But what if it did happen here? What would the consequences be? If Indian Point blew, how wide an area and how many people would be affected, and what would the cleanup costs be? Rigorously answering such questions is the only way to determine whether the potential risk to life and property is worthwhile.

The 104 commercial nuclear plants in the U.S. are getting old, and many have had serious problems over the years. There have been dozens of instances since 1979, the year of the Three Mile Island accident, in which nuclear reactors have had to be shut down for more than a year for safety reasons.

Building new plants, which the Obama administration favors, can be breathtakingly expensive and requires government loan guarantees. Banks are not lining up to lend money on their own for construction of the newest generation of Indian Points.