Detection method for damage of nuclear power plant spent fuel assemblies
A detection method and technology for spent fuel, applied in the field of nuclear power, can solve the problems of unfavorable spent fuel assembly integrity detection and judgment, low inert gas release, low work efficiency, etc. easy effect
Active Publication Date: 2022-03-15
中广核工程有限公司 +3
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[0009] However, the Kr-85 leak detection method heats the airtight container and spent fuel assembly to 80°C ± 10°C, and stores them at heat preservation for 40 hours. The low temperature of the spent fuel assembly is not conducive to the release of inert gas in the assembly to the airtight container through the damaged gap; heat preservation It takes a long time to store for 40 hours, and its work efficiency is low; in addition, the gamma ray yield of Kr-85 is only 0.43%. Using gamma energy spectroscopy, its detection limit is high, which is not conducive to the integrity of damaged spent fuel assemblies Detection and Judgment
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[0039] In order to make the purpose, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.
[0040] Please refer tofigure 1 and figure 2 As shown, the detection method for the damage of nuclear power plant spent fuel assembly of the present invention comprises the following steps:
[0041] In the first step, the heat-insulating airtight cylinder 10 is placed in the fuel pool of the fuel building of the nuclear power plant, and deionized water is injected into the fuel pool;
[0042] In the second step, the spent fuel assembly 13 stored and cooled for more than 2 years in the fuel pool is put into the heat-insulating and airtight cylinde...
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The invention discloses a method for detecting the damage of spent fuel assemblies in nuclear power plants, which comprises the following steps: 1) placing a heat-insulating and airtight cylinder in a fuel pool, and injecting deionized water into the fuel pool; 2) storing and cooling the fuel pool for 2 Put spent fuel assemblies over one year old into the heat-insulating and airtight cylinder, and cover the heat-insulating and airtight cylinder with a top cover; 3) Inflate and drain the heat-insulating and airtight cylinder, and maintain pressure for leak detection; 4) Vacuumize the heat-insulating and airtight cylinder, Heating and heat preservation; and 5) sampling from the heat-insulating airtight cylinder, and completing the Kr-85 radioactive concentration detection through a gas radioactive concentration measuring device provided with a pressure-resistant β sensitive detector. Compared with the prior art, the detection method for the damage of nuclear power plant spent fuel assembly of the present invention accelerates the release of Kr-85 in the spent fuel assembly and increases the Kr-85 by vacuumizing the heat-insulating airtight cylinder, electric heating and pressurized measurement technology of Kr-85 radioactive concentration. ‑85 total activity, improve the measurement accuracy of Kr‑85 radioactivity concentration, and accurately judge the integrity of spent fuel components.
Description
technical field [0001] The invention belongs to the technical field of nuclear power, and more specifically, the invention relates to a method for detecting damage of nuclear power plant spent fuel assemblies. Background technique [0002] A large number of spent fuel assemblies are stored in the fuel pool of nuclear power plants, and most of the spent fuel assemblies will be damaged during long-term storage and cooling in the fuel pool. At this time, the radioactive fission nuclides and fission gases in the spent fuel assembly will enter the fuel pool through the damaged gap, directly causing the increase of the radioactive activity of the fuel pool and the increase of the airborne radioactive concentration of the fuel operation plant, which is harmful to the internal radiation protection of the nuclear power plant. produce adverse effects. [0003] At present, there are mainly online sip inspection and offline sip inspection of fuel pool for the integrity inspection of sp...
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IPC IPC(8): G21C17/04
CPCG21C17/04Y02E30/30
Inventor 陈小强熊军杨寿海魏学虎贾运仓
Owner 中广核工程有限公司