核燃料裂变产物对临界影响研究  

Study on Critical Effect of Nuclear Fuel Fission Product

作　　者：尹生贵 夏兆东[1] 梁淑红[1] 朱庆福[1] 曹健[2] YIN Shenggui;XIA Zhaodong;LLANO Shuhong;ZHU Qingfu;CAO Jian(China Institute of Atomic Energy,P.O.Box 275 45,Beijing 102413,China;Nuclear and Radiation Safety Center,Ministry of Environmental Protection,Beij ing 100082,China)

机构地区：[1]中国原子能科学研究院反应堆工程技术研究部,北京102413 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《原子能科学技术》2018年第7期1194-1199,共6页Atomic Energy Science and Technology

摘　　要：本文针对钐、钕、钆和银等4种裂变产物在中试厂核临界安全实验装置上开展了临界实验研究。堆芯的易裂变材料为固液两相存在,固体燃料为二氧化铀,液体燃料为硝酸铀酰。固体燃料棒采用六角形方式排布,浸泡在硝酸铀酰溶液中。将临界实验测量结果与蒙特卡罗程序MONK的理论计算结果进行比较。结果表明:理论计算结果与临界实验测量结果符合较好;裂变产物样品引入的负反应性价值非常可观,能谱变化显示裂变产物样品对中子的吸收在热能点以下能区起决定性作用。Critical experiments on the four fission products including Ag,Sm,Gd and Nd were conducted on uranyl nitrate solution experiment facility.The fissile material of the core was solid-liquid two-phase,solid fuel was uranium dioxide and liquid fuel was uranyl nitrate.The fuel rods were arranged in hexagonal lattice,and were soaked in uranyl nitrate solution.The results of the critical experiment were compared with those of the Monte Carlo code MONK.The theoretical calculation results are in good agreement with the critical experimental results.The negative reactivity worth introduced by the fission product sample is considerable and the spectrum change shows that the absorption of neutrons by the fission product sample plays a conclusive role in the energy region below the thermal energy point.

关 键 词：裂变产物 临界实验 MONK程序 

分 类 号：TL375[核科学技术—核技术及应用]