Entergy's Vermont Yankee nuclear plant reports "unusual event" to NRC

By Dorothy Davis

Entergy's Vermont Yankee nuclear power plant in Vernon, Vermont declared an unusual event Sunday just after 7 p.m. EST due to a loss of 75 percent of certain control room alarms for more than 15 minutes, according to an event report filed with the U.S. Nuclear Regulatory Commission (NRC).

State authorities and the NRC resident inspector were notified per procedure. The event status was lifted at 8:28 p.m. EST, after the issue was traced to a blown fuse which was replaced, restoring power to the control room annunciators without further incident.

An unusual event is the lowest of four emergency classifications utilized by the NRC, and entails that there has been no release of radioactive material requiring offsite response or monitoring.

The Vermont Yankee is currently operating at full capacity.

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