The San Onofre nuclear plant north of San Diego was closed last evening to deal with a radiation leak that regulators say posed no danger to the public or to plant workers. The plant's operators say a small quantity of radioactive gas escaped from a leaky tube in a steam generator, the Los Angeles Times reports.
The steam generator system was replaced just over a year ago and the plant is going to investigate why the new system leaked. San Onofre—located on the coast next to a military base in an earthquake-prone part of California—came under fresh scrutiny after the Fukushima disaster in Japan last year and was declared safe—although environmental groups want it shut down, ABC reports. (Read more San Onofre nuclear plant stories.)