Yes, the article notes that, "The United States used a barge-based reactor to generate electricity for the Panama Canal Zone from 1968 until 1976, and Westinghouse, the American reactor builder, planned — but never built — two floating plants off the New Jersey coast at around that time"

1968! The interesting story is why the NYT's is running this and running with it now [not trying to be tin-hat, maybe it was just a slow news day, but you can find links posted on HN going back almost 5 years about this project]