Analysis of BEATRIX-II tritium release results using MISTRAL

Abstract The MISTRAL code was used to analyze the BEATRIX-II experimental results of Li 2 O ring samples. The analysis included the change in inventory due to different temperature transients, the end-of-life inventory of the Phase I ring sample, and the analysis of the transient tritium release history of both Phase I and Phase II ring samples. The change in inventory results were used in order to obtain a set of input data that will reproduce these results. Using the same input data, MISTRAL was able to predict the end-of-life inventory of the sample. In all the cases, the calculations indicated that most of the tritium was present in the bulk, leading to the assumption that LiOT formation inside the grains is the key mechanism in controlling the tritium inventory in these cases.