A remotely controllable fuel assembly detection system and method

Abstract

The application discloses a kind of fuel assembly detection system and method of remote control in fuel assembly breakage detection technical field, including sipping tank and gas circulation loop, two ends of gas circulation loop are communicated with sipping tank respectively, first steam-water separator, gas circulation pump, temperature controller and detector are sequentially provided on gas circulation loop along the direction of flow of gas to be detected;Wherein, temperature controller includes the cooling section for condensing the water in gas to be detected and the heating section for heating the water in gas to be detected, second steam-water separator is provided on the gas circulation loop between cooling section and heating section.The application adopts the way of coarse filtration and fine filtration, uses twice steam-water separation to completely filter out the water in gas to be detected, reduces the influence of water on detection accuracy, and uses temperature controller to heat the water in gas to be detected, guarantees the quantitative detection accuracy of gas to be detected.

Description

Technical Field

[0001] This invention relates to the field of fuel assembly damage detection technology, specifically to a remotely controllable fuel assembly detection system and method. Background Technology

[0002] Offline detection of pressurized water reactor fuel assemblies is mainly carried out by sipping to detect whether the cladding of the fuel assembly contains radioactive fission gases such as Xe133 and Kr85. A sampling gas acquisition device is used to drive the detection gas out from the structural damage of the fuel assembly and accumulate at the top of the sipping canister. Then, the detection gas is transported to the downstream radioactivity measurement system through a gas circulation loop for detection, thereby realizing the evaluation of the damaged fuel assembly.

[0003] Patent CN111354488A discloses a vacuum offline slurping detection device and method for nuclear fuel assemblies. This method utilizes vacuum negative pressure to first allow gas to escape from the fuel assembly, and then uses a detector to quantitatively detect the radioactivity of the gas. However, through long-term production activities, the inventors have discovered the following shortcomings in existing offline slurping detection methods:

[0004] 1. The temperature and moisture content of the gas to be detected are two factors that affect the detection accuracy. When using a detector to quantitatively detect the radioactivity of a gas, the temperature of the gas to be detected is required to be maintained at 40℃. However, at this temperature, it is difficult to completely filter out the moisture in the gas to be detected using a gas-water separator, so the detection accuracy cannot reach the ideal level.

[0005] 2. The gas escaping from the fuel assembly is radioactive. This radioactive gas enters the detector used to detect radioactivity through the gas circulation loop, causing the detector to also become radioactive. This means that even when not in use, the gas in the gas circulation loop will also be radioactive. If this part of the gas leaks into the room, it can easily cause workers to be exposed to radiation.

[0006] 3. When purging the gas circulation loop, the purging pipeline is connected to the gas circulation loop upstream of the gas circulation pump, so the entire gas circulation loop can be purged. This results in a longer purging time and reduces the detection efficiency of the fuel assembly.

[0007] 4. According to usage requirements, the detection systems used in nuclear power plants all need to be equipped with a certain number of valves to control the gas circulation loop. The control of the valves requires on-site operation by personnel, which will result in personnel being exposed to a certain dose of radiation, increasing the risk of radiation. At the same time, due to the relative complexity of the detection system and the large number of valves, if the operators do not have a deep understanding of the operating procedures or do not follow the procedures, it will lead to detection failure. In severe cases, it will lead to the release of radioactive gas into the room, which can easily cause exposure to workers. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide a remotely controllable fuel assembly detection system to solve the technical problem of unsatisfactory detection accuracy of existing detection systems.

[0009] The technical solution adopted in this invention is: a remotely controllable fuel assembly detection system, comprising:

[0010] Sipping can;

[0011] A gas circulation loop, wherein the air inlet of the gas circulation loop is connected to the air outlet of the sipping can, and the air outlet is connected to the air inlet of the sipping can.

[0012] A gas circulation pump is installed in the gas circulation loop to drive the gas to be detected to flow within the gas circulation loop.

[0013] The first gas-water separator is installed on the gas circulation loop upstream of the gas circulation pump and is used to coarsely filter the moisture in the gas to be tested.

[0014] A temperature controller is installed in the gas circulation loop downstream of the gas circulation pump, and includes a cooling section for condensing the gas to be tested and a heating section for heating the gas to be tested.

