Total U.S. nuclear plant availability edged lower early Dec. 12 to 93.69%, down from 94.29% on Dec. 9 and above the 91.55% reported on the same day in 2015.

Working to tug total U.S. output lower was the loss of Exelon Corp.'s Nine Mile Point 1 nuclear unit in New York. According to a filing with the U.S. Nuclear Regulatory Commission, the reactor was manually scrammed Dec. 10 due to high vibrations on the main turbine.

For details of U.S. nuclear power plant operations, visit our Nuclear Availability and Status and Outage Pages.