Results of Carolina Power and Light Company’s Analysis of Brunswick Unit 1 Start-Up Tests Using RETRAN

Carolina Power and Light Company has completed a set of benchmarks of a RETRAN computer model representing its boiling water reactor Brunswick Unit 1 Nuclear Power Plant. These benchmarks consist of simulating five transients initiated during the Brunswick 1 Startup Test Program and comparing the calculated plant response to data taken during each transient. A description of the methods used to generate the one-dimensional kinetics input is provided along with a brief description of the RETRAN model. The results of the benchmarks are presented and the portions of the model qualified by the results are summarized. The benchmarks show that the model is capable of accurately simulating a wide range of transients. The Peach Bottom turbine trip benchmarks are being performed to verify the predicted neutronic response for conditions representative of those encountered during licensing transients.