阅读说明：本技术 一种核燃料离线破损检测用的可移动式采样气体获取装置 (Movable sampling gas acquisition device for offline damage detection of nuclear fuel ) 是由 尹绪雨 张凯峰 谢晨江 于 2020-05-15 设计创作，主要内容包括：本发明提供一种核燃料离线破损检测用的可移动式采样气体获取装置,包括用于放置燃料组件且可移动的存储筒体、以及可拆卸的连接在存储筒体上端的抽气密封组件,抽气密封组件包括盖合在存储筒体上端的基板、安装在基板下端的密封圈、以及安装在基板上的抽气接头,密封圈置于基板和存储筒体之间,抽气接头与存储筒体的内腔连通。本申请为整体可移动的结构,而非固定式结构,故不需要在核电站建设期间安装固定,能够广泛应用于不同配置类型的硬体和软体架构上,实现一机多用,大大提高设备利用率,降低核电站的燃料离线啜吸检查成本。(The invention provides a movable sampling gas acquisition device for offline damage detection of nuclear fuel, which comprises a movable storage cylinder body for placing a fuel assembly and a detachable air extraction sealing assembly connected to the upper end of the storage cylinder body, wherein the air extraction sealing assembly comprises a base plate covered at the upper end of the storage cylinder body, a sealing ring arranged at the lower end of the base plate and an air extraction joint arranged on the base plate, the sealing ring is arranged between the base plate and the storage cylinder body, and the air extraction joint is communicated with an inner cavity of the storage cylinder body. The nuclear power station fuel off-line sipping inspection system is an integrally movable structure, and is not a fixed structure, so that the nuclear power station fuel off-line sipping inspection system does not need to be installed and fixed during the construction of a nuclear power station, can be widely applied to hardware and software architectures with different configuration types, achieves multiple purposes, greatly improves the equipment utilization rate, and reduces the fuel off-line sipping inspection cost of the nuclear power station.)

1. The utility model provides a gaseous acquisition device of movable sampling of nuclear fuel off-line breakage detection usefulness which characterized in that: including being used for placing fuel assembly and mobilizable storage cylinder and detachable connection at storage cylinder upper end bleed seal assembly (30), bleed seal assembly (30) close base plate (31) in storage cylinder upper end, install the sealing washer at base plate (31) lower extreme and install the joint of bleeding on base plate (31) including the lid, the sealing washer is arranged in between base plate (31) and the storage cylinder, the joint of bleeding communicates with storage cylinder's inner chamber.

2. The mobile sample gas acquisition device of claim 1, wherein: the storage cylinder body is provided with a left storage cylinder body (10) and a right storage cylinder body (20) which are arranged side by side left and right respectively, the air exhaust sealing component (30) can be installed at the upper ends of the two storage cylinder bodies in a left-right moving mode, the position of the air exhaust sealing component (30) is at least provided with a left working position and a right working position, the sealing rings are provided with a left sealing ring (32) and a right sealing ring (33) which are arranged side by side left and right respectively, and the air exhaust joint is provided with a left air exhaust joint (34) and a right air exhaust joint (35) which are arranged side by side left and right respectively; when the air suction sealing assembly (30) is located at a left working position, the left sealing ring (32) is arranged between the base plate (31) and the left storage cylinder body (10), and the left air suction joint (34) is communicated with an inner cavity of the left storage cylinder body (10); when the air exhaust sealing assembly (30) is located at the right working position, the right sealing ring (33) is arranged between the base plate (31) and the right storage cylinder body (20), and the right air exhaust connector (35) is communicated with the inner cavity of the right storage cylinder body (20).

3. The mobile sample gas acquisition device of claim 2, wherein: the storage device is characterized by further comprising a top support (40) fixedly arranged on the periphery of the upper ends of the left storage cylinder body (10) and the right storage cylinder body (20), wherein the top support (40) is provided with a left top plate (41) and a right top plate (42) which are arranged oppositely left and right; the air exhaust sealing assembly (30) further comprises a left driving cylinder (36) and a right driving cylinder (37) which are fixedly mounted on the base plate (31), a piston rod of the left driving cylinder (36) can use the left top plate (41) as a motion supporting point to drive the air exhaust sealing assembly (30) to move rightwards, and a piston rod of the right driving cylinder (37) can use the right top plate (42) as a motion supporting point to drive the air exhaust sealing assembly (30) to move leftwards.

