材料在辐照过程中所受的中子注量是辐照性能研究中的一个重要参数.上联箱铝材作为300#研究堆关键结构材料,经历了从反应堆首次临界到退役的全过程,极具材料辐照效应研究价值.为获取整个反应堆运行寿期内的上联箱中子注量水平,须克服堆芯装载变化频繁与堆芯不断扩大装载两大关键难点,故提出了堆芯归并等效计算方法.通过该方法的成功应用,得到了300#研究堆寿期内上联箱铝材的中子注量,并进行了误差分析.

Researching the material performance under neutron irradiation requires accumulative neutron fluence rate which is an important parameter.Al alloy on the upper link chest as a key structural material of Swimming Pool Research Reactor-300(SPRR-300),goes through the whole life of reactor under high neutron irradiation.Hence,the alloy is full of research value.To get the accumulative fluence rate of reactor upper link chest during the whole life span of reactor operation,this paper proposes a solution,namely core merging equivalent calculation method,aiming to deal with the frequent core configuration changing and expanding rationally.Applying this method,we have acquired the accumulative neutron fluence rate and conducted the pertinent error analysis.