LOS ANGELES (Reuters) - Southern California Edison said an emergency generator at one of its San Onofre nuclear reactors may have been tampered with, prompting the utility to beef up security at the plant, which has been out of service since January due to a leak in a steam generator.
In a statement on Thursday, the Edison International unit said it discovered engine coolant in an oil system in the backup diesel generator in late October during routine monitoring. An internal probe found evidence of potential tampering, though it could not be confirmed.
The presence of coolant posed no safety risk, the company said.