Nodalization study for BETHSY experiment
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abstract
The BETHSY experiment 9.1.b was used to assess different versions of the RELAP5 computer code using three various detailed nodalizations. This experimental transient scenario involved a scaled 2 inches cold leg break without high pressure safety injection and with delayed operator action for a secondary system depressurization. In order to optimize details of nodalization in regard to satisfactory accuracy a detailed study of different RELAP5 codes and nodalization was performed. Qualitative evolution of RELAP5 code was also analyzed.