摘要
空间堆作为一种可以改写航天器用途的关键电源技术备受航天大国关注。阐述一种热电一体化空间堆构想,通过合并堆芯系统和热电转化系统,提高系统的比功率,实现非重力自动循环能力。提出斯特林热电一体化空间堆,并对其在掉落事故时的安全特性进行研究,分析堆芯高径比、谱移材料添加方式、反射层、掉落环境和燃料密实效应对中子有效增殖因子的影响,提出在UN燃料元件中增加3.8 at%的谱移材料^(151)Eu_(2)O_(3)的保证措施。研究结果表明,该方案符合在12种事故工况及密实效应发生时有效增殖因子均小于0.98的掉落安全准则。
Space reactor,as a key power supply technology that can be used to rewrite the applications of spacecraft,has attracted the attention of aerospace powers.This paper describes the idea of a series of core-thermoelectric integrated space reactors.By combining the reactor core and thermoelectric conversion system,the specific power of the system can be improved and the ability of autonomous circulation independent on gravity can be achieved.Within these reactors,the Stirling thermoelectric integrated space reactor is emphatically proposed.In this paper,the safety characteristics of Stirling thermoelectric integrated space reactor in the event of drop accident were studied.The influence of core height diameter ratio,adding method of spectral shift material,reflector,drop environment and fuel compaction effect on neutron effective multiplication factor were analyzed.The assurance measures of adding 3.8 at%spectral shift material ^(151)Eu_(2)O_(3) in UN fuel element were proposed.The results show that this scheme meets the safety criterion that the effective multiplication factor is less than 0.98 under 12 accident conditions.
作者
夏彦
李健
周钦
欧学东
赵春晴
孙韶蕾
黄首清
XIA Yan;LI Jian;ZHOU Qin;OU Xuedong;ZHAO Chunqing;SUN Shaolei;HUANG Shouqing(Institute of Spacecraft System Engineering,Beijing 100096;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100086;Beijing Institute of Spacecraft Environment Engineering,Beijing 100094)
出处
《中国基础科学》
2023年第1期46-54,59,共10页
China Basic Science
基金
国家重点研发计划项目(2020YFB1901800)
关键词
空间堆
热电一体化
掉落事故
谱移吸收材料
space reactor
thermal-electric integration
drop accident
spectral shift absorbers
