The “Ultimate Heatsink” vs the Condensers in Each Reactor Building. And the Torus as a heat sink

Paul Langley's Nuclear History Blog

World Nuclear Association, Fukushima Accident 2011

Quote: ” Then 41 minutes later the first tsunami wave hit, followed by a second 8 minutes later. These submerged and damaged the seawater pumps for both the main condenser circuits and the auxiliary cooling circuits, notably the Residual Heat Removal (RHR) cooling system. They also drowned the diesel generators and inundated the electrical switchgear and batteries, all located in the basements of the turbine buildings (the one surviving air-cooled generator was serving units 5 & 6). So there was a station blackout, and the reactors were isolated from their ultimate heat sink. The tsunamis also damaged and obstructed roads, making outside access difficult. ” end quote

In the language of the industry perhaps all of the above fair and reasonable. In the visual images of the Fukushima Diiachi post disaster site, when reading the above the focus is drawn to those…

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