基于cosRMC的新一代PWR栅元和组件燃耗计算

新一代压水堆与现有压水堆的重要区别之一是燃料富集度不同，考虑到燃料制造、燃料燃耗等问题，目前压水堆的UO₂燃料富集度通常小于5%，MOX燃料中易裂变Pu含量通常小于6%。新一代压水堆的燃料富集度有可能超过现有标准，平均燃耗有望达到70 GW?d/tU，这对反应堆计算软件提出了新的要求。本文基于反应堆蒙特卡罗程序cosRMC对新一代压水堆栅元和组件基准进行了中子学分析，包括裂变反应率分布、中子通量密度分布及核子密度随燃耗的变化等，并对含Gd棒的组件燃耗计算进行了细致分析。计算结果表明，cosRMC的计算结果与国际上其他程序的计算结果符合较好。通过程序之间结果对比发现，随着燃耗的增加，不同程序计算的Pu含量差别变大。

Burnup Calculation of Next Generation PWR Cell and Assembly Based on cosRMC

One important character of next generation PWR is fuel enrichment .Taking into account of fuel fabrication and burnup ,the 235 U enrichment in UO2 fuel is less than 5% ,and the content of fissile Pu in M OX fuel is also less than 6% in general in PWR . The enrichment in the next generation fuel is likely to exceed the existing standard and the average burnup is expected to reach 70 GW · d/tU ,w hich proposed new require‐ments for reactor calculation software .The fission reaction rate distribution ,neutron flux density distribution and nuclear number density with the burnup for the next gener‐ation PWR fuel pin cell and fuel assembly were analyzed using cosRMC .In addition ,the burnup of Gd rod was also analyzed in detail .The results show that the result using cosRMC agrees with that calculated by other well‐known codes .It is also shown that the difference of Pu content in fuel calculated by different codes increases with burnup .