现代应用物理2017，Vol.8Issue(1)：8-13,6.DOI:10.12061/j.issn.2095-6223.2017.010202
氢化锂慢化剂正温度效应分析
Study on Positive Temperature Effect of the Lithium Hydride Moderator
摘要
Abstract
To study the reason of the positive temperature effect of lithium hydride moderator,based on the particle bed reactor (PBR) physical model of the space nuclear thermal propulsion (SNTP), it was analyzed by three aspects of the neutron thermal Kernel effect, lithium hydride thermal expansion effect and the limit lithium hydride thermal dissociation effect by using MCNP code.The results show that the thermal motion of the target nucleus, and the interference effect of the chemical bonds and neutron wave cannot be ignored in the low energy region.When the temperature rises, the excited target nucleus is more easily excited, and the inelastic scattering is more susceptible to takeplace, the neutron energy spectrum becomes hardening when getting more energy.The neutron thermal kernel effect is dominant, which causes about 2 000 pcm reactivity to the PBR core, and the thermal expansion effect and the thermal dissociation effect of lithium hydride material are less affected than the former, which causes about-130 pcm and 200 pcm reactivity to the PBR core,respectively.The results provide a basilica reference for the future physical analysis of the PBR core safety.关键词
空间核热推进/粒子球床堆/热化效应/热膨胀效应/热离解效应Key words
space nuclear thermal propulsion/particle bed reactor/thermal kernel effect/thermal expansion effect/thermal dissociation effect分类
能源科技引用本文复制引用
姜夺玉,江新标,王立鹏,郭和伟,朱养妮,张信一..氢化锂慢化剂正温度效应分析[J].现代应用物理,2017,8(1):8-13,6.基金项目
国家自然科学基金资助项目(11275152) （11275152）
