Evaluation of RELAP5/MOD1 for Analysis of Steam Generator Tube Rupture Transients in OTSG Plants
The RELAP5/MOD1, Cycle 18 code (1) was used to evaluate the system response of a Babcock and Wilcox plant having 177 fuel assemblies and a lowered loop configuration to the rupture of single tube or multiple tubes in one or both once-through steam generators (OTSGs). RELAP5 proved to be a valuable analytical tool in computing these long duration transients. Modeling of the ruptured tube and mass error accumulation were the key areas of difficulty. The areas of difficulty and final solutions are discussed.
KeywordsFuel Assembly Steam Generator Mass Error Safety Valve Steam Generator Tube
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