CAJ | 학술논문

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。
본문채용중자수운정서MCNP ，기우ENDF/B-Ⅶ.1핵수거고，대궤충전형타성기질연료（IMF）적Doppler계수진행료계산，병통과이론분석급출료각핵소대Doppler계수공헌적표체식。결과표명：재상동타성기질조건하，무기급Pu연료적Doppler계수적절대치소우반응퇴급Pu연료적；재타성기질중첨가232 Th가사Doppler계수경부，차가사IMF획득여저농 UO2연료상근적Doppler계수；붕가연독물대Doppler계수적공헌위정효응，이이가연독물칙가진일보증강부Doppler계수，유리우반응퇴적고유안전성。
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 .