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Decommissioning & Environmental Sciences
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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Las Vegas, NV|Mandalay Bay Resort and Casino
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Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
Si Y. Lee, Robert L. Sindelar, David C. Losey
Nuclear Technology | Volume 131 | Number 1 | July 2000 | Pages 124-151
Technical Paper | Radioactive Waste Management and Disposal | doi.org/10.13182/NT00-A3108
Articles are hosted by Taylor and Francis Online.
Thermal models are constructed and analyses are performed of aluminum-based spent nuclear fuel (Al-SNF) in interim dry storage and geologic disposal configurations. Two models are developed, referred to as the interim storage model and the codisposal waste package (WP) model. Time-dependent source terms of Al-SNF forms and the defense high-level waste (DHLW) canisters are also developed for thermal performance analysis of the geologic codisposal WP.The interim storage model is a three-dimensional conduction-convection conjugate model to investigate the natural convection cooling of a sealed dry storage canister with vertical orientation in a dry storage vault. The analysis is made for various decay heat sources (equivalent to 25 to 35 kW/m3) using various boundary conditions around the canister wall and with backfilled nitrogen or helium gas. Based on the data obtained from the Savannah River Site experimental work and available from the literature, an improved dimensionless correlation for the external heat transfer of the canister by the airflow crossing normal to the staggered tubes is developed.The codisposal WP model considers heat transfer driven by conduction and convection processes combined with radiation for the thermal performance study of an enclosed WP containing one Al-SNF canister and five DHLW glass canisters. Two-dimensional analysis for a representative cross-sectional area of the codisposal WP is performed because each component has a large aspect ratio of package length to diameter and the package is laid down horizontally in a drift tunnel repository. The results showed that the codisposal disposition options for the helium- and air-filled WPs satisfied the present waste acceptance criteria for the WP design under the reference conditions.