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Method for detecting leakage of solid gadolinium neutron poison rod

A detection method and the technology of poison rods, which are applied in the field of radioactivity detection, can solve the problems of long time consumption, complicated detection operation, insufficient reliability and effectiveness, etc., and achieve the effects of short time consumption, high detection sensitivity and reliable detection

Pending Publication Date: 2022-01-11
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a detection method for the leakage of solid gadolinium neutron poison rods, which has the advantages of high detection sensitivity, simple operation and no need to stop work, and solves the problems existing in the existing technology. In the existing technology, the detection of solid neutron poison leakage is complicated, time-consuming, and the reliability and effectiveness of detection are seriously insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a method for detecting the leakage of a solid gadolinium neutron poison rod, comprising the following steps:

[0024] 1) Sampling the radioactive material liquid;

[0025] 2) separating the gadolinium element in the sample;

[0026] 3) analyzing and detecting the isotopic abundance of gadolinium-157 in the sample;

[0027] 4) During the in-service inspection, repeat steps 1)-3), if the isotope abundance of gadolinium-157 in the sample is higher than the preset operating threshold, it is judged that the solid gadolinium neutron poison rod in the radioactive material liquid has leaked into the radioactive liquid. Otherwise, it is judged that the solid gadolinium neutron poison rod in the radioactive material liquid has not leaked into the radioactive material liquid.

[0028] The detection method for solid gadolinium neutron poison rod leakage proposed in this example is based on the analysis method of gadolinium-157 isotope abundance, which ha...

Embodiment 2

[0030] This embodiment is the leak detection of the solid gadolinium neutron poison rod in the dissolver of the spent fuel reprocessing plant, which can be used for the critical control of the homogeneous solution produced by the burnup of spent fuel with a burnup depth of 20-55GWd / tU.

[0031] This embodiment provides a method for detecting the leakage of a solid gadolinium neutron poison rod, comprising the following steps:

[0032] 1) Sampling the radioactive material liquid, the radioactive material liquid is the case of using solid neutron poison to control nuclear criticality risk, specifically, in this embodiment, a small amount is taken out through an automatic sampling cabinet in a dissolver or a solution receiving storage tank The solution sample is the radioactive feed solution.

[0033] 2) Separating the gadolinium element in the sample, using an extraction chromatographic column for separation. The uranium, plutonium and other split elements in the sample are rem...

Embodiment 3

[0052] This embodiment provides a detection method for the leakage of a solid gadolinium neutron poison rod, and the difference from the detection method in Embodiment 2 is:

[0053] The radioactive feed liquid is a homogeneous radioactive feed liquid containing fissile substances and having the risk of nuclear criticality produced by the spent fuel reprocessing process. High-concentration plutonium solution storage tank for the plutonium line second cycle at the head end of the spent fuel reprocessing process.

[0054] In step 5) of this embodiment, the preset operating threshold of the isotopic abundance of gadolinium-157 is twice the background value of the isotopic abundance of gadolinium-157 in the radioactive material liquid.

[0055] It should be noted that, in this embodiment, the preset operating threshold in step 5) is 0.1%.

[0056] It should be noted that the protective sleeve in this embodiment is made of zirconium alloy.

[0057] The detection method for the le...

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Abstract

The invention discloses a method for detecting leakage of a solid gadolinium neutron poison rod. The method comprises the following steps: 1) sampling radioactive feed liquid; 2) separating a gadolinium element in the sample; (3) analyzing and detecting the isotope abundance of gadolinium-157 in a sample; and 4) during in-service inspection, repeating the steps 1)-3), and if the isotope abundance of the gadolinium-157 in the sample is higher than a preset operation threshold value, judging that the solid gadolinium neutron poison bar in the radioactive feed liquid is leaked into the radioactive feed liquid. The method for detecting leakage of the solid gadolinium neutron poison rod is based on an analysis method of gadolinium-157 isotope abundance, has the advantages of high detection sensitivity, simplicity in operation, reliability in detection, short time consumption and no need of shutdown, and guarantees nuclear critical safety of a spent fuel post-treatment process.

Description

technical field [0001] The invention belongs to the technical field of radiation detection, and in particular relates to a detection method for the leakage of a solid gadolinium neutron poison rod. Background technique [0002] Nuclear criticality safety is the primary prerequisite for the utilization of nuclear energy. The use of solid neutron poisons to keep fissile substances in a subcritical safe state is one of the most common methods of criticality control. The reprocessing source items of spent fuel are complex in composition and high in radioactivity. Wet reprocessing of spent fuel requires the use of a dissolver to dissolve fissile nuclides in spent fuel assemblies. The dissolver uses a solid gadolinium neutron poison rod plus a titanium alloy sleeve as a protective sleeve to control critical reactivity. Long-term immersion of solid neutron poisons in high-temperature, strong radiation, and strong acid solutions has the risk of corrosion and leakage of the protec...

Claims

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Application Information

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IPC IPC(8): G21C17/00
CPCG21C17/002Y02E30/30
Inventor 聂哲吴志强侯留东陈勇马敬刘权卫王志强
Owner CHINA NUCLEAR POWER ENG CO LTD