Examination of uncertainty in late reflood phase behavior of APR1400 LBLOCA
Conference
·
OSTI ID:21160742
- Korea Hydro and Nuclear Power Co., Ltd., Munji-Dong Yusung-Gu, Daejeon, 103-16 (Korea, Republic of)
- Korea Power Engineering Co., Inc. (Korea, Republic of)
APR1400 is an evolutionary PWR developed in Korea. The ECCS of APR1400 has been improved by adopting 4 safety injection pumps and fluidic devices in safety injection tanks. Also, APR1400 adopted direct vessel injection (DVI) for its ECCS injection: safety injection water is injected into the reactor vessel downcomer directly. The ECCS performance of APR1400 during the double-ended cold leg break LOCA, specially during the late reflood phase, is examined with the KEPRI Realistic Evaluation Methodologies (KREM). The applicability of KREM to the prediction of APR1400 specific thermal hydraulic phenomena in downcomer during the LBLOCA is examined first and the preliminary best estimate analysis is performed for the double-ended cold leg break LOCA. The analysis results show that there is no degradation of core coolability and reheating phenomena during the late reflood phase. All fuel rods are quenched in the early reflood phase during the fluidic devices are active, which shows the effectiveness of the fluidic devices in mitigating the LBLOCA. (authors)
- Research Organization:
- American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 21160742
- Country of Publication:
- United States
- Language:
- English
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