Rajan Wilcox
Limerick Generating Station, a nuclear power plant in Pennsylvania, has been at the centre of a debate about the storage of spent nuclear fuel. The plant's operator, Exelon, has requested an exemption from Nuclear Regulatory Commission (NRC) requirements to allow the loading and storage of spent fuel in a non-compliant storage system. This has raised concerns about the potential environmental impact and safety hazards associated with spent fuel storage. The NRC has also proposed a rule that would allow security guards at nuclear power plants to use machine guns and enhanced weapons to protect spent fuel rods, citing the need to guard against radiological sabotage. The cost of implementing this rule at Limerick and other nuclear plants is estimated to be between $26.5 million and $34.7 million.
| Characteristics | Values |
|---|---|
| Location | Limerick Generating Station, Limerick, PA |
| Owner | Constellation Energy Generation, LLC (Constellation) |
| Units | 1 and 2 |
| Type of fuel | Nuclear |
| Storage system | HI-STORM Flood/Wind (FW) MPC Storage System |
| Storage condition | Non-compliance with NRC requirements |
| Storage type | Dry casks and spent fuel pools |
| Security | Machine guns, drones, vessels, and nets |
| License expiration | Unit 1: Oct. 26, 2024; Unit 2: June 22, 2029 |
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What You'll Learn
Limerick Generating Station's spent fuel storage
The Limerick Generating Station (LGS) is a nuclear power plant located in Limerick Township, Montgomery County, Pennsylvania, along the Schuylkill River. The plant was initially developed by the Pennsylvania Electric Company, now a subsidiary of Exelon called PECO. Exelon Nuclear owns and operates the plant through its subsidiary Exelon Generation. The plant has a capacity of 2.32GW and powers two million homes with carbon-free electricity generated by two operating units of approximately 1.15GW each.
Unit 1 of the LGS began operating in 1986, while Unit 2 began operating in 1990. The units are licensed to operate until 2044 and 2049, respectively, following extensions granted by the Nuclear Regulatory Commission (NRC) in 2014. The plant uses General Electric's Boiling Water Reactor (BWR) technology, housed within a GE Mark II wet containment system, to generate electricity. The reactor requires refuelling every two years, during which the plant goes for a power outage.
The LGS has independent spent fuel storage installations for spent nuclear fuel. Constellation Energy Generation, LLC, which separated from Exelon Corporation in 2022, submitted a request to the NRC for an exemption to maintain three loaded and load five new 89 multi-purpose canisters (MPC) with continuous basket shims (CBS) in the HI-STORM Flood/Wind (FW) MPC Storage System at its LGS Units 1 and 2 Independent Spent Fuel Storage Installation (ISFSI). The NRC issued an environmental assessment and a finding of no significant impact (FONSI) for this exemption request in May 2024.
The LGS's spent fuel storage system is an important aspect of the plant's operations, ensuring the safe and secure storage of spent nuclear fuel. The HI-STORM FW MPC Storage System is an NRC-approved design for dry cask storage, which is a critical component of the plant's overall spent fuel management strategy.
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Environmental impact of storing spent fuel
Spent nuclear fuel is nuclear fuel that has been used in a reactor and is no longer useful in sustaining a nuclear reaction. It is occasionally referred to as nuclear waste, although some in the industry consider it a valuable resource. The fuel used in today's commercial reactors is made up of small ceramic pellets of low-enriched uranium oxide.
The environmental impact of storing spent nuclear fuel depends on the type of storage used. In the United States, spent nuclear fuel is typically stored in spent fuel pools (SFPs) or dry casks, either on nuclear power plant sites or in Independent Spent Fuel Storage Installations (ISFSIs). ISFSIs can be located adjacent to a nuclear power plant or away from the reactor. The majority of ISFSIs store spent fuel in dry casks, which are designed to withstand more than 99% of vehicle accidents, including water immersion, impact, punctures, and fires.
Spent fuel stored in SFPs is typically kept there for a year or more to cool and provide shielding from its radioactivity. However, if there is a prolonged interruption of active cooling, the water in the SFPs may boil off, potentially resulting in the release of radioactive elements into the atmosphere. There are concerns about the vulnerability of SFPs to incidents such as earthquakes or terrorist attacks, which could lead to a release of radiation. The Nuclear Regulatory Commission (NRC) has implemented rules mandating that all fuel pools be impervious to natural disasters and terrorist attacks, with the NRC describing them as "strong structures" that are "highly resistant to damage".
The Limerick Generating Station (LGS) in the United States has applied for an exemption to store spent nuclear fuel in a non-compliant storage system. The U.S. NRC has issued an environmental assessment and found no significant impact, allowing LGS to maintain and load new canisters in a non-compliant storage system.
Overall, the environmental impact of storing spent nuclear fuel depends on the specific circumstances and storage methods used. While there are risks associated with storing spent fuel, particularly in SFPs, regulations and safety measures are in place to mitigate these risks. In the long term, appropriate disposal arrangements are required for high-level radioactive waste to ensure the safe and environmentally sound disposal of this waste.
