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So much for San Andreas: Reactors in East, Midwest, South have highest chance of damage.
The increase in risk is so rapid that an NRC research task force in September sent two recommendations to NRC management:
First, it is time to move the issue over from the research staff to the regulatory staff, moving from study to action.
Second, start figuring out whether some nuclear power plants need a "backfit," or additional construction to protect them from earthquakes.
Another indication of how fast the risk estimates rose: The median, or middle value out of all 104 reactors, a measure of the risk at the typical plant, is now at a 1 in 74,176 chance each year of core damage from a quake. In the old estimate, it was 1 in 263,158. In other words, the estimated risk, though still low by NRC standards, has more than tripled.