Integral effect test on cooling performance of hybrid safety injection tank

• Published in: Annals of nuclear energy 2019-01, Vol.123, p.110-118
• Main Authors: Ryu, Sung Uk, Lee, Sun Il, Kim, Yu Na, Yi, Sung-Jae
• Format: Article
• Language: English
• Subjects: Hybrid safety injection tank; Integral effect test; Passive emergency core cooling system; Small break loss of coolant accident
• ISSN: 0306-4549; 1873-2100
• DOI: 10.1016/j.anucene.2018.09.023

•Integral effect test to inspect the performance of passive emergency core cooling system.•The various thermal hydraulic phenomena occurring inside SIT were investigated.•The theoretical condition for injection of Hybrid SIT coolant was derived.•The appropriate operating condition of auto depressurization system was suggested. This paper reports an experimental research on the performance of the passive emergency core cooling system (PECCS) using an integral effect test facility in Korea Atomic Energy Research Institute (KAERI). The PECCS consists of two hybrid safety injection tanks (H-SIT), two medium pressure safety injection tanks (MP-SITs) and an automatic depressurization system consisting of four stages. In this study, an integral effect test (IET) was conducted on a loss of coolant accident (LOCA), which requires the operation of the primary makeup system. The H-SIT (SITs #1 and #3) injection starts successfully when the primary side pressure falls to 10.0 MPa, and the MP-SIT (SITs #2 and #4) injection starts when the pressure falls further to 4.21 MPa. The coolant injection of H-SIT occurs intermittently at certain points of time, rather than continuously. It can be seen that the flow generation of the H-SIT near the pressure plateau occurs exactly when the secondary side is depressurized.