HTR－10控制棒及第二停堆系统反应性当量计算

Reactivity worth calculation for the control rods and secondary shutdown system of HTR-10

介绍了ＨＴＲ－１０高温气冷实验堆位于反射层中的控制棒和作为第二停堆系统的硼球孔道的反应性当量计算方法。用ＷＩＭＳ（积分输运碰撞几率法）程序、ＧＡＭ、ＴＨＥＲＭＯＳ程序方法产生控制棒区的截面。用一维离散坐标法程序ＯＮＥＳＮ１产生泄漏谱，在控制棒区的Ｂ４Ｃ从１０群截面归并为４群截面；用二维离散坐标法程序ＳＮ２ＤＢ，在控制棒区（包括Ｂ４Ｃ、空隙和部分石墨反射层）考虑空间效应做均匀化４群截面。有控制棒和无控制棒情况下的Ｋｅｆｆ本征值，是由三维扩散有限差分程序ＣＩＴＡＴＩＯＮ在（θ，ｒ，ｚ）坐标系条件下做出的，并给出控制棒的反应性当量。

This paper describes the method used in the reactivity worth calculation forthe control rod and secondary shutdown system in high temperature gas-cooled reactorHTR-10, in which the control rods and the secondary shutdown system are located at thereflector and directly near the core. WIMS, GAM and THERMOS codes are used in theusual way to produce reflector and control rod region cross sections. The one-dimensionaldiscrete-ordinate's theory code ONESN1 is used for calculating the leakage spectrum intoeach control rod zone, in order to collapse the 10 group cross sections into 4 groups, andthe two-dimensional discrete-ordinates transport theory code SN2DB is used forhomogenizing the cross sections in the region that includes control rod zone and part reflector zone. The eigenvalues K.ff for the situations with and without insertion of the controlrod are calculated using the three-dimensional diffusion theory code CITATION in (θ,r,z) coordinate system.