuclear reactor.
When the ultrasonic inspection device inspects, the ultrasonic probe transmits and receives ultrasonic signals (specifically plate waves) for each fuel rod, and when the ultrasonic signals pass through the pipe wall, the ultrasonic signals can be attenuated obviously when water exists on the inner wall of the fuel rod. Therefore, it is possible to distinguish a fuel rod having good water tightness from a leaking fuel rod by judging how much the received ultrasonic signal is attenuated. The echo signal of the leaked fuel rod may be lower than that of the fuel rod with good water tightness.
Disclosure of Invention
The invention aims to provide an ultrasonic inspection device for a square-arrangement broken fuel assembly, which can realize ultrasonic inspection on each fuel rod of the square-arrangement fuel assembly so as to determine whether the fuel assembly is broken and the rod position of the broken fuel rod in the broken assembly.
The technical scheme of the invention is as follows: the ultrasonic inspection device for the square arranged broken fuel assemblies comprises a bottom plate, an upper guide assembly, a probe and a driving mechanism thereof, an emergency separation assembly, a frame and a fuel assembly jacking mechanism, wherein the upper guide assembly for supporting the fuel assemblies to be inspected is arranged on the bottom plate of a flat plate structure, the probe and the driving mechanism thereof and the emergency separation assembly are arranged on the bottom plate at one side of the upper guide assembly, and probe components in the probe and the driving mechanism thereof can move along the left-right direction of a horizontal X axis and the front-back direction of a horizontal Y axis for full coverage inspection of fuel rods in the fuel assemblies; the emergency disengaging assembly is fixedly connected with the probe and the driving mechanism thereof and is used for disengaging the probe and the driving mechanism thereof from the range of the fuel assembly on the upper guide assembly under emergency conditions.
Two fuel assembly jacking mechanisms are arranged on the bottom plates at two sides around the upper guide assembly, and are arranged at a right angle of 90 degrees; the fuel assembly jacking mechanism comprises a jacking cylinder mounting seat, a jacking cylinder and a front end jacking block, wherein the jacking cylinder is mounted on the bottom plate through the jacking cylinder mounting seat, and the front end jacking block is arranged at the end part of the jacking cylinder close to the upper guide assembly; after the fuel assembly is led into the upper guide assembly, the cylinder rod of the jacking cylinder stretches out, and the front-end jacking block is used for compacting the lower tube seat of the fuel assembly, so that the fuel assembly is fixed.
The base plate on one side of the upper guide component is provided with a calibration component overturning mechanism, the calibration component overturning mechanism comprises a swing cylinder mounting seat, a swing cylinder and a calibration component, wherein the swing cylinder is mounted on the base plate through the swing cylinder mounting seat, the calibration component is mounted on the swing cylinder, and the calibration component is driven to swing to or move out of the upper guide component through the swing cylinder.
The bottom plate is also provided with a frame, and a video monitoring system and a junction box are arranged on the frame, wherein the video monitoring system can monitor the upper guide assembly in a video manner; the video monitoring system adopts a radiation-resistant camera; the junction box supplies power for the probe and a driving mechanism and other electrical equipment thereof.
The probe and the driving mechanism thereof comprise a probe part, an X-axis driving part and a Y-axis driving part, wherein the probe part is connected with the X-axis driving part and the Y-axis driving part, and the whole operation of the probe part along two axes of the X axis and the Y axis is realized through the X-axis driving part and the Y-axis driving part; the probe part comprises a probe part fixing seat, a probe part sliding seat, a probe part telescopic cylinder and an ultrasonic detection probe, wherein the probe part fixing seat provided with the ultrasonic detection probe is fixedly connected with a Y-axis driving nut in a Y-axis driving part, and the ultrasonic detection probe is driven to move forwards or backwards in the Y-axis direction under the action of the Y-axis driving part; the probe part sliding seat is fixedly connected with the probe part telescopic cylinder, and the probe part sliding seat can be driven to move back and forth relative to the probe part fixing seat by the probe part telescopic cylinder with adjustable air pressure.
