In the PSB-VVER Integral Test Facility (ITF), extensive experimental investigations on the thermal hydraulic behavior of a VVER-1000 type reactor under LOCA accidents have been carried out during 2001. The general aim of the experiments is to contribute to a better understanding of accident sequences and to provide a detailed data base for the validation of Russian and Western computer codes. This paper presents the results of an 11% cold leg break experiment (CL-11-05) assuming loss of off-site power. The presented experiment belongs to a set of tests with a spectrum of break area in the PSB cold leg carried out in the summer 2001. The results of the post-test analyses using TRAP code are presented. A short description of the TRAP code mathematical model is also given.

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