Loading method for MOX fuel assemblies axially arranged in multiple zones

A fuel assembly and multi-partition technology, applied in the direction of reactor fuel elements, nuclear reaction control, nuclear power generation, etc., can solve the problem of core axial power offset downwards, achieve the effect of improving performance and axial power distribution
CN106297906AInactive Publication Date: 2017-01-04CHINA NUCLEAR POWER ENG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHINA NUCLEAR POWER ENG CO LTD
Publication Date
2017-01-04
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a loading method for MOX fuel assemblies axially arranged in multiple zones. The MOX fuel assemblies are arranged in multiple zones in the axial direction, the Pu content in each zone is subjected to loading design, the Pu content of fuel pellets in the upper zones of the assemblies is increased, and the Pu content of fuel pellets in the lower zones of the assemblies is decreased, so that it is guaranteed that the average Pu content of the assemblies meets design requirements, and meanwhile it is avoided that positive axial power offset at the beginning of the fuel cycle life is caused when the average Pu content does not meet design requirements. On the basis that the axial power offset is relieved, the fewest types of Pu content fuel pellets are adopted to achieve axial loading design of the MOX fuel assemblies.
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Description

technical field

[0001] The invention belongs to the MOX fuel loading technology of the pressurized water reactor core, and in particular relates to a loading method of the MOX fuel assembly arranged in multiple sections in the axial direction. Background technique

[0002] Compared to UO 2 The PWR core composed of fuel assemblies, in the PWR core loaded with MOX fuel, due to the axial change of moderator density and the larger absorption cross section of MOX fuel, the axial energy spectrum of the core difference compared to UO 2 The core composed of fuel is large, which leads to a large axial power shift of the core, which is not conducive to flattening the core power peak factor, is not conducive to core control, and is not conducive to the safe operation of the core. Therefore, it is necessary to The MOX fuel assembly has a new design to improve the axial power offset of the core and ensure the safe operation of the core. Contents of the invention

[0003] The object ...

Claims

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