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This presentation provides an overview of the nuclear accidents that occurred at the Fukushima I power plant on March 11, 2011.


  • 1. Fukushima Dai-ichiNuclear Power StationAccident
    Joseph S. Miller
    EDA, Inc
    ASME Energy Committee Colloquium
    May 10, 2011
    Brigham Young University

2. Introduction
Over 35 Years in the Nuclear Power Industry
MS Nuclear, BS Mechanical, BS Industrial
Worked at a BWR Nuclear Power Station for 9 years.
Responsible for fuel, safety analyses and PRA.
Responsible for the Nuclear Steam Supply Systems
Technical Support Manager for Emergency Response Organization.
Supported the Nuclear Regulatory Commission (NRC) in reviewing Nuclear Power Plant Safety Systems.
3. Acknowledgement for Use of their Reference Material
Thanks to Japanese Industrial Atomic Forum (JIAF)
Tokyo Electric Power Company (TEPCO)
AREVA PowerPoint- The Fukushima Daiichi Incident Dr. Matthias Braun
Nuclear and Industrial Safety Agency (NISA) & Japan Nuclear Energy Safety Organization (JNES) on Plant Data
Lake H. Barrett-Foundation For Nuclear Studies Briefing
General Electric
VGB Power Tech
4. The Fukushima DaiichiAccident
Plant Designs (Covered by Tom Hafera)
What Happened?
Accident Progression
Spent fuel pools
Radiological releases
Impact on US
5. PWR Pressurized Water Reactor
6. 7. 8. 9. Nuclear Chain Reaction
10. 11. What Happened?
12. 13. 14. 15. 16. 17. The Real Catastrophe was from the Tsunami
26,000 (dead &missing) & 130,000 homeless (April 28, 2011)
Lead four plants at Fukushima I to fuel damage and large releases of radiation
18. 19. Tsunami Size Was Accident Cause 3/11 15:45 at Fukushima I
20. The tsunami hits Fukushima I
21. 22. 23. 24. Plant Designs - Fukushima Dai-Ichi
BWR is a Boiling Water Reactor
Unit 1 is BWR/3
Units 2-4 are BWR/4
There are 56 Reactors in Japan (1-FBR, 4-ABWR, 29-BWR, 23-PWR) compared to 104 Reactors in the USA (35 BWRs & 69 PWRs)
The Fukushima I reactors began operation in the 1970s so they are all thirty - forty years old.
Fukushima I Units 1-4 all are early vintage Mark I Containment Designs
25. What happened?

  • The plant was immediately shut down (scrammed)

when the earthquake first hit. Off-Site power was lost.

  • Emergency Diesel Generators (EDGs) started to provide backup electrical power to the plants backup cooling system. The backup emergency systems worked.

26. All AC power to the station was lost when the tsunami flooded the EDGs, which occurred about 1 hour after the earthquake. 27. At that point, the plant experienced a complete blackout (no AC electric power at all).Commonly called a Station Blackout. 28. Only battery power was left.


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