轻水堆燃料组件计算程序包TPFAP

TPFAP——a Code Package for LWR Fuel Assembly Calculation

TPFAP是一个同时适用于PWR和BWR的穿透几率法燃料组件燃耗计算程序包。它首先利用碰撞几率方法在库能群结构下完成三区或四区圆环几何的栅元输运计算。载钆燃料棒或硼棒可燃毒物栅元的有效吸收截面由微燃耗程序CMB产生,两维穿透几率法组件计算是在(x,y)几何下进行。基模计算用来考虑中子泄漏修正。根据反应率等效,计算组件等效扩散参数。在每一燃料棒和可燃毒物棒进行燃耗计算,TPFAP给出每一燃耗步的组件和栅元少群截面、功率分布,提供核设计和安全分析所需参数。

TPFAP is a transmisssion probabilily fuel assembly code package for burnup calculations on BWR and PWR. The transport calculation is started with a number of micro-group calcula tions in the library structure by using of collision probability method in three or four annular regions. Effective absorption cross section generated by the CMB are used for Gd loaded fuel or boron pin cell. The 2D multi-group integral transport routine based on the transmission probability method is in (x, y) geometry. A fundamental mode calculation is performed to accouunt for leakage effect. The effective diffusion theory cross section are calculated using the reaction rate equivalence theorem. The depletion is calculated in each fuel and burnable absorbor pin. Then TPFAP output few group macro and micro cross section and power distribution at each burnup step for pin cell and assembly, being used in the nuclear design, fuel management and safely analysis.