Diversified emergency core cooling in CANDU with a passive moderator heat rejection system
- Atomic Energy of Canada Limited, Ontario (Canada)
Contemporary Canada deuterium uranium (CANDU) reactor designs employ redundancy and a considerable level of diversity in the safety systems. Thus redundancy and a high level of diversity exist in the two safety shutdown systems, which, in turn, are independent of the reactor regulating system, Also, a considerable level of diversity exists in the two emergency core cooling systems: the emergency coolant injection system and the CANDU low-pressure low-temperature moderator, which, in surrounding the fuel channels, can act as a redundant heat sink. However, common cooling water and common electrical supplies are used for heat rejection from the emergency coolant and from the moderator. Scenarios involving failures in these common supplies are the main contributors to the CANDU core-melt frequency of 4 x 10{sup -6} yr{sup -1}. The purpose of this work is to develop a passive moderator heat rejection system that, in avoiding the use of pumps and electrical supplies, enhances the independence of the moderator as a heat sink.
- OSTI ID:
- 411825
- Report Number(s):
- CONF-951006--
- Journal Information:
- Transactions of the American Nuclear Society, Journal Name: Transactions of the American Nuclear Society Vol. 73; ISSN TANSAO; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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