The emergency disengaging assembly comprises an emergency disengaging part guide structure, an emergency disengaging pin assembly, a rope pulley assembly and a rope ring, wherein the emergency disengaging part guide structure comprises a linear shaft and a linear bearing which are arranged on a bottom plate, the probe and a driving mechanism thereof are integrally arranged on the emergency disengaging part guide structure, and the probe and the driving mechanism thereof are pulled to retreat along the Y-axis direction through the rope pulley assembly and the rope ring which are arranged on the emergency disengaging part guide structure; an emergency release pin assembly is also mounted on the emergency release component guide structure for limiting movement of the probe and its drive mechanism and the base plate on the emergency release component guide structure.
The emergency release pin assembly comprises an emergency release pin mounting seat, an emergency release pin shaft, an emergency release pin rod, an emergency compression spring and an emergency tension spring, wherein the emergency release pin rod is connected with the emergency release pin mounting seat on the emergency release component guide structure through the emergency tension spring, the other end of the emergency release pin rod is sleeved on the emergency release pin shaft, the emergency compression spring sleeved on the emergency release pin shaft is pressed in an emergency release pin shaft groove, a pin is arranged in a pin hole at the upper end of the emergency release pin rod, and the pin is connected with the rope pulley assembly; the emergency release pin rod is inserted into the bottom plate, and the probe and the driving mechanism thereof are relatively fixed with the bottom plate; under emergency, the rope ring is pulled by the long rod with the hook at the lower part, the rope ring pulls the emergency pin pulling rod through the rope pulley assembly, the emergency separation pin shaft is pulled out from the bottom plate, and under the action of pulling force, the whole backing of the probe and the driving part thereof is realized, so that the probe part is separated from the fuel assembly, and the safety of the fuel assembly is ensured.
The X-axis driving part and the Y-axis driving part adopt a screw rod and nut driving mode, the guide is realized by using a linear shaft and a linear bearing, and in the gear transmission of the motor driving screw rod, a torsion limiter is arranged, so that the driving force of the X-axis in the left-right horizontal direction and the Y-axis in the front-back direction is limited, and the damage of the ultrasonic monitoring probe to the fuel rod is avoided.
The bottom plate below still be equipped with lower part direction subassembly, it includes 4 cylindric locks and connecting plate, wherein cylindric lock one end and bottom plate fixed connection, the two liang of cylindric lock tip of the other end pass through the connecting plate and connect and form rigid structure to can be used to the location to fuel storage grillwork.
The invention has the remarkable effects that: the ultrasonic inspection device for the square arranged damaged fuel assemblies has the following advantages: 1) Positioning and supporting the damaged fuel assembly inspection device on the fuel storage grid are realized through the lower guide assembly and the bottom plate; 2) The fuel assembly is guided into the damaged fuel assembly inspection device through the upper guide assembly, and the fuel assembly jacking mechanism fixes the fuel assembly in the upper guide assembly, so that the fuel assembly is positioned relative to the inspection device; 3) The probe and the driving mechanism thereof drive the probe part to move in the fuel assembly along two axes, so that the full-coverage ultrasonic inspection of the square arranged fuel rods is realized; the damage to the fuel rod caused by the movement of the two shafts is avoided through the torsion limiter and the probe part telescopic cylinder; 4) In case of electrical failure or other emergency, the fuel assembly is separated from the broken fuel assembly ultrasonic inspection device through the emergency separation component, so that the safety of the fuel assembly is ensured.
