Nuclear Regulatory Commission investigators have uncovered what they believe to be potentially critical errors in the design of earthquake safety equipment at Pacific Gas & Electric Company's troubled Diablo Canyon nuclear power plant. The suspected design errors were discovered Friday during a commission review of the plant's seismic design.
PG&E engineers appear to have underestimated the weight of safety-related equipment supported by reinforced steel braces. The error means the equipment could fall in the event of a major quake.
As a result of the error, the federal agency may more thoroughly investigate equipment at the power plant.