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The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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2025 ANS Annual Conference
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Smarter waste strategies: Helping deliver on the promise of advanced nuclear
At COP28, held in Dubai in 2023, a clear consensus emerged: Nuclear energy must be a cornerstone of the global clean energy transition. With electricity demand projected to soar as we decarbonize not just power but also industry, transport, and heat, the case for new nuclear is compelling. More than 20 countries committed to tripling global nuclear capacity by 2050. In the United States alone, the Department of Energy forecasts that the country’s current nuclear capacity could more than triple, adding 200 GW of new nuclear to the existing 95 GW by mid-century.
Peter Taylor, William H. Hocking,† Lawrence H. Johnson, Roderick J. McEachern, Sham Sunder
Nuclear Technology | Volume 116 | Number 2 | November 1996 | Pages 222-230
Technical Paper | Radioactive Waste Management | doi.org/10.13182/NT96-A35302
Articles are hosted by Taylor and Francis Online.
Issues relevant to the performance of irradiated (Th,Pu)O2 as a waste form for geological disposal are briefly reviewed. Fuels of this type are among those being considered for burning plutonium from dismantled nuclear weapons in power reactors, including Canada deuterium uranium (CANDU) systems. The high chemical stability and low aqueous solubility of thoria make this type offuel attractive as a waste form. In contrast with UO2 fuel, the inertness of thoria to oxidation dominates most of the chemical issues of fuel disposal. The overall performance of a thoria-based fuel waste form is likely to be determined by the “instant” release of the gap inventories of mobile fission products such as 129I. This in turn will be controlled largely by the inreactor power history and probably also by details of fuel fabrication. Limited experience with thoria-based fuels [chiefly (Th, U)O2] indicates that, for given power and burnup levels, gas releases can be substantially lower than with UO2 fuels. The gap and grain-boundary inventories of fission products are expected to be correspondingly low. A fabrication route involving molecular-level mixing (e.g., sol-gelprocess) would be preferable to powder blending, because microscopic heterogeneities in the fuel might adversely affect the retention of fission products. Pilot-scale irradiation, postirradiation examination, and leaching studies are required to support this preliminary assessment. Other issues that need to be addressed include impurity specifications (to minimize formation of long-lived activation products) and criticality and safeguards issues that might influence the design of fuel-handling facilities.