Drawings
FIG. 1 is a front view of an ultrasonic inspection device of a square array of broken fuel assemblies according to the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic view of the probe and its driving mechanism in FIG. 1;
FIG. 4 is a schematic view of the probe assembly of FIG. 1;
FIG. 5 is a schematic view of the emergency release member of FIG. 1;
FIG. 6 is a schematic view of the emergency release pin assembly of FIG. 5;
FIG. 7 is a schematic diagram of the turnover mechanism of the modular unit in FIG. 1;
in the figure: 1. a bottom plate; 2. an upper guide assembly; 3. a probe and a driving mechanism thereof; 4. a video monitoring system; 5. a junction box; 6. an emergency disconnect package; 7. a frame; 8. calibrating an overturning mechanism of the assembly; 9. a lower guide assembly; 10. a fuel assembly tightening mechanism; 11. a probe member; 12. an X-axis driving part; 13. a Y-axis driving part; 14. a probe component holder; 15. a probe component slide seat; 16. a probe part telescopic cylinder; 17. an ultrasonic detection probe; 18. an emergency release component guide structure; 19. an emergency release pin assembly; 20. a sheave assembly; 21. a rope loop; 22. emergency release pin mounting base; 23. emergency separating pin shaft; 24. an emergency pin pulling rod; 25. an emergency compression spring; 26. an emergency tension spring; 27. a swing cylinder mounting seat; 28. a swing cylinder; 29. calibrating the assembly; 30. a cylindrical pin; 31. a connecting plate; 32. tightly pushing the cylinder mounting seat; 33. a cylinder is tightly propped; 34. the front end is tightly propped against the block.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
As shown in fig. 1 and 2, an ultrasonic inspection device for a broken fuel assembly in square arrangement comprises a bottom plate 1, an upper guide assembly 2, a probe and a driving mechanism 3 thereof, an emergency release assembly 6, a frame 7 and a fuel assembly jacking mechanism 10, wherein the fuel assembly jacking mechanism 10, the upper guide assembly 2, the probe and the driving mechanism 3 thereof and the emergency release assembly 6 are fixed on the bottom plate 1 of a flat plate structure, the size of the upper guide assembly 2 is slightly larger than the square size of the fuel assembly to be inspected, and the upper guide assembly 2 is used for supporting a lower tube seat of the fuel assembly and determining the height of the fuel assembly in the ultrasonic inspection device; the fuel assembly jacking mechanism 10 is arranged near the upper guide assembly 2 and is used for fixedly supporting the fuel assembly; the probe and the driving mechanism 3 thereof are arranged on one side of the upper guide structure 2, and the probe part 11 in the probe and the driving mechanism 3 thereof can move along the horizontal X-axis direction and the front-back Y-axis direction, so that the probe part 11 can inspect the fuel rods in the fuel assembly; the emergency disengaging assembly 6 is fixed on the bottom plate 1, is connected with the probe and the driving mechanism 3 thereof, and drives the probe part 11 in the probe and the driving mechanism 3 thereof to leave the range of the fuel assembly through the emergency disengaging assembly 6 under special conditions; a frame 7 is also arranged on the bottom plate 1, and a video monitoring system 4 is arranged on the frame 7 for monitoring the operation of the probe and the driving mechanism 3 thereof; a junction box 5 is also arranged on the frame 7 and is used for supplying power to the probe and the driving mechanism 3 thereof as well as other electrical equipment; a calibration component overturning mechanism 8 is also arranged on the bottom plate 1 near the upper guide structure 2 and is used for underwater calibration of the damaged fuel component inspection device; a lower guide assembly 9 is arranged below the bottom plate 1 and corresponds to the position of the upper guide structure 2, and is used for being inserted into the fuel storage grid for positioning when the inspection device works;
as shown in fig. 3 and 4, the probe and the driving mechanism 3 thereof comprise a probe component 11, an X-axis driving component 12 and a Y-axis driving component 13, wherein the probe component 11 is connected with the X-axis driving component 12 and the Y-axis driving component 13, and the whole operation of the probe component 11 along two axes of the X-axis and the Y-axis is realized through the X-axis driving component 12 and the Y-axis driving component 13; the X-axis driving part 12 and the Y-axis driving part 13 adopt a screw and nut driving mode, realize guiding by utilizing a linear shaft and a linear bearing, and are provided with a torsion limiter in the gear transmission of driving the screw to rotate by a motor, thereby limiting the driving force of the X-axis in the left-right horizontal direction and the Y-axis in the front-back direction and avoiding the damage of an ultrasonic monitoring probe to a fuel rod; the probe part 11 comprises a probe part fixing seat 14, a probe part sliding seat 15, a probe part telescopic cylinder 16 and an ultrasonic detection probe 17, wherein the probe part fixing seat 14 provided with the ultrasonic detection probe 17 is fixedly connected with a Y-axis driving nut in the Y-axis driving part 13, and the ultrasonic detection probe 17 is driven to move forwards or backwards in the Y-axis direction under the action of the Y-axis driving part 13; the probe part sliding seat 15 is fixedly connected with the probe part telescopic cylinder 16, the probe part telescopic cylinder 16 can drive the probe part sliding seat 15 to move back and forth relative to the probe part fixing seat 14, and the pressure of the probe part telescopic cylinder 16 can be regulated to realize the adjustment of the pressing force when the ultrasonic detection probe 17 moves forward, so that the damage to a fuel rod caused by the excessive pressing force is avoided;
