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http://dx.doi.org/10.3795/KSME-B.2012.36.5.553

Heat-up Calculation for the Auxiliary Feed Water Pump Room at Ulchin Units 3 and 4 for Loss of HVAC Accidents  

Yoon, Churl (Nuclear Hydrogen Reactor Technology Development Division, Korea Atomic Energy Research Institute)
Park, Jin-Hee (Integrated Risk Assessment Division, Korea Atomic Energy Research Institute)
Hwang, Mee-Jeong (Integrated Risk Assessment Division, Korea Atomic Energy Research Institute)
Han, Sang-Hoon (Integrated Risk Assessment Division, Korea Atomic Energy Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.5, 2012 , pp. 553-562 More about this Journal
Abstract
Computational Fluid Dynamics (CFD) analysis has been performed to estimate the air temperature inside an Auxiliary Feed Water (AFW) Motor-Driven (MD) pump room for the case where there is loss of Heating, Ventilation, and Air-Conditioning (HVAC). A transient calculation for the closed pump room without cooling by any HVAC system shows that the volume-averaged air temperature reaches around $60^{\circ}C$ for a transient period of 8.0 h. From previous studies, the external air and surface boundary temperatures are assumed to increase slowly starting from an initial temperature of $35^{\circ}C$. For the cases where the door is opened at 2, 4, and 6 h after the initiation of HVAC failure, the average air temperature promptly drops by about $4^{\circ}C$ when the door is opened and then slowly increases. The current calculations based on the CFD technique predict the rate of increase of air temperature to be lower than that determined by previous conservative calculations on the basis of a lumped model.
Keywords
Auxiliary Feed Water; HVAC; Operability; Natural Convection; CFD; Porous Media; Pump Room;
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