Nuclear Regulatory Commission: Hutchinson Island’s reactors will require earthquake upgrades

Hutchinson Island’s  nuclear reactors (St. Lucie 1 & 2) are on a Nuclear Regulatory Commission list of 27 reactors that will require upgrades to better withstand earthquakes.

The NRC flagged the 27 plants for possible upgrades by calculating the likelihood of a severe accident based on 2008 hazard maps from the U.S. Geological Survey and comparing it to the seismic risk estimated in 1989 or 1994. Those data were used the last time existing reactors evaluated their earthquake hazards.

The NRC identified the 27 reactors with the greatest risk increase but did not provide the risk numbers. The AP used the NRC’s data and methodology to calculate the risk increase for each reactor.

For a list of the 27 plants:

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