DEVELOPMENT OF RELAP5 NODALIZATION FOR IRIS NON-LOCA TRANSIENT ANALYSES

Abstract

RELAP5/MOD 3.3 code has been selected as the main computer code for performing transient and accident calculations among members of the IRIS consortium. A rather detailed nodalization of the reference IRIS design has been developed with a basic set of protective functions and controls. The Engineered Safety Features of the concept are being also incorporated in the nodalization. This paper discusses some of the features of the developed model and the problems discovered during initial steady state and transient simulations of the nodalization.