Arkansas Nuclear One

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Arkansas Nuclear One
RusselvillePowerplant.jpg
Arkansas Nuclear One, February 2010.
Arkansas Nuclear One is located in Arkansas
Arkansas Nuclear One
Location of Arkansas Nuclear One
CountryUnited States
LocationClark Township, Pope County, near Russellville, Arkansas
Coordinates35°18′37″N 93°13′53″W / 35.31028°N 93.23139°W / 35.31028; -93.23139Coordinates: 35°18′37″N 93°13′53″W / 35.31028°N 93.23139°W / 35.31028; -93.23139
StatusOperational
Construction began1969
Commission dateUnit 1: May 21, 1974
Unit 2: Sept. 1, 1978
Construction cost$901,500,000
Operator(s)Entergy
Nuclear power station
Reactor typePressurized water reactor
Reactor supplierUnit 1: Babcock and Wilcox
Unit 2: Combustion Eng.
Power generation
Units operational1824 MW
Nameplate capacityUnit 1: 846 MW
Unit 2: 930 MW
Annual generation15,978 GWh
Website
entergy-nuclear.com/plant_information/ano
 
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Arkansas Nuclear One
RusselvillePowerplant.jpg
Arkansas Nuclear One, February 2010.
Arkansas Nuclear One is located in Arkansas
Arkansas Nuclear One
Location of Arkansas Nuclear One
CountryUnited States
LocationClark Township, Pope County, near Russellville, Arkansas
Coordinates35°18′37″N 93°13′53″W / 35.31028°N 93.23139°W / 35.31028; -93.23139Coordinates: 35°18′37″N 93°13′53″W / 35.31028°N 93.23139°W / 35.31028; -93.23139
StatusOperational
Construction began1969
Commission dateUnit 1: May 21, 1974
Unit 2: Sept. 1, 1978
Construction cost$901,500,000
Operator(s)Entergy
Nuclear power station
Reactor typePressurized water reactor
Reactor supplierUnit 1: Babcock and Wilcox
Unit 2: Combustion Eng.
Power generation
Units operational1824 MW
Nameplate capacityUnit 1: 846 MW
Unit 2: 930 MW
Annual generation15,978 GWh
Website
entergy-nuclear.com/plant_information/ano

Arkansas Nuclear One (ANO) is a two-unit pressurized water reactor nuclear power plant located on Lake Dardanelle just outside Russellville, Arkansas. It is the only nuclear power plant in Arkansas.

It is owned by Entergy Arkansas and operated by Entergy Nuclear.

Units[edit]

Unit One[edit]

Unit One has a generating capacity of 846 MW of electricity, and came online on May 21, 1974. It is licensed to operate through May 20, 2034.[1] Its nuclear reactor was supplied by Babcock and Wilcox.

Unit Two[edit]

Unit Two has a generating capacity of 930 MW of electricity, and came online on September 1, 1978. It is licensed to operate through July 18, 2038.[2] Its nuclear reactor was supplied by Combustion Engineering. Unit two is the only one that uses a cooling tower; Unit One releases heat into Lake Dardanelle.

Surrounding population[edit]

The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of 10 miles (16 km), concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about 50 miles (80 km), concerned primarily with ingestion of food and liquid contaminated by radioactivity.[3]

The 2010 U.S. population within 10 miles (16 km) of Arkansas Nuclear was 44,139, an increase of 17.2 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within 50 miles (80 km) was 308,219, an increase of 13.3 percent since 2000. Cities within 50 miles include Russellville (6 miles to city center).[4]

Seismic risk[edit]

The Nuclear Regulatory Commission's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Arkansas Nuclear was 1 in 243,902, according to an NRC study published in August 2010.[5][6]

March 2013 Incident[edit]

Arkansas Nuclear One cooling tower.jpg

On March 31, 2013, an industrial accident at the facility killed one person and injured eight other workers, including four seriously. [7][8] The accident took place "in a non-radiation area, and there was no risk to public health and safety." According to Entergy, the old stator of unit one's generator fell during an operation to replace it. The falling component ruptured a water pipe causing water infiltration into the plant's switchgear which knocked out power to all of unit one and one train of unit two's electrical system which was online at the time. The electrical failure caused an automatic shutdown of unit two. The plant's emergency generators started and restored power to the emergency systems of both units. Unit one was in a refueling outage.[9] Emergency diesel generators, water pumps and feed water were functioning following a loss of all off site power on Unit 1 according to the NRC Event Notification.[10] The plant was placed under an "unusual event classification", which is the lowest of four emergency classification levels for abnormal events designated by the federal Nuclear Regulatory Commission, which regulates American civil nuclear installations. The plant is located about 60 miles northwest of Little Rock. The injured were taken to a hospital, and the company released an official statement of condolence.[11] Entergy announced that they will immediately commence with repairs to unit two and hope to have the unit back online within several weeks. Entergy also acknowledged that unit one will be offline for an extended time while they survey the damage and establish a time-line for repairs.[12]

The cost of the repairs was estimated at 95-120M$, not counting additional costs to replace lost electricity from the reactors being down for four months. Some of the costs may be recoverable through legal action and insurance claims. Both units were repaired, and started up on August 7th, 2013 capable of returning to full power.[13]

December 2013 Incident[edit]

On December 9, Unit 2 was taken offline due to a transformer fire in the site switchyard.[14]

The fire was contained without injuries or threats to safety.[15]

References[edit]

External links[edit]