【作者】 熊厚华； 彭旦； 蔡德富； 李义国；

【Author】 XIONG Hou-hua,PENG Dan,CAI De-fu,LI Yi-guo(China Institute of Atomic Energy,P.O.Box 275-75,Beijing 102413,China)

【机构】 中国原子能科学研究院反应堆工程研究设计所；

【摘要】 应用蒙特卡罗计算程序,模拟计算山东微堆的堆芯参数,包括keff、eβff、控制棒价值、上铍效率、内辐照中子通量以及停堆深度,计算结果与实验结果基本一致。保持微堆堆芯尺寸不变,采用低富集度UO2芯体燃料棒替换原来的高浓铀燃料棒,计算不同235U富集度下微堆的有效倍增系数keff,据此确定满足要求的UO2富集度为12.5%。在此基础上计算了富集度为12.5%的低浓堆芯参数,并与高浓堆芯参数进行了比较。结果表明,微堆燃料低浓化是可行的。更多还原

【Abstract】 The reactor core parameters of miniature neutron source reactor(MNSR) with high enrichment uranium(HEU),such as keff,βeff,reactivity worth of the center control rod,reactivity worth of the top beryllium,inner irradiation site neutron flux density and shut down margin,were calculated by Monte-Carlo code.Comparison between the calculated and the experimented results was performed,and they were in agreement with each other very well.Without changing the core dimensions of the MNSR,but substituting the HEU fuel with low enrichment uranium(LEU) fuel and Al cladding with zircaloy cladding,the keff was calculated at the 235U enrichment from 12.0% to 12.5%,and the fitting enrichment of 12.5% was chosen.The reactor core parameters of MNSR with LEU of 12.5% were calculated.From the above calculated results,it is concluded that the conversion of MNSR with LEU of 12.5% is feasible.更多还原