Study on Micro Reactor Physics for Improvement of Neutronics Calculation

改进中子学计算的微反应堆物理研究

基本信息

批准号：
13480148
负责人：
TAKEDA Toshikazu
金额：
$ 6.34万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

1)We have developed the theory for transient analysis with the consideration of Micro-reactor physics effect, and have developed the calculation code based on the developed theory. The current Coupling Collision probability method (CCCP method) is adopted in the developed theory because the CCCP method can strictly model the heterogeneity such as a pin cell structure in a fuel assembly and can treat the heterogeneity in calculating the effective cross sections: New CCCP method, which can treat the transient in time has been developed, because the conventional CCCP method does not consider the transient2)The analysis based on Micro-reactor physics shows that the angular distribution of neutron flux is greatly affected by the surrounding geometry and composition. Therefore, we considered the technique to measure the angular distribution of neutron flux in the core. The designed technique uses the optical fiber detector and Cd tube. The technique was applied to the measurement of the angular distribution in the core assembled in C-core tank at KUCA, and the technique was found to be effective to measure the angular distribution of neutron flux.3)The neutronics-thermodynamics coupling code has been developed to evaluate the effect of temperature distribution in fuel rods during the transient phenomena. The developed code was used to analyze the control rod drop accidents at the cold and hot stand-by states with the direct modeling of the heterogeneity of temperature distribution etc. in fuel rods. As the results, it is found that the analysis based on Micro-reactor physics is necessary and useful to consider the complex temperature distribution in fuel rods at a transient, and also the effective temperature model, which has a flat temperature distribution in fuel rods, bring the miscellaneous results because of the complex temperature, distribution.

1）我们已经在考虑微反应物物理效应的情况下开发了瞬时分析的理论，并根据开发的理论制定了计算代码。 The current Coupling Collision probability method (CCCP method) is adopted in the developed theory because the CCCP method can strictly model the heterogeneity such as a pin cell structure in a fuel assembly and can treat the heterogeneity in calculating the effective cross sections: New CCCP method, which can treat the transient in time has been developed, because the conventional CCCP method does not consider the transient2)The analysis based on Micro-reactor physics shows中子通量的角度分布受到周围几何和组成的极大影响。因此，我们考虑了测量核心中子通量的角度分布的技术。该设计的技术使用光纤检测器和CD管。该技术应用于库卡（Kuca）C核储罐中组装的核心分布的测量，发现该技术有效地测量了中子通量的角度分布。3）已开发了中性胞源 - 热力学偶联代码，以评估短暂势能过程中燃料棒中温度棒的效果。开发的代码用于分析燃油棒中温度分布等异质性的直接建模，在冷和热的状态下分析控制杆滴事故。作为结果，发现基于微反应物物理学的分析对于考虑瞬态燃油杆的复杂温度分布以及在燃料棒中具有固定温度分布的有效温度模型是必要且有用的，因此由于温度复杂而带来了杂项结果。