A California utility said Thursday it has notified the Nuclear Regulatory Commission of potential sabotage, possibly by an employee, of a crucial piece of safety equipment attached to one of its nuclear power reactors.

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San Onofre Nuclear Plant Investigating Possible Sabotage Of Safety System

Huff Post

Southern California Edison said the incident did not pose an immediate safety threat because the plant involved, the San Onofre Nuclear Generating Station near San Clemente, is currently offline. But the plant operator found engine coolant had been poured into an oil reservoir on an emergency backup generator, which would have likely caused the generator to malfunction if needed to help cool the reactor during a power failure. The tampering is being taken seriously and security at the plant has been tightened, SCE said.

“The comprehensive investigation has included rigorous tests, a review of station logs and employee interviews to determine the cause of the presence of the residual engine coolant,” the company said in a statement late Thursday. “Based on the unexpected discovery of the coolant in the diesel oil system and the…