4. The mobile sample gas acquisition device of claim 3, wherein: the air exhaust sealing assembly (30) further comprises a sliding block (39) fixed with the base plate (31), a sliding rail (43) extending left and right is fixed on the top support (40), and the sliding block (39) is in sliding fit with the sliding rail (43).

5. The mobile sample gas acquisition device of claim 3, wherein: the air exhaust sealing assembly (30) further comprises a cover plate (310) fixed relative to the base plate (31), a work column signboard (311) is arranged on the upper surface of the cover plate (310), and the cover plate (310) covers the left driving cylinder (36) and the right driving cylinder (37).

6. The mobile sample gas acquisition device of claim 3, wherein: sealing component (30) of bleeding still includes two and fixes locking installation piece (312) at both ends about base plate (31) respectively and dismouting leading truck (38) that two front and back are relative to be set up, be equipped with trip (381) that the interval was arranged about the several on dismouting leading truck (38), the lower limb block of trip (381) and top support (40), the left and right sides of dismouting leading truck (38) all have about extend and with locking installation piece (312) normal running fit's pivot (382), the cover is equipped with the pretension torsional spring on pivot (382), the both ends of pretension torsional spring link to each other with dismouting leading truck (38) and locking installation piece (312) respectively, applys the effort towards top support (40) to dismouting leading truck (38).

7. The mobile sample gas acquisition device of claim 3, wherein: and the left sealing ring (32) and the right sealing ring (33) are both inflatable sealing rings.

8. The mobile sample gas acquisition device of claim 7, wherein: still include compressed air source (50), gas transmission pipeline (60) and set up solenoid valve group (210) on gas transmission pipeline (60), compressed air source (50) are passed through gas transmission pipeline (60) and are driven actuating cylinder (36) on a left side, are driven actuating cylinder (37) on a right side, left sealing washer (32) and right sealing washer (33) and link to each other.

9. The mobile sample gas acquisition device of claim 2, wherein: the lower extreme of left side storage barrel (10) and right storage barrel (20) is fixed with unable adjustment base (70), be fixed with upper portion fixed bolster (80) and lower part fixed bolster (90) that distribute from top to bottom between left side storage barrel (10) and right storage barrel (20).

Technical Field

The invention relates to the field of pressurized water reactor fuel assembly breakage off-line detection, in particular to a movable sampling gas acquisition device for nuclear fuel off-line breakage detection.

Background

The pressurized water reactor fuel assembly damage off-line detection mainly comprises the steps of sipping to detect whether radioactive fission gas such as Xe133, Kr85 and the like exists in a cladding of the fuel assembly, using a sampling gas acquisition device to drive the detection gas to escape from a structural damage part of the fuel assembly, and then transmitting the detection gas to a radioactive activity measurement analysis system at the tail end through an irradiation-resistant air pipe or a stainless steel pipe for detection, so that the damage detection of the fuel assembly is realized.

At present, the sampling gas acquisition devices for acquiring detection gas and providing detection objects for the radioactivity activity measurement and analysis system are all fixed structures, the fixed sampling gas acquisition devices are fixedly installed during the construction of the nuclear power station, and then the nuclear power station which is not provided with the fixed sampling gas acquisition devices in the later stage cannot perform identification and detection on suspected damaged fuel assemblies, so that nuclear power station operators cannot accurately master the structural integrity state of the suspected damaged fuel assemblies, the re-reactor of the suspected damaged fuel assemblies is influenced, and the safe and economic operation of a unit is seriously influenced.

