Officials at the San Onofre Nuclear Generating Station are working to fix a small hydrogen gas leak that began Sunday morning, according to the senior federal inspector at the plant.

A “very small” amount of hydrogen has been leaking from a water treatment system for steam generators at Unit 2, said U.S. Nuclear Regulatory Commission inspector Gregory Warnick.

A plant worker noticed abnormal pressure in the equipment, known as a “chemical treatment skid,” early Sunday, Warnick said. The leak was then verified by operators who placed soap on the tubing and noticed bubbles.

He added that officials at Southern California Edison, which operates the plant, then reported the leak to the California Emergency Management Agency at 8:09 a.m.

The leak presents no dangers to the public or plant officials, Warnick said.

“There’s no risk of any hydrogen accumulating anywhere. There’s no risk of flammability or explosion because of where it is,” he said.

Workers should have the leak contained in the next day or two, said Warnick. A Southern California Edison spokeswoman did not immediately return a message Monday morning seeking comment.

The plant has not been in operation since late January, when a small radiation leak was discovered.


Since you've made it this far,

You are obviously connected to your community and value good journalism. As an independent and local nonprofit, our news is accessible to all, regardless of what they can afford. Our newsroom centers on Orange County’s civic and cultural life, not ad-driven clickbait. Our reporters hold powerful interests accountable to protect your quality of life. But it’s not free to produce. It depends on donors like you.

Join the conversation: In lieu of comments, we encourage readers to engage with us across a variety of mediums. Join our Facebook discussion. Message us via our website or staff page. Send us a secure tip. Share your thoughts in a community opinion piece.