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Recent Submissions
Item Open Access Safety-Integrated Calibration and Validation of Simulation Models for Complex Innovative Intersections Using Bivariate Extreme Value Theory(Transportation Research Board (TRB), 2025-07-30)This paper presents a safety-integrated calibration and validation framework for microscopic traffic simulation models applied to two unconventional intersection designs: Diverging Diamond Interchanges (DDI) and Continuous Flow Intersection (CFI). Sites from Utah, United States, were modeled in PTV VISSIM and calibrated against three key Measures of Effectiveness (MOEs): Traffic Volume, Average Speed, and Crash Frequency. Unlike traditional calibration approaches, the proposed framework incorporates surrogate safety analysis directly into the calibration process by embedding bivariate Peak Over Threshold (POT) modeling from Extreme Value Theory (EVT). This method jointly captures conflict severity using Time to Collision (TTC) and Maximum Deceleration (MaxD), allowing crash frequency estimation from simulated conflicts. The calibration results showed strong agreement with field data, achieving GEH values below 5 for all movements and minimal speed errors. Simulation-based crash estimates differed from observed crash frequencies by only 0.07 crashes per year for the CFI. Validation using 2019 data further confirmed the predictive capability and generalizability of the models. This study contributes a robust and transferable framework for evaluating both operational efficiency and safety performance in innovative intersection design.Item Open Access Engaging Wyoming Communities in an Environmental Justice Approach for Advanced Nuclear Energy Facility Siting: Public Participation and Stakeholder Engagement Milestone Report(University of Wyoming Libraries, 2026-01-09)In November 2021, the private company, TerraPower, in partnership with electric utility, PacifiCorp, and the United States Department of Energy via its Advanced Reactor Demonstration Program, announced plans to site its Natrium advanced nuclear reactor near the retiring Naughton Power Plant in Kemmerer, located in southwest Wyoming. This marks the first commercial advanced nuclear energy facility to begin construction in the United States. Our research explores this case and aims to inform an adaptable community engagement process for advanced nuclear energy siting and development, as proposals to develop similar facilities are rapidly increasing. Public participation processes often receive critique for establishing only cursory informative or consultative opportunities for notice and comment rather than deeper opportunities for procedural justice. In July 2025 in Kemmerer, we hosted two public participation and stakeholder engagement meetings called Community Conversations on Natrium and Kemmerer’s Energy Future. This public participation and stakeholder engagement process focused on eliciting and documenting community members’ questions about and perspectives on opportunities and challenges related to the development and operation of the TerraPower Natrium advanced nuclear energy facility with an overall aim of community capacity-building. This document reports our methods for developing and implementing the Community Conversations meetings, findings from those meetings, and a suggested