Containment pressure and temperature envelopes for a CANDU reactor equipment environmental qualification

An equipment environmental qualification 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 environmental qualification program is to identify the events causing the harsh environmental conditions and to determine the environmental conditions. This paper shows a systematic approach to generate the containment pressure and temperature envelopes which will be used for an equipment environmental qualification. These envelopes are generated by two steps, the generation of mass and energy release data and an analysis of the containment pressure and temperature. Finally, the containment pressure and temperature envelopes which cover all the transients with a margin are determined for the large break loss of coolant accident and the main steam line break.