Among these challenges are the management and disposal of radioactive waste stored in underground tanks at sites in three states: Hanford in Washington, Savannah River in South Carolina, and the Idaho National Laboratory (INL). Some of these tanks are deteriorating and are known or suspected to have leaked, contaminating soil and groundwater. How to decommission (i.e., close) the tanks in a cost-effective and timely manner that mitigates environmental risk and potential exposure of workers has been the subject of controversy. Potentially affected states and environmental organizations raised questions regarding how much waste would be left in the tanks and whether the grout would thoroughly mix with the residual waste to solidify and contain it safely. Waste Disposal Authority in P.L. After considerable debate, the 108 th Congress included provisions in Section 3116 of the Ronald W. Reagan National Defense Authorization Act for FY2005 ( P.L. 108-375 ) authorizing DOE to classify some of the tank waste in South Carolina and Idaho as incidental to reprocessing and to grout it in place. Congress did not provide this authority in Washington State, where most of the leaking tanks are located. 108-375 follows. The NAS acknowledged that using a cement grout is likely the most effective method currently available to immobilize the waste left in the tanks after all retrievable waste is removed, but noted that the long-term performance of the grout to safely contain the waste left in the tanks is uncertain and necessitates further research.
How to safely dispose of wastes from producing nuclear weapons has been an ongoing issue. The most radioactive portion of these wastes is stored in underground tanks at Department of Energy (DOE) sites in Idaho, South Carolina, and Washington State. There have been concerns about soil and groundwater contamination from some of the tanks that have leaked. DOE proposed to remove the "pumpable" liquid waste, classify the sludge-like remainder as "waste incidental to reprocessing," and seal it in the tanks with a cement grout. DOE has argued that closing the tanks in this manner would be a cost-effective and timely way to address environmental risks. Questions were raised as to how much waste would be left in the tanks and whether the grout would contain the waste and prevent leaks. After considerable debate, the 108th Congress included provisions in the Ronald W. Reagan National Defense Authorization Act for FY2005 (P.L. 108-375) authorizing DOE to grout some of the waste in the tanks in Idaho and South Carolina. Congress did not provide such authority in Washington State. This report provides background information on the disposal of radioactive tank waste, analyzes the waste disposal authority in P.L. 108-375, discusses the implementation of this authority, and examines relevant issues.