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Restarting method and system for making few-group cross section used in reactor nuclear design

A reactor and restart technology, applied in thermal reactors, nuclear reactors, non-uniform reactors, etc., can solve problems such as differences in restart functions, and achieve the effect of convenient use

Active Publication Date: 2016-07-27
STATE POWER INVESTMENT CORP RES INST
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Problems solved by technology

However, due to the different considerations of the few-group cross-section library in different nuclear design systems, there are certain differences in the restart function in the component program

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  • Restarting method and system for making few-group cross section used in reactor nuclear design
  • Restarting method and system for making few-group cross section used in reactor nuclear design

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Embodiment Construction

[0040] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present disclosure will be omitted during the description to avoid confusing the understanding of the present disclosure.

[0041] An overview of reactor core design will first be presented. The goal of core design is primarily the accurate prediction of core neutron behavior during reactor operation. Usually neutron calculations are performed based on nuclear data in which detailed information on the reaction probabilities (ie, cross-sections) of neutrons and target nuclei is stored for each nuclide. The cross-sections in the raw nuclear data have a very fine energy resolution sufficient to reproduce very complex neutron behavior. For heavy nuclides used in fission reactors, the number of energy grid points used to accurately reproduce the original cross section can sometimes be in the hundreds of ...

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Abstract

The invention discloses a restarting method and system for making a few-group cross section used in a reactor nuclear design. The method comprises the following steps: (a) acquiring the burn-up depth of a fuel assembly; (b) acquiring changes of one or more parameters of the fuel assembly under the condition of the burn-up depth; (c) executing parameter preprocessing directed at the changes of the one or more parameters; and (d) executing neutron transport calculation based on results of the parameter preprocessing so as to obtain few-group cross sections. The system comprises a burn-up depth acquisition unit which is used for acquiring the burn-up depth of the fuel assembly, a fuel parameter acquisition unit which is used for acquiring the changes of the one or more parameters of the fuel assembly under the condition of the burn-up depth, a parameter preprocessing unit which is used for executing parameter preprocessing directed at the changes of the one or more parameters, and a few-group cross section acquisition unit which is used for executing neutron transport calculation based on the results of the parameter preprocessing so as to obtain the few-group cross sections.

Description

technical field [0001] The present disclosure relates to the field of reactor nuclear design, and more particularly to a restart method and system for making a library of small group cross-sections for reactor nuclear design. Background technique [0002] During the use of the nuclear reactor, when the burn-up depth of the fuel assembly reaches a certain level, it needs to be replaced. However, since there are a large number (for example, 157) of fuel assemblies in the reactor, and due to differences in burnup depths, these fuel assemblies cannot all be replaced at the same time. Therefore, when replacing a fuel assembly, it is inevitable to use a new fuel assembly together with a fuel assembly that has reached a different depth of burnup. At this time, the layout of the fuel assemblies needs to be designed according to the relevant parameters of each fuel assembly (eg, burnup depth, average enrichment degree, burnable poison rod parameters, etc.). In addition, in order to...

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Application Information

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IPC IPC(8): G21C1/08
CPCY02E30/30
Inventor 孙业帅闫宇航刘志彦李硕余慧王幸陈义学
Owner STATE POWER INVESTMENT CORP RES INST
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