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A cleaning device for damaged fuel assemblies

A fuel assembly and cleaning device technology, which is applied in nuclear engineering, radioactive purification, etc., can solve problems such as not seen, and achieve the effects of improving utilization rate, good cleaning effect, and avoiding diffusion

Active Publication Date: 2018-04-20
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the removal of damaged fuel assembly sticky sodium, there is no published relevant literature so far

Method used

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  • A cleaning device for damaged fuel assemblies

Examples

Experimental program
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Effect test

Embodiment 1

[0023] as attached figure 1 As shown, the cleaning device for damaged fuel assemblies of the present invention includes an outer cylinder 1, an inner cylinder 2, a partition 3, an overflow pipe 4, a breathing pipe 5 and a suspension tube 6; the outer cylinder 1 and the inner cylinder 2 are bottomed A closed-end cylinder; the inner cylinder 2 is placed inside the outer cylinder 1, and the inner cylinder 2 is divided into two parts by the partition 3, the upper part is the cleaning chamber 7, and the lower part is the overflow chamber 8; the overflow pipe 4 is located in the cleaning chamber 7, the upper end of the overflow pipe 4 is open, and the lower end is connected with the overflow chamber 8; the breathing pipe 5 is located in the cleaning chamber 7, the upper end of the breathing pipe 5 is open, and the opening end is higher than the upper end of the overflow pipe 4 Opening, the lower end communicates with the overflow chamber 8; the hanging tube 6 is located in the upper...

Embodiment 2

[0026] The damaged fuel assembly of a certain sodium-cooled fast neutron reactor is cleaned by the cleaning device for the damaged fuel assembly of Example 1, and the basic process is as follows:

[0027] (1) Add an appropriate amount of metallic lead to the inner cylinder 2, and heat to melt the lead;

[0028] (2) Hang the damaged fuel assembly from the center of the hanging tube 6 into the cleaning chamber 7 of the inner cylinder 2, so that the damaged fuel assembly is immersed in the molten lead; the sodium adhering to the damaged fuel assembly reacts gradually with the lead in the cleaning chamber 7 to form an alloy , the molten surface material flows into the overflow chamber 8 from the overflow pipe 4;

[0029] (3) After the reaction is finished, the damaged fuel assembly is lifted from the inner cylinder 2, the heating is stopped, and the cleaning is completed.

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Abstract

The invention relates to a removal device of radioactive contamination, aims to solve the problem of removing sticky sodium in a damaged fuel assembly of a sodium-cooled fast neutron reactor in China and provides a cleaning device of the damaged fuel assembly. The cleaning device of the damaged fuel assembly comprises an outer cylinder, an inner cylinder, a partition plate, an overflowing pipe, a breathing pipe and a hanging cylinder; the inner cylinder is partitioned by the partition plate into two parts, the upper portion is a cleaning chamber, and the lower portion is an overflowing chamber; the hanging cylinder is located on the upper portion of the cleaning chamber and is in a funnel shape. The cleaning device of the damaged fuel assembly is reasonable in structure design and convenient and fast to operate, it is guaranteed that a cleaning agent and the sticky sodium react normally while efficient removal of a reaction product is achieved, and the utilization rate of the cleaning agent is greatly raised. By means of the cleaning device, the problem of removing sticky sodium in the damaged fuel assembly of the sodium-cooled fast neutron reactor in China is solved, sticky sodium cleaning efficiency is high, the removal effect is good, and the principle of minimization of radioactive waste is well satisfied.

Description

technical field [0001] The invention relates to a device for removing radioactive pollution, in particular to a device for cleaning damaged fuel assemblies. Background technique [0002] Sodium-cooled fast neutron reactor, as its name suggests, is a nuclear reactor that uses metallic sodium as a coolant. It has good development prospects due to its inherent excellent characteristics. In a sodium-cooled fast neutron reactor, some reactor components will be in contact with metallic sodium, such as fuel assemblies, sodium pipelines, etc. The safety of later transportation, handling and other processes. [0003] For general sodium-adhered parts with low radioactive levels, water cleaning can be considered to make the adhering sodium react with water, so as to achieve the purpose of removal. However, for a damaged fuel assembly, a certain amount of high-level radioactive substances will be released after it is damaged, so that it is subject to a high level of radioactive pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/30
CPCG21F9/30
Inventor 李凌霄俞晓琛李君瑜刘绩伟
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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