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Fukushima Daiichi Accident Reports

There are a number of reports on the Fukushima Daiichi accident which have been prepared by either industrial or regulatory bodies. This page will collect links to these reports as they become available, in no particular order.

Report of Japanese Government to the IAEA Ministerial Conference on Nuclear Safety: Click Here

Japan Nuclear Technical Institute report: Click Here

Japanese Ministry of Economy, Trade and Industry comprehensive report on the accident and its implications: Click here

Japanese Ministry of Economy, Trade and Industry second report to IAEA: Click here

Tokyo Electric Power Company - Fukushima Daiichi Nuclear Accident Analysis Report (Interim): Click here

Tokyo Electric Power Company - Supplementary Interim Report (additional to above link.) Click here

Tokyo Electric Power Company - Fukushima Nuclear Accident Analysis Report, June 20, 2012.  Final version of report; 503 pages.  Click here.

Tokyo Electric Power Company - Fukushima Daiichi: A One Year Review. Multiple links on this page covering accident, accident response, mid-term and long-term plans. Click here.

NEW APRIL 2012:  Sandia National Labs "Fukushima Daiichi Accident Study (As of April, 2012)"  MELCOR analysis and comparison to known actual accident data.  Click here.

NEW AUGUST 2012: TEPCO Fukushima Nuclear Accident Analysis Report / June 20, 2012 / Executive Summary of the report including new analysis and response. Click here.

ICANPS Investigation Committee on the Accident at Fukushima Nuclear Power Station (Japan)  Click here.

NAIIC National Diet of Japan Fukushima Accident Investigation.  Click here.

United States Nuclear Regulatory Commission - Near Term Task Force report on Fukushima Daiichi: Click here

Office for Nuclear Regulation (UK) Fukushima Report: Click here

Institute of Nuclear Power Operations / Fukushima Daiichi Accident Timeline (hosted at, published by Nuclear Energy Institute): Click here to access page with PDF file link. Click here for the August 2012 INPO addendum (.pdf file link) via NEI's website

American Nuclear Society. ANS Special Committee on Fukushima Report - special ANS web page with links to the full Committee report, with appendices, Committee member bios, videos, and more. Click here to access.

International Atomic Energy Agency - Initial Fact Finding Mission Summary: Click here

World Nuclear Association - Fukushima Accident summary paper: Click here

FORATOM (Europe) Fukushima Accident papers (multiple): Click here

Nuclear Safety and Quality Assurance Meeting (Japan) / Committee Opinion on TEPCO Midterm Fukushima Report: Click here APR Note: This is a brief, pointed, and very level assessment of some of the key issues faced during the accident and TEPCO's explanations thereof. This is an important early "lessons learned" document from November 2011.


Response to Fukushima Daiichi in the United States.

Nuclear Energy Institute has an excellent page linking many NEI resources that completely describe the US nuclear industry's responses to the accident in Japan, as well as how the industry has coped with natural disasters here. This is a major clearinghouse of Fukushima-responsive information. Click here to access NEI Fukuahima response page.

NEI White Paper on the GE Mk I containment in the United States. Click here

GE REPORTS: Mk I containment history. Click here.

GE REPORTS: Containment vents. Click here.


World Health Organization, May 2012:

Preliminary Dose Estimation from the nuclear accident after the 2011 Great East Japan Earthquake and Tsunami. Click here.



METI / TEPCO report on Unit 4 reactor building, May 2012

TEPCO reaffirms seismic safety of unit 1F4, June 29, 2012

TEPCO affirms structure of 1F4 will not easily leak, May 30, 2012

TEPCO assures 1F4 will not collapse in further quakes, April 26, 2012

TEPCO - Reactor Buildings will not collapse even in major quake, April 5, 2012

TEPCO - Fourth Soundness Inspection of Unit 4, February 13, 2013

Compilations - These include data and multiple supporting / background links.