Further, for the nuclear power plant with the fixed sampling gas acquisition device installed during construction, the fixed sampling gas acquisition device has low working frequency, complex maintenance and repair process and can not be used for multiple purposes, so that the fixed sampling gas acquisition device installed in the nuclear power plant does not play an effective role in identifying and detecting suspected damaged fuel assemblies, the input-output ratio of equipment assets is low, and the operation cost of the nuclear power plant is increased.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a portable sampling gas acquiring device for offline damage detection of nuclear fuel, which is used for acquiring a detection gas and does not need to be installed and fixed during the construction of a nuclear power plant.

In order to achieve the purpose, the invention provides a movable sampling gas acquisition device for offline damage detection of nuclear fuel, which comprises a movable storage cylinder body for placing a fuel assembly and a detachable air extraction sealing assembly connected to the upper end of the storage cylinder body, wherein the air extraction sealing assembly comprises a base plate covering the upper end of the storage cylinder body, a sealing ring installed at the lower end of the base plate and an air extraction joint installed on the base plate, the sealing ring is arranged between the base plate and the storage cylinder body, and the air extraction joint is communicated with an inner cavity of the storage cylinder body.

Furthermore, the storage cylinder body is provided with a left storage cylinder body and a right storage cylinder body which are arranged side by side left and right respectively, the air exhaust sealing assembly is installed at the upper ends of the two storage cylinder bodies in a manner of moving left and right, the position of the air exhaust sealing assembly is at least provided with a left working position and a right working position, the sealing rings are provided with a left sealing ring and a right sealing ring which are arranged side by side left and right respectively, and the air exhaust joint is provided with a left air exhaust joint and a right air exhaust joint which are arranged side by side left and right respectively; when the air exhaust sealing assembly is located at the left working position, the left sealing ring is arranged between the base plate and the left storage cylinder body, and the left air exhaust joint is communicated with the inner cavity of the left storage cylinder body; when the air exhaust sealing assembly is located at the right working position, the right sealing ring is arranged between the base plate and the right storage barrel body, and the right air exhaust joint is communicated with the inner cavity of the right storage barrel body.

Further, the movable sampling gas acquisition device also comprises a top support fixedly arranged on the periphery of the upper ends of the left storage cylinder body and the right storage cylinder body, and the top support is provided with a left top plate and a right top plate which are oppositely arranged on the left and the right; the air exhaust sealing assembly further comprises a left driving cylinder and a right driving cylinder which are fixedly mounted on the base plate, a piston rod of the left driving cylinder can use the left top plate as a movement supporting point to drive the air exhaust sealing assembly to move rightwards, and a piston rod of the right driving cylinder can use the right top plate as a movement supporting point to drive the air exhaust sealing assembly to move leftwards.

Further, the air exhaust sealing assembly further comprises a sliding block fixed with the base plate, a sliding rail extending from left to right is fixed on the top support, and the sliding block is in sliding fit with the sliding rail.

Further, the sealing component that bleeds still includes the apron with base plate relatively fixed, be provided with the work column signboard on the upper surface of apron, the apron covers left side and drives actuating cylinder and right side and drive actuating cylinder.

Further, the seal assembly of bleeding still includes two and fixes the locking installation piece at both ends about the base plate respectively and two dismouting leading framves that set up around relatively, the trip that the interval was arranged about being equipped with the several on the dismouting leading framves, the lower limb block of trip and top support, the left and right sides of dismouting leading frame all have about extend and with locking installation piece normal running fit's pivot, the cover is equipped with the pretension torsional spring in the pivot, the both ends of pretension torsional spring link to each other, apply the effort towards the top support with dismouting leading frame and locking installation piece respectively, to the dismouting leading frame.

Further, left sealing washer and right sealing washer all are inflation formula sealing washer.

Further, the movable sampling gas acquisition device further comprises a compressed gas source, a gas delivery pipeline and an electromagnetic valve group arranged on the gas delivery pipeline, wherein the compressed gas source is connected with the left driving cylinder, the right driving cylinder, the left sealing ring and the right sealing ring through the gas delivery pipeline.

Further, the lower extreme of left storage barrel and right storage barrel is fixed with unable adjustment base, be fixed with upper portion fixed bolster and the lower part fixed bolster that distributes from top to bottom between left storage barrel and the right storage barrel.

