Modelling of Xe-135m for Evaluation of the CANDU6 Power Coefficient of Reactivity

Abstract

There was an experimental evaluation of the PCR of a CANDU6 reactor in Korea in 2012. In the assessment, the PCR was evaluated by a methodology which requires the estimation of the reactivity variation due to Xe, liquid zone controller (LZC), etc. Unlike the conventional Xe analysis, Xe-135m was also considered in this work to estimate the total Xe worth during transient. The impact of Xe-135m on the experimental evaluation of CANDU6 PCR was evaluated based on the Xe-135m cross section data of TENDL-2014. As a result, the evaluated PCR was reduced by about 0.2 pcm/%P due to the consideration of Xe-135m.