System for cooling the interior of spent fuel transport containers

Abstract

The present invention discloses a system for cooling the inner cavity of a spent fuel transport container, the system comprising: a gas-liquid separation tank, the inlet of the gas-liquid separation tank is connected to the outlet of the inner cavity of the transport container, the first outlet of the gas-liquid separation tank is connected to the first pipeline; a cooling water treatment system is connected to the second outlet of the gas-liquid separation tank, the inlet of the cooling water treatment system is connected to the second outlet of the gas-liquid separation tank through a second pipeline, the outlet of the cooling water treatment system is connected to the inlet of the inner cavity of the transport container; a first valve is arranged on the first pipeline; a second valve is arranged on the second pipeline; a liquid level detection device is arranged in the gas-liquid separation tank, the liquid level detection device is used to interlock the opening and closing of the first valve and the second valve according to the detected liquid level signal. The system automatically switches the direction of the exhaust and cooling water of the transport container, realizes the automatic switching operation of the exhaust and cooling water when cooling the inner cavity of the transport container, reduces the operation of personnel, and reduces the risk of personnel being irradiated.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear fuel post-processing, and in particular relates to a system for cooling the inner cavity of a spent fuel transport container. Background Art

[0002] After the spent fuel is unloaded from the reactor pool of the nuclear power plant, it is loaded into the spent fuel transport container and transported to the nuclear fuel reprocessing plant. Before the spent fuel is reprocessed, it needs to be stored in the spent fuel pool of the reprocessing plant for a period of time. Due to the decay heat generated by the spent fuel, the temperature of the inner cavity of the transport container can reach 200-300°C. Before unloading, the inner cavity of the transport container needs to be cooled: the transport container is filled with water for cooling. When the water is first filled, the high temperature in the container flashes the cooling water, and the generated high-temperature gas is cooled and introduced into the red-orange zone exhaust system. The cooling water is continuously introduced. When the cooling water completely occupies the space where the original gas exists in the inner cavity of the container, the exhaust is completed, and then the cooling water is continuously introduced to cool the spent fuel assemblies in the inner cavity of the transport container until the temperature of the inner cavity of the transport container drops to 40-50°C.

[0003] The process operation flow of the existing technology is cumbersome. The exhaust and cooling water drainage of the container need to be connected to the transport container separately. The end point of the exhaust in the inner cavity of the container is difficult to control, which is prone to misoperation. The cooling water is likely to enter the process exhaust system and cause damage to the equipment of the exhaust system. Furthermore, when the exhaust pipe and the cooling water pipe at the outlet of the transport container are switched, it is very easy to cause the leakage of radioactive gas, causing the operator to be irradiated. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a system for cooling the inner cavity of a spent fuel transport container in view of the above-mentioned deficiencies in the prior art, which can automatically switch the direction of exhaust and cooling water in the transport container, realize automatic operation of exhausting and filling the inner cavity of the transport container for cooling, and reduce the risk of radiation exposure to personnel.

[0005] The technical solution adopted to solve the technical problem of the present invention is to provide a system for cooling the inner cavity of a spent fuel transport container, wherein the spent fuel transport container comprises: an inner cavity of the transport container, an inner cavity inlet of the transport container arranged on the inner cavity of the transport container, and an inner cavity outlet of the transport container, and the system comprises:

[0006] The gas-liquid separation tank comprises: a gas-liquid separation tank body, a gas-liquid separation tank inlet arranged on the gas-liquid separation tank body, a first gas-liquid separation tank outlet, and a second gas-liquid separation tank outlet; the gas-liquid separation tank inlet is connected to the inner cavity outlet of the transport container, the first gas-liquid separation tank outlet is connected to the first pipeline, the gas-liquid separation tank is used to perform gas-liquid separation on water flowing out of the inner cavity of the transport container, and the first pipeline is used to exhaust gas;

[0007] An exhaust gas treatment system, the inlet of which is connected to the first pipeline, and the exhaust gas treatment system is used to cool and filter the exhaust gas discharged from the cooling water in the inner cavity of the transport container;

