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7/31/2019 Summary of the Events at the Fukushima Daiichi Nuclear PlantAnd Dominions ResponseFebruary February 2012
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Summary of the Events at the
u us ma a c uc ear an
And Dominions Response
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Nuclear Energy in Japan
54 operating nuclearreactors (49 gigawatts)
Nuclear provided ~30% ofall electricity in Japan
energy capacity shut downas a result of the
Currently have 11 reactorsoperating
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Fukushima Daiichi Nuclear Station
Unit 1: 439 MWe BWR, 1971 Unit 2: 760 MWe BWR, 1974
n : e ,
Unit 4: 760 MWe BWR, 1978
Unit 5: 760 MWe BWR, 1978
Unit 6: 1067 MWe BWR, 1979
Units 1,2,3 were in operation
prior to the event
Units 4,5,6 were shutdown formaintenance, inspection, and
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re ue ng
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Fukushima Daiichi Unit 1
Sim lified Schematic of T ical BWR Desi n
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*Similar to Millstone Unit 1 design
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Fukushima Daiichi Unit 1
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Earthquake
,
(JST), Japan was struck by amagnitude 9.0 earthquake.
the plant was designed for.
Despite the incredible force, the
systems operated as plannedimmediately after the earthquake.
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Post Earthquake Status
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6
Offsite Power NO NO NO NO NO NO
-Generators
Systems
Control Room YES YES YES YES YES YES
Instrumentation
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Tsunami
The uake created a tsunami reater than 13 meters
(~43 feet) above sea level. The plant was designed to withstand a 5.7 meter
Backup generators, batteries and safety systems
were damaged or destroyed by the resulting flood.
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Post Tsunami Status
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6
Offsite Power NO NO NO NO NO NO
-Generators
eac or oo ng
Systems
Battery Power
for
NO NO YES NO NO YES
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Current Plant Status
U4: defueled
, an : ex en o uedamage unknown, but
Spent fuel pools on all units have stable
cooling installed Tests show NO DAMAGE to fuel in SFPs from
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earthquake or tsunami
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Dominions Nuclear Fleet
ewaunee ower a on s one ower a on
11North Anna Power Station Surry Power Station
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Natural Disaster Preparation
Beyond Design Basis
Emer enc O eratin
Procedures
OriginalDesign of
the Units
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Dominion Response
safely and continue to play a vital role in our
Dominion verified existing programs designed to
critical plant systems immediately after the eventsin Japan.
Operators and Emergency Response personnelmaintain a high level of readiness to respond to
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events including severe accidents.
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Dominion Response
including abnormal operating procedures,m r n r in r r n v r
accident management guidelines.
D mini n h m h mmi i nMillstone Unit 1 available to the industry forits use in testing or review of the containment
structure
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Natural Disaster Preparation and Response
after Fukushima:
Nuclear Power Operations (INPO)
Initiated new reviews of our equipment, training &proce ures
Verified the capability our nuclear fleet to mitigate:
Events that are considered to be be ond the desi n
basis
Total loss of offsite power
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Natural Disaster Preparation and Response
Multiple, redundant sources of electricalpower and safety equipment
ese generators equ va ent to a ocomot veengine)
Steel gates
Tornado doors
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Industry Response Timeline
IER 11-1 Issued March 15
Portable Response Equipment Verification : March 23 oss o ower qu pmen er ca on: arc Flooding Response Verification: April 6
Fire/Flood Response Verification: April 13 -
Spent Fuel Pool Response Verification: September 23
IER 11-4 Issued August 1
oss o ower na ys s esponse: anuary ,NRC Bulletin 2011-01 Issued May 11, 2011 30 da /60 da Res onse
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NRC 90-day Report Issued July 12, 2011
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Fukushima Steering Committee Established
industry to Fukushima in seven focusr
Made up of EPRI, NEI, INPO and the
in r
Dominion CNO David Heacock is on thecommittee also chair of NEI FukushimaRegulatory Response Working Group
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Long-term Impacts
Release of Radioactive Material 10-15% of Chernob l releases ~4 million Ci
Permanent evacuation zone
Economic Impact Extended Shutdown of Nuclear Fleet
US Nuclear Industry
More on-site equipment, staffing
Stricter design basis criteria for existing plants and wider
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app ca y o a cr er a
All 90-day report recommendations
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Millstone Station and Dominion remain
committed to public safety. We will continueo prov e any necessary suppor orrecovery efforts in Japan including use of/or
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