Limerick Generating Station

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Limerick Generating Station
NRC image of Limerick Generating Station, Units 1 & 2.
Limerick Generating Station is located in Pennsylvania
Limerick Generating Station
Location of Limerick Generating Station
Limerick Generating Station is located in the US
Limerick Generating Station
Location of Limerick Generating Station
Country United States
Location Limerick Township, Pennsylvania
Coordinates 40°13′36″N 75°35′14″W / 40.22667°N 75.58722°W / 40.22667; -75.58722Coordinates: 40°13′36″N 75°35′14″W / 40.22667°N 75.58722°W / 40.22667; -75.58722
Status Operational
Construction began 1974
Commission date Unit 1: February 1, 1986
Unit 2: January 8, 1990
Construction cost $7.246 billion (2007 USD, Unit 1 only)[1]
Operator(s) Exelon
Nuclear power station
Reactor type BWR
Reactor supplier General Electric
Cooling source Schuylkill River
Cooling towers 2 × Natural Draft
Power generation
Units operational 1 × 1130 MW
1 × 1134 MW
Make and model GE BWR-4 (Mark 2)
Thermal capacity 2 × 3515 MWth
Nameplate capacity 2264 MW
Capacity factor 98.02%
Annual net output 19,440 GW·h (2016)
Limerick Generating Station

The Limerick Generating Station in Pennsylvania is located next to the Schuylkill River in Limerick Township, Montgomery County, northwest of Philadelphia. The facility has two General Electric boiling water reactor (BWR) units, cooled by natural draft cooling towers. The two units are capable of producing over 1,200 megawatts of power each, which combined would provide electricity to over 2 million households. Exelon Corporation owns and operates this facility. With the exception of refueling outages, Limerick Generating Station always operates at 100% power. The plant is connected to the grid by several 500kv transmission lines.

For critical standby power, Exelon depends on eight Fairbanks Morse Opposed Piston 38D 8 1/8 Emergency Diesel Generator sets that each deliver 3000 kilowatts of power and are capable of achieving rated speed within ten seconds of start.

The cooling towers for the Limerick Generating Station can be seen for miles away in parts of Montgomery, Chester, and Berks counties. On clear days the cooling towers for the Limerick Generating Station can be seen from the One Liberty Observation Deck in Philadelphia.

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.[2]

The 2010 U.S. population within 10 miles (16 km) of Limerick was 252,197, an increase of 18.7 percent in a decade, according to an analysis of U.S. Census data for The 2010 U.S. population within 50 miles (80 km) was 8,027,924, an increase of 6.1 percent since 2000. Cities within 50 miles include Philadelphia (28 miles to city center).[3]


The site was chosen and plans to build the station were announced in 1969, by the Philadelphia Electric Company (now PECO Energy, a subsidiary of Exelon). It is located approximately one mile south of Sanatoga, PA. Community protests by the Keystone Alliance and other delays pushed the start of construction by the Bechtel Power Corporation to June 1974.

Limerick Unit 1 first attained criticality (began producing nuclear power, at limited capacity) on December 22, 1984 and was certified for commercial operation on February 1, 1986.

Limerick Unit 2 attained criticality on August 1, 1989, and commercial operation began on January 8, 1990.[4]

President George W. Bush visited the Limerick Generating Station in May 2006 to discuss nuclear power and its role in the Advanced Energy Initiative, which he announced at the 2006 State of the Union Address. He toured the facility, including a trip to the control room of the plant.[5]

On October 20, 2014, the Nuclear Regulatory Commission (NRC) granted extensions for Limerick Units 1 and 2 for another 20 years. The units now are licensed to operate until 2044 and 2049 respectively.[6]

Unit 2 of the station was scrammed from 100% power to a shutdown on June 1, 2016, at 9 am. The reactor was shut down due to an electrical fault, causing the stopping of the recirculation pumps. The steam bypass valves that lead to the main condenser were opened and Limerick went through a normal hot shutdown process.[7]

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 Limerick was 1 in 18,868, according to an NRC study published in August 2010.[8][9] Following the Fukushima Daiichi nuclear disaster in 2011, government regulators announced the plant would undergo further evaluations for seismic activity risk.[10]

A quarry is located nearby which occasionally does blasting; however, this is done with the consent of plant staff.

See also[edit]


  1. ^ "EIA - State Nuclear Profiles". Retrieved 3 October 2017. 
  2. ^ "Archived copy". Archived from the original on 2006-10-02. Retrieved 2012-03-14. 
  3. ^ Bill Dedman, Nuclear neighbors: Population rises near US reactors,, April 14, 2011 Accessed May 1, 2011.
  4. ^ "Locations - Energy plants and facilities - Exelon". Retrieved May 8, 2017. 
  5. ^ "President Discusses Energy During Visit to Nuclear Generating Station in Pennsylvania (Text Only)". Retrieved May 8, 2017. 
  6. ^ NRC Renews Operating Licenses of Limerick Nuclear Plant for an Additional 20 Years. U. S. Nuclear Regulatory Commission, October 20, 2014. Retrieved October 28, 2014.
  7. ^ "NRC: Event Notification: MANUAL REACTOR SCRAM DUE TO UNEXPECTED CORE FLOW CHANGE". NRC: Event Notification Report for June 2, 2016. Retrieved February 18, 2017. 
  8. ^ Bill Dedman, "What are the odds? US nuke plants ranked by quake risk,", March 17, 2011 Accessed April 19, 2011.
  9. ^
  10. ^ "American Nuclear Power Under Scrutiny After Disaster In Japan", CBS Philadelphia. March 14, 2011. Accessed June 14, 2011

External links[edit]