[0008] A cooling water treatment system is connected to the second outlet of the gas-liquid separation tank, the inlet of the cooling water treatment system is connected to the second outlet of the gas-liquid separation tank through a second pipeline, and the outlet of the cooling water treatment system is connected to the inlet of the inner cavity of the transport container. The cooling water treatment system is used to provide cooling water required for cooling the transport container, and forms a cooling water cycle with the transport container and the gas-liquid separation tank to continuously cool the inner cavity of the transport container;

[0009] A first valve is disposed on the first pipeline;

[0010] A second valve is disposed on the second pipeline;

[0011] The liquid level detection device is arranged in the gas-liquid separation tank. The liquid level detection device is used to detect the liquid level signal in the gas-liquid separation tank. The liquid level detection device is used to interlock the opening and closing of the first valve and the second valve according to the detected liquid level, and automatically allocate the direction of the logistics in the gas-liquid separation tank for exhaust and cooling.

[0012] Preferably, when the liquid level detection device detects that the liquid level in the gas-liquid separation tank is not higher than the preset liquid level, the interlock first valve is opened and the second valve is closed; when the liquid level detection device detects that the liquid level in the gas-liquid separation tank exceeds the preset liquid level, the interlock first valve is closed and the second valve is opened.

[0013] Preferably, the cooling water treatment system comprises:

[0014] The cooling water tank comprises: a cooling water tank body, a cooling water tank inlet arranged on the cooling water tank body, a cooling water tank outlet, and a cooling water inlet. The cooling water tank inlet is connected to the second valve, the cooling water tank outlet is connected to the inner cavity inlet of the transport container, and the cooling water inlet is used to provide the water source required for cooling to the cooling water treatment system.

[0015] Preferably, the cooling water treatment system further comprises:

[0016] The first cooler is arranged between the gas-liquid separation tank and the cooling water tank. The first cooler is connected to the gas-liquid separation tank and the cooling water tank respectively. Circulating cooling water is passed through the outside of the first cooler to cool the high-temperature water discharged from the inner cavity of the transport container.

[0017] Preferably, the system for cooling the inner cavity of a spent fuel transport container further comprises:

[0018] The cooling water filter is arranged between the gas-liquid separation tank and the cooling water treatment system. The cooling water filter is connected to the gas-liquid separation tank and the cooling water treatment system respectively. A filter core is arranged inside the cooling water filter to filter impurities brought out by the cooling water in the inner cavity of the transport container.

[0019] Preferably, the system for cooling the inner cavity of a spent fuel transport container further comprises:

[0020] The cooling water pump is arranged between the cooling water treatment system and the transport container. The cooling water pump is connected to the cooling water treatment system and the inner cavity outlet of the transport container respectively. The cooling water pump is used to pump the cooling water in the cooling water treatment system into the inner cavity of the transport container.

[0021] Preferably, the exhaust gas treatment system comprises:

[0022] The second cooler is connected to the first valve and is used to cool the high-temperature gas discharged from the first pipeline.

[0023] Preferably, the exhaust gas treatment system further comprises:

[0024] The gas filter is connected to the second cooler. A filter core is arranged inside the gas filter to filter impurities in the exhaust gas.

[0025] Preferably, the height-to-diameter ratio of the gas-liquid separation tank is (1.5-2):1, and the volume ratio of the gas-liquid separation tank to the inner cavity of the transport container is (0.01-0.05):1.

[0026] Preferably, in the system for cooling the inner cavity of a spent fuel transport container, the ratio of the volume of the cooling water tank to the volume of the inner cavity of the transport container is (1.1-1.3):1.

[0027] The advantages of the system for cooling the inner cavity of a spent fuel transport container of the present invention are: (1) the system principle is simple and the number of interfaces of the transport container is small; (2) human operating errors are reduced through automatic control, and circulating water can be prevented from entering the exhaust system; (3) the system makes the process more advanced and efficient, saving operation time; (4) by automatically switching the direction of exhaust and cooling water of the transport container, automatic operation of exhaust and water filling cooling of the inner cavity of the transport container can be realized, reducing the risk of personnel being exposed to radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the system for cooling the inner cavity of a spent fuel transport container in Example 2 of the present invention.

[0029] In the figure: 1-transport container, 2-gas-liquid separation tank, 3-cooling water filter, 4-first cooler, 5-cooling water tank, 6-cooling water pump, 7-second cooler, 8-gas filter, 9-first valve, 10-second valve, 11-pipeline, 12-pipeline, 13-pipeline, 14-pipeline, 15-first pipeline, 16-pipeline, 17-second pipeline, 18-pipeline, 19-pipeline, 20-exhalation and exhaust pipeline, 21-transport container inner cavity inlet, 22-transport container inner cavity outlet, 23-container cooling pit, 24-liquid level detection device. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the attached Figure 1 , wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figure 1 The described embodiments are exemplary and are only used to explain this patent, and should not be understood as limiting this patent.

[0032] Example 1

[0033] This embodiment provides a system for cooling the inner cavity of a spent fuel transport container. The spent fuel transport container includes: an inner cavity of the transport container, an inner cavity inlet of the transport container arranged on the inner cavity of the transport container, and an inner cavity outlet of the transport container. The system includes:

[0034] The gas-liquid separation tank comprises: a gas-liquid separation tank body, a gas-liquid separation tank inlet arranged on the gas-liquid separation tank body, a first gas-liquid separation tank outlet, and a second gas-liquid separation tank outlet, wherein the gas-liquid separation tank inlet is connected to the inner cavity outlet of the transport container, the first gas-liquid separation tank outlet is connected to the first pipeline, the gas-liquid separation tank is used to perform gas-liquid separation on water flowing out of the inner cavity of the transport container, and the first pipeline is used to exhaust gas;

[0035] An exhaust gas treatment system, the inlet of which is connected to the first pipeline, and the exhaust gas treatment system is used to cool and filter the exhaust gas discharged from the cooling water in the inner cavity of the transport container;

[0036] A cooling water treatment system is connected to the second outlet of the gas-liquid separation tank, the inlet of the cooling water treatment system is connected to the second outlet of the gas-liquid separation tank through a second pipeline, and the outlet of the cooling water treatment system is connected to the inlet of the inner cavity of the transport container. The cooling water treatment system is used to provide cooling water required for cooling the transport container, and forms a cooling water cycle with the transport container and the gas-liquid separation tank to continuously cool the inner cavity of the transport container;

[0037] A first valve is disposed on the first pipeline;

[0038] A second valve is disposed on the second pipeline;

[0039] The liquid level detection device is arranged in the gas-liquid separation tank. The liquid level detection device is used to detect the liquid level signal in the gas-liquid separation tank. The liquid level detection device is used to interlock the opening and closing of the first valve and the second valve according to the detected liquid level, and automatically allocate the direction of the logistics in the gas-liquid separation tank for exhaust and cooling.

[0040] The advantages of the system for cooling the inner cavity of a spent fuel transport container in this embodiment are: (1) the system principle is simple and the number of interfaces of the transport container is small; (2) human operating errors are reduced through automatic control, and circulating water can be prevented from entering the exhaust system; (3) the system makes the process more advanced and efficient, saving operation time; (4) the direction of the exhaust and cooling water of the transport container can be automatically switched, and the automatic operation of exhausting the inner cavity of the transport container and filling with water for cooling can be realized, thereby reducing the risk of radiation exposure to personnel.

