NRC to examine concrete degradation at Seabrook

17 September 2012

The Nuclear Regulatory Commission will conduct additional inspections and reviews to independently verify and assess work being done to address concrete degradation identified at the Seabrook nuclear power plant in New Hampshire. The 1295 MWe Seabrook pressurized water reactor is operated by NextEra Energy Seabrook, LLC.

NRC said in a statement that while its reactor oversight process does not prescribe increased oversight, “the (agency) staff believes the additional inspections and assessments are needed to support the review of licensee commitments and planned large-scale concrete specimen testing by the licensee, the development of staff technical guidance, and stakeholder communications and outreach activities,” as outlined in a memorandum.

That request for further resources has now been approved via the “Deviation Memorandum,” which refers to a deviation from the reactor oversight process.

The degradation of concrete in some areas of specific structures at the Seabrook plant is being caused by an alkali silica reaction. ASR is a chemical combining of reactive silica from the concrete aggregate with the alkali from the cement paste in the presence of moisture. The result of the reaction is a gel, which can expand and may cause micro-cracks in the concrete.

While the extent of the problem at Seabrook is still being evaluated, the NRC has determined that the structures identified to be affected by ASR can perform their safety function when called upon.

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