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Radiation protective control method for repairing damaged spent fuel assembly of mega-kilowatt nuclear power plant

A radiation protection and control method technology, applied in nuclear power generation, nuclear engineering, nuclear reactor monitoring, etc., can solve problems such as air pollution to other environments, accidental breakage, pollution, etc., and achieve the effect of reducing radiation risk and preventing accidental release

Active Publication Date: 2016-02-03
DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the accidental release of radioactive substances during the restoration process will bring great radiation risks to these workers. The spread of radioactive substances into the surrounding environment will cause serious air pollution and other environmental pollution. At the same time, the related equipment used in the restoration process surface contamination
For example, when the spent fuel assembly is hoisted out of the water, the radioactive material will suddenly increase the radiation level at the work site due to the loss of water shielding; when the spent fuel rod or spent fuel assembly is spot-checked or hoisted, it may cause accidental breakage, causing the radioactive material to Released to the fuel plant; in addition, improper operation by operators will also cause radioactive substances to spread to the ground of the plant, causing ground and personnel pollution, etc.
[0004] Therefore, radiation protection in the repair process of damaged spent fuel assemblies is very important, but there is no effective radiation protection method in the prior art

Method used

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  • Radiation protective control method for repairing damaged spent fuel assembly of mega-kilowatt nuclear power plant
  • Radiation protective control method for repairing damaged spent fuel assembly of mega-kilowatt nuclear power plant

Examples

Experimental program
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Effect test

Embodiment 1

[0036] see figure 1 , a radiation protection control method for repairing damaged spent fuel components of a million-kilowatt nuclear power plant proposed in Embodiment 1, which mainly includes the following steps S100 to S400:

[0037] S100, performing a leak test and ultrasonic or eddy current inspection on the damaged spent fuel assembly.

[0038] In the step S100, the leak test on the damaged spent fuel assembly includes online or offline leak test, which can determine whether the fuel rods in the spent fuel assembly are damaged and roughly locate the damaged position, and the ultrasonic or eddy current inspection can be used for The location of the damage can be precisely located, and the degree of damage such as the size of the breach can be determined.

[0039] S200. Analyze the radiation source item according to the test result and the inspection result.

[0040] In step S100 , the amount of the radiation source item can be estimated by performing a sip test and ultr...

Embodiment 2

[0047] Please continue to combine figure 1The difference between the radiation protection control method for repairing damaged spent fuel components of a mega-kilowatt nuclear power plant proposed in Embodiment 2 and Embodiment 1 is only that each step from Step S100 to Step S400 in Embodiment 1 is further specified, and closer to current practice.

[0048] Step S100 specifically includes: S110, according to the on-line or off-line sip test and ultrasonic or eddy current inspection on the damaged spent fuel assembly, locate the damaged fuel rod and the damaged position, and determine the degree of damage.

[0049] The step S200 specifically includes: S210, analyzing which radiation source items exist in the damaged spent fuel group, and estimating the amount of each radiation source item based on the damage location and damage degree.

[0050] Further, the step S200 may further include: S220, evaluating the impact of the radiation source items on the workers and the environme...

Embodiment 3

[0059] see figure 2 The radiation protection control method for the repair of damaged spent fuel components of a mega-kilowatt nuclear power plant proposed in the third embodiment is based on the first or second embodiment for further optimization and supplementation. Specifically, based on the first embodiment For example, the third embodiment also includes the following steps S500 and S600:

[0060] S500. After the repair of the damaged spent fuel assembly is completed, perform the leak test and ultrasonic or eddy current inspection again to confirm that the repair is qualified.

[0061] During the test and inspection process of step S500, radiation protection should pay special attention to the operation of related equipment after use, and continuous measurement should be carried out to ensure that the radiation level does not exceed the preset value, otherwise the equipment needs to be dropped into the water again and wait for flushing Treatment; after the equipment is o...

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Abstract

The invention relates to a radiation protective control method for repairing a damaged spent fuel assembly of a mega-kilowatt nuclear power plant. The radiation control method comprises the following steps of A1, carrying out sipping test and ultrasonic or eddy current inspection on the damaged spent fuel assembly; A2, analyzing a radiative source term according to the test result and the inspection result; A3, developing a radiation protective optimized action form and a control point document according to the analysis result of the radiative source term, and finishing the work of a radiation protective control document; A4, performing the radiation protective control in the repairing process of the damaged spent fuel assembly on the basis of the radiation protective control document. According to the radiation protective control method disclosed by the invention, standardized operation can be realized by combining practical experience and adopting scientific and reasonable radiation protective means, so that accidental release of radioactive substances in the repairing process of the damaged spent fuel assembly is prevented, and radiation risk for operators is reduced.

Description

technical field [0001] The invention relates to the field of radiation protection of nuclear power plant spent fuel assemblies, in particular to a radiation protection control method for damaged spent fuel assemblies of mega-kilowatt nuclear power plants during the repair process, so as to prevent radioactive material accidents during the repair process of damaged spent fuel assemblies release, and reduce the radiation risk to workers. Background technique [0002] A certain number of spent fuel assemblies of mega-kilowatt nuclear power plants will be damaged during their service life. These damaged spent fuel assemblies need to be repaired in order to be put into use again. During the repair process, operators with different responsibilities are required to carry out division of labor. Generally speaking, the operators include: operators who are responsible for hoisting and repairing spent fuel components, chemical personnel who conduct inspection and analysis before and af...

Claims

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Application Information

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IPC IPC(8): G21C17/04G21D3/04
CPCY02E30/00Y02E30/30
Inventor 周智慧武慧园杨俊武
Owner DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT
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