[0041] Example 2

[0042] like Figure 1 As shown, this embodiment provides a system for cooling the inner cavity of a spent fuel transport container. The spent fuel transport container 1 comprises: an inner cavity of the transport container, an inner cavity inlet of the transport container arranged on the inner cavity of the transport container, and an inner cavity outlet of the transport container. The system comprises:

[0043] The gas-liquid separation tank 2 comprises: a gas-liquid separation tank body, a gas-liquid separation tank inlet arranged on the gas-liquid separation tank body, a first gas-liquid separation tank outlet, and a second gas-liquid separation tank outlet, wherein the gas-liquid separation tank inlet is connected to the inner cavity outlet of the transport container, the first gas-liquid separation tank outlet is connected to the first pipeline 15, the gas-liquid separation tank 2 is used to perform gas-liquid separation on the water flowing out of the inner cavity of the transport container, and the first pipeline 15 is used to exhaust gas;

[0044] An exhaust gas treatment system, the inlet of which is connected to the first pipe 15, and the exhaust gas treatment system is used to cool and filter the exhaust gas discharged from the cooling water in the inner cavity of the transport container;

[0045] A cooling water treatment system is connected to the second outlet of the gas-liquid separation tank, the inlet of the cooling water treatment system is connected to the second outlet of the gas-liquid separation tank through a second pipe 17, and the outlet of the cooling water treatment system is connected to the inlet of the inner cavity of the transport container. The cooling water treatment system is used to provide cooling water required for cooling the transport container 1, and forms a cooling water cycle with the transport container 1 and the gas-liquid separation tank 2 to continuously cool the inner cavity of the transport container;

[0046] A first valve 9 is provided on the first pipeline 15;

[0047] The second valve 10 is disposed on the second pipeline 17;

[0048] The liquid level detection device 24 is arranged in the gas-liquid separation tank 2. The liquid level detection device 24 is used to detect the liquid level signal in the gas-liquid separation tank 2. The liquid level detection device 24 is used to interlock the opening and closing of the first valve 9 and the second valve 10 according to the detected liquid level, and automatically allocate the direction of the logistics in the gas-liquid separation tank 2 for exhaust and cooling.

[0049] Preferably, when the liquid level detection device 24 detects that the liquid level in the gas-liquid separation tank 2 is not higher than the preset liquid level, the interlocked first valve 9 is opened and the second valve 10 is closed; when the liquid level detection device 24 detects that the liquid level in the gas-liquid separation tank 2 exceeds the preset liquid level, the interlocked first valve 9 is closed and the second valve 10 is opened.

[0050] Specifically, the liquid level detection device 24 is arranged in the middle of the gas-liquid separation tank 2. The first valve 9 and the second valve 10 are both pneumatic valves.

[0051] Preferably, the cooling water treatment system comprises:

[0052] The cooling water tank 5 includes: a cooling water tank body, a cooling water tank inlet arranged on the cooling water tank body, a cooling water tank outlet, and a cooling water inlet. The cooling water tank inlet is connected to the second valve 10, and the cooling water tank outlet is connected to the inner cavity inlet of the transport container. The cooling water inlet is used to provide the water source required for cooling to the cooling water treatment system.

[0053] Preferably, the cooling water treatment system further comprises:

[0054] The first cooler 4 is arranged between the gas-liquid separation tank 2 and the cooling water tank 5. The first cooler 4 is connected to the gas-liquid separation tank 2 and the cooling water tank 5 respectively. Circulating cooling water is passed through the outside of the first cooler 4 to cool the high-temperature water discharged from the inner cavity of the transport container.

[0055] Preferably, the system for cooling the inner cavity of a spent fuel transport container further comprises:

[0056] The cooling water filter 3 is arranged between the gas-liquid separation tank 2 and the cooling water treatment system. The cooling water filter 3 is connected to the gas-liquid separation tank 2 and the cooling water treatment system respectively. A filter core is arranged inside the cooling water filter 3 to filter impurities brought out by the cooling water in the inner cavity of the transport container.

[0057] Specifically, in this embodiment, the cooling water filter 3 is disposed between the gas-liquid separation tank 2 and the first cooler 4, and the cooling water filter 3 is connected to the gas-liquid separation tank 2 and the first cooler 4 respectively.

[0058] Preferably, the system for cooling the inner cavity of a spent fuel transport container further comprises:

[0059] The cooling water pump 6 is arranged between the cooling water treatment system and the transport container 1. The cooling water pump 6 is connected to the cooling water treatment system and the inner cavity outlet of the transport container respectively. The cooling water pump 6 is used to pump the cooling water in the cooling water treatment system into the inner cavity of the transport container.

