国和一号(CAP1400)首循环堆芯启动物理试验高保真模拟分析北大核心CSCD

为了避免启动物理试验参数预测值不准确,影响电厂调试启动,可利用数值反应堆对启动物理试验参数进行精准预测。使用CAP1400数值反应堆系统中的蒙特卡罗粒子输运程序JMCT、确定论高保真模拟程序NECP-X及先进中子学程序SCAP-N,对CAP1400反应堆首循环堆芯进行建模,开展启动物理试验高保真模拟。数值结果表明,以JMCT程序为参考,NECP-X程序与SCAP-N程序对于灰棒组价值的绝对计算偏差在±8×10^(?5)以内,对于黑棒组价值的相对计算偏差在±3%以内,对于黑棒总价值的相对计算偏差在±1%以内,对于组件相对功率分布的相对计算偏差在±2.5%以内,各程序计算结果符合得很好,可有效支撑反应堆的调试启动过程。

Zero power physics test high fidelity simulation for first core of Guo He One (CAP1400) reactor

To avoid inaccurate predicted values of zero power physics test (ZPPT) parameters, which will affect the commissioning and startup of the nuclear power plant, the numerical reactor can be used to accurately predict the ZPPT parameters. Based on the codes of the CAP1400 numerical reactor system, including the Monte Carlo code JMCT, the deterministic high-fidelity code NECP-X and advanced neutronics code SCAP-N, the CAP1400 first core was modeled to realize high-fidelity simulation of the ZPPT parameters. Numerical results show that the calculation results of the three high-fidelity simulation codes are in good agreement. Taking JMCT as a reference, the absolute deviations of NECP-X and SCAP-N for the gray control bank worth are within ±8×10?5, the relative deviations for the black control bank worth are within ±3%, the relative deviations for the total worth of all the black control banks are within ±1%, and the relative deviations for the assemble relative power are within ±2.5%. The ZPPT parameters of the CAP1400 first core are accurately predicted, which can effectively support the commissioning and startup of the CAP1400 reactor.