April 14th, 2011 – Debris in lower head – Lower Head Failure

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From: Dube, Donald
Sent: Thursday, April 14, 2011 10:08 AM
To: Fuller, Edward
Subject: trend
Attachments: SOARCA plots.doc

Debris location into lower head: both RPV pressure and containment pressure rise (-13.5 hr)

Lower head failure: RPV pressure decreases while containment pressure increases (-20 hr)

Fukushima Unit 2 accident progression is protracted because of various mitigation measures taken.


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