State issues insistent order about leaky Hanford tank

The Associated PressMarch 23, 2014 

RICHLAND — The state demanded Friday that the federal government begin removing radioactive liquid from a nuclear waste tank at the Hanford Site by Sept. 1.

The state Department of Ecology’s order requires pumping of the double-walled tank to begin about 18 months sooner than what the U.S. Department of Energy proposed.

Hanford for decades made plutonium for nuclear weapons, and the site contains the nation’s largest dump of radioactive wastes.

Double-walled Tank AY-102 was found to be leaking between its walls in October 2012. While many older single-walled tanks have leaked at Hanford, this is the first of the double-walled tanks found to have leaks.

The Ecology Department said that after months of discussions, it is clear the Energy Department is not willing to pump the tank in a timely manner.

“In order to meet legal requirements and to provide public health and environmental protection, the state believes this leaking double-shell tank must be addressed in the most aggressive manner possible,” Ecology Director Maia Bellon said. “Waiting another two years, at best, to initiate actions to address this hazardous condition is neither legally acceptable nor environmentally prudent.”

The Energy Department in Richland did not return a request for comment.

Underground Tank AY-102 contains about 850,000 gallons of liquid and sludge that is high in radioactivity and requires cooling to control waste temperatures, the state said.

In 2012, nuclear waste was found in the space between the two walls, called the annulus.

No waste is thought to have escaped, but a leak in the primary tank creates concern about a failure of the waste-cooling system and an increased risk of a leak into the environment, the state said.

In the order, state officials also demanded that the Energy Department submit a report within 90 days that evaluates the integrity of the secondary containment system, take monthly samples from the tank’s leak-detection pit to address potential leakage, conduct weekly video inspections of leaks and monthly video inspections of the space between the walls, initiate the removal of solid waste no later than Dec. 1, 2015, and remove enough waste to allow for an inspection to determine the cause of the leak by Dec. 1, 2016.

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