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NPP Krško RELAP5/MOD2 Analysis of Scaled BETHSY 6.2TC Test

The present document deals with the RELAP5/MOD2 analysis of the NPP Krško scaled small break LOCA counterpart test 6.2TC performed in the BETHSY facility. BETHSY is a PWR simulator (integral test facility) located in Grenoble, France. The reference nuclear power plant is a three loops, 900 MWe (2775 MWth), Framatome PWR. The volume scaling factor is 1:100 (more precisely 1.032*10-2). NPP Krško is a Westinghouse two loops, 632 MWe, plant located in Krško, Slovenia. The counterpart test is essentially a small break LOCA originated by a rupture in the cold leg between the pump and the reactor vessel. The break is "side oriented" in the pipe and has an area equivalent, roughly, to 6% of the area of the main pipe. The sequence of interventions of the various systems is typical of the kind of transient in a plant. The small break LOCA was calculated using the nodalization of the NPP Krško developed at the Faculty of Electrical Engineering and Computing for the scaled and nominal boundary and initial conditions. The scaling factor was the ratio of the NPP Krško volume to the BETHSY volume (57.514). The results of the scaled calculation were compared with the experimental data and with the results of a previous calculation performed by using the nodalization of the BETHSY facility. Sensitivity studies were carried out for the scaled and nominal calculations. The obtained results prove that the nodalization of the NPP Krško, developed at the Faculty of Electrical Engineering and Computing, can be used for analyzing small break LOCA experiments.

scaling; counterpart test; small break LOCA

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