The progress of a Department of Energy program to clean up the nation’s most dangerous nuclear waste sites appears to be slowing down even though it’s still devouring billions of dollars.

That discouraging picture emerges in the latest report by the federal Government Accountability Office on the long-running cleanup effort. Launched in 1989, it was designed to clean up 107 sites engaged in research or production of enriched uranium or plutonium for making nuclear weapons.

Cleanup work at 91 of the Cold War-era sites is finished. But the remaining 16 pose the greatest health risks – especially those with underground storage tanks leaking highly radioactive waste.

Testifying last week before the House Subcommittee on Oversight and Investigations, a GAO official said that for reasons that are unclear, estimated cleanup costs at the 16 ”biggest and scariest sites” have increased by $214 billion despite the Department of Energy (DOE) spending $48 billion since 2011.

David C. Trimble, the GAO’s director for natural resources and the environment, said the soaring costs ”are getting worse as the growth in cleanup liabilities vastly outpaces [the DOE’s] ability to reduce them.”

DOE officials […]

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