启动物理实验中PNS的堆外探测器响应和外推临界研究

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

China Nuclear Power Technology Research Institute, Shenzhen, Guangdong, 518026, China

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k_eff、带源有效倍增因子k_s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1-k_eff线更加吻合。
- MCNP5 /
- PNS /
- SRD /
- 外推预测临界
Abstract: 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 k_eff, k_s 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-k_eff as soon as the core approaches to critical.
- MCNP5 /
- PNS /
- SRD /
- Criticality extrapolation