Supposedly any fallout is likely to hit the Northwest first. Current readings on that map are 14 in Vancouver, 38 in Seattle, 25 in San Francisco, and 18 in Arizona.
If the U.S. continues to build nuclear plants, I hope the government provides whatever subsidies are needed so that they can be way overbuilt. Leaving energy production solely to private corporations has led to too many disasters (Gulf of Mexico, Fukushima, etc.). The market doesn’t work when it comes to energy as externalities and tail risk is ignored. This disaster just proves once again what a fraud libertarianism is.
In the Fukushima case, I read that it was built for a 23 foot Tsunami. If the Japanese government had provided subsidies so that the plant could have withstood a 40 foot Tsunami, Japan wouldn’t be in this situation.