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A Neutron Poison Sandwich Structure with Open Pores in a Continuous Dissolver

A sandwich structure and dissolver technology, which is applied in the field of critical safety control, can solve problems such as complex structures, and achieve the effects of improving processing capacity, increasing neutron absorption effects, and reducing reactivity

Active Publication Date: 2017-02-01
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the continuous dissolver is more complex than that of the batch dissolver, which puts forward higher requirements for equipment design and safety analysis

Method used

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  • A Neutron Poison Sandwich Structure with Open Pores in a Continuous Dissolver
  • A Neutron Poison Sandwich Structure with Open Pores in a Continuous Dissolver
  • A Neutron Poison Sandwich Structure with Open Pores in a Continuous Dissolver

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] The structure of the container part in the continuous dissolver that directly contacts the pellets is as follows: figure 1 As shown, the structure of the dissolving container (hereinafter referred to as the bucket) is similar to a fan-shaped body with a certain thickness, which is used to load the spent fuel pellets to be dissolved, and is placed in another flat tank container for dissolving spent fuel craft. figure 1 The bottom wall 1 and the side wall 2 of the bucket are marked in the figure, and the top wall of the container is not shown. In order to ensure the exchange of the solution in the bucket and the solution outside the bucket when dissolving, there are openings 4 on the top and bottom container walls 3,1 of the container, such as figure 2 shown.

[0016] In the entire dissolving device, the bucket has a small thickness and is a ...

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Abstract

The invention relates to a criticality safety control technology used by spent fuel dissolution equipment of a reprocessing plant, and in particular relates to a neutron poison sandwich structure with openings in a continuous dissolver. The neutron poison sandwich structure comprises a container for containing a spent fuel pellet to be dissolved; a plurality of openings for exchanging solutions are formed in the top wall and the bottom wall of the container; the top wall and the bottom wall of the container respectively have a sandwich structure and respectively comprise a stainless steel inner wall and a stainless steel outer wall; neutron poison is arranged between each stainless steel inner wall and the corresponding stainless steel outer wall. With the neutron poison sandwich structure, the distance between the neutron poison and a criticality safety control object, namely, a fissile material, is short, so that the neutron absorption effect of the neutron poison is improved, the reactivity in the dissolver is weakened, and the processing capacity of the dissolver is improved.

Description

technical field [0001] The invention relates to a critical safety control technology in spent fuel dissolving equipment of a reprocessing plant, in particular to a neutron poison interlayer structure with openings in a continuous dissolver. Background technique [0002] my country's nuclear fuel cycle policy adopts a closed nuclear fuel cycle method. The spent fuel discharged from the reactor is sent to a reprocessing plant to separate uranium and plutonium from the spent fuel for reuse. The reprocessing of spent fuel is an important stage of the closed nuclear fuel cycle. The reprocessing process mainly includes head-end treatment, chemical separation, and uranium and plutonium tail-end treatment. There are many links in the process flow of the reprocessing plant that require criticality safety control design and analysis, among which the head-end treatment is mainly to cut, dissolve, filter, season the spent fuel components, prepare for chemical separation, and the fissile...

Claims

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Application Information

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IPC IPC(8): G21C19/46G21F9/20
CPCY02E30/30Y02W30/50
Inventor 易璇霍小东杨海峰邵增
Owner CHINA NUCLEAR POWER ENG CO LTD
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