Application and quantitative verification of JMCT in engineering design of improved Chinese pressurized reactor CPR1000
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摘要: CPR1000系列反应堆是目前国内广泛应用的第二代压水堆型号之一，蒙特卡罗程序在CPR1000系列反应堆的验证与确认是该程序实现反应堆工程设计应用的关键环节。基于某CPR1000机组实际参数，使用由国内单位研发的蒙特卡罗程序JMCT在该机组开展了粒子输运建模计算，分别进行了临界计算和固定源计算，并进行了验证与确认。对于临界计算，采用JMCT建立了全堆芯pin-by-pin模型，计算了堆芯有效增殖因子和功率分布。对于固定源计算，建立适用于屏蔽分析的反应堆模型和辐照监督管精细结构模型，计算了两个核电机组多个循环的辐照监督管探测器位置累积快中子注量。通过将JMCT的计算结果与参考程序的计算结果、反应堆实际测量值进行了对比，验证了JMCT程序在CPR1000反应堆工程设计中的实际使用效果，证明了JMCT程序具备工程级的计算精度。Abstract: The improved Chinese pressurized reactor CPR1000 is one of the widely used second-generation pressurized water reactor in China. Quantitative verification of the Monte Carlo code in CPR1000 series reactors is a key step to demonstrate its ability in engineering design. Based on the actual parameters of a CPR1000 unit, the JMCT Monte Carlo code was used to perform particle transport modeling and calculations. Critical calculations and fixed-source calculations were performed, then the verification and validation were conducted. For critical calculations, a full core pin-by-pin model was established using JMCT to calculate the effective multiplication factor and power distribution of the core. For fixed source calculations, a reactor model for shielding analysis and a detailed structural model of irradiation surveillance capsules (ISC) were established. Based on the neutronic parameters of multiple refueling cycles, simulation was performed to calculate the cumulative fast neutron fluence for two ISC extracted from two nuclear power plants. By comparing the calculation of JMCT with the reference code and measurement, the simulation ability of JMCT code in CPR1000 reactor was demonstrated, and it was proven that the calculation accuracy of JMCT code is of engineering-level.
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图 3 反应堆固定源计算模型与辐照监督管探测器位置示意图
Figure 3. Fixed-source calculation model and the position of detectors of ISC
图 5 压力容器内表面周向中子注量
Figure 5. Peripheral neutron fluence distribution of RPV’s inner surface
图 6 压力容器1/4壁厚轴向中子注量
Figure 6. Axial neutron fluence distribution in the quarter thickness of RPV
表 1 有效增殖因子计算结果
Table 1. Calculation of effective multiplication factor
code keff statistic error/10−6 relative difference of
two codes/%relative difference of code
and measurement/%JMCT 1.001995 8.1 0.11 0.20 OpenMC 1.000900 7.5 0.09 
下载: 导出CSV
表 2 辐照监督管的快中子注量对比
Table 2. Comparison of fast neutron fluence in ISC
ISC detector E/MeV uncertainty of
measurement/%relative difference of calculation
and measurement/%1 H ＞ 1.0 2.9 6.4 ＞ 0.1 2.6 M ＞ 1.0 2.1 6.1 ＞ 0.1 3.3 L ＞ 1.0 2.9 7.8 ＞ 0.1 7.1 2 H ＞ 1.0 2.9 3.4 ＞ 0.1 8.9 M ＞ 1.0 2.3 5.8 ＞ 0.1 3.0 L ＞ 1.0 3.7 6.7 ＞ 0.1 9.7
下载: 导出CSV
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