[0015] The second steam-water separator is installed in the gas circulation loop between the cooling section and the heating section, and is used to finely filter the moisture in the condensed gas to be tested.

[0016] The detector is installed in the gas circulation loop downstream of the temperature controller and is used to quantitatively detect the gas to be tested after the moisture has been filtered out.

[0017] Preferably, the detection system further includes a purge gas supply line, one end of which is connected to a long-stroke purge branch, and the other end of which is connected to a gas circulation loop upstream of the gas circulation pump. The long-stroke purge branch is provided with a first purge isolation valve for controlling the on / off state of the long-stroke purge branch, which is used to purge the gas to be detected in the gas circulation loop over a long stroke.

[0018] Preferably, the purge gas supply line is also connected to one end of the short-stroke purge branch, and the other end of the short-stroke purge branch is connected to the gas circulation loop upstream of the detector. The short-stroke purge branch is provided with a second purge isolation valve for controlling the on / off of the short-stroke purge branch, which is used to purge the gas to be detected in the gas circulation loop in a short stroke.

[0019] Preferably, the detection system further includes an instrument air supply line, which is connected to a second air supply branch and a third air supply branch. The other end of the second air supply branch is connected to a first purge isolation valve, and a second solenoid valve is provided on the second air supply branch. The other end of the third air supply branch is connected to the second purge isolation valve, and a third solenoid valve is provided on the third air supply branch. The second and third solenoid valves are interlocked to allow one of the long-stroke purge branch and the short-stroke purge branch to be opened.

[0020] Preferably, the instrument air supply line is also connected to one end of the first air supply branch, and the other end of the first air supply branch is connected to the first pneumatic isolation valve at the air inlet end and the second pneumatic isolation valve at the air outlet end of the gas circulation loop. The first air supply branch is provided with a first solenoid valve for controlling the synchronous operation of the first pneumatic isolation valve and the second pneumatic isolation valve.

[0021] Preferably, the detection system further includes an exhaust gas bypass and a bypass valve. The exhaust gas bypass is connected to the gas circulation loop downstream of the detector and is provided with a third pneumatic isolation valve for the exhaust of the gas to be detected in the gas circulation loop. The bypass valve is arranged in parallel with the detector on the gas circulation loop and has a connection position for allowing the gas to be detected to flow to the detector and a bypass position for allowing the detected gas to flow to the exhaust gas bypass.

[0022] Preferably, the instrument air supply line of the detection system is also connected to one end of the fifth air supply branch, and the other end of the fifth air supply branch is connected to the third pneumatic isolation valve. Furthermore, the fifth air supply branch is equipped with a fifth solenoid valve for controlling the state of the third pneumatic isolation valve.

[0023] Preferably, the instrument air supply line of the detection system is also connected to one end of the fourth air supply branch. The bypass valve is a two-position four-way pneumatic valve and is connected in series in the fourth air supply branch. The fourth air supply branch is provided with a fourth solenoid valve for controlling the gas flow direction in the fourth air supply branch.

[0024] Another object of the present invention is to provide a remotely controllable fuel assembly detection method, wherein the method uses the above-mentioned detection system and the method includes the following steps:

[0025] S10: Place the fuel assembly into the sipping can and seal it;

[0026] S20: Introduce industrial gas from the bottom of the canister into the canister to form an air chamber at the top of the canister;

[0027] S30: Open the first pneumatic isolation valve, the second pneumatic isolation valve, the gas circulation pump, and the third pneumatic isolation valve on the exhaust bypass in the gas circulation circuit to perform a vacuuming operation on the suction can.

[0028] S40: Close the third pneumatic isolation valve on the exhaust bypass and use a detector to quantitatively detect the gas to be tested that has undergone two gas-liquid separations in the gas circulation loop.

[0029] S50: Close the first pneumatic isolation valve, the second pneumatic isolation valve, and the gas circulation pump on the gas circulation loop, and open the first purge isolation valve on the long-stroke purge branch or the second purge isolation valve on the short-stroke purge branch, as well as the third pneumatic isolation valve on the exhaust gas bypass, to purge the gas to be tested in the gas circulation loop with either a long-stroke or short-stroke purge.

