There is a misconception that nuclear (and coal) plants have inherently superior reliability than other generation sources. Coal plants and their transportation links can fail in bad weather, including very cold weather. A nuclear plant must go offline if it loses redundant access to grid power, which is what happened in this case. There is no obvious reason to believe that a coal or nuclear plant is any more reliable than, for example, a natural gas plant with firm transportation and/or fuel oil backup.
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