摘要
空间核热推进(SNTP)粒子球床堆(PBR)呈现正的慢化剂温度效应,影响反应堆运行安全。基于PBR堆芯物理模型,采用蒙特卡洛中子-光子输运程序(MCNP)对PBR堆芯慢化剂温度系数进行计算。从中子平衡的角度分析慢化剂升温前后堆芯内中子能谱、中子产生率、中子吸收率和中子泄漏率的变化。结果表明:7Li H升温后,堆芯总的中子消失率(吸收率和泄漏率)的增量要比中子产生率的增量少得多,使得PBR堆芯表现出正的慢化剂温度效应,且低温时正温度系数值较大。
The moderator temperature effect is positive of the particle bed reactor （PBR） model of SNTP, which will have a bad influence on the core safety. The changes of neutron spectra of reactor core, neutron production rates, neutron absorption rates and leakage rates at different 7LiH moderator temperature were analyzed with the method of neutron balance by using MCNP code based on the PBR model. The results show that when 7LiH temperature rises, neutron losing rates, including neutron absorption rates and leakage rates, increases obvious larger than that for neutron production rates, which caused PBR core presents positive moderator temperature effect, especially when it at lower temperature.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2016年第1期4-7,共4页
Nuclear Power Engineering
基金
国家自然科学基金资助项目(11275152)
