CATHENA Model of the CANDU 9 End Shield Cooling System in the Event of Loss of Forced Circulation

Abstract

The CANDU 9 shield cooling system is designed to facilitate enhanced thermosyphoning of the end shield inventory in the event of a loss of forced circulation. This paper describes the CATHENA model of the CANDU 9 shield cooling system and the simulation results of the loss of forced circulation event. In addition, this paper describes the results of a complete loss of flow in the end shield. These results show that the CANDU 9 end shield cooling system will continue to perform its function, thus ensuring lattice tube and fuel channel integrity under the postulated upset conditions.