Total U.S. nuclear plant availability edged lower at the start of the new week, easing from 93.97% on Dec. 16 to 93.67% on Dec. 19 and below the 94.42% reported on the same day in 2015.
Helping to pull total output lower was the loss of Energy Northwest's Columbia Generating Station in Washington, which was shut from full power. According to a filing with the U.S. Nuclear Regulatory Commission, on Dec. 18, the unit experienced a full reactor scram due to a load reject from the Bonneville Power Administration Ashe substation.
Additionally, Entergy Corp.'s Pilgrim Nuclear Power Station in Massachusetts was idled as of early Dec. 19. The reactor saw output fall from 100% power Dec. 14 to 25% as of Dec. 15.
Conversely, production at unit 1 of Entergy's Arkansas Nuclear One in Arkansas ramped from 60% on Dec. 16 to 100% as of early Dec. 19. Also, Dominion Resources Inc.'s Surry 1 in Virginia returned to full power as of early Dec. 19. Production had been dropped to 60% around Dec 16.