Status of TRAC-PF1/MOD1 independent assessment at Sandia

Sandia's TRAC-PF1/MOD1 independent assessment program is part of a multi-faceted effort sponsored by the NRC to determine the ability of various systems codes to predict the detailed thermal/hydraulic response of LWRs during accident and off-normal conditions. TRAC-PF1/MOD1 is being assessed against test data from various integral and separate effects experimental facilities. Results from our PKL natural circulation, NEPTUNUS pressurizer, B and W OTSG, Northwestern University condensing flow, and LOBI large break A1-04R and intermediate break B-RIM test analyses were reported at least year's WRSRIM; this paper presents the results of more recent work for Northwestern University perforated-plate CCFL, Dartmouth vertical tube countercurrent flow, LOFT large break L2-5, and Semiscale intermediate break S-IB-3, feedwater line break S-SF-3 and steamline break S-SF-5 tests. In the course of our TRAC-PF1/MOD1 assessment calculations, a number of coding, documentation and modeling inadequacies have been identified and reported to the code developers at LANL