[0060] Specifically, the cooling water pump 6 in this embodiment is disposed between the cooling water tank 5 and the transport container 1 , and the cooling water pump 6 is connected to the cooling water tank 5 and the transport container 1 , respectively.

[0061] Preferably, the exhaust gas treatment system comprises:

[0062] The second cooler 7 is connected to the first valve 9 , and is used to cool the high-temperature gas discharged from the first pipeline 15 .

[0063] Specifically, the second cooler 7 in this embodiment is a jacket cooler.

[0064] Preferably, the exhaust gas treatment system further comprises:

[0065] The gas filter 8 is connected to the second cooler 7. A filter core is provided inside the gas filter 8 to filter impurities in the exhaust gas.

[0066] Preferably, the height-to-diameter ratio of the gas-liquid separation tank is (1.5-2):1, and the volume ratio of the gas-liquid separation tank to the inner cavity of the transport container is (0.01-0.05):1.

[0067] Specifically, in this embodiment, the height-to-diameter ratio of the gas-liquid separation tank is 1.7:1, and the volume ratio of the gas-liquid separation tank to the inner cavity of the transport container is 0.05:1.

[0068] Preferably, in the system for cooling the inner cavity of a spent fuel transport container, the ratio of the volume of the cooling water tank 5 to the volume of the inner cavity of the transport container is (1.1-1.3):1.

[0069] Specifically, in this embodiment, the volume ratio of the cooling water tank 5 to the inner cavity of the transport container is 1.1:1.

[0070] Specifically, there are only two interfaces on the inner cavity of the transport container in this embodiment, namely, the inner cavity inlet of the transport container and the inner cavity outlet of the transport container. The inner cavity inlet of the transport container is connected to the outlet of the cooling water pump 6 through the pipeline 13; the inner cavity outlet of the transport container is both an exhaust port and a cooling water outlet, and the inner cavity outlet of the transport container is connected to the gas-liquid separation tank inlet at the top of the gas-liquid separation tank 2 through the pipeline 14. The gas filter 8 is connected to the process tail gas system through the pipeline 16, and the high-temperature process tail gas flashed out from the inner cavity of the transport container is discharged from the first pipeline 15, and after being cooled by the second cooler 7 and the impurities are removed by the gas filter 8, it is discharged to the process tail gas system through the pipeline 16. The second outlet of the gas-liquid separation tank is connected to the inlet of the cooling water filter through a pipeline 17, and the outlet of the cooling water filter is connected to the inlet of the first cooler through a pipeline 18. The outlet of the first cooler is connected to the inlet of the cooling water tank at the top of the cooling water tank 5 through a pipeline 19. A cooling water inlet is also provided at the top of the cooling water tank 5, and the cooling water inlet is connected to the pipeline 11, and cooling water is introduced through the pipeline 11. The top of the cooling water tank 5 is also connected to an exhalation and exhaust pipeline 20, and the exhalation and exhaust pipeline 20 is used to balance the air pressure of the cooling water tank 5 and the outside. A cooling water tank outlet is provided at the bottom of the cooling water tank 5, and the cooling water tank outlet is connected to the inlet of the cooling water pump 6 through a pipeline 12.

[0071] The equipment pipe opening of the gas-liquid separation tank 2 is used as the boundary, and the logistics flow is divided into two routes: exhaust and cooling circulation. The exhaust pipeline includes: the second cooler 7, the gas filter 8, related pipelines and the first valve 9; the cooling circulation pipeline includes: the cooling water filter 3, the first cooler 4, the cooling water tank 5, the cooling water pump 6 and related pipelines and the second valve 10.

[0072] The cooling water tank 5, the cooling water pump 6 and the related pipeline valves provide the transport container 1 with the cooling circulating water required for the exhaust cooling of the inner cavity of the transport container.

