Diablo Canyon 2 nuclear plant in California is running at reduced power after two backup diesel generators became inoperable at the same time.
Workers with Pacific Gas & Electric (PG&E, NYSE: PCG) were performing scheduled maintenance on the Unit 2 emergency diesel generator and discovered a failed capscrew on an engine cylinder. Subsequent inspections showed a degraded capscrew on another emergency diesel generator for Unit 2, which was declared inoperable. None of the Unit 1 generators, nor a third backup generator for Unit 2, showed any issues.
Since two diesel generators were inoperable at the same time, per U.S. Nuclear Regulatory Commission requirements, the plant had to shutdown. Unit 2 is currently running at 40 percent.
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