Analysis on Thermal Load Response of the In-Vessel Retention During a Severe Accident
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
C1-1 Molten Core Natural Convection, Physico-Chemical Phenomena, and Direct Containment Heating by D

Jae Ryong Lee (Korea Atomic Energy Research Institute)
Rae Joon Park (Korea Atomic Energy Research Institute)
Seong Wan Hong (Korea Atomic Energy Research Institute)


A thermal load from the molten pool in the lower plenum to the reactor vessel during a severe accident has been analyzed. The configuration of the molten pool was considered as a two-layer. A heat flux distribution, crust thickness and vessel thickness were mainly investigated in this study. Non-linear Newton-Raphson iteration method was easily applied to solve a set of governing equations. Of many severe accident sequences, SBLOCA (Small Break Loss-Of-Coolant Accident) and LBLOCA (Large Break Loss-Of-Coolant Accident) without SI (Safety Injection) in the APR1400 were considered. From the results, the focusing effect in light metallic layer could be seen and other important parameter was also explained.

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