乏燃料中Pu同位素含量数值模拟  

Simulating plutonium isotopic composition in spent fuel

作　　者：徐雪峰[1,2] 田东风[3] 朱剑钰[1] 伍钧[1] 师学明[4] Xu Xuefeng Tian Dongfeng Zhu Jianyu Wu Jun Shi Xueming(Center for Strategic Studies of China Academy of Engineering Physics, Beijing 100088, China China Academy of Engineering Physics, Mianyang 621900, China Graduate School of China Academy of Engineering Physics, Beijing 100088, China Institute of Applied Physics and Computational Mathematics, Beijing 100094, China)

机构地区：[1]中国工程物理研究院战略研究中心,北京100088 [2]中国工程物理研究院研究生院,北京100088 [3]中国工程物理研究院,四川绵阳621900 [4]北京应用物理与计算数学研究所,北京100094

出　　处：《强激光与粒子束》2017年第3期60-64,共5页High Power Laser and Particle Beams

基　　金：能源局06专项(2015ZX06002008);国防科工局国防基础科研计划资助项目(C1520110002);国家磁约束核聚变能源研究专项资助项目(2015GB108002)

摘　　要：利用燃耗计算程序MCORGS模拟反应堆燃耗与乏燃料中Pu同位素含量之间的关系,通过对轴向上分为20段的重复栅元模型和组件模型进行的燃耗计算,得到压水堆中乏燃料中轴向不同位置燃耗的分布和Pu-239同位素含量的变化,模拟发现Pu-239同位素含量随着燃料棒在堆芯中的位置不同变化很大。同时,对VVER1000组件和压水堆17×17组件也进行了燃耗计算,计算发现组件径向不同位置的燃耗有一定差别。轴向上和径向上不同位置的燃耗差别会导致同一批卸载的乏燃料中含有很多低燃耗的燃料区间,这种乏燃料给国际核不扩散带来了巨大的风险,应该加强监管。In the field of nuclear arms control, non-proliferation is an significant area, particularly the proliferation of weap- on usable nuclear materials, which is concerned by many countries. We used burnup calculating code MCORGS to simulate the re- lation between the burnup of spent fuel in PWR and Pu isotopic composition. We built the model of pin-cell with 20 average axial zones, calculated its axial burnup distribution, and got the axial burnup and Pu-239 isotopic mass concentration distribution in dif- ferent axial positions in PWR. Based on hurnup calculation we found that Pu-239 isotopic concentrations in different axial position varied greatly. Further more, we simulated VVER1000 and PWR＇s 17×17 assembly. The simulation shows that the radial burn- ups in an assembly were also different. There are much different burnups in different positions of nuclear reactor, which result in many low burnup zones in spent fuel. This kind of spent fuel of LWR might brings serious nuclear proliferation to international community, and should be supervised more strictly.

关 键 词：钚同位素 燃耗 乏燃料 轻水堆 

分 类 号：O571.33[理学—粒子物理与原子核物理]