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Alpha contamination measurement flow in overhaul process of fuel defective unit of mega-kilowatt nuclear power plant

A technology for nuclear power plants and fuels, used in nuclear engineering, nuclear power generation, nuclear reactor monitoring, etc., to improve safety and prevent alpha pollution incidents

Active Publication Date: 2016-02-03
DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of α pollution measurement process in the overhaul of the defective fuel unit of a million-kilowatt nuclear power plant in view of the deficiencies in the prior art. Timely and effective measurement, and taking certain protective measures for personnel according to the measurement results, effectively prevent the occurrence of ground and personnel α pollution incidents, and greatly improve the safety during the overhaul of the fuel unit of the million-kilowatt nuclear power plant

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  • Alpha contamination measurement flow in overhaul process of fuel defective unit of mega-kilowatt nuclear power plant

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Embodiment 1

[0029] Such as figure 1 As shown, the α-pollution measurement process in the overhaul of fuel-deficient units in a million-kilowatt nuclear power plant in this embodiment includes the following steps:

[0030] 1) Level 1 measurement: track and measure the radioactive chemical indicators of the operating units of the million-kilowatt nuclear power plant. The radioactive level of iodine-134 in the primary loop is above the set primary risk threshold, indicating that the primary loop system has a potential risk of alpha radiation contamination, and further secondary measurement is required; if the radioactive level of iodine-134 in the primary loop is found If it is less than the first-level risk threshold, implement protective measures that do not have the risk of α-radiation pollution;

[0031] 2) Secondary measurement: Open the top cover of the pressure vessel and measure the α pollution on the upper and inner surfaces of the top cover. If the detection finds that the average...

Embodiment 2

[0048] In this embodiment, the safety protection system SAS is preferably a negative pressure or static SAS, which encloses the area with the risk of alpha radiation pollution and effectively prevents the occurrence of ground pollution incidents; the respiratory protection device is a gas mask or a full face mask , the additional protective equipment includes paper clothes, plastic gloves and plastic shoe covers, effectively preventing the occurrence of personnel pollution incidents.

Embodiment 3

[0050] In this embodiment, the first-level measurement, the second-level measurement, and the third-level measurement all include the measurement of the surface of the equipment in contact with the fluid in the primary circuit, and the measurement of α radiation pollution on the surface of the equipment in contact with the fluid in the primary circuit is conducive to timely detection of the presence of The risk of α-radiation pollution can be improved, and the timeliness and comprehensiveness of α-pollution measurement can be improved.

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Abstract

The invention relates to the technical field of detection and protection of nuclear pollution, in particular to an alpha contamination measurement flow in the overhaul process of a fuel defective unit of a mega-kilowatt nuclear power plant. The alpha contamination measurement flow is characterized in that radioactive chemical indicators of an operating unit of the mega-kilowatt nuclear power plant are subjected to tracking measurement by primary measurement, secondary measurement and teriary measurement; different protective measures are selected according to alpha contamination radioactive levels obtained by various-stage measurement. According to the alpha contamination measurement flow disclosed by the invention, in the overhaul process of the fuel defective unit of the mega-kilowatt nuclear power plant, whether the alpha contamination exists or not can be timely and effectively measured, and certain protective measures for persons are adopted according to measurement result, so that the incidence of alpha contamination events of ground and the persons is effectively prevented, and the safety in the overhaul process of the fuel defective unit of the mega-kilowatt nuclear power plant is greatly improved.

Description

technical field [0001] The invention relates to the technical field of nuclear pollution detection and protection, in particular to an α-pollution measurement process in the overhaul of a fuel-deficient unit of a million-kilowatt nuclear power plant. Background technique [0002] During the operation of a mega-kilowatt nuclear power plant, when the fuel assembly is defective, the fission products contained in the fuel rods will enter the main circuit, and the gaseous fission products will be released into the reactor building through the boundary of the main circuit, causing air radiation pollution. Moreover, during refueling and overhaul, these fission products are easier to release with the opening of the main circuit, and a large amount of airborne radionuclides will leave the main circuit and enter the working environment of maintenance personnel, increasing the radiation level of the site and the risk of internal exposure of personnel. In France, when the fuel assembly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/00
CPCY02E30/30
Inventor 高兴伦振明李博袁伟苏亮亮徐强李锐孙焕玉武慧园黄新明张震宛小飞张峥峥
Owner DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT