Environmental Envelope of SBLOCA for Wolsong Unit 1 Environmental Qualification

An equipment environmental qualification(EQ) is required to guarantee the safety function of safety related systems, structures and components during the harsh conditions which occur as a consequence of an accident. The first step of an EQ program is to identify the events causing the harsh environmental conditions and to determine the environmental conditions. These environmental envelopes are generated by two steps, the generation of mass and energy release data and an analysis of the containment pressure and temperature. This paper shows the procedure and results of building a environmental envelopes for Small Break LOCA which is one of the most severe DBAs, specially in the view of long term