"Analysis of CCFL phenomena by CATHARE 1 v1.3 and comparison with results of RELAP5/MOD2 code", 8th CATHARE CUC Meet., Grenoble (F), March 23-25, 1988

Abstract

Cathare cod was developed in France by (primarily) CEA (Commissariat a l’Energie Atomique). UNIPI was the first institution outside France which received the code produced in the Grenoble CEA Center CENG. The activity of independent code assessment was financially supported by EURATOM within the FP1, FP2 and FP3 programs (UNIPI took benefit of those). The present report discusses capabilities of the Cathare code in predicting Counter Current Flow Limiting (CCFL) phenomenon. CCFL data, involving liquid and steam flowing countercurrent, were measured in the Upper Tie Plate (UTP) of a specific nuclear fuel bundle available at the Hannover University in Germany. A comparison was mad between Cathare results, experimental data and results obtained by Relap5 code. The activity opened a several years cooperation between UNIPI and CEA which involved several UNIPI students working in Grenoble for long time periods (6- 12 months)