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What Is An "Unusual Event?"

While keeping my ear to the ground on Twitter today, I came across this message from the editor at West Chester Patch.

For those of you unfamiliar with safety procedures at American nuclear plants, the term "unusual event" is an official definition that the plant is required to use. As the folks at Nuclear Tourist helpfully remind us ...
The Notification of Unusual Event (NOUE) is the lowest NRC emergency action level and requires that the utility notify the Nuclear Regulatory Commission (NRC) and the state emergency agency. The NUE indicates there is a degradation of safety systems, although not serious enough to warrant special activation of the utility emergency organization.
I hope that clears things up.

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