西安脉冲堆反应性测量空间效应修正方法研究  

Research on Spatial Effect Correction Method of Xi’an Pulsed Reactor Reactivity Measurement

作　　者：赵巍 张良[1] 王宝生 袁建新[1] 张强[1] 朱广宁[1] Zhao Wei;Zhang Liang;Wang Baosheng;Yuan Jianxin;Zhang Qiang;Zhu Guangning(State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi'an,710024,China)

机构地区：[1]西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室,西安710024

出　　处：《核动力工程》2020年第4期148-152,共5页Nuclear Power Engineering

摘　　要：反应性是反应堆重要的物理参数,在西安脉冲堆上增加反应性实时监测功能,能够为操纵员提供反应性实时大小和变化趋势,有利于其安全运行。逆动态方法以其实时性好、能测量任意反应性引入而被广泛应用于反应性测量,但由于控制棒的移动会导致中子注量率空间分布前后不一致,而出现偏差。本文对逆动态方法和静态空间效应因子进行了理论分析,给出了相应的计算方法;以西安脉冲堆为研究对象,使用蒙特卡罗(MCNP)程序计算了探测器三维空间的响应函数,同时计算了归一化节块功率密度,由此得到静态空间效应因子;最后在脉冲堆上进行了不同棒速下插控制棒实验,处理实验数据得到控制棒积分价值曲线。结果表明,进行空间效应修正是必要的,经修正后计算得到的控制棒价值曲线更稳定,计算结果与真实值误差更小。Reactivity is an important physical parameter of the reactor. Adding the reactivity real-time monitoring function in Xi’an Pulsed Reactor can provide operators with the real-time responsiveness and trends, which is conducive to its safe operation. The inverse dynamic method is widely used in the reactivity measurement because of its good real-time performance, which is capable to measure any reactivity introduction. However, due to the movement of the control rod, the spatial distribution of the neutron injection rate is inconsistent, and the deviation occurs. In this paper, the inverse dynamic method and the static spatial effect factor are analyzed theoretically, and the corresponding calculation method is given. Taking Xi’an Pulsed Reactor as the research object, the three-dimensional response function of the detector is calculated by using Monte Carlo(MCNP) program, and the normalized nodal power density is calculated, thus the static spatial effect factor is obtained. Finally, the experiment of interpolating the control rod at different rod speeds is carried out on the pulsed reactor and the integral value curve of the control rod is obtained by processing the experimental data. The results show that it is necessary to correct the spatial effect. The value curve of the control rod is more stable and the error between the calculation result and the real value is smaller.

关 键 词：西安脉冲堆 反应性测量 空间效应 蒙特卡罗(MCNP) 

分 类 号：TL323[核科学技术—核技术及应用]