基于频域分析方法模拟测量瞬发中子衰减常数  

A Simulation Method Based on Frequency Spectrum Analysis for Measurement the Prompt Neutron Decay Constant

作　　者：王冬 向嫄 肖刚[2] 景阳 佘若谷[2] 

机构地区：[1]中核控制系统工程有限公司,北京100176 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《核电子学与探测技术》2017年第1期104-107,共4页Nuclear Electronics & Detection Technology

基　　金：中国工程物理研究院基金重点项目;2011A0103009

摘　　要：采用基于广义半马尔科夫过程(GSMP)建模的仿真方法模拟随机中子场的瞬态演化,利用相应程序MES模拟了252Cf源驱动噪声测量,通过对泄露中子时间谱的频谱分析给出了系统的瞬发中子衰减常数。模拟结果与实测结果比较表明:次缓发10分时,其误差为7%;次缓发100分时,其误差为3%;可为理论分析核装置安全性提供一种新的技术手段。This paper presents a method to simulate the transient evolution of random neutron field which based on Generalized semi - Markov Process（ GSMP）, and simulates the process of the noise measurement driven by 252Cf source be simulated though the program MES based on GSMP. The simulation calculates the decay con- stant a through the frequency spectrum analysis. The difference between theoretical and experiment result is compared, the max relative error is about 7% when the system reactivity at sub critical 10 percents, and the max relative error is about 3% when the system reactivity at sub critical 100 percents. This theory and simula- tion method can be used in nuclear safety analysis as a new technique.

关 键 词：随机中子场 瞬发衰减常数 噪声测量 GSMP方法 

分 类 号：TL81[核科学技术—核技术及应用]