As described above, the mobile sampling gas acquiring apparatus for offline damage detection of nuclear fuel according to the present invention has the following advantageous effects:

storage barrel in this application is the movable structure, can remove through lifting by crane equipment, and then removes movable gaseous acquisition device integral hoisting for movable gaseous acquisition device of sampling can settle on nuclear power station equipment, through the detachable connection structure between bleed seal assembly and the storage barrel with fuel assembly hoist and mount to storage barrel in, later acquire the testing gas through bleeding the joint. The nuclear power station fuel off-line sipping inspection system is an integrally movable structure, and is not a fixed structure, so that the nuclear power station fuel off-line sipping inspection system does not need to be installed and fixed during the construction of a nuclear power station, can be widely applied to hardware and software architectures with different configuration types, achieves multiple purposes, greatly improves the equipment utilization rate, and reduces the fuel off-line sipping inspection cost of the nuclear power station.

Drawings

Fig. 1 is a schematic structural diagram of a mobile sampling gas acquisition device for a fuel assembly breakage detection system according to the present application.

Fig. 2 is a schematic structural diagram of the mobile sampling gas acquisition device for offline damage detection of nuclear fuel in fig. 1.

FIG. 3 is a schematic view of the pump down seal assembly of FIG. 2.

Description of the element reference numerals

10 left storage cylinder

20 right storage cylinder

30 air extraction sealing assembly

31 base plate

32 left sealing ring

33 right sealing ring

34 left suction joint

35 Right suction connector

36 left driving cylinder

37 right driving cylinder

38 dismounting guide frame

381 hook

382 rotary shaft

39 slide block

310 cover plate

311 work column signboard

312 locking mounting block

313 guide side plate

40 Top support

41 left top plate

42 right top plate

43 slide rail

50 compressed air source

60 gas delivery line

70 fixed base

80 upper fixing support

90 lower fixing support

110 gas processing unit

120 radioactivity activity measuring probe

130 work station

140 gas output line

150 air intake line

160 signal transmission line

170 exhaust line

180 straight-line pipeline

190 spent fuel pool

200 spent fuel storage grillwork

210 solenoid valve group

220 cleaning interface

230 gauge assembly

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

The application relates to a gaseous acquisition device of movable sampling that nuclear fuel off-line damage detected usefulness, this gaseous acquisition device of movable sampling is used for fuel assembly damage detecting system, acquires the testing gas through gaseous acquisition device of movable sampling. The following description will be made of a preferred embodiment of a portable sampling gas acquisition device for offline nuclear fuel breakage detection, taking as an example the fuel assembly breakage detection system for offline pressurized water reactor fuel assembly breakage detection.

As shown in fig. 1, the fuel assembly breakage detection system provided by the present application includes a movable sampling gas acquisition device, a gas processing unit 110, a radioactivity measuring probe 120, and a workstation 130, wherein the movable sampling gas acquisition device is used for acquiring a detection gas and providing a detection object for the radioactivity measuring probe 120. As shown in fig. 2, the mobile sampling gas obtaining device comprises a mobile storage cylinder body used for placing fuel components, and a pumping sealing component 30 which is detachably connected with the upper end of the storage cylinder body; as shown in fig. 3, the pumping seal assembly 30 includes a base plate 31 covering the upper end of the storage cylinder, a seal ring fixedly mounted on the lower end surface of the base plate 31, and a pumping connector fixedly mounted on the base plate 31; when the air exhaust sealing assembly 30 is connected to the upper end of the storage cylinder, the sealing ring is arranged between the substrate 31 and the storage cylinder, so that the substrate 31 and the storage cylinder are in a sealed and isolated state, and the air exhaust joint is communicated with the inner cavity of the storage cylinder. After the movable sampling gas obtaining device is connected to the fuel assembly damage detecting system, as shown in fig. 1, the gas extraction joint of the movable sampling gas obtaining device is connected to the gas processing unit 110 through the gas output pipeline 140, the gas processing unit 110 is connected to the radioactivity measuring probe 120 through the gas inlet pipeline 150, and the radioactivity measuring probe 120 is connected to the workstation 130 through the signal transmission line 160.