[0073] Specifically, in this embodiment, after the spent fuel transport container 1 is transported to the container cooling pit 23, the quick connectors of the second pipe 17 and the first pipe 15 are respectively connected to the transport container inner cavity inlet and the transport container inner cavity outlet on the transport container 1. The cooling water tank 5 is filled with cooling water in advance. The circulating water of the first cooler 4 and the second cooler 7 has been connected (not shown in the figure). The first valve 9 is opened and the second valve 10 is closed.

[0074] Turn on the cooling water pump 6, and the cooling water enters the transport container 11. The hot air in the inner cavity of the transport container 11 enters the gas-liquid separation tank 2 through the pipe 14. The first outlet of the gas-liquid separation tank is connected to the second cooler 7 through the first pipe 15, and then enters the second cooler 7 through the first pipe 15. After the exhaust gas from the transport container 1 is cooled, it enters the gas filter 8 and is sent to the process exhaust system.

[0075] When the transport container 1 is filled with cooling water, the water enters the gas-liquid separation tank 2 through the pipe 14. At this time, the liquid level signal in the gas-liquid separation tank 2 detects the liquid, and the liquid level signal and the interlocking switch of the first valve 9 and the second valve 10 intervene in the work. The first valve 9 is closed and the second valve 10 is opened. The water is discharged from the bottom of the gas-liquid separation tank 2 and enters the cooling water filter 3 to filter out the particulate matter in the container. After that, it enters the first cooler 4 through the second pipe 17 for cooling. The cooled water enters the cooling water tank 5, and then enters the transport container 1 through the cooling water pump 6, forming a cooling cycle until the inner cavity of the transport container is cooled to the specified temperature.

[0076] After cooling is completed, the quick connectors between pipeline 13 and pipeline 14 and transport container 1 are disconnected to facilitate subsequent process operations.

[0077] The system for cooling the inner cavity of a spent fuel transport container in this embodiment is used to cool the inner cavity of a spent fuel transport container 1 filled with spent fuel assemblies before the spent fuel transport container 1 arrives at a spent fuel receiving and storage facility of a nuclear fuel reprocessing plant for spent fuel unloading, so as to ensure smooth subsequent spent fuel wet unloading.

[0078] The advantages of the system for cooling the inner cavity of the spent fuel transport container in this embodiment are: (1) the system principle is simple and the number of interfaces of the transport container 1 is small; (2) human operating errors are reduced through automatic control, and circulating water can be prevented from entering the exhaust system; (3) the system makes the process more advanced and efficient, saving operation time; (4) by automatically switching the direction of the exhaust and cooling water of the transport container 1, the automatic operation of exhausting the inner cavity of the transport container and filling with water for cooling can be realized, reducing the risk of radiation exposure to personnel.

[0079] Example 3

[0080] This embodiment provides a system for cooling the inner cavity of a spent fuel transport container, which differs from the embodiment 2 in that:

[0081] In this embodiment, the height-to-diameter ratio of the gas-liquid separation tank is 1.5:1, and the volume ratio of the gas-liquid separation tank to the inner cavity of the transport container is 0.03:1.

[0082] In this embodiment, the volume ratio of the cooling water tank to the inner cavity of the transport container is 1.2:1.

[0083] Example 4

[0084] This embodiment provides a system for cooling the inner cavity of a spent fuel transport container, which differs from the embodiment 2 in that:

[0085] In this embodiment, the height-to-diameter ratio of the gas-liquid separation tank is 2:1, and the volume ratio of the gas-liquid separation tank to the inner cavity of the transport container is 0.01:1.

[0086] In this embodiment, the volume ratio of the cooling water tank to the inner cavity of the transport container is 1.3:1.

