- Associated Press - Friday, April 6, 2012

LOS ANGELES (AP) - The chief of the Nuclear Regulatory Commission will get a firsthand look at the troubled San Onofre nuclear plant in California, where the twin reactors have been sidelined for more than two months.

The tour Friday by NRC Chairman Gregory Jaczko comes 10 days after the agency announced San Onofre will remain dark until Southern California Edison fixes a widespread problem with tubing that carries radioactive water.

More than 300 alloy tubes at the plant located between San Diego and Los Angeles were so damaged they will be taken out of service.

The company says vibration and friction inside massive steam generators is causing the unusual wear, but investigators don’t know why that’s happening.

Democratic Sen. Dianne Feinstein and Republican Rep. Darrell Issa are scheduled to join the walk-through.