When the movable sampled gas acquisition device works normally, the movable sampled gas acquisition device can be integrally moved by utilizing a traveling crane above the spent fuel pool 190 based on the storage cylinder body with a movable structure, so that the movable sampled gas acquisition device is installed on a blank spent fuel storage grid frame 200 in the spent fuel pool 190. The whole air-extracting sealing assembly 30 is detached from the upper end of the storage cylinder, the fuel assemblies in the spent fuel storage grid 200 are lifted out and placed in the storage cylinder, then the whole air-extracting sealing assembly 30 is installed at the upper end of the storage cylinder, and the sealing ring is located between the base plate 31 and the storage cylinder, so that the air-extracting sealing assembly 30 seals the storage cylinder. Then, the detection gas is obtained through the air extraction joint. The detection gas is delivered to the gas processing unit 110 through the gas output line 140, and the gas processing unit 110 filters and dries the detection gas; the filtered and dried detection gas is delivered to the radioactivity measurement probe 120 through the gas inlet pipeline 150, the radioactivity measurement probe 120 detects the detection gas, the detection result is output to the workstation 130 through the signal transmission line 160, and finally, the qualitative evaluation of whether the fuel assembly is damaged is made, so that the offline detection of the damage of the pressurized water reactor fuel assembly is realized. Therefore, the movable sampling gas acquisition device in the application is integrally movable and has a non-fixed structure, the movable sampling gas acquisition device is not required to be installed and fixed during the construction of the nuclear power station, and can be widely applied to hardware and software architectures with different configuration types.

Preferably, the connection interface of the signal transmission line 160 for communicatively connecting the radioactivity measuring probe 120 to the workstation 130 is a USB interface. The radioactivity measuring probe 120 has a detection lumen, a gas inlet and a gas outlet both communicating with the detection lumen, and a signal input interface. As shown in fig. 1, the gas outlet of the radioactivity measuring probe 120 is further connected to an exhaust line 170 and a direct exhaust line 180, the exhaust line 170 is connected between the radioactivity measuring probe 120 and the gas processing unit 110, the detection gas circulates between the radioactivity measuring probe 120 and the gas processing unit 110 through the gas inlet line 150 and the exhaust line 170, so that the radioactivity measuring probe 120 can complete the detection of the detection gas, and the direct exhaust line 180 is connected between the radioactivity measuring probe 120 and the spent fuel pool 190, so that the radioactive detection gas can be directly discharged into the spent fuel pool 190 when the apparatus has a leakage failure.

Further, as shown in fig. 2, the storage cylinder body has two left and right storage cylinder bodies 10 and 20 respectively arranged side by side in the left-right direction, the outer diameter of each of the left and right storage cylinder bodies 10 and 20 is 324 ± 0.05mm, the wall thickness of each of the left and right storage cylinder bodies 10 and 20 is 4.6 ± 0.05mm, and the length of each of the left and right storage cylinder bodies 10 and 20 in the up-down direction is specifically determined according to the type of the fuel assembly. The lower extreme welded fastening of left storage barrel 10 and right storage barrel 20 has unable adjustment base 70, the welded fastening has upper portion fixed bolster 80 between left storage barrel 10 and the upper segment of right storage barrel 20, the welded fastening has lower part fixed bolster 90 between left storage barrel 10 and the right storage barrel 20 hypomere, through unable adjustment base 70, upper portion fixed bolster 80 and lower part fixed bolster 90 realize the structural design of left storage barrel 10 and right storage barrel 20, provide support and the stable function of portable sampling gas acquisition device in operational environment. The structure of adopting two storage barrels can realize that: when the left storage cylinder body 10 is used for fuel assembly breakage off-line detection operation, the right storage cylinder body 20 is in a preparation state; or, when the right storage cylinder 20 is used for the fuel assembly breakage offline detection operation, the left storage cylinder 10 is in a preparation state, so that the detection efficiency and speed of the fuel assembly breakage offline detection are improved, and the fuel assembly breakage offline detection is ensured to be smoothly performed.

