In revising the definition of high level radioactive waste unsuitable for dumping at sea, calculations of water concentrations in and near a dump site have been made and used to estimate doses to 'typical' marine species living at or near the sea floor at a depth of 4000 m. These calculations show that there are radionuclides that can give rise to significant doses to these typical species and that future revisions of the Definition and Recommendations under the Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter will have to consider impacts on the marine ecosystem in setting limits for dumping.

The U.S. Department of Energy (DOE) manages dozens of sites across the nation that focus on research, design, and production of nuclear weapons and nuclear reactors for defense applications. Radioactive wastes at these sites pose a national challenge, and DOE is considering how to most effectively clean them up. Some of the greatest projected risks, cleanup costs, and technical challenges come from processing and disposing transuranic and high-level radioactive waste. This report addresses how DOE should incorporate risk into decisions about whether the nation should use alternatives to deep geologic disposal for some of these wastes. It recommends using an exemption process involving risk assessment for determining how to dispose of problematic wastes. The report outlines criteria for risk assessment and key elements of a risk-informed approach. The report also describes the types of wastes that are candidates for alternative disposition paths, potential alternatives to deep geologic disposal for disposition of low-hazard waste, and whether these alternatives are compatible with current regulations.

This report sets out the costs of operating disposal sites for LLW in OECD countries, as well as the factors that may affect the costs of sites being developed.