WREM-based generic PWR ECCS evaluation model. 3-loop Westinghouse large break example problem (using September 26, 1975 model)

Appendix D is presented as a demonstration of the WREM/ENC calculational procedure using a typical Westinghouse three-loop NSSS. The calculational procedures used are in accordance with the ENC PWR evaluation model as described in XN-75-41, Volumes I and II and supplements, including Supplement 5, Revision 1 (the September 26, 1975, model). The loss-of-coolant accident investigated was a double-ended guillotine cold leg break. Three analyses are presented which include discharge coefficients (C/sub D/) of 1.0, 0.6 and 0.4. The investigation involved calculations using the following primary WREM/ENC codes: RELAP4-EM for blowdown and hot channel analysis, TOODEE2 for hot channel during refill and reflood, and RELAP4-EM FLOOD for core reflood analysis. This appendix includes descriptions of all portions of the loss-of-coolant analysis with example problem input. Principal results of these analyses are contained in Tables. These results include peak clad temperatures and metal/water reaction percentages. Also included are summaries of the transient time sequences for major events. All salient results from the three analyses are presented in graphical form