摘要
本文采用中子输运程序MCNP,基于ENDF/B-Ⅶ.1核数据库,对几种典型惰性基质燃料(IMF)的Doppler系数进行了计算,并通过理论分析给出了各核素对Doppler系数贡献的表达式。结果表明:在相同惰性基质条件下,武器级Pu燃料的Doppler系数的绝对值小于反应堆级Pu燃料的;在惰性基质中添加232 Th可使Doppler系数更负,且可使IMF获得与低浓UO2燃料相近的Doppler系数;硼可燃毒物对Doppler系数的贡献为正效应,而铒可燃毒物则可进一步增强负Doppler系数,有利于反应堆的固有安全性。
Based on neutron transport code MCNP and ENDF/B-Ⅶ.1 database ,Doppler coefficients of typical inert matrix fuel （IMF） were calculated and expressions of isotopic contributions to Doppler coefficient were given by theoretical analysis . The results indicate that absolute Doppler coefficient of weapon-grade plutonium IMF is smaller than that of reactor-grade plutonium fuel . The additive of 232 Th makes the Doppler coefficient more negative which is similar to UO2 in quantity .The contribution of boron burnable poison to Doppler coefficient is positive ,however ,erbium burnable poison can further enhance the negative Doppler coefficient ,w hich is conducive to reactor inherent safety .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第6期1067-1071,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(91126018)
湖南省教育厅科学研究项目资助(11A101)
