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Calvert Cliffs Nuclear Power Plant began its refueling and maintenance outage on unit 2 last weekend.

At about 10 a.m. Sunday morning, Calvert Cliffs Nuclear Power Plant Unit 2 was shut down for normal refueling and maintenance activities as well as material modifications and improvements, said Kory Raftery, CCNPP spokesman. The material modifications and improvements include plant process computer replacement, turbine generator rewind and first-time preventative maintenance jobs.

Raftery explained that the refueling outages are scheduled for each operating unit — units 1 and 2 — every two years to refuel the reactor and perform maintenance that can only be performed when the unit is shut down.

“Those activities are needed to safely and reliably run the unit through the next 24-month operating cycle,” Raftery said.

About 1,000 supplemental personnel will participate in the refueling and maintenance outage. Raftery said those workers undergo “thorough” background checks and are “highly trained.”

Raftery said the startup is coordinated with PJM, a regional transmission organization that coordinates the movement of wholesale electricity in the Mid-Atlantic region, though the details are “not publicly released by Calvert Cliffs … because we do not want to take any actions or create any expectations that might inadvertently impact the regional electricity market.”

amanda harrison