HFETR运行寿期和燃料元件装载量优化研究

文章建立了中子转换比与运行寿期之间关系的分析模型，设计出不同运行寿期的实际堆芯并进行计算，研究了⁶⁰Co产量和中子转换比随高通量工程试验堆（HFETR）运行寿期的变化规律。同时，通过对新燃料元件堆芯的研究找出燃料元件装载量对⁶⁰Co产量和中子转换比的影响，采用点堆模型分析平衡堆芯下HFETR的燃料元件装载量。该优化研究的目的在于为HFETR堆芯装载和运行方式优化提供参考以提高其运行的经济性。结果表明，HFETR运行寿期设计为25 d较佳，在此寿期下的平衡堆芯燃料元件理想装载量为70盒。

Optimization Study on Operation Life and Loading Number of Fuel Element in HFETR

Analysis model was established for the relationship between neutron conversion ratio and operation life. The law that yield of ⁶⁰Co and neutron conversion ratio changed with operation life of High Flux Engineering Test Reactor (HFETR) was studied by designing and calculating actual reactor cores with different operation lifes. At the same time, when reactor core loaded entirely with new fuel elements, the effect of its loading number on yield of ⁶⁰Co and neutron conversion ratio was found out. Accordingly, under the condition of balance cycle in HFETR core, loading number of fuel element was analyzed by using point reactor model. The optimization study was valuable as the reference for optimization on loading design and operation manner of HFETR in order to improve its operation economy. The results show that 25 days operation life for HFETR is preferable to any other and the ideal number of fuel element is 70 in balance cycle with the life.