Fission gas release during the SPX1-HCDA

This paper analyses the fission gas release kinetics during the SPX1-Hypothetical Core Disruptive Accident (HCDA) from the stand point of the radiological and mechanical consequences. The SPX1-HCDA transient taken into account in this paper is a Loss of Flow (LOF) driven Transient Over Power accident (TOP). The beginning of equilibrium cycle (BOEC) and the end of equilibrium cycle (EOEC) were considered. For the steady state nominal power conditions a core chart of fission gas produced and released (inside the pin) was calculated with average and maximum burn up values. During the LOF phase, temperature and gas pressure evolutions occur within the clad; additionally during the TOP phase, fuel clad interaction and molten fuel clad contacts occur. (orig./RW)