as shown in fig. 5 and 6, the emergency release assembly 6 comprises an emergency release component guiding structure 18, an emergency release pin assembly 19, a rope pulley assembly 20 and a rope loop 21, wherein the emergency release component guiding structure 18 comprises a linear shaft and a linear bearing which are arranged on the bottom plate 1, the probe and the driving mechanism 3 thereof are integrally arranged on the emergency release component guiding structure 18, and the probe and the driving mechanism 3 thereof are pulled to retreat along the Y-axis direction through the rope pulley assembly 20 and the rope loop 21 which are arranged on the emergency release component guiding structure 18; an emergency release pin assembly 19 is further installed on the emergency release component guide structure 18 and used for limiting the movement of the probe and the driving mechanism 3 of the probe on the emergency release component guide structure 18, wherein the emergency release pin assembly 19 comprises an emergency release pin installation seat 22, an emergency release pin shaft 23, an emergency pull pin rod 24, an emergency compression spring 25 and an emergency tension spring 26, the emergency pull pin rod 24 is connected with the emergency release pin installation seat 22 on the emergency release component guide structure 18 through the emergency tension spring 26, the other end of the emergency pull pin rod 24 is sleeved on the emergency release pin shaft 23 and compresses the emergency compression spring 25 sleeved on the emergency release pin shaft 23 in a groove of the emergency release pin shaft 23, a pin is installed in a pin hole at the upper end of the emergency release pin rod 24, and the pin is connected with the rope pulley assembly 20; the emergency release pin rod 24 is inserted into the bottom plate 1, and the probe and the driving mechanism 3 thereof are relatively fixed with the bottom plate 1; in an emergency, the rope ring 21 is pulled by the long rod with the hook at the lower part, the rope ring 21 pulls the emergency pin pulling rod 24 through the rope pulley assembly 20, the emergency separation pin shaft 23 is pulled out of the bottom plate 1, and under the action of pulling force, the whole backing of the probe and the driving part thereof is realized, so that the probe part 11 is separated from the fuel assembly, and the safety of the fuel assembly is ensured;
as shown in fig. 7, the calibration assembly turning mechanism 8 is installed at the left side position of the upper guide assembly 2, which is close to the direction of the probe and the driving mechanism 3 thereof, and comprises a swinging cylinder installation seat 27, a swinging cylinder 28 and a calibration assembly 29, wherein the swinging cylinder 28 is installed on the bottom plate 1 through the swinging cylinder installation seat 27, the calibration assembly 29 is installed on the swinging cylinder 28, when underwater calibration is carried out, the calibration assembly 29 is swung on the upper guide assembly 2 through the swinging cylinder 28, and the probe part 11 is arranged below the X-axis driving part 12 and the Y-axis driving part 13 left and right, so that the calibration assembly 29 is detected; when the gas assembly is inspected, the swinging cylinder 28 is utilized to swing the calibration assembly 29 from the upper part to the position deviating from the upper guide assembly 2 in the anticlockwise direction, so that the normal operation of the probe part 11 and the upper guide assembly 2 is not influenced;
two fuel assembly jacking mechanisms 10 are arranged at the right side and the front side of the upper guide assembly 2, and are arranged at a right angle of 90 degrees; the fuel assembly jacking mechanism 10 comprises a jacking cylinder mounting seat 32, a jacking cylinder 33 and a front end jacking block 34, wherein the jacking cylinder 33 is mounted on the bottom plate 1 through the jacking cylinder mounting seat 32, and the front end jacking block 34 is mounted at the end part of the jacking cylinder 33 close to the upper guide assembly 2; after the fuel assembly is led into the upper guide assembly 2, the cylinder rod of the jacking cylinder 33 extends out, and the front jacking block 34 is used for compacting the lower tube seat of the fuel assembly, so that the fuel assembly is fixed;
the lower guide assembly 9 arranged below the bottom plate 1 comprises 4 cylindrical pins 30 and a connecting plate 31, wherein one end of each cylindrical pin 30 is fixedly connected with the bottom plate, and the other end of each cylindrical pin 30 forms a rigid structure through the connecting plate; in performing the inspection, the lower guide member 9 is inserted into the fuel storage grid to effect positioning of the broken fuel assembly ultrasonic detection device in the fuel storage grid.
