PHOENIX - One of three reactors at the nation's largest nuclear power plant complex is off-line because of a leak in a water-cooling system.
The reactor has been down at the Palo Verde Nuclear Generating Station in Wintersburg, 50 miles west of Phoenix, since operators discovered the leak Saturday.
The leak is non-nuclear and doesn't pose a threat, Betty Dayyo, a spokeswoman for Arizona Public Service Co., which operates the plant, said Monday.
She said the leak occurred in the reactor's water-cooling system. The system takes steam and turns it into cool water, which is then turned into steam again and used to turn four turbines that produce electricity.
Dayyo said APS hopes to have the reactor up and running by the end of the week.
"We're just being prudent about fixing it before we bring the unit back online and making sure everything is done correctly," she said.
The leak comes as a 20-member team from the Nuclear Regulatory Commission conducts a two-week inspection at the plant to assess performance problems.
Palo Verde has been on the regulatory hot seat since 2004.
The plant supplies electricity to some 4 million customers in Arizona, New Mexico, Texas and California.