The Nuclear Regulatory Commission has proposed a fine of $110 000 against Commonwealth Edison. The company is accused of discriminating against an employee who raised safety concerns at the Zion plant in 1997.

An NRC investigation found that a manager deferred a reactor operator’s participation in a training programme and lowered a performance appraisal. The actions happened after the reactor operator had recommended removing a pump following an oil leak. He also questioned the performance of a component in the emergency diesel generator system.

NRC administrator James Dyer directed ComEd to address whether employees are working in a “safety conscious” environment in which they feel free to report concerns.