期刊论文

Xie, Jinsen

中文

原子能科学技术

1000-6931

2022

56

9

1906-1914

10.7538/yzk.2021.youxian.0667

本校为第一机构

瞬发中子基波衰减常数α可定量描述反应堆内中子随时间的变化,是计算绝对反应性所需的中子动力学参数之一,对次临界(特别是较深次临界)绝对反应性的精确测量具有重要意义。本文在开源程序OpenMC基础上,基于k-α迭代方法,以中子径迹长度上的平均时间吸收权重修正作为k-α迭代参数因子,在输运过程中对瞬发、缓发中子分别考虑,开发了具有瞬发α本征值问题计算功能的OpenMC-PA模块。以Godiva衍生基准题和MUSE-4次临界实验装置为计算对象,对程序计算瞬发α本征值问题能力进行验证。结果表明,该计算模块有优于MCNP4C的计算速度与计算范围,计算值与参考值的相对误差小于0.5%。OpenMC-PA能满足次临界系统...

Neutron kinetic parameters such as effective delayed neutron fraction j]e{{ and mean generation time of prompt neutron are the bridges that between reactivity (in unit of dollar) measured by experiment and reactivity by calculation. Accurate measurement and calculation of subcritical reactivity is an important problem in the development of accelerator driven subcritical reactor and control rod calibration in subcritical condition. To compare subcritical reactivities between experiment and calculation, experimental measurement methods that based...