Sensitivity of SBLOCA Analysis to Model Nodalization
Recent attention was focused (by Semiscale test S-UT-8) upon the possibility for primary liquid to be retained in the steam generators during a predicted SBLOCA, permitting core uncovery prior to loop seal clearance. If the steam generator behavior is sensitive to the choice of nodalization in the steam generator, SBLOCA analytical results will be similarly sensitive. The Division of Systems Integration of the U.S.N.R.C. has suggested1 that vendor codes be reviewed to determine if they adequately model liquid storage in the U-tubes, since computed consequences of a SBLOCA might be more severe when this phenomenon is included.
KeywordsBreak Size Steam Generator Global Parameter Countercurrent Flow Secondary Side
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