SPOKANE — Underground nuclear waste storage tanks on the Hanford Nuclear Reservation continue to deteriorate, raising questions about how their contents will be managed in the future, according to a report released Tuesday by the Government Accountability Office.

Hanford, near Richland in eastern Washington, contains 177 nuclear waste tanks, some of which have leaked. The nation’s largest collection of radioactive waste is left over from the production of plutonium for nuclear weapons.

The GAO report said that both the older single-walled tanks and newer double-walled tanks are deteriorating. Some tanks date to the 1940s and are long past their designed lifespans.

The Energy Department agreed with the report and its recommendations.

But U.S. Sen. Ron Wyden, D-Ore., who requested the report, said the DOE was moving too slowly.

“Agreeing to recommendations is one thing; implementing them is another thing entirely,” Wyden said. “I’m asking for a schedule and a plan of action within 90 days.”