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采用三维离散纵标-蒙特卡罗耦合方法(SN-MC耦合方法)对压水堆压力容器的快中子注量率进行计算分析,并与离散纵标方法(SN方法)、蒙特卡罗方法(MC方法)的计算结果以及测量值进行比较。结果表明,SN-MC耦合方法的计算结果和测量值相比偏差在20%以内,满足美国核管会(NRC)法规导则RG1.19对快中子注量率计算方法偏差的要求;当SN-MC耦合方法和MC方法达到相同计数误差水平时,其计算速度比MC方法快2~10倍。
The fast neutron fluence rate of pressurized water reactor pressure vessel was calculated and analyzed by using the three-dimensional discrete ordinate-Monte Carlo coupling method (SN-MC coupling method), and compared with the discrete ordinate method (SN method), Monte Carlo method (MC method) and the measured results are compared. The results show that the calculated results of the SN-MC coupling method are within 20% of the measured values and meet the requirements of the RG1.19 method for the deviation of the fast neutron fluence rate calculation method of the National Nuclear Council (NRC) When the SN-MC coupling method and the MC method reach the same counting error level, the calculation speed is 2 to 10 times faster than that of the MC method.