[0030] Preferably, S50 includes: when the detector detects that the gas to be detected in the gas circulation loop exceeds the standard, opening the first purge isolation valve on the long-stroke purge branch to purge the gas to be detected in the gas circulation loop over a long stroke; when the detector detects that the gas to be detected in the gas circulation loop does not exceed the standard, opening the second purge isolation valve on the short-stroke purge branch to purge the gas to be detected in the detector over a short stroke.

[0031] The beneficial effects of this invention are:

[0032] 1. This invention employs a combination of coarse and fine filtration. First, the first steam-water separator removes moisture from the gas to be tested in the gas circulation loop. Then, the cooling section of the temperature controller condenses the coarsely filtered gas, liquefying the water vapor within it. This improves the secondary fine filtration effect of the second steam-water separator, achieving complete removal of moisture and reducing its impact on detection accuracy. Finally, the heating section of the temperature controller heats the finely filtered gas, maintaining it at the optimal detection temperature and ensuring the quantitative detection accuracy of the gas.

[0033] 2. This invention employs a two-stage purging method, with a long-stroke purging branch and a short-stroke purging branch connected in the gas circulation loop. The long-stroke purging branch can be used to purge the gas circulation loop with excessive radioactivity, while the short-stroke purging branch can be used to purge the gas circulation loop with normal radioactivity. This greatly shortens the purging time of the gas circulation loop and improves the detection efficiency.

[0034] 3. The present invention adopts a parallel isolation method, setting a two-position four-way bypass valve in the gas circulation loop, and setting the detector and the bypass valve in parallel. This not only enables the type measurement of gas radioactivity, but also isolates the detector to prevent the leakage of radioactive gas inside the detector.

[0035] 4. This invention includes separate instrument gas supply and purging gas supply systems. The instrument gas supply is used only for supplying gas to various types of solenoid valves and pneumatic valves; the discharged gas does not contain radioactive waste gas and can be directly vented. The purging gas supply is used for purging the pipelines within the system; the generated waste gas contains radioactivity and needs to be discharged into a designated radioactive waste gas containment device. Simultaneously, pressure relief valves are installed in both the purging gas supply pipeline and the gas circulation loop to release pressure within the system after operation, with the gas discharged into the radioactive waste gas containment device. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the remotely controllable fuel assembly detection system of the present invention;

[0037] Figure 2 This is a schematic diagram of the detection system of the present invention in a vacuum state;

[0038] Figure 3 This is a schematic diagram of the detection system of the present invention in the detection state;

[0039] Figure 4 This is a schematic diagram of the detection system of the present invention in a long-stroke purging state;

[0040] Figure 5 This is a schematic diagram of the detection system of the present invention in a short-stroke purging state.

[0041] Explanation of the reference numerals in the figure:

[0042] 100. Gas circulation loop;

[0043] 110. Gas circulation pump; 120. First steam-water separator; 130. Temperature controller; 140. Second steam-water separator; 150. Detector; 160. Bypass valve;

[0044] 101. First pneumatic isolation valve; 102. Second pneumatic isolation valve;

[0045] 200. Purge the gas supply lines;

[0046] 210. Long-stroke purge branch; 211. First purge isolation valve; 220. Short-stroke purge branch; 221. Second purge isolation valve;

[0047] 300. Instrument air supply pipeline;

[0048] 310, First gas supply branch; 311, First solenoid valve; 320, Second gas supply branch; 321, Second solenoid valve; 330, Third gas supply branch; 331, Third solenoid valve; 340, Fourth gas supply branch; 341, Fourth solenoid valve; 350, Fifth gas supply branch; 351, Fifth solenoid valve;

[0049] 400. Exhaust gas emission bypass;

[0050] 410. Third pneumatic isolation valve. Detailed Implementation

[0051] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0052] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] Examples, such as Figures 1-5 As shown, a remotely controllable fuel assembly detection system includes:

[0056] A sipping canister (also called a sipping cylinder) has an inner cavity for holding a fuel assembly, an air outlet communicating with the inner cavity at the top of the sipping canister, and an air inlet communicating with the inner cavity at the bottom.

[0057] A gas circulation loop 100 is provided, wherein the air inlet of the gas circulation loop 100 is sealed and connected to the air outlet of the sipping can via a hose, and the air outlet is sealed and connected to the air inlet of the sipping can via a hose.

