2635 Improvement of IMPACT/SAMPSON Code and Some Analyses with It

Abstract

The Nuclear Power Engineering Corporation (NUPEC) has developed a severe accident analysis code "SAMPSON". SAMPSON's distinguishing features include inter-connected hierarchical modules and mechanistic models covering a wide spectrum of scenarios ranging from normal operation to hypothetical severe accident events. Each module included in the SAMPSON also runs independently for analysis of specific phenomena assigned. SAMPSON has been applied to various problems, such as OECD ISP-45 and -46, severe accident phenomena in typical PWR and BWR plants, hydrogen detonation of Hamaoka-1 BWR plant, and so on. Through these analyses, however, some points to be improved have been specified and computing performance was found to become considerably deteriorated for real plant analyses compared with experimental analyses. Some examples of improvements of SAMPSON modules are shown in this paper.