SPOKANE — Hanford Nuclear Reservation officials prepared Tuesday to pump thousands of gallons of leaked radioactive waste back into a 46-year-old storage tank that contains toxic leftovers from the production of plutonium for nuclear weapons in Washington state.
Government officials said none of the radioactive waste appears to have been released into the environment, and there is no known danger to the public.
“The good news is right now we have no indications that waste has reached the environment,” said the U.S. Department of Energy, which owns the Hanford site. “We continue to monitor it and have leak detectors in the area.”
More than 3,000 gallons of radioactive waste leaked Sunday from the inner tank of a giant double-walled tank known as AY-102 into the space between the two walls.
Officials for federal contractor Washington River Protection Solutions were getting ready Tuesday to begin pumping the leaked waste back into the main tank, spokesman Jerry Holloway said.
Hanford for decades made plutonium for nuclear weapons, and now contains millions of gallons of radioactive waste stored in 177 underground tanks. The government is spending some $2 billion a year to clean up the sprawling site, a process that is expected to take decades.
The leak on Sunday occurred as workers were pumping out the contents of the million-gallon tank. Only about 45,000 gallons remained in the main tank, much of it in the form of a thick sludge.
Holloway said one theory for the leak is that efforts to remove the sludge, which involves shooting liquid through a nozzle, exposed a hole in the inner wall of the tank that allowed more than 3,000 gallons of waste to pour into the space between the two walls, which is called the annulus.
Pumping equipment had already been installed in the annulus in anticipation of such a leak, Holloway said.
In past years, about 70 gallons of waste had leaked into the annulus and dried in three spots. That is what precipitated the pumping of tank AY-102 in the first place.
Hanford contains 28 double-walled tanks and 149 single-walled tanks, some of which date back to its origins in World War II. Tank AY-102 went into service in 1970, and is Hanford’s oldest double-walled tank.
