The operators of the troubled San Onofre nuclear plant could face an enforcement action by the Nuclear Regulatory Commission over a “cyber security” violation that occurred in 2011, according to a letter sent by regulators on Monday.

The violation was reported by the plant operator, Southern California Edison, and was corrected, along with a second, minor deficiency, also self reported.

The NRC letter says the violation involved a failure to develop a procedure for a “cyber security analysis of electronic devices.” The minor deficiency involved “failure of personnel to follow procedural guidance.”

No further details were provided either by NRC or Edison, both citing security reasons for declining to provide further information.

But the NRC letter also says the violation was under review, and was “being considered for escalated enforcement action.”

A statement from Edison said the company welcomes inspections and monitoring, and is committed to safety.

The NRC letter also mentions another potential violation in 2007 involving the failure of an Edison employee to report an arrest for public intoxication.

But the letter says the NRC “will exercise discretion and not issue a violation.”

Neither the NRC nor Edison provided further details, Edison citing, in part, personnel reasons.

Both of the nuclear plant’s reactors remain sidelined as evaluation continues of problems with its steam generators.

Edison officials said last week that the reactors will likely remain offline through the summer, prompting contingency measures to assure adequate power supplies.

Those included reactivating two natural gas power units that had been shut down at the AES power plant in Huntington Beach.

Edison also has plugged more than 1,300 steam generator tubes, out of nearly 20,000 for each pair of steam generators at the nuclear plant, because of tube wear or as a precaution.

Steam-generator tube-wear was found in both reactor units, with two steam generators for each reactor, after a steam-generator tube leak prompted the shutdown of reactor Unit 3 on Jan. 31.

The leak resulted in a small release of radioactive gas, although Edison said neither plant employees nor the public were placed in danger.

The Unit 2 reactor had been shut down for routine maintenance earlier in January and inspections revealed the steam-generator tube wear in both units — including some showing an unusual type of wear indicating the tubes had been rubbing together.

On Monday evening, an NRC “Augmented Inspection Team” will provide Edison with a summary of its findings on the tube leak, shutdown and possible causes of the tube wear during a public meeting.

The meeting will be held at the San Juan Capistrano Community Center from 6 p.m. to 9 p.m.