Spent Fuel at Fukushima Daiichi Safer Than Asserted - ANS Nuclear Cafe

Setting the Record Straight on the Spent Fuel Pool at Fukushima Daiichi Unit 4 - NEI Nuclear Notes

Spent Fuel Removal / Enclosure

Installation of first beams for enclosure structure, Unit 4 - January 8, 2013

Spent Fuel removal enclosure design, Unit 4 - January 7, 2013

Spent Fuel Removal Process (underway November 2013)

November 12, 2013:  Cover construction completed and certified

November 18, 2013:  Fuel removal from 1F4 SFP begins

TEPCO Questions on Process, Buildings

Fuel Removal Operations Handout

Video - Extraction of Fuel from 1F4 SFP


CNSC Fukushima Daiichi site visit report by Ramzi Jammal (thanks to Jaro Franta) NEW FEB '13  This report includes, first, a great deal of information about Fukushima prefecture decontamination and then many details of a Fukushima Daiichi site visit.  Especially interesting are facts about Unit 4 reactor building's safety and the spent fuel pool contained therein.

New TEPCO report / January 2013:  Demolition and Removal of Structures Damaged or Contaminated as a Result of the Fukushima Accident.   Detailed plant status information, best late information on location of damaged core material, plant demolition plans and timeline.

NEW OCTOBER 21 2013:   The JAEA (Japan Atomic Energy Agency) has a large compilation of reports and presentations which can be found at this link:  Reference Information, Fukushima Daiichi

^^ Above link has had information added to it January 2014.  This link appears continuously updated by the JAEA so keep looking at it for new information.


January 2014:  JAIF has a handout on the contaminated water issues at Fukushima Daiichi.

January 2014:  Nuclear Regulation Authority -- changes to regulatory framework and system as a result of the Fukushima Daiichi accident.  Click here to read it. 

January 2014:  Nuclear Regulation Authority -- Post-Fukushima Assessment and Actions.

February 2014:  IAEA "Events and Highlights on the progress related to recovery operations at Fukushima Daiichi NPS."

February 2014:  Organization for Economic Co-operation and Development (OECD) / Nuclear Energy Agency (NEA) - Committee on Nuclear Regulatory Activities.  Accident Management Insights after the Fukushima Daiichi NPP Accident - Report of the CNRA Task Group on Accident Management.  13 FEB 2014.

OECD / Nuclear Energy Agency Oct 2013:  The Fukushima Daiichi Nuclear Power Plant Accident - OECD/NEA Nuclear Safety Response and Lessons Learned

(Also, related to above OECD / NEA links, see "Report on Fukushima Daiichi NPP Precursor Events" which relates earlier events in other nuclear plants that in one or more ways were predictive of events which occurred at Fukushima Daiichi.

NEW JUNE 2014:  Japan Ministry of Economy, Trade and Industry - Reports on Mid and Long Term Decommissioning of Fukushima Daiichi; Click Here.

From above METI page, most recent condensed report on decommissioning found here.

NEW SEPTEMBER 2014:  TEPCO Unanswered Questions Report -- Covers many topics that were indeterminate or could not be investigated prior.  Many documents included.

Unanswered Questions Progress Report No. 2.   And a backup link of same report.

TEPCO page with links to individual sections of Progress Report No. 2.

OCTOBER 2014 -- Japan's electric industry has launched a new nuclear safety initiative.  The Nuclear Risk Research Center has opened its website and presented the first of what will probably be many documents.  Click here to see the website of the NRRC.

I didn't link it at the time, but here's the latest (August 2014) status report on the Mid and Long Term Roadmap:  August 2014 Roadmap Update from TEPCO

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January 2015

IAEA Mission to Onagawa Power Station:  Onagawa survived the Great East Japan Earthquake and Tsunami, and IAEA sent a mission there to examine the station.  Click here to see the report.

OECD / NEA has launched a Benchmark Study of the Accident at Fukushima Daiichi - calling it the BSAF.  Click here to see the landing page for this new and significant effort.

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March 2015  - Many hours of reading material contained in the FIRST two links below.

IAEA Events and Highlights Related to Recovery of Fukushima Daiichi NPS

METI Mid and Long Term Roadmap for Fukushima Daiichi Recovery - many new updates and links on this Ministry of Economy and Trade page.

Zeolite bags for filtration of water on Unit 2 R/B roof

Continually updated "Handouts for Press Conferences" link here

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Japan Atomic Energy Agency:  "Reference Information about the Fukushima Daiichi Nuclear Accident."  Multiple links to archived information, reports.   Click here to access.

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TEPCO Press Release, imaging at Unit 1, March 19, 2015

Nagoya University imaging at Unit 2, March 20, 2015 (Japanese only)

Toshiba / IRID Press Release March 27, 2015

New large scale reports and analyses are added to this page as they are released and announced.