Subchannel and Rod Bundle PSBT Simulation With CATHARE-3

Abstract

This paper presents the assessment of CATHARE3 against PWR subchannel and rod bundle tests of the PSBT benchmark. Noticeable measurements were the following : void fraction in single subchannel and rod bundle, multiple liquid temperature at subchannel exit in rod bundle, DNB power and location in rod bundle. All these results were obtained both in steady and transient conditions. Void fraction values are satisfactory predicted by CATHARE3 in single subchannels with the pipe module. More dispersed predictions are obtained in rod bundles with the 3D module at subchannel scale. Single phase liquid mixing tests and DNB tests in rod bundle are also analyzed.