APPLICATION OF THE RESPONSE SURFACE METHOD OF UNCERTAINTY ANALYSIS TO ESTABLISH DISTRIBUTIONS OF FRAP-S3 CALCULATED STORED ENERGY FOR PWR-TYPE FUELS

摘要

An uncertainty analysis was performed using the steady state fuel rod analysis program, FRAP-S3, to establish burnup-dependent distributions of fuel stored energy. The response surface methodology used for conducting the analysis is briefly discussed. The distributions of fuel stored energy obtained as a result of the uncertainty analysis reflect uncertainties in the FRAP-S3 model in addition to uncertainties in PWR fuel rod design and operating power. An assessment is made of the adequacy of these distributions to represent initial accident conditions for a typical PWR core. The relative influence individual input variables on the integal uncertainty of computed output is discussed. Applications of the results of this study are presented. Emphasis is placed upon the utilization of the results to quantify evaluation model conservatism. (ERA citation 04:040828)