An Approach to Modelling the Effects of a Small LOCA With a Loss of ECI Under Natural Circulation Conditions in a CANDU Reactor

Abstract

This paper presents a critical review of information pertaining to the degradation of fuel cooling during a small loss of coolant accident (SLOCA) in conjunction with a loss of emergency cooling injection (LOECI) and a loss of forced circulation in a CANDU reactor. This review provides the background information necessary to facilitate the creation of a computer program that models the thermalhydraulic behaviour during the postulated severe accident. The model will represent the thermalhydraulic variables and event timing associated with flow and heat transfer degradation in multiple-parallel fuel channels connected between the inlet and outlet reactor headers.