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Calvert Cliffs Nuclear Power Plant Unit 1 will continue to operate below full power throughout the weekend after a leak was discovered in the reactor coolant system after 11 p.m. Thursday night.

The reactor coolant system, which circulates water as a coolant, had a leak in one of the lines about 11:15 p.m., said Neil Sheehan, spokesman for the U.S. Nuclear Regulatory Commission.

The plant’s operating license specifies if a leak is not remedied within 36 hours of discovery, the unit must be shut down. Unit 1 was reduced to 10 percent Thursday night so workers could safely fix the leak, according to a statement from Sheehan.

Workers found a small leak in the system, said Kory Raftery, Calvert Cliffs spokesman.

Once workers isolated the leaking line, the reactor’s power started to rise again. Early on Friday morning, the plant was operating at 12 percent, Sheehan said.

After tests are completed on Unit 1, Raftery said, the unit will be brought to 82 percent and then scheduled summer maintenance will be conducted on the unit throughout the weekend before it is brought back up to full power.

There were no supply effects on the grid because of the unit’s decrease in power, Raftery said Friday. Additionally, no immediate safety concerns were identified.

sfleischman@somdnews.com