Analysis of Control Rod Reactivity Worths for AVR Power Plant at Cold and Hot Conditions.

Abstract

The control rod worths of the AVR power plant for the cold and hot conditions were analyzed to verify an analysis method of reflector control rod worths. In the analysis method, the neutron-flux-weighting method was used to obtain the effective group constants of the control rod inserted in the graphite nose. The control rod worths were calculated with the core analysis code system for the High Temperature engineering Test Reactor (HTTR). The experimental values of the control rod worths were 6.47 and 6.81Xdp for the cold and hot conditions, respectively. The differences between the experimental and analytical values for the cold and hot conditions were 2 and l o % , respectively. From these results, it was made clear that the analysis method applied here predicts well the control rod worth of the AVR power plant and is applicable for the nuclear designs of reflector control rods of future small HTGRs.