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Unloading casks and radiation exposure
Unloading casks at Limerick Generating Station (LGS) Units 1 and 2 would subject station personnel to additional radiation exposure. The process would also generate additional contaminated waste, increase the risk of a possible fuel handling accident, and increase the risk of a possible heavy load handling accident.
The removed spent fuel would need to be placed in the spent fuel pool, where it would remain until it could be loaded into an approved storage cask. A delay in loading this spent fuel into other casks could affect the plant's ability to effectively manage the spent fuel pool capacity and reactor fuel offloading.
The Limerick plant has two nuclear reactors with operating licenses expiring on October 26, 2024, for Unit 1, and June 22, 2029, for Unit 2. Exelon has requested a 20-year extension on both licenses. According to a report by the Union of Concerned Scientists, spent fuel stored in dry casks is significantly safer than rods kept in pools. Each dry cask only holds 10 to 15 tons of spent fuel, or a few percent of a typical spent fuel pool, reducing the risk of a large-scale radiological release.
The Nuclear Regulatory Commission (NRC) has proposed a rule that would allow security guards to use machine guns and "enhanced weapons" to protect spent fuel rods at nuclear power plants. This proposal aims to safeguard against "radiological sabotage" at nuclear power plant sites with on-site fuel storage areas. The cost of implementing this proposal is estimated to be between $26.5 million and $34.7 million.
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Limerick's security officers and weaponry
Limerick Township's security is ensured by the Limerick Township Police Department, founded in May 1965 with the approval of a police administrator and six part-time patrol officers. The department has since grown to include 30 officers, four civilians, three crossing guards, and two canine units. The officers are part of the Regional DUI Enforcement Team, the Montgomery County Drug Task Force, and the Montgomery County Major Incident Response Team. The department also has a SWAT team, MSWAT-W, which is a highly trained and equipped group of officers that can provide tactical resolution to high-risk incidents. The police are in constant communication with the FBI, the Pennsylvania State Police, and the Montgomery County Office of Emergency Preparedness. They also actively participate in drills at the Limerick Nuclear Generating Station and work daily with LGS security to ensure a safe and secure facility.
The Limerick Nuclear Generating Station is run by Constellation Energy Generation, LLC, which has requested an exemption from the U.S. Nuclear Regulatory Commission (NRC) to manage spent fuel more efficiently. The request is due to Constellation currently being out of compliance with NRC requirements, resulting from the previous loading of spent fuel into a storage system with the CBS variant basket design. The exemption would allow Constellation to manage the spent fuel pool margin and capacity to enable refueling and offloading fuel from the reactor more efficiently. It would also help them manage the availability of the specialized workforce and equipment needed to support competing fuel loading and operational activities at the LGS and other Constellation sites.
The Limerick Township Police Department is committed to serving the public with the highest level of professionalism and strives for new and more efficient ways to enhance its service capabilities. They work to improve the quality of life for residents, business people, and visitors to Limerick Township and maintain the public trust by partnering with the community and conducting themselves with integrity. The department also provides various services to the community, including crime prevention programs, safety presentations, and fingerprinting services.
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Exelon's license renewal for nuclear reactors
The Limerick Generating Station is a nuclear power plant located in Limerick Township, Pennsylvania, approximately 29 miles (47 km) northwest of Center City, Philadelphia. The plant has two General Electric boiling water reactor (BWR) units, capable of producing 2,317 megawatts of power, providing electricity to around 2 million households.
In 2014, the Nuclear Regulatory Commission (NRC) granted a twenty-year license renewal for both units, extending their operational life to 2044 (Unit 1) and 2049 (Unit 2). The NRC has oversight of license transfers and renewals for nuclear power plants, and in this case, approved the transfer of licenses for 23 operating reactors from Exelon Corporation to a new company, as part of a corporate restructuring. Exelon had applied for a license extension for the Limerick plant in 2011.
Exelon has also sought license renewals for other nuclear power plants. The Nuclear Regulatory Commission approved a 20-year extension for Exelon's Peach Bottom plant in Pennsylvania, allowing the two-unit reactor to operate until 2054. This made Peach Bottom the second nuclear power reactor in the U.S. to get permission to operate for 80 years. The Clinton Power Station's initial license renewal application was submitted by Constellation Energy, formerly a subsidiary of Exelon, and the Dresden nuclear power plant in Illinois is also seeking a license renewal.
The Limerick Generating Station requires refueling every two years, and inspection and maintenance work is performed during this outage period. The plant has independent spent fuel storage installations, with 1,508 metric tons of spent nuclear fuel on-site.
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Frequently asked questions
The Limerick Generating Station (LGS) is a nuclear power plant owned by Constellation Energy Generation, LLC, and operated by Exelon.
Spent fuel, also known as used nuclear fuel, is the nuclear fuel that has been used in a nuclear reactor and can no longer efficiently produce heat.
Spent fuel at the Limerick Generating Station is stored in dry casks and pools.
Storing spent fuel in pools poses a higher risk than dry casks due to the larger amount of fuel in a single pool. Unloading casks can also increase the risk of radiation exposure and fuel handling accidents.
The exact amount of spent fuel stored at Limerick per year is unclear, but the total amount of commercial spent fuel in the United States increases by 2,000 to 2,400 metric tons annually.
