Advanced Nodal Methods of the Few-Group BWR Core Simulator NEREUS

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概要

• 論文の詳細を見る

• A few-group nodal BWR core simulator NEREUS, which is based on the analytic polynomial nodal method, has been developed. The analytic polynomial nodal method is applicable to multigroups and has good accuracy for analysis of cores having large spectral mismatch between fuel assemblies, since the intranodal thermal flux can be correctly represented. In NEREUS, the following advanced methods are adopted to overcome the shortcomings of the conventional analytic polynomial nodal method. The flux solution iteration matrix is cast into the form of finite difference, by using the flux discontinuity factors which correct the finite difference error as well as the homogenization error. The intranodal burnup and spectral history distributions are considered in the method, and source moments are obtained by orthogonal expansions. Burnup calculations are made by looking-up exposure dependent tables for macroscopic cross sections, which are prepared by single assembly spectrum and depletion calculations. A unified model accounting for effects of spectral histories, caused by the spectral interaction between fuel assemblies and the control blade insertion, was incorporated. The NEREUS code was verified against benchmark problems and core tracking calculations.

• 一般社団法人 日本原子力学会の論文
• 1999-11-25

著者

• Iwamoto T

  Toshiba Corp.

• Iwamoto Tatsuya

  Isogo Nuclear Engineering Center Toshiba Corporation

• Yamamoto Munenari

  Isogo Nuclear Engineering Center Toshiba Corporation

関連論文

• Fission Product Model for BWR Analysis with Improved Accuracy in High Burnup
• Advanced Nodal Methods of the Few-Group BWR Core Simulator NEREUS
• Pin Power Reconstruction Methods of the Few-Group BWR Core Simulator NEREUS
• An Improved One-and-a-Half Group BWR Core Simulator for a New-Generation Core Management System

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