[0058] A gas circulation pump 110 is provided on the gas circulation loop 100 to drive the gas to be detected to flow from the inlet end of the gas circulation loop 100 to the outlet end of the gas circulation loop 100.

[0059] A first gas-water separator 120 is provided on the gas circulation loop 100 upstream of the gas circulation pump 110 for coarse filtration of moisture in the gas to be tested.

[0060] A temperature controller 130 is installed on the gas circulation loop 100 downstream of the gas circulation pump 110, and includes a cooling section and a heating section. The cooling section is used to condense the coarsely filtered gas to be tested so that the water vapor in the gas to be tested is liquefied. The heating section is used to heat the condensed gas to be tested so that the gas to be tested is kept at the optimal detection temperature.

[0061] A second steam-water separator 140 is installed on the gas circulation loop 100 between the cooling section and the heating section. It is used to finely filter the moisture in the condensed gas to be tested, so as to completely remove the moisture from the gas to be tested.

[0062] A detector 150 is installed on the gas circulation loop 100 downstream of the temperature controller 130 for quantitative detection of the radioactivity of the gas to be tested after the moisture has been filtered out.

[0063] This application employs a combination of coarse and fine filtration. First, the first vapor-water separator 120 removes moisture from the gas to be tested within the gas circulation loop 100. Then, the cooling section of the temperature controller 130 condenses the coarsely filtered gas to liquefy the water vapor within it. This, combined with the secondary fine filtration of the liquid in the gas by the second vapor-water separator 140, achieves complete removal of moisture from the gas, reducing the impact of moisture on the accuracy of gas radioactivity detection. Finally, the heating section of the temperature controller 130 heats the finely filtered gas, maintaining it at the optimal detection temperature and improving the quantitative detection accuracy of the gas radioactivity.

[0064] In one specific embodiment, such as Figure 1 , Figure 4As shown, the detection system also includes a purge gas supply line 200, which is connected to one end of a long-stroke purge branch 210, and the other end of the long-stroke purge branch 210 is connected to a gas circulation loop 100 upstream of the gas circulation pump 110. A first purge isolation valve 211 is provided on the long-stroke purge branch 210. The first purge isolation valve 211 is used to control the opening and closing of the long-stroke purge branch 210. After the fuel assembly detection is completed, the purge gas in the purge gas supply line 200 flows into the upstream of the gas circulation loop 100 by opening the first purge isolation valve 211, so as to realize the long-stroke purge of the gas to be tested in the gas circulation loop 100. This configuration is because, after the fuel assembly testing is completed, in order to avoid the influence of the previous test gas on the radioactivity accuracy of the next test gas, it is necessary to exhaust all the test gas in the gas circulation loop 100. In this embodiment, after the long-stroke purging branch 210 is connected to the upstream of the gas circulation loop 100, the gas in the gas circulation loop 100 can be exhausted to the radioactive waste gas containment device through the purging gas in the long-stroke purging branch 210.

[0065] Preferred, such as Figure 5 As shown, the purge gas supply line 200 is also connected to one end of the short-stroke purge branch 220, and the other end of the short-stroke purge branch 220 is connected to the gas circulation loop 100 upstream of the detector 150. A second purge isolation valve 221 is provided on the short-stroke purge branch 220. The second purge isolation valve 221 is used to control the opening and closing of the short-stroke purge branch 220. After the fuel assembly detection is completed, the purge gas in the purge gas supply line 200 flows into the gas circulation loop 100 upstream of the detector 150 by opening the second purge isolation valve 221, so as to realize the short-stroke purge of the gas to be detected in the gas circulation loop 100. This design is based on the following reasoning: In actual production, the long-stroke purging branch 210 has a relatively long purging path, resulting in reduced purging pressure downstream of the gas circulation loop 100. This leads to a longer purging time for the entire long-stroke purging operation, consequently resulting in lower fuel assembly detection efficiency. However, if the gas to be detected inside the gas circulation loop 100 is within acceptable limits, it is only necessary to purge the detector 150 to the background level. By connecting the short-stroke purging branch 220 to the gas circulation loop 100 upstream of the detector 150, this application allows for direct short-stroke purging of the detector 150 via the short-stroke purging branch 220, significantly shortening the purging operation time and improving fuel assembly detection efficiency.