Further, the left storage cylinder 10 and the right storage cylinder 20 are arranged side by side left and right, the pumping seal assembly 30 is installed at the upper ends of the left storage cylinder 10 and the right storage cylinder 20 in a manner of moving left and right, and the pumping seal assembly 30 is at least provided with a left working position and a right working position. Correspondingly, as shown in fig. 3, in the pumping seal assembly 30, the seal ring has two left seal ring 32 and right seal ring 33 which are respectively arranged side by side left and right, the pumping joint has two left pumping joint 34 and right pumping joint 35 which are respectively arranged side by side left and right, and both the left pumping joint 34 and the right pumping joint 35 are connected with the gas processing unit 110 through the gas output pipeline 140; when the pumping seal assembly 30 is located at the left working position, as shown in fig. 2, the left sealing ring 32 is disposed between the substrate 31 and the left storage cylinder 10, so that the pumping seal assembly 30 seals the left storage cylinder 10, the left pumping connector 34 is communicated with the inner cavity of the left storage cylinder 10, and the upper end opening of the right storage cylinder 20 is in an open state and is not covered by the pumping seal assembly 30; when the pumping seal assembly 30 is located at the right working position, the right sealing ring 33 is disposed between the base plate 31 and the right storage cylinder 20, so that the pumping seal assembly 30 seals the right storage cylinder 20, the right pumping connector 35 is communicated with the inner cavity of the right storage cylinder 20, and the upper end opening of the left storage cylinder 10 is in an open state and is not covered by the pumping seal assembly 30. Preferably, the left seal ring 32 and the right seal ring 33 are both inflatable seal rings.

Further, the structure for realizing the left and right movement of the pumping sealing assembly 30 is as follows: as shown in fig. 2, the mobile sampling gas acquiring apparatus further includes a top bracket 40 fixedly disposed at the outer periphery of the upper ends of the left and right storage cylinder bodies 10 and 20, the top bracket 40 having a left top plate 41 and a right top plate 42 disposed opposite to each other in the left-right direction and both extending vertically; as shown in fig. 3, the pumping seal assembly 30 further comprises a left driving cylinder 36 and a right driving cylinder 37 both fixedly mounted on the upper end surface of the base plate 31, wherein the left driving cylinders 36 are arranged in two and in front and back, and the right driving cylinders 37 are also arranged in two and in front and back. When the piston rod of the left driving cylinder 36 is in abutting fit with the left top plate 41 and the left top plate 41 is taken as a motion supporting point, the piston rod of the left driving cylinder 36 extends out to drive the substrate 31 to move rightwards, and further drive the whole air suction sealing assembly 30 to move rightwards relative to the top support 40; similarly, when the piston rod of the right driving cylinder 37 is abutted and matched with the right top plate 42 and the right top plate 42 is used as a motion supporting point, the piston rod of the right driving cylinder 37 extends out to drive the base plate 31 to move leftwards, and further drive the whole air exhaust sealing assembly 30 to move leftwards relative to the top bracket 40. The left top plate 41 and the right top plate 42 of the top support 40 are used as supports, and the left driving air cylinder 36 and the right driving air cylinder 37 are used as moving driving sources, so that the air exhaust sealing assembly 30 moves left and right. Preferably, as shown in fig. 2 and 3, the pumping seal assembly 30 further includes a slide block 39 fixed to the base plate 31, a slide rail 43 extending left and right is fixed to the top bracket 40, and the slide block 39 is slidably engaged with the slide rail 43, so that the pumping seal assembly 30 can stably move in the left and right directions.

