Crack at Crystal River Nuclear Power Plant explained

From the St. Petersburg Times:

From the start, one question especially has concerned the federal Nuclear Regulatory Commission: Why Crystal River?

Why did a 42-inch-thick wall at that nuclear plant separate into two layers during a big maintenance project last fall? Other nuclear plants have done similar jobs 26 times around the country, but no one ever saw a crack like Crystal River's — a crack that has kept the plant off-line for 11 months and piled up nearly a quarter of a billion dollars in outage costs.

On Thursday, NRC officials said they think they know the answers to that question and others.

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