Lower levels are ignored. A single ventilation input and output are used in the CFD model, which represents half the building and fuel pool. The ventilation opening is 4 m 2 and is shown in Figure 3. The inlet flow provides 2 building volumes of air to the building every hour. Sensitivity studies are performed on this value.
Air enters the containment through the inlet vent and is heated by the fuel.
Inlet air is set at 27 o C. Air is exhausted on the opposite end of the building through a similar vent opened to the atmosphere. The inlet and outlet vents are positioned 2.68 m from the back wall and ceiling of the containment building. Most of the predictions assume the external building walls are adiabatic. Sensitivity studies are done on the overall heat transfer coefficient at the side walls and ceiling of the containment building. This range covers various wall types subjected to a 15 mph outdoor wind speed.