Head Loss Test for the APR1400 Sump Strainer

If a loss of coolant accident (LOCA) were to occur, it is postulated that this LOCA could generate and transport debris to the emergency core cooling suction strainer. The debris that could accumulate on the strainer may form a debris bed and increase the head loss across the strainer. The purpose of this test is to develop data to validate the sump strainer performance using conservative conditions. Flow sweeps were also conducted to adjust the head loss over the range of fluid temperatures required for the strainer operation. Test results of the head loss across an APR1400 sump strainer are presented, and compared with the allowable head loss to confirm net positive suction head (NPSH) margin. The test results were measured in a fluid approximately 31 .deg. C. The final head loss value is the sum of the clean strainer head loss(7.62 cm-water) and debris head loss(24.7 cm-water). The strainer produces a final head loss of 32.32 cm-water which is less than the submergence(61 cm) at the full range of In-containment Refueling Water Storage Tank (IRWST) temperature