[0066] More preferably, such as Figures 1-5As shown, the detection system includes an instrument air supply line 300, which connects to a second air supply branch 320 and a third air supply branch 330. The other end of the second air supply branch 320 is connected to a first purge isolation valve 211. A second solenoid valve 321 is provided on the second air supply branch 320 to control the on / off state of the second air supply branch 320, thereby controlling the flow direction of the gas within the second air supply branch 320. The other end of the third air supply branch 330 is connected to the second purge isolation valve 221. A third solenoid valve 331 is provided on the third air supply branch 330 to control the on / off state of the third air supply branch 330, thereby controlling the flow direction of the gas within the third air supply branch 330. The second solenoid valve 321 and the third solenoid valve 331 are interlocked so that only one of the long-stroke purge branch 210 and the short-stroke purge branch 220 can be opened at a time. This configuration is based on the following: By connecting the second gas supply branch 320 to the first purge isolation valve 211 and installing a second solenoid valve 321 on the second gas supply branch 320, the first purge isolation valve 211 can be automatically controlled, thereby enabling remote opening and closing of the first purge isolation valve 211. Similarly, by connecting the third gas supply branch 330 to the second purge isolation valve 221 and installing a third solenoid valve 331 on the third gas supply branch 330, the second purge isolation valve 221 can be automatically controlled, thereby enabling remote opening and closing of the second purge isolation valve 221. Interlocking the second solenoid valve 321 and the third solenoid valve 331 allows for selective opening of long-stroke and short-stroke purge operations, preventing misoperation and eliminating the recirculation of purge gas within the gas circulation loop 100.

[0067] Further optimized, such as Figures 1-5 As shown, the instrument gas supply line 300 is also connected to one end of the first gas supply branch 310, and the other end of the first gas supply branch 310 is connected to the first pneumatic isolation valve 101 at the inlet end and the second pneumatic isolation valve 102 at the outlet end of the gas circulation loop 100. Simultaneously, a first solenoid valve 311 is provided on the first gas supply branch 310 to control the synchronous operation of the first pneumatic isolation valve 101 and the second pneumatic isolation valve 102, and the first solenoid valve 311 is interlocked with the second solenoid valve 321 and the third solenoid valve 331. This arrangement is because by connecting the first gas supply branch 310 to the first pneumatic isolation valve 101 and the second pneumatic isolation valve 102, and by providing the first solenoid valve 311 on the first gas supply branch 310, automated control of the first pneumatic isolation valve 101 and the second pneumatic isolation valve 102 can be achieved, thereby enabling the remote synchronous opening and closing of the first pneumatic isolation valve 101 and the second pneumatic isolation valve 102 to avoid radioactive gas leakage due to misoperation.

[0068] In one specific embodiment, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the detection system also includes an exhaust gas bypass 400 and a bypass valve 160. The exhaust gas bypass 400 is connected to the gas circulation loop 100 downstream of the detector 150 and is provided with a third pneumatic isolation valve 410. The third pneumatic isolation valve 410 is used to control the on / off state of the exhaust gas bypass 400 so as to realize the exhaust of gas in the gas circulation loop 100. The bypass valve 160 is arranged in parallel with the detector 150 and has a connection position for allowing the gas to be detected to flow to the detector 150 and a bypass position for allowing the gas to be detected to flow to the exhaust gas bypass 400. This setup is because during vacuuming, testing, and purging operations, detector 150 needs to be connected to gas circulation loop 100 to allow gas to flow through it. However, when not in use, detector 150, which has been in contact with the gas to be tested for a long time, is also radioactive. Continuing to connect detector 150 to gas circulation loop 100 would make the gas in gas circulation loop 100 also radioactive, posing a risk of radioactive gas leakage. Furthermore, gas circulation loop 100 needs to be purged again before the next test, affecting the testing efficiency of the fuel assembly. However, by connecting the bypass position of the bypass valve 160 to the gas circulation loop 100, the detector 150 can be isolated, making the detector 150 and the gas circulation loop 100 non-connected. This not only reduces the risk of radioactive gas leakage, but also allows for short-stroke purging of the detector 150 through the short-stroke purging branch 220, shortening the purging time of the gas circulation loop 100 and thus improving the detection efficiency of the fuel assembly. At the same time, during the isolation of the detector 150, it is convenient to maintain and replace the detector 150.

