System scaling analysis for modeling small break LOCA using the FULL SPECTRUM LOCA evaluation model

The top-down scaling in the blowdown, natural circulation, loop seal clearance, and boil-off phases in the ROSA-IV/LSTF SB-CL-02 test was investigated relative to the three-loop PWR SBLOCA transient. The top-down scaling analysis results indicated that there are small distortions originating from the atypical steady state and transient in the ROSA-IV/LSTF test. In general, the system scaling analysis demonstrated that the ROSA-IV/LSTF tests are well scaled IETs for examining the behavior of Westinghouse three-loop PWRs under the SBLOCA transient conditions, and are uniquely suited in the SBLOCA validation matrix of the FSLOCA evaluation model.