April 14th, 2011 – Fukushima Daiichi Units 1, 2, and 3 Chronologies of Status

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From:Marksberrv. Don
To:RST01 Hoc; Tinkler. Charles; Schagerow. Jason; Esmaili Hossein” Helton. Donald; Sala. Michael Thor John;Garmon. David
Cc:Lee. Richard; Demoss. Gary; Covne. Kevin Stutzke. Martin; Sallev. MarkHenry; Siu. Nathan; Joy L Remoe,Correia. Richard; Coe. Doug
Subject: Plant Status Chronologies of Units 1, 2, and 3
Date:Thursday, April 14, 2011 9:50:36 AM
Attachments:1RES (4-14-2011) Fukushima Dauichi Chronology. Units 1.2.3.xlsx

Here is this morning’s edition of the plant status chronology and data tables for Units 1, 2, and 3. It does not include radiological information.

Please note that the info sources are official press releases from TEPCO and NISA. No other sources or speculations were included.


4/14/11 The TEPCO reference column for Unit 2 was inadvertently shifted a line or two. I believe this has been corrected.

4/14/11 We are considering stopping the updates of the parameter spreadsheets, since other more current sources are becoming readily available. More to come….

4/14/11 INL-DOE has started a timeline for all 6 units at Fukushima Daiichi. We will assess whether our efforts can be combined with INL’s to avoid duplication and conflicts within the Federal community. More to come….

4/13/11 Earlier event descriptions were revised to match the press release text a little closer. Also, select Article 15 reports and emergency declarations (from TEPCO to NISA) were added for those that may imply change in unit status.


Don Marksberry
Division of Risk Analysis
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
21 Church Street
Rockville, Maryland 20850-4207
Phone: 301-251-7593
E-mail: [email protected]
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Mail Stop: C-4C07M
Washington, D.C. 20555-0001

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