Further, the structure that the whole detachable connection of the air exhaust sealing assembly 30 at the upper ends of the left storage cylinder body 10 and the right storage cylinder body 20 is realized as follows: as shown in fig. 3, the pumping seal assembly 30 further includes two locking installation blocks 312 respectively fixed at the left and right ends of the substrate 31, and two front and rear oppositely disposed disassembling and assembling guide frames 38; each disassembling and assembling guide frame 38 is provided with a plurality of clamping hooks 381 which are arranged at intervals left and right, and the clamping hooks 381 are clamped with the lower edge of the top support 40; the left side and the right side of the dismounting guide frame 38 are provided with rotating shafts 382 extending left and right, the locking mounting block 312 extends front and back, the rotating shafts 382 of the dismounting guide frame 38 penetrate through the locking mounting block 312 and are in rotating fit with the locking mounting block 312, so that the dismounting guide frame 38 can be rotatably mounted on the locking mounting block 312; moreover, a pre-tightening torsion spring is sleeved on the rotating shaft 382 of the dismounting guide frame 38, and both ends of the pre-tightening torsion spring are respectively connected with the dismounting guide frame 38 and the locking mounting block 312, and apply an acting force towards the top bracket 40 to the dismounting guide frame 38. Under the action of the pre-tightening torsion spring, the dismounting guide frame 38 abuts against the top bracket 40, and the hook 381 of the dismounting guide frame 38 is clamped with the lower edge of the top bracket 40, so that the air-extracting sealing assembly 30 is integrally and movably arranged at the upper ends of the left storage cylinder 10 and the right storage cylinder 20; when a force is applied to the disassembly and assembly guide frame 38, the spring force of the pre-tightening torsion spring is overcome, so that the disassembly and assembly guide frame 38 is turned outwards and upwards in the direction away from the top bracket 40, the clamping between the hook 381 of the disassembly and assembly guide frame 38 and the top bracket 40 is released, and at the moment, the whole air-extracting sealing assembly 30 can be detached from the upper ends of the left storage cylinder 10 and the right storage cylinder 20. Therefore, the rapid disassembly and rapid assembly between the pumping seal assembly 30 and the two storage cylinders can be realized through the disassembly and assembly guide frame 38, and the clamping of the clamping hook 381 and the top bracket 40 can also provide guiding and restraining effects for the left and right movement of the pumping seal assembly 30.

Preferably, as shown in fig. 3, the pumping seal assembly 30 further comprises two cover plates 310 and two guide side plates 313, the two guide side plates 313 are respectively fixed on the left and right sides of the base plate 31, the cover plates 310 are directly fixed to the lock mounting blocks 312, and the lock mounting blocks 312 are directly fixed to the base plate 31, so that the cover plates 310 and the base plate 31 are relatively fixed. An air cylinder installation cavity is formed between the base plate 31 and the cover plate 310, the left driving air cylinder 36 and the right driving air cylinder 37 are both installed in the air cylinder installation cavity and are both covered by the cover plate 310, and the cover plate 310 can effectively protect the left driving air cylinder 36 and the right driving air cylinder 37. In addition, a work column signboard 311 is arranged on the upper surface of the cover plate 310, and the work column signboard 311 is convenient for identifying a work column, in this embodiment, the work column signboard 311 is a column a corresponding to the left storage cylinder 10 and the left suction connector 34, and a column B corresponding to the right storage cylinder 20 and the right suction connector 35, and the left suction connector 34 and the right suction connector 35 both include a small end bayonet coupling air suction connector and a large end bayonet coupling air suction connector.

Further, as shown in fig. 2, the movable sampling gas obtaining apparatus further includes a compressed gas source 50, a gas delivery line 60, and a solenoid valve set 210 disposed on the gas delivery line 60, the compressed gas source 50 is connected to the gas joint of the left driving cylinder 36, the gas joint of the right driving cylinder 37, the gas joint of the left sealing ring 32, and the gas joint of the right sealing ring 33 through the gas delivery line 60, and the solenoid valve set 210 is composed of a plurality of electronic valves. By controlling the opening and closing of each solenoid valve in the solenoid valve group 210, it is possible to: the expansion and contraction of the piston rod of the left driving cylinder 36, the expansion and contraction of the piston rod of the right driving cylinder 37, the inflation and deflation contraction of the left sealing ring 32 and the inflation and deflation contraction of the right sealing ring 33 are controlled, and the left sealing ring 32 and the right sealing ring 33 realize respective sealing functions after inflation. Preferably, the solenoid valve set 210 further includes a pressure regulating valve, the pressure regulating valve is disposed on the gas delivery line 60 connecting the compressed gas source 50 with the left and right sealing rings 32 and 33, and the inflation amount of the left and right sealing rings 32 and 33 can be adjusted by controlling the pressure regulating valve, so as to adjust the degree of expansion of the left and right sealing rings 32 and 33, and further adjust the contact sealing effect between the left sealing ring 32 and the left storage cylinder 10 and the contact sealing effect between the right sealing ring 33 and the right storage cylinder 20.

