Exelon Generation's 890-MW Calvert Cliffs-1 nuclear reactor in Lusby, Maryland, is reducing output in preparation for a refueling and maintenance outage, a company spokeswoman said Monday.
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The unit was operating at 98% of capacity early morning that day, the US Nuclear Regulatory Commission said in its daily reactor status report. The unit operated at 99% on Sunday, and 100% Friday, according to NRC.
US nuclear power units typically reduce their output gradually before shutting for refueling. This so-called coastdown period varies in duration from several days to several weeks.
Another Exelon spokeswoman, said Monday that she cannot discuss the planned duration of the outage, or estimate when the unit will synchronize with the electricity grid, citing "competitive reasons."
The average duration of refueling outages at US nuclear units in the first half of 2017 was 35.7 days, according to S&P Global Platts data.
The 880-MW Calvert Cliffs-2 continues to operate at 100%, according to NRC's reactor status report.