Prediction of Boiling-Induced Natural Circulation Flow in an Inclined Channel with Non-Uniform Flow Area
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
C8-1 Advanced Design Features for Severe Accident Mitigation including Combustion and Fires

Kwang Soon Ha (Korea Atomic Energy Research Institute)
Fan-Bill Cheung (The Pennsylvania State University)
Jinho Song (Korea Atomic Energy Research Institute)
Rae Joon Park (Korea Atomic Energy Research Institute)
Sang Baik Kim (Korea Atomic Energy Research Institute)


The boiling-induced natural circulation flow in the engineered cooling channel is modelled and solved by considering the conservation of mass, momentum and energy in the two-phase mixture, along with the two-phase friction drop and void fraction. The model has been applied to estimate the induced mass flow rates through a uniform and non-uniform annular gap between the reactor vessel and insulation under the IVR-ERVC conditions, and also the engineeredcorium cooling system of an ex-vessel core catcher during a severe accident for various system parameters including the channel gap size, inlet diameter, inlet subcooling, and wall heat flux.

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