Fukushima 10 years later: It still could happen here
Initially, the U.S. Nuclear Regulatory Commission had declined to take a closer look at the risks of a core meltdown at Duane Arnold atomic reactor in Iowa, severely damaged by a derecho in August 2020. (Duane Arnold never recovered, but instead announced permanent shutdown.) But an NRC staffer dissented, forcing the agency to take that harder look.
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Lyman has tweeted the following:
The @NRCgov has released the final risk analysis of the derecho that struck the Duane Arnold #nuclear plant in #Iowa in August 2020 and caused a loss of offsite power. The mean risk of core damage was 1/1250, but without FLEX credit was nearly 1 percent. https://nrc.gov/docs/ML2105/ML
As Arnie Gundersen, chief engineer at Fairewinds Energy Education, has put it, "This was a close call."