启动物理实验中PNS的堆外探测器响应和外推临界研究  

Study on Characteristics of Ex-core Detector Response on Primary Neutron Source and Criticality Extrapolation Method during Start-up Experiment

作　　者：韩嵩[1] 石秀安[1] 付学峰[1] 

机构地区：[1]中科华核电技术研究院有限公司,广东深圳518026

出　　处：《核动力工程》2014年第4期1-4,共4页Nuclear Power Engineering

摘　　要：使用MCNP5对启动物理实验中一次中子源(PNS)在堆外源量程探测器(SRD)响应进行模拟计算,分析堆芯有效倍增因子effk、带源有效倍增因子sk和探测器计数C之间的关系。通过对SRD响应系数a的预测,得到优于传统的1/C外推预测临界法的a'/C外推预测临界法,使硼稀释过程中的外推曲线线性度更好。计算结果表明,接近临界时a'/C值与eff1?k线更加吻合。MCNP5 was used to simulate the ex-core source range detector （SRD） response to the primary source （PNS） at the stage of reactor start-up experiment. The relationship among ken,, ks and the detector counts C has been analyzed. Through the prediction of SRD response factor a, traditional criticality extrapolation method 1/C is optimized by a＇/C in order to obtain a more linear extrapolated curve in the boron dilution process. The result shows that a＇/C gives a better match with 1-kefr as soon as the core aooroaches to critical.

关 键 词：MCNP5 PNS SRD 外推预测临界 

分 类 号：TL32[核科学技术—核技术及应用]