Proceedings of the Korean Nuclear Society Conference (한국원자력학회:학술대회논문집)
- 1997.05a
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- Pages.458-463
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- 1997
Evaluation of Transient Natural Circulation Behavior during Accident in Low Power /Shutdown Condition of YGN Units 3/4
- Bang, Young-Seok (Korea Institute of Nuclear Safety) ;
- Kim, Kap (Korea Institute of Nuclear Safety) ;
- Seul, Kwang-Won (Korea Institute of Nuclear Safety) ;
- Kim, Hho-Jung (Korea Institute of Nuclear Safety)
- Published : 1997.05.01
Abstract
A transient natural circulation behavior during a LOCA at hot-standby operation is evaluated for YGN Units 3/4. The plant initial condition is determined within the EOP limitation as suitable to hot-standby mode and the transient scenario is prepared as relevant to evaluation of transient natural circulation. A 0.4% cold leg break with loss of off-site power is calculated with RELAP5/MOD3.2, whose predictability has been verified for SBLOCA natural circulation test, S-NC-8B. Through one hour transient analysis, it is found that the plant has its own decay heat removal capability by natural circulation following a LOCA, at hot-standby mode. Additional calculation is performed to investigate an effect of HPSI flow on natural circulation.
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