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ATHLET MOD 1.1 C Analysis of the Loss of RHR System During Midloop Operation Experiment Performed at the Bethsy Facility

A simulation of the loss of Residual Heat Removal (RHR) system during midloop operation was performed using the ATHLET Mod 1.1 C system code. The analysis is a posttestcalculation of the 6.9 c test performed on the BETHSY facility on April 14, 1992. Test 6.9 c has been analyzed within an OECD/NEA/CSNI project as an open exercise named International Standard Problem (ISP)38. BETHSY is an integral test facility which simulates a three loop 900 Mwe (2775 MWt) Framatome PWR. The test consisted in a loss of RHR system at a cold shutdown and midloop condition (i.e. the liquid level was at the axis of the cold legs) and at atmospheric pressure. Along with loss of RHR system, the pressurizer and Steam Generator (SG) 1 outlet plenum manways were open. In the paper the results of the ATHLET calculations were assessed against the measured data. The initial conditions were determined during the first 200 s of the simulation. The transient was simulated for 8800 s.

NPP safety analyses; residual heat removal system; midloop operation

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