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NPP Krško RELAP5 Analysis of the Scaled Loss of RHR Experiment Scenario

Three sensitivity study calculations of the BETHSY test 6.9 c scaled to NPP Krško (NEK) using RELAP5/mod 3.2.2 code were performed. Aims of the sensitivity study calculations and of the comparison with experimental data are threefold: - to prove the appropriateness of the developed RELAP5/mod 3.2.2 NPP Krško nodalization in the analysis of the transient at low power and low pressure. - to assess the influence of different scaling approaches and initial conditions in order to help better characterize physical phenomena during midloop operation and choose proper scaling as well as transient modeling approach. - to determine the consequences of the Loss of RHR transient with PRZ and SG manway open.

Safety analysis; scaling; residual heat removal system; experiment

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