SACRAMENTO -- Federal regulators have issued proposed safety violation citations to Southern California Edison Co. and its contractor for alleged design flaws in steam generators at the San Onofre nuclear power plant.
The Nuclear Regulatory Commission on Monday released the results of an inspection into the failures that led to Edison's decision in June to shutter two units at the electricity generating station near San Clemente.
In January of 2012, steam tubes in one of the units began to leak and the complex was shut down.
The commission preliminarily determined that inadequate computer modeling done by the contractor, Mitsubishi Heavy Industries, led to a deficient design of the steam generators and created a safety problem of "low to moderate" significance.
The commission is not seeking any financial penalties from either Edison or Mitsubishi.
Edison has 10 days to notify the commission whether it will accept the findings, while Mitsubishi has 30 days to respond in writing. Edison has not determined how it might respond, said spokeswoman Maureen Brown.