Preferably, as shown in fig. 2, a cleaning interface 220 is arranged on the fixed base 70, and the movable sampled gas obtaining device is quickly cleaned by connecting the cleaning interface 220 with a three-waste cleaning and filtering system of the nuclear power plant. The upper end of the left storage cylinder 10 and the upper end of the right storage cylinder 20 are respectively provided with a measuring instrument assembly 230, and the measuring instrument assembly 230 is used for acquiring process parameters such as the water temperature of the spent fuel water pool 190 and the liquid level of the coolant in the left storage cylinder 10 and the right storage cylinder 20 in real time during detection, so that the measuring instrument assembly 230 at least comprises a temperature measuring instrument and a liquid level meter. The gauge assembly 230 is communicatively coupled to the control system of the gas processing unit 110 via a signal transmission line 160.

In summary, the working principle of the above-mentioned movable sampling gas obtaining device is as follows:

the movable sampled gas acquisition device can be integrally moved by using a crane above the spent fuel pool 190, so that the movable sampled gas acquisition device is mounted on a blank spent fuel storage grid 200 in the spent fuel pool 190. An acting force is applied to the disassembly and assembly guide frame 38, so that the disassembly and assembly guide frame 38 is turned outwards and upwards, and then the whole air suction sealing assembly 30 is detached from the upper end of the storage cylinder body. The right storage barrel 20 is in a ready state by hanging the fuel assemblies in the spent fuel storage lattice 200 and placing them in the left storage barrel 10. The disassembly and assembly guide frame 38 is clamped on the top support 40, and the air exhaust sealing assembly 30 is integrally installed at the upper ends of the left storage cylinder body 10 and the right storage cylinder body 20. The compressed air source 50 drives the air cylinder 37 to supply air to the right by controlling the electromagnetic valve group 210, and then the piston rod of the right driving air cylinder 37 extends out and is in butt fit with the right top plate 42, so that the driving substrate 31 moves to the left working position. The electromagnetic valve set 210 is controlled to supply air to the left sealing ring 32 from the compressed air source 50, so that the left sealing ring 32 inflates and expands to be sealed between the base plate 31 and the left storage cylinder 10, and finally, the detection air is obtained through the left suction joint 34 corresponding to the column A above the cover plate 310. The detection gas is filtered and dried by the gas processing unit 110 and then is transmitted to the radioactivity measuring probe 120 for detection, the test result is output to the workstation 130, and finally, qualitative evaluation is made on whether the fuel assembly is damaged, so that the damaged pressurized water reactor fuel assembly is detected offline.

The application relates to a movable sampling gas acquisition device has advantages such as simple structure, stable performance, function are perfect, and has the superiority in following four aspects: 1. adaptability: the whole body is a movable structure, and the collected radioactivity detection sample can be widely applied to radioactivity measurement hardware and software structures with different configuration types. 2. Independence: during the working period, only the power plant needs to provide the compressed air source 50, and the compressed air source is not connected with a control and protection system of the nuclear power plant, so that the operation and the maintenance of the power plant are not influenced. 3. Reliability: the fuel assembly is sealed and isolated, and the detection gas is collected, so that the double-row redundancy configuration is adopted, and the failure of any one row can not cause the functional failure of the fuel assembly. 4. High efficiency: the method can effectively solve the problems that a plurality of groups of suspected damage assemblies are re-signed after the nuclear power station is subjected to online sipping detection without a fixed off-line sipping detection system, and the fixed off-line sipping detection system is installed, and has low usability, maintainability, investment income ratio and the like.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.