[0069] Preferred, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the instrument air supply line 300 of the detection system is also connected to one end of the fifth air supply branch 350, and the other end of the fifth air supply branch 350 is connected to the third pneumatic isolation valve 410. A fifth solenoid valve 351 is provided on the fifth air supply branch 350. The fifth solenoid valve 351 is used to control the opening and closing of the third pneumatic isolation valve 410, thereby controlling the flow of gas in the exhaust bypass 400. This is because connecting the fifth air supply branch 350 to the third pneumatic isolation valve 410 and providing the fifth solenoid valve 351 on the fifth air supply branch 350 allows for the remote opening and closing of the third pneumatic isolation valve 410 through the automatic control of the fifth solenoid valve 351.

[0070] More preferably, such as Figure 1As shown, the instrument air supply line 300 of the detection system is also connected to one end of the fourth air supply branch 340. The bypass valve 160 is a two-position four-way pneumatic valve. The control end of the two-position four-way pneumatic valve is connected in series on the fourth air supply branch 340. A fourth solenoid valve 341 is provided on the fourth air supply branch 340. The fourth solenoid valve 341 is used to control the flow of gas in the fourth air supply branch 340, thereby controlling the connection state between the bypass valve 160 and the gas circulation loop 100, realizing the connection and isolation between the detector 150 and the gas circulation loop 100.

[0071] Examples, such as Figures 2-5 As shown, a remotely controllable fuel assembly detection method uses the aforementioned detection system and includes the following steps:

[0072] Preparation before testing:

[0073] Check and ensure that the instrument air supply line 300 and the purging air supply line 200 are supplying air normally.

[0074] The first steam-water separator 120, the second steam-water separator 140, and the temperature controller 130 are turned on in advance.

[0075] S10: Place the fuel assembly into the sipping canister, and use a computer to control the solenoid valve group via PLC to interlock the actuators of the sipping canister, filling the sipping canister with water and sealing it.

[0076] S20: Introduce industrial gas into the sucking can from the bottom, drain some of the water inside the sucking can, and form an air chamber of appropriate volume at the top of the sucking can.

[0077] The pressure gauge and pressure transmitter on the instrument air supply line 300 display pressure information locally in real time, and also display the pressure information on the computer. The pressure of the instrument air supply line 300 is regulated by the pressure regulating valve to protect the starting equipment.

[0078] S30: By opening the first solenoid valve 311 on the first gas supply branch 310, the first pneumatic isolation valve 101 and the second pneumatic isolation valve 102 on the gas circulation circuit 100 are opened; by opening the fifth solenoid valve 351 on the fifth gas supply branch 350, the third pneumatic isolation valve 410 on the exhaust gas bypass 400 is opened; by controlling the fourth solenoid valve 341 on the fourth gas supply branch 340 to connect the bypass valve 160 to the gas circulation circuit 100, the gas circulation pump 110 on the gas circulation circuit 100 is finally turned on to perform a vacuuming operation on the suction can, so as to establish a vacuum inside the suction can.

[0079] The pressure gauge and pressure transmitter on the gas circulation loop 100 are in the open state, monitoring the pressure of the gas circulation loop 100 and displaying it locally, as well as on the computer software interface for remote control.

[0080] S40: Once the required vacuum level for detection is established, the third pneumatic isolation valve 410 on the exhaust bypass 400 is closed via the fifth solenoid valve 351 on the fifth gas supply branch 350, so as to establish a complete gas circulation path between the inlet and outlet of the suction can, and the detector 150 is used to quantitatively detect the gas to be detected in the gas circulation loop 100 after two gas-water separations.

[0081] The downstream of the gas circulation loop 100 is equipped with a flow regulating valve, which is used to control the gas flow rate in the gas circulation loop 100 and monitor it through a flow meter, while also feeding back to the computer software interface for remote control.

[0082] S50: After completing the testing of a set of fuel components, the gas circulation loop 100 and detector 150 need to be purged to reduce the gas dose in the gas circulation loop 100 to the background level. First, the first pneumatic isolation valve 101 and the second pneumatic isolation valve 102 on the gas circulation loop 100 are closed through the first solenoid valve 311 on the first gas supply branch 310, disconnecting the gas circulation loop 100 from the aspiration canister, and the gas circulation pump 110 is turned off.

