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Reactor pool cleaning method used for miniature neutron source reactor decommissioning

A cleaning method and pool pool technology, applied in the field of reactor engineering, can solve the problems of waste mixing and taking up a lot of time, and achieve the effect of reducing cleaning, avoiding waste mixing, and reducing time

Inactive Publication Date: 2013-09-18
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is necessary to measure and classify each piece of stripped waste, which takes a lot of time. There is a certain degree of mixing in the stripped waste, and some non-radioactive waste becomes secondary radioactive waste due to contamination by radioactive waste.

Method used

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  • Reactor pool cleaning method used for miniature neutron source reactor decommissioning
  • Reactor pool cleaning method used for miniature neutron source reactor decommissioning
  • Reactor pool cleaning method used for miniature neutron source reactor decommissioning

Examples

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Effect test

Embodiment 1

[0029] The present invention is used for the cleaning of the bottom of the Jinan heap pool, and the bottom of the Jinan heap pool is as follows Figure 4 As shown, the big circle is the bottom of the reactor pool, and the small circle is the projection of the reactor core on the bottom of the pool. When stripping the bottom of the pool, according to this method, the demarcation point between low release and release control is determined from both horizontal and vertical directions. In this embodiment, the vertical direction is taken as an example for illustration.

[0030] The release value of the reactor is required to be 60 Co specific activity is 30Bq / kg, 152 The specific activity of Eu is 100Bq / kg.

[0031] The design rated power of Jinan micro-reactor is 30kW, corresponding to the thermal neutron flux density of the inner irradiation seat is 1×10 12 n·cm ‐2 ·s ‐1 .

[0032] The first step: theoretical calculation:

[0033] Check the operation records of the Jinan ...

Embodiment 2

[0058] The present embodiment is the same as Embodiment 1, and its difference is that adopt this method to find the demarcation point in the horizontal direction at a distance of 90 cm from the projection center of the core at the bottom of the pool, and the demarcation point depth at 40 cm from the center is 40 cm, and the distance from the center is 40 cm. The depth of the demarcation point at 70cm is 15cm, and the peeling is carried out according to the above demarcation point. The section of the debonding part is as follows: Figure 5 shown.

[0059] During the decommissioning process of Jinan micro-pile, the total amount of waste cleaned by this method was 3.1 cubic meters, compared with 6.9 cubic meters of waste treated by other existing cleaning methods, the volume was reduced by more than half, and the secondary waste was greatly reduced. amount of radioactive waste.

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Abstract

The invention discloses a reactor pool cleaning method used for miniature neutron source reactor decommissioning. The method includes the following steps: (1), theoretically calculating demarcation points of low level waste and deregulated waste; (2) sampling two points within the demarcation points for gamma spectrum analysis to acquire radioactive nuclide specific activity; (3), reasoning positions of the demarcation points according to nuclide specific activity and the position thereof; (4), sampling at positions closed to the outer sides of the demarcation points for gamma spectrum analysis to acquire radioactive nuclide specific activity; (5), comparing the acquired activity with a deregulating value, if the activity is smaller than the deregulating value, determining the positions to be the interface of the deregulating waste and the low level waste, peeling the portion within the positions and cleaning, and if the activity is larger than the deregulating value, repeating step (3) and (4) until the acquired activity is smaller than the deregulating value, and cleaning. By the method, sampling and measuring while peeling can be realized, secondary radioactive waste quantity can be reduced, and measuring workload and classifying time of radioactive waste can be reduced.

Description

technical field [0001] The invention relates to the technical field of reactor engineering, in particular to a method for cleaning a reactor water pool used for micro-reactor decommissioning. Background technique [0002] Since the first micro-reactor was built in my country in 1984, there have been 9 micro-reactors at home and abroad. The operating life of the micro-needle is 20 years. After a long period of operation, the bottom and wall of the micro-neutral pool are activated by neutrons, resulting in certain radioactivity in this part. During the decommissioning process of the micro-needle, it is necessary to clean up the part whose radioactivity exceeds the release level. [0003] At present, the method of cleaning the pool during the decommissioning process of the micro reactor is: use a pick to strip the tiles, cement, steel bars, etc. on the wall and bottom of the pool, measure the stripped waste, and classify them according to their radioactivity . The disadvantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/178G21F9/28
Inventor 李义国张永保彭旦吴小波
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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