Scaling effects predicted by W̱COBRA/TRAC for UPI plant best estimate LOCA Original Research Article

The W̱COBRA/TRAC-MOD7A, Rev. 1 code is currently licensed for best estimate LOCA analyses of 3 and 4 loop PWRs. As part of a licensing effort to extend the code application to plants equipped with upper plenum injection (UPI), scaling effects predicted by the code are investigated. The scaling effects of UPI tests were obtained through data analyses and summarized in . The scaling subjects are: breakthrough flow area, downflow rate into the core, hot leg water carryover, and liquid level in upper plenum. The test facilities that supplied the data include UPTF and CCTF. In this report, the scaling trend is obtained from W̱COBRA/TRAC analyses of CCTF Run 72 and Run 76 (scaling factor 0.091), UPTF Tests 20A, 20B, and 20C (scaling factor 2.1), and a typical UPI plant (scaling factor 1.0). The predicted scaling trend is found to agree well with the test data.