空间锂冷概念快堆堆芯中子学特性研究

本文研究了一种空间锂冷概念快堆的堆芯中子学特性。反应堆燃料采用氮化铀，冷却剂采用⁷Li液态金属，主要结构材料采用W-25%Re。反应堆的控制靠反射层内的控制鼓来实现。建立了程序的计算模型，通过计算和分析，给出了堆芯的主要尺寸和物理参数，计算了堆芯的控制鼓价值、燃耗和功率分布。分析了堆芯中Re的谱移吸收特性和满功率运行7 a不需换料的性能，谱移吸收特性能确保反应堆在发射失败浸在水或湿沙中时处于次临界状态。

Neutronics Characteristic of Conceptual Space Lithium Cooled Fast Neutron Reactor

The conceptual design of a space lithium cooled fast neutron reactor was analyzed with MCNP. The nuclear reactor used uranium mono-nitride as the fuel, lithium as the coolant, and tungsten-25% rhenium as main structural materials. The reactor was controlled by drums in the side reflector. The core calculation models based on MCNP were made. By calculations and analyses, the main dimensions and physics parameters of the core were given. The reactivity worth of the control drums, core burnup and power distributions were calculated. The Re’s spectral shift absorb (SSA) character that ensures reactor’s subcriticality when fully submerged in wet sand or water, following a launch abort accident and the 7 a full power running no need refueling were validated.