The video monitoring system 4 can perform video monitoring on the upper guide assembly part, so that the video monitoring is realized when the fuel assembly is guided into the damaged fuel assembly inspection device and the ultrasonic detection probe enters the fuel assembly, and the damage to the fuel assembly and the fuel rod caused by improper operation is avoided. The video monitoring system is closer to the fuel assembly, so that the irradiation dose is larger, and an irradiation-resistant camera is needed.
The junction box 5 realizes the transit connection of the X-axis and Y-axis driving part motor, the ultrasonic detection probe and all pneumatic components, realizes the separation of the damaged fuel assembly ultrasonic inspection device and the control cable thereof, and avoids the pollution of the control cable by the damaged fuel assembly ultrasonic inspection device.
Claims (8)
1. An ultrasonic inspection device for a square array of broken fuel assemblies, comprising: the inspection device comprises a bottom plate (1), an upper guide assembly (2), a probe and a driving mechanism (3) thereof, an emergency disengaging assembly (6), a frame (7) and a fuel assembly jacking mechanism (10), wherein the upper guide assembly (2) for supporting the fuel assembly to be inspected is arranged on the bottom plate (1) of a flat plate structure, the probe and the driving mechanism (3) thereof and the emergency disengaging assembly (6) are arranged on the bottom plate (1) at one side of the upper guide assembly (2), and a probe part (11) in the probe and the driving mechanism (3) thereof can move along the left-right direction of a horizontal X axis and the front-back direction of a horizontal Y axis for full coverage inspection of fuel rods in the fuel assembly; the emergency disengaging assembly (6) is fixedly connected with the probe and the driving mechanism (3) thereof, and is used for disengaging the probe and the driving mechanism (3) thereof from the range of the fuel assembly on the upper guide assembly (2) under the emergency condition; the emergency disengaging assembly (6) comprises an emergency disengaging part guide structure (18), an emergency disengaging pin assembly (19), a rope pulley assembly (20) and a rope ring (21), wherein the emergency disengaging part guide structure (18) comprises a linear shaft and a linear bearing which are arranged on a bottom plate (1), the probe and a driving mechanism (3) thereof are integrally arranged on the emergency disengaging part guide structure (18), and the rope pulley assembly (20) and the rope ring (21) which are arranged on the emergency disengaging part guide structure (18) pull the probe and the driving mechanism (3) thereof to retract along the Y-axis direction; an emergency release pin assembly (19) is also mounted on the emergency release component guide structure (18) and is used for limiting the movement of the probe and the driving mechanism (3) and the bottom plate (1) on the emergency release component guide structure (18).
2. An ultrasonic inspection apparatus for a square array of broken fuel assemblies according to claim 1, wherein: two fuel assembly jacking mechanisms (10) are arranged on the bottom plates (1) at two sides around the upper guide assembly (2), and the two fuel assembly jacking mechanisms (10) are arranged at a right angle of 90 degrees; the fuel assembly jacking mechanism (10) comprises a jacking cylinder mounting seat (32), a jacking cylinder (33) and a front-end jacking block (34), wherein the jacking cylinder (33) is mounted on the bottom plate (1) through the jacking cylinder mounting seat (32), and the front-end jacking block (34) is arranged at the end part of the jacking cylinder (33) close to the upper guide assembly (2); after the fuel assembly is led into the upper guide assembly (2), the cylinder rod of the propping cylinder (33) extends out, and the front end propping block (34) presses the fuel assembly lower tube seat, so that the fuel assembly is fixed.
3. An ultrasonic inspection apparatus for a square array of broken fuel assemblies according to claim 1, wherein: the upper guide assembly comprises a base plate (1) on one side of the upper guide assembly (2), and is characterized in that a calibration assembly overturning mechanism (8) is arranged on the base plate (1) on one side of the upper guide assembly and comprises a swing cylinder mounting seat (27), a swing cylinder (28) and a calibration assembly (29), wherein the swing cylinder (28) is mounted on the base plate (1) through the swing cylinder mounting seat (27), the calibration assembly (29) is mounted on the swing cylinder (28), and the calibration assembly (29) is driven to swing to or move out of the upper guide assembly (2) through the swing cylinder (28).
4. An ultrasonic inspection apparatus for a square array of broken fuel assemblies according to claim 1, wherein: the bottom plate (1) is also provided with a frame (7), and the frame (7) is provided with a video monitoring system (4) and a junction box (5), wherein the video monitoring system (4) can monitor the upper guide assembly (2) in a video mode; the video monitoring system adopts a radiation-resistant camera; the junction box (5) supplies power for the probe and the driving mechanism (3) and other electrical equipment.
