铍光中子对研究堆瞬态特性影响研究  

The Influence of Beryllium Delayed Photo Neutron on Transient Performance of Research Reactor

作　　者：张丹 张航 张舒 邹志强 陆雅哲 

机构地区：[1]核反应堆系统设计技术重点实验室,成都610213

出　　处：《核安全》2016年第3期79-83,共5页Nuclear Safety

基　　金：核反应堆系统设计技术重点实验室资助项目;项目编号KLO14-410200-SQ02

摘　　要：在采用铍材作为慢化剂或反射层的热中子反应堆中,由于^(235)U裂变产物放出的高能γ光子会与~9Be发生(γ,n)反应,产生光激发缓发中子,即铍光中子,会对反应堆的动态特性产生影响。本文选取经典的铍光中子分组参数,采用系统程序relap5,研究了铍光中子对研究堆瞬态特性的影响。研究表明,铍光中子的存在导致反应堆剩余裂变功率增多和持续时间增加,从而提高了余热水平;铍光中子的存在使得瞬态中核功率变化滞后,对反应堆安全有一定的影响。In the thermal neutron reactors adopted beryllium material as moderator or reflector, the photo neutron would be emitted as （ γ , n） reaction caused by the high energyY emitted by fission products , the reactor kinetics performance will be influenced as the existence of photo neutron. The typical group constants for Be - photo neutrons were selected, and the influence of Be - photo neutrons on the transient performance of reasearch reactor was studied by relap5. The results shows that the amount of residual fission power will increase and the sustained time will aslo be extend ; the change of nuclear power of reactor will be delayed in the transient as the existence of photo neutron, therefore the safety of reactor will be affected.

关 键 词：研究堆 铍反射层 光中子 瞬态 

分 类 号：TL431[核科学技术—核技术及应用]