曾磊, 杨波, 刘义保, et al. MCNP Apply in Calculating the Changing of Reactor Critical Coefficient Keff under Different Temperature[J]. 2012, (1): 24-26+40.DOI:
MCNP在计算温度对反应堆临界系数Keff值影响中的应用
摘要
堆芯内温度变化时
中子能谱、微观截面等都将相应地发生变化。所以与反应性有关的许多参数
如热中子利用系数、逃脱共振俘获概率等都是温度的函数。因而
当反应堆中各种成分的温度变化时
将引起反应堆临界系数的变化。本文利用蒙特卡罗方法的MCNP程序
从压水堆的压力容器
燃料组件和控制棒驱动组件等元件出发建模
对温度改变之于反应堆剩余反应性影响做了相应研究。模拟结果表明:随着温度的升高
反应堆剩余反应性逐渐减。并且得到结果与实际值较符合。
Abstract
Reactor core temperature changing
the neutron spectrum
micro-cross-section will change accordingly. So many parameters of the reaction
such as the thermal neutron utilization factor
the probability of escaping resonance capture
are all a function of temperature. Thus
when the various components of the reactor temperature change
it will cause the reactor critical factor changing. In this paper
by using MCNP program
based on modeling on the PWR pressure container
fuel module and drive component elements
the corresponding research on the effects of reactor excess reactivity under different temperature were analyzed. The simulation results show that
with the increasing of temperature
reactor excess reactivity decrease gradually. And the results have a good fit with the practical values.