CFD Model of CANDU Calandria Vessel Retention During Severe Accidents
NURETH-14 - 2011 September 25-30


Presented at:
NURETH-14
2011 September 25-30
Location:
Toronto, Canada
Session Title:
C1-1 Molten Core Natural Convection, Physico-Chemical Phenomena, and Direct Containment Heating by D

Authors:
Fei Song (Atomic Energy of Canada Limited)
Boris Lekakh (Atomic Energy of Canada Limited)
Ken Hau (Atomic Energy of Canada Limited)
  

Abstract

A CFD model is developed for the calandria vessel retention of generic CANDU ®1 reactors, including the Enhanced CANDU 6 ®2 (EC6®2), the Advanced CANDU Reactor®3 (ACR- 1000®3), and the CANDU 6, during a postulated severe accident. The model is focused on the thermal hydraulics in a full-scale calandria vessel when terminal debris bed is formed during a loss of coolant accident, which is bounding in terms of potential challenge to calandria vessel integrity. The CFD model is benchmarked against MAAP4-CANDU analysis of ACR-1000. The results show that with ex-vessel cooling available, the core debris can be well contained inside the calandria vessel, demonstrating the successful in-vessel retention strategy in the ACR-1000 severe accident management.

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