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Glass strategy: Hanford’s enhanced waste glass program
The mission of the Department of Energy’s Office of River Protection (ORP) is to complete the safe cleanup of waste resulting from decades of nuclear weapons development. One of the most technologically challenging responsibilities is the safe disposition of approximately 56 million gallons of radioactive waste historically stored in 177 tanks at the Hanford Site in Washington state.
ORP has a clear incentive to reduce the overall mission duration and cost. One pathway is to develop and deploy innovative technical solutions that can advance baseline flow sheets toward higher efficiency operations while reducing identified risks without compromising safety. Vitrification is the baseline process that will convert both high-level and low-level radioactive waste at Hanford into a stable glass waste form for long-term storage and disposal.
Although vitrification is a mature technology, there are key areas where technology can further reduce operational risks, advance baseline processes to maximize waste throughput, and provide the underpinning to enhance operational flexibility; all steps in reducing mission duration and cost.
V. Kumar, Nagendra Singh Raghaw, H. S. Palsania
Nuclear Science and Engineering | Volume 172 | Number 2 | October 2012 | Pages 151-163
Technical Paper | doi.org/10.13182/NSE11-41
Articles are hosted by Taylor and Francis Online.
A Monte Carlo code is developed in Visual Basic 6.0 for the study of radiation damage of pure metals irradiated by a neutron spectrum. At energies <10 MeV, development of cascades of elastic interactions of both primary neutrons and secondary recoiled atoms is incorporated. In a collision, kinetic energy given to an atom below or above the threshold displacement energy Ed (eV) is calculated along with the displacements. Displacements, defect production efficiency η, and damage energy Tdam are estimated to relate to the physical changes in the irradiated metal and to estimate the displacements per atom. The code is validated by determining the defect density on the surface of irradiated thin nickel foil and comparing with the hill-hock density of displaced atoms, using atomic force microscopy. In the case of irradiation of a niobium sample, stress-strain and I-V characteristics are measured before and after the irradiation by neutrons from an Am-Be source, and both stress and electrical resistance are shown to be enhanced after the irradiation.