RGPu与WGPu驱动条件下钍基S&B型燃料组件特性分析  

Analysis of Thorium-Loaded S&B Fuel Blocks Using RGPu and WGPu as Driver Fuels

作　　者：王金成 黄杰 丁铭 Wang Jincheng;Huang Jie;Ding Ming(Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University,Harbin,150001,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen,Guangdong,518026,China)

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001 [2]中广核研究院有限公司,广东深圳518026

出　　处：《核动力工程》2020年第2期16-21,共6页Nuclear Power Engineering

基　　金：国家自然科学基金资助项目(11405036)。

摘　　要：武器级钚(WGPu)与反应堆级钚(RGPu)可以分别从废旧拆除的核武器中以及轻水堆乏燃料中获得,二者均可以作为钍基燃料的驱动燃料。为对上述2种驱动燃料特性进行研究,利用DRAGONV4程序以及JEFF3.11-295群截面库进行反应堆物理计算。采用修正4因子公式对WGPu与RGPu驱动条件下的S&B 6+3型组件初始无限增殖系数进行分析。同时,为确定WGPu与RGPu增殖性能最优的空间分离尺度和钍含量,进一步对比了不同空间分离尺度的S&B型组件和MOX组件寿期末的233U质量。结果表明,钍含量相同时,WGPu具有较高的热中子裂变系数,导致其初始无限增殖系数和燃耗深度均大于RGPu,并且不随钍含量的大小而改变。RGPu作为驱动燃料的S&B5+4-70%Th组件具有最优增殖性能。WGPu作为驱动燃料时,MOX型组件233U质量大于S&B型组件,并在70%钍含量时达到最大值。Weapon grade plutonium(WGPu)and reactor grade plutonium(RGPu)can be obtained from old dismantled nuclear weapons and spent fuel in LWRs,both of which can be used as driver fuels of thorium-loaded reactor.In order to analyze the two driver fuels,the DRAGON V4 and the JEFF 3.11-295 group cross section library were used for neutronic calculation.The modified four-factor formula was used to analyze the initial infinite multiplication factor of S&B 6+3 block under WGPu and RGPu driving conditions.At the same time,in order to determine the optimal spatial separation scale and thorium content of WGPu and RGPu proliferation performance,the 233 U mass of S&B type blocks in different spatial separation scales and MOX blocks at the end of life were further compared.The results show that with same content of thorium,WGPu has a higher thermal neutron fission coefficient,which leads to its initial infinite multiplication factor and discharge burnup greater than RGPu,and has nothing to do with the thorium content.RGPu,as a driving fuel S&B 5+4-70%Th,has the best proliferative properties.As for WGPu,the 233 U mass of the MOX type block is greater than that of the S&B type block and reaches a maximum at 70%thorium content.

关 键 词：武器级钚(WGPu) 反应堆级钚(RGPu) 钍基S&B型燃料组件 空间分离效应 

分 类 号：TL32[核科学技术—核技术及应用]