[0083] When the detector 150 detects that the gas to be detected in the gas circulation loop 100 exceeds the standard, it controls the second solenoid valve 321 of the second gas supply branch 320 to open the first purge isolation valve 211 on the long stroke purge branch 210, and at the same time opens the third pneumatic isolation valve 410 on the exhaust gas bypass 400 through the fifth solenoid valve 351 on the fifth gas supply branch 350. By introducing purge gas upstream of the gas circulation loop 100, the long stroke purge of the gas to be detected in the gas circulation loop 100 is achieved.

[0084] When the detector 150 detects that the gas to be detected in the gas circulation loop 100 is within the standard, it controls the third solenoid valve 331 of the third gas supply branch 330 to open the second purge isolation valve 221 on the short-stroke purge branch 220, and at the same time opens the third pneumatic isolation valve 410 on the exhaust gas bypass 400 through the fifth solenoid valve 351 on the fifth gas supply branch 350. By introducing purge gas into the gas circulation loop 100 upstream of the detector 150, the gas to be detected in the detector 150 is purged in a short stroke.

[0085] The pressure gauge and pressure transmitter on the purging gas supply line 200 can display pressure information locally and on the computer software interface, and the pressure of the purging gas supply line 200 can be adjusted through the pressure regulating valve.

[0086] After purging for the specified time, repeat steps S10 to S50 to begin the inspection of the next set of fuel assemblies.

[0087] Compared with the prior art, this application has at least the following beneficial technical effects:

[0088] 1. This application can reduce personnel exposure dose by remotely controlling the fuel assembly detection system.

[0089] 2. This application achieves automated control through a program, which can improve work efficiency.

[0090] 3. This application implements interlocking actions of various actuators through a program, which can reduce human error and safety risks.

[0091] 4. In this application, the instrument gas supply and purging gas supply are physically isolated, which can reduce the emission of radioactive waste gas.

[0092] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A remotely controllable fuel assembly detection system, characterized by, include: Sipping can; A gas circulation loop (100) is provided, wherein the inlet end of the gas circulation loop (100) is connected to the outlet end of the sipping can, and the outlet end is connected to the inlet end of the sipping can. A gas circulation pump (110) is provided on a gas circulation loop (100) for driving the gas to be detected to flow within the gas circulation loop (100); The first gas-water separator (120) is installed on the gas circulation loop (100) upstream of the gas circulation pump (110) and is used to coarsely filter the moisture in the gas to be tested. Temperature controller (130) is installed on the gas circulation loop (100) downstream of the gas circulation pump (110), and includes a cooling section for condensing the gas to be tested and a heating section for heating the gas to be tested. The second steam-water separator (140) is installed on the gas circulation loop (100) between the cooling section and the heating section, and is used to finely filter the moisture in the condensed gas to be tested. The detector (150) is located on the gas circulation loop (100) downstream of the temperature controller (130) and is used to quantitatively detect the gas to be tested after the moisture has been filtered out.

2. A remotely controllable fuel assembly detection system in accordance with claim 1, wherein, The detection system also includes a purge gas supply line (200), which is connected to one end of a long-stroke purge branch (210). The other end of the long-stroke purge branch (210) is connected to a gas circulation loop (100) upstream of the gas circulation pump (110). The long-stroke purge branch (210) is provided with a first purge isolation valve (211) for controlling the opening and closing of the long-stroke purge branch (210) and for performing long-stroke purge of the gas to be detected in the gas circulation loop (100).

3. The remotely controllable fuel assembly detection system according to claim 2, characterized in that, The purge gas supply line (200) is also connected to one end of the short-stroke purge branch (220), and the other end of the short-stroke purge branch (220) is connected to the gas circulation loop (100) upstream of the detector (150). The short-stroke purge branch (220) is provided with a second purge isolation valve (221) for controlling the opening and closing of the short-stroke purge branch (220) and for performing short-stroke purge on the gas to be detected in the gas circulation loop (100).

