Ameren Corp (AEE)

[Timothy Smith]

The Nuclear Regulatory Commission says it has begun a special inspection at Ameren's (NYSE:AEE) 1,190 MW Callaway nuclear plant in Missouri to review the failure of control valves following a reactor shutdown on Aug. 11.

The NRC says inspectors will be at the plant operated by Ameren (AEE) for about a week to review the failure of three of four control valves that regulate water flow to the steam generators.

The NRC has said it was told of a similar problem in December 2014, and a third unrelated control valve problem earlier this year.