[0087] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A system for cooling the inner cavity of a spent fuel transport container, the spent fuel transport container comprising: The transport container cavity, the transport container cavity inlet arranged on the transport container cavity, and the transport container cavity outlet, wherein the system comprises: The gas-liquid separation tank comprises: a gas-liquid separation tank body, a gas-liquid separation tank inlet arranged on the gas-liquid separation tank body, a first gas-liquid separation tank outlet, and a second gas-liquid separation tank outlet, wherein the gas-liquid separation tank inlet is connected to the inner cavity outlet of the transport container, and the first gas-liquid separation tank outlet is connected to the first pipeline; An exhaust gas treatment system, the inlet of which is connected to the first pipeline, and the exhaust gas treatment system is used to cool and filter the exhaust gas discharged from the cooling water in the inner cavity of the transport container; A cooling water treatment system is connected to the second outlet of the gas-liquid separation tank, the inlet of the cooling water treatment system is connected to the second outlet of the gas-liquid separation tank through a second pipeline, and the outlet of the cooling water treatment system is connected to the inlet of the inner cavity of the transport container. The cooling water treatment system is used to provide cooling water required for cooling the transport container, and forms a cooling water cycle with the transport container and the gas-liquid separation tank to continuously cool the inner cavity of the transport container; the cooling water treatment system includes: The cooling water tank comprises: a cooling water tank body, a cooling water tank inlet arranged on the cooling water tank body, a cooling water tank outlet, and a cooling water inlet, wherein the cooling water tank inlet is connected to the second valve, the cooling water tank outlet is connected to the inner cavity inlet of the transport container, and the cooling water inlet is used to provide a water source required for cooling to the cooling water treatment system; the cooling water treatment system also comprises: The first cooler is arranged between the gas-liquid separation tank and the cooling water tank. The first cooler is connected to the gas-liquid separation tank and the cooling water tank respectively. The first cooler is connected to the outside of the first cooler with circulating cooling water for cooling the high-temperature water discharged from the inner cavity of the transport container. A first valve is disposed on the first pipeline; A second valve is disposed on the second pipeline; The liquid level detection device is arranged in the gas-liquid separation tank. The liquid level detection device is used to detect the liquid level signal in the gas-liquid separation tank. The liquid level detection device interlocks the opening and closing of the first valve and the second valve according to the detected liquid level signal, and automatically allocates the direction of the logistics in the gas-liquid separation tank.

2. The system for cooling the inner cavity of a spent fuel transport container according to claim 1, characterized in that: When the liquid level detection device detects that the liquid level in the gas-liquid separation tank is not higher than the preset liquid level, the interlock first valve is opened and the second valve is closed; when the liquid level detection device detects that the liquid level in the gas-liquid separation tank exceeds the preset liquid level, the interlock first valve is closed and the second valve is opened.

3. The system for cooling the inner cavity of a spent fuel transport container according to claim 1 or 2, characterized in that: Also includes: The cooling water filter is arranged between the gas-liquid separation tank and the cooling water treatment system. The cooling water filter is connected to the gas-liquid separation tank and the cooling water treatment system respectively. A filter core is arranged inside the cooling water filter to filter impurities brought out by the cooling water in the inner cavity of the transport container.

4. The system for cooling the inner cavity of a spent fuel transport container according to claim 1 or 2, characterized in that: Also includes: The cooling water pump is arranged between the cooling water treatment system and the transport container. The cooling water pump is connected to the cooling water treatment system and the inner cavity outlet of the transport container respectively. The cooling water pump is used to pump the cooling water in the cooling water treatment system into the inner cavity of the transport container.

5. The system for cooling the inner cavity of a spent fuel transport container according to claim 1, characterized in that: The exhaust treatment system includes: The second cooler is connected to the first valve and is used to cool the high-temperature gas discharged from the first pipeline.

6. The system for cooling the inner cavity of a spent fuel transport container according to claim 5, characterized in that: The exhaust treatment system also includes: The gas filter is connected to the second cooler. A filter core is arranged inside the gas filter to filter impurities in the exhaust gas.

7. The system for cooling the inner cavity of a spent fuel transport container according to any one of claims 1, 2, 5 and 6, characterized in that: The height-to-diameter ratio of the gas-liquid separation tank is (1.5-2):1, and the volume ratio of the gas-liquid separation tank to the inner cavity of the transport container is (0.01-0.05):

1.

8. The system for cooling the inner cavity of a spent fuel transport container according to claim 1, characterized in that: The volume ratio of the cooling water tank to the inner cavity of the transport container is (1.1-1.3):1.

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