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2017-07-22 10:53:46

Simplified cross-section sketch of a typical BWR Mark I containment as used in units 1 to 5 at Fukushima power plant. RPV: reactor pressure vessel DW: dry well enclosing reactor pressure vessel. WW: wet well - torus-shaped all around the base enclosing steam suppression pool. Excess steam from the dry well enters the wet well water pool via downcomer pipes. SFP: spent fuel pool area SCSW: secondary concrete shield wall

Image uploaded by Karen Graham
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