4. The remotely controllable fuel assembly detection system according to claim 3, characterized in that, The detection system also includes an instrument air supply line (300), which is connected to a second air supply branch (320) and a third air supply branch (330). The other end of the second air supply branch (320) is connected to a first purge isolation valve (211), and a second solenoid valve (321) is provided on the second air supply branch (320). The other end of the third air supply branch (330) is connected to a second purge isolation valve (221), and a third solenoid valve (331) is provided on the third air supply branch (330). The second solenoid valve (321) and the third solenoid valve (331) are interlocked so that one of the long-stroke purge branch (210) and the short-stroke purge branch (220) can be opened.

5. The remotely controllable fuel assembly detection system according to claim 4, characterized in that, The instrument air supply line (300) is also connected to one end of the first air supply branch (310), and the other end of the first air supply branch (310) is connected to the first pneumatic isolation valve (101) at the air inlet end and the second pneumatic isolation valve (102) at the air outlet end of the gas circulation loop (100). The first air supply branch (310) is provided with a first solenoid valve (311) for controlling the first pneumatic isolation valve (101) and the second pneumatic isolation valve (102) to operate synchronously.

6. The remotely controllable fuel assembly detection system according to claim 1, characterized in that, The detection system also includes an exhaust gas bypass (400) and a bypass valve (160). The exhaust gas bypass (400) is connected to the gas circulation loop (100) downstream of the detector (150) and is provided with a third pneumatic isolation valve (410) for the exhaust of the gas to be detected in the gas circulation loop (100). The bypass valve (160) is arranged in parallel with the detector (150) on the gas circulation loop (100) and has a connection position for the gas to be detected to flow to the detector (150) and a bypass position for the gas to be detected to flow to the exhaust gas bypass (400).

7. The remotely controllable fuel assembly detection system according to claim 6, characterized in that, The instrument air supply line (300) of the detection system is also connected to one end of the fifth air supply branch (350), and the other end of the fifth air supply branch (350) is connected to the third pneumatic isolation valve (410). The fifth air supply branch (350) is provided with a fifth solenoid valve (351) for controlling the state of the third pneumatic isolation valve (410).

8. The remotely controllable fuel assembly detection system according to claim 6, characterized in that, The instrument air supply line (300) of the detection system is also connected to one end of the fourth air supply branch (340). The bypass valve (160) is a two-position four-way pneumatic valve and is connected in series on the fourth air supply branch (340). The fourth air supply branch (340) is equipped with a fourth solenoid valve (341) for controlling the gas flow direction in the fourth air supply branch (340).

9. A remotely controllable method for detecting fuel assemblies, characterized in that, The method uses the detection system according to any one of claims 1-8, and the method includes the following steps: S10: Place the fuel assembly into the sipping can and seal it; S20: Introduce industrial gas from the bottom of the canister into the canister to form an air chamber at the top of the canister; S30: Open the first pneumatic isolation valve (101), the second pneumatic isolation valve (102), the gas circulation pump (110), and the third pneumatic isolation valve (410) on the exhaust bypass (400) on the gas circulation circuit (100) to perform a vacuuming operation on the sucking can. S40: Close the third pneumatic isolation valve (410) on the exhaust gas bypass (400), and use the detector (150) to quantitatively detect the gas to be detected in the gas circulation loop (100) after two steam-water separations; S50: Close the first pneumatic isolation valve (101), the second pneumatic isolation valve (102) and the gas circulation pump (110) on the gas circulation loop (100), and open the first purge isolation valve (211) on the long stroke purge branch (210) or the second purge isolation valve (221) on the short stroke purge branch (220) and the third pneumatic isolation valve (410) on the exhaust gas bypass (400) to purge the gas to be tested in the gas circulation loop (100) with a long stroke or a short stroke.

10. The remotely controllable fuel assembly detection method according to claim 9, characterized in that, S50 includes: when the detector (150) detects that the gas to be detected in the gas circulation loop (100) exceeds the standard, opening the first purge isolation valve (211) on the long-stroke purge branch (210) to purge the gas to be detected in the gas circulation loop (100) for a long stroke; when the detector (150) detects that the gas to be detected in the gas circulation loop (100) does not exceed the standard, opening the second purge isolation valve (221) on the short-stroke purge branch (220) to purge the gas to be detected in the detector (150) for a short stroke.

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