The Design of Light Water Reactors - The Risks of Nuclear Energy Technology - page 71

Fig. 3.30 ABWR—Containment structure [ 22 ]
- three automatic low pressure core flooding systems. These pumps are motor-
driven. The water is taken from the large suppression pool. The three low
pressure core flooding systems are interconnected by valves with the three
residual heat removal systems. In this case the water is cooled in heat
exchangers. The residual reactor heat removal systems are applied for cooling
of the core after reactor shutdown (residual heat conditions).
- Suppression pool cooling
The three residual heat removal systems are also used to cool the larger
suppression pool in case its water overheats as a consequence of core melt
accidents.
- Containment spray cooling system
Two of the three residual heat removal systems can also supply the water for
spray systems in the wet well and in the dry well part of the inner containment.
This spray water can condense steam in the wet well or in the dry well part of the
inner containment.