The US Nuclear Regulatory Commission has issued notices of violation and three civil penalties totalling $903,471 to the Tennessee Valley Authority for failing to follow procedures when it restarted Unit 1 of its Watts Bar nuclear power station following a 2015 maintenance outage.
The NRC's four-year investigation found five violations, including inaccurate control room log information.
The NRC also issued violations to two managers and a plant operator for their roles in the incident.
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