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US Nuclear regulator starts special inspection at Quad City nuclear power plant

U.S. Nuclear Regulatory Commission has begun a special inspection of the Quad Cities Generating station in Marseilles (Illinois) after discovering inoperative safety-related vacuum breaks, the agency announced on Monday.

Constellation Energy operates the two-unit nuclear power plant.

According to a press release from the NRC, operators discovered that vacuum breakers designed to maintain structural integrity of containment systems during major events had become inoperative because certain valves hadn't been reopened following testing during a recent fueling outage.

The report said that the incident compromised the system's capability to regulate the containment pressure. This warranted a special inquiry, and the system had been restored.

Jack Giessner, Administrator of Region III, said that while this incident did not impact the safe operation of the plant it was warranted for the regulator to conduct an independent review. This is because there were questions about the performance of employees at the plant which compromised the safety system's ability to perform its function.

The NRC's inspectors said they will evaluate Constellation’s response. They will also assess the company’s understanding of the incident, its scope of assessment actions, as well as the adequacy and design of their procedures and systems.

The findings of the inspection will be published in a report that will be available to the public. It will be posted electronically on the NRC website. (Reporting by Anjana Anil in Bengaluru; Editing by David Gregorio)

(source: Reuters)