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Off-line sipping detection system and method for spent fuel assembly

A detection system and spent fuel technology, applied in the field of off-line sipping detection system for spent fuel components, can solve the problems of short detection time and failure to satisfy spent fuel components, and achieve the effects of short detection time, high degree of automation and simple operation

Pending Publication Date: 2021-06-04
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing technology and spent fuel damage inspection system cannot satisfy the problem that the spent fuel assembly can not only take water samples by wet method, but also take dry gas samples for damage inspection, the invention provides an off-line sip detection of spent fuel assemblies The system integrates two off-line leak detection methods, wet method and dry method, which can not only complete the collection of characteristic nuclides dissolved in water, but also complete the collection of gaseous characteristic nuclides dissolved in water. Off-line leak detection can be performed on all kinds of breaches, shutdown time, dry and wet fuel assemblies and fuel rods, and the detection time is short, the detection accuracy is high, the degree of automation is high, and the operation is simple

Method used

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  • Off-line sipping detection system and method for spent fuel assembly

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Effect test

Embodiment 1

[0026] like figure 1 As shown, the specific steps of the detection system of the present invention for wet off-line sipping detection are as follows:

[0027] 1) Step 1: System preparation and system flushing. Before washing, it is necessary to open the top cover of the sipping chamber through the pump station and hydraulic cylinder, open the valves W01, W02, and W03, and use deionized water to flush the top and bottom of the water circuit ;Open H01, H02, G09, G10, G11, G12, close H03, G03 valves, use compressed air to purge and clean the top and bottom of the air circuit respectively;

[0028] 2) Step 2: Open the valves H01, H02, and H03, and inflate the heat shield with compressed air to form a heat shield between the sipping chamber and the pool water, and then inflate the top and bottom of the air circuit;

[0029] 3) Step 3: put the spent fuel assembly to be inspected into the sipping chamber, and close the sipping chamber cover through the pump station and hydraulic cyl...

Embodiment 2

[0039] like figure 1 As shown, the specific steps of the detection system of the present invention for dry off-line sipping detection are as follows:

[0040] 1) Step 1: Prepare the system and put the spent fuel assembly to be inspected into the sip chamber, and close the sip chamber cover through the pump station and hydraulic cylinder;

[0041] 2) Step 2, drain the system, open the H01, H02, G01, G09, G10 valves, close the H03, G11, W01, W03, G04 valves, remove the quick connectors connected to the W03, G04 valves at the lower end of the sip, and feed the compressed air Air, to drain water from the air circuit and sip chamber;

[0042] 3) Step 3: After the water in the gas circuit and the sip chamber is completely drained, connect the quick connectors at the lower end of the sip to the valves W03 and G04, so that the spent fuel assembly is sealed in the sip chamber and stored dry for a certain period of time;

[0043] 4) Step 4, open the G01, G03, G06, G07 valves, close th...

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Abstract

The invention discloses an off-line sipping detection system and a method for a spent fuel assembly. The off-line sipping detection system comprises a sipping chamber, wherein a top cover of the sipping chamber is connected with a water pressure cylinder and a pump station; also comprises a water circulating pump, an electric heater, and a water cooler, wherein the sipping chamber is sequentially connected with the water circulating pump, the electric heater and the water cooler through pipelines to form a water loop; also comprises an air cooler, an air circulating pump, and an air flow beta detector, wherein the sipping chamber is sequentially connected with the air cooler, the air circulating pump and the air flow beta detector through pipelines to form an air loop; the sipping chamber is also connected with a deionized water injection pipeline and a compressed air injection pipeline; the water loop is externally connected with a water sampling pipeline and a resin tank pipeline respectively, and the gas loop is externally connected with a suction pipeline formed by connecting an 85Kr trapping device and a vacuum pump in series. The off-line sipping detection system integrates two off-line leak detection methods of a wet method and a dry method, can collect characteristic nuclides dissolved in water, and also can collect gaseous characteristic nuclides dissolved in water.

Description

technical field [0001] The invention relates to the technical field of nuclear industry detection, in particular to an off-line sipping detection system and method for spent fuel assemblies. Background technique [0002] Before the spent fuel assembly is returned to the reactor for reuse or shipped out, the integrity of the cladding needs to be inspected, that is, the damage inspection. At present, nuclear power plants, research reactors, etc., use the water cycle flushing sampling method to check the damage of spent fuel assemblies for fuel assemblies that cannot be dehydrated and stored for a short time out of the reactor; The spent fuel assembly is stored and pumped for damage inspection. Existing technologies and spent fuel damage inspection systems are unable to meet the requirements for spent fuel assemblies to be able to take both wet water samples and dry gas samples for damage inspection. Contents of the invention [0003] In order to solve the problem that the ...

Claims

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Application Information

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IPC IPC(8): G21C17/04G21C17/06
CPCG21C17/042G21C17/06Y02E30/30
Inventor 吴瑞罗文广张先萌魏甫李成业刘晓松王亚军王万金刘豪郑海川吴旭
Owner NUCLEAR POWER INSTITUTE OF CHINA