Best-Estimate LOCA Analysis over the Full Spectrum of Postulated Breaks Using Westinghouse FULL SPECTRUMTM LOCA Methodology
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
O11-1 Westinghouse Full Spectrum LOCA – A Realistic LOCA Evaluation Model Applicable to the Full Ran

Michael Shockling (Westinghouse Electric Company)
Cesare Frepoli (Westinghouse Electric Company)
Katsuhiro Ohkawa (Westinghouse Electric Company)


In this paper, the ability of the Westinghouse FULL SPECTRUMTM LOCA (FSLOCATM) best-estimate code to adequately capture the phenomena most important and dominant for small, intermediate, and large breaks of the cold leg is demonstrated for a three-loop Westinghouse pressurized water reactor (PWR).  Nominal scenarios, in which typical values are assumed for uncertainty parameters, illustrate the influence of break size on the important system-level phenomena predicted by the code.  The relatively more limiting predictions of peak cladding temperature for larger breaks confirm the analysis margin achieved for small breaks by analyzing in a best-estimate manner.

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