summary of the events at the fukushima daiichi nuclear plantand dominion’s responsefebruary...

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

4

*Similar to Millstone Unit 1 design


5/21

Fukushima Daiichi Unit 1

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6/21

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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7/21

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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8/21

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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9/21

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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10/21

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


11/21

Dominions Nuclear Fleet

ewaunee ower a on s one ower a on

11North Anna Power Station Surry Power Station


12/21

Natural Disaster Preparation

Beyond Design Basis

Emer enc O eratin

Procedures

OriginalDesign of

the Units

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13/21

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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15/21

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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16/21

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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17/21

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


18/21

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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summary of the events at the fukushima daiichi nuclear plantand dominion’s responsefebruary...

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