5. An ultrasonic inspection apparatus for a square array of broken fuel assemblies according to claim 1, wherein: the probe and the driving mechanism (3) thereof comprise a probe part (11), an X-axis driving part (12) and a Y-axis driving part (13), wherein the probe part (11) is connected with the X-axis driving part (12) and the Y-axis driving part (13), and the whole operation of the probe part (11) along two axes of the X axis and the Y axis is realized through the X-axis driving part (12) and the Y-axis driving part (13); the probe part (11) comprises a probe part fixing seat (14), a probe part sliding seat (15), a probe part telescopic cylinder (16) and an ultrasonic detection probe (17), wherein the probe part fixing seat (14) provided with the ultrasonic detection probe (17) is fixedly connected with a Y-axis driving nut in a Y-axis driving part (13), and the ultrasonic detection probe (17) is driven to move forwards or backwards in the Y-axis direction under the action of the Y-axis driving part (13); the probe part sliding seat (15) is fixedly connected with the probe part telescopic cylinder (16), and the probe part sliding seat (15) can be driven to move back and forth relative to the probe part fixing seat (14) through the probe part telescopic cylinder (16) with adjustable air pressure.
6. An ultrasonic inspection apparatus for a square array of broken fuel assemblies according to claim 1, wherein: the emergency release pin assembly (19) comprises an emergency release pin mounting seat (22), an emergency release pin shaft (23), an emergency release pin rod (24), an emergency compression spring (25) and an emergency tension spring (26), wherein the emergency release pin rod (24) is connected with the emergency release pin mounting seat (22) on the emergency release component guide structure (18) through the emergency tension spring (26), the other end of the emergency release pin rod (24) is sleeved on the emergency release pin shaft (23) and compresses the emergency compression spring (25) sleeved on the emergency release pin shaft (23) in a groove of the emergency release pin shaft (23), and a pin is arranged in a pin hole at the upper end of the emergency release pin rod (24) and connected with the rope pulley assembly (20); the emergency pin pulling rod (24) is inserted into the bottom plate (1), and the probe and the driving mechanism (3) thereof are relatively fixed with the bottom plate (1); under an emergency, the rope ring (21) is pulled by the long rod with the hook at the lower part, the rope ring (21) pulls the emergency pin pulling rod (24) through the rope pulley assembly (20), the emergency separation pin shaft (23) is pulled out of the bottom plate (1), and under the action of pulling force, the whole backing of the probe and the driving mechanism (3) thereof is realized, so that the probe part (11) is separated from the fuel assembly, and the safety of the fuel assembly is ensured.
7. An ultrasonic inspection device for a square array of broken fuel assemblies according to claim 5, wherein: the X-axis driving part (12) and the Y-axis driving part (13) adopt a screw rod and nut driving mode, guide is realized by utilizing a linear shaft and a linear bearing, and a torsion limiter is arranged in gear transmission for driving the screw rod to rotate by a motor, so that driving forces of the X-axis in the left-right horizontal direction and the Y-axis in the front-back direction are limited, and damage to a fuel rod by an ultrasonic monitoring probe is avoided.
8. An ultrasonic inspection apparatus for a square array of broken fuel assemblies according to claim 1, wherein: the lower guide assembly (9) is further arranged below the bottom plate (1) and comprises 4 cylindrical pins (30) and a connecting plate (31), wherein one end of each cylindrical pin (30) is fixedly connected with the bottom plate (1), and the end parts of the cylindrical pins (30) at the other ends are connected through the connecting plate (31) to form a rigid structure and can be used for positioning the fuel storage grid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611261082.0A CN108269628B (en) | 2016-12-30 | 2016-12-30 | Ultrasonic inspection device for square arranged damaged fuel assemblies |
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|---|---|---|---|
| CN201611261082.0A CN108269628B (en) | 2016-12-30 | 2016-12-30 | Ultrasonic inspection device for square arranged damaged fuel assemblies |
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| CN108269628A CN108269628A (en) | 2018-07-10 |
| CN108269628B true CN108269628B (en) | 2023-10-20 |
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| CN111354489B (en) * | 2018-12-20 | 2024-08-09 | 核动力运行研究所 | Mechanical carrier based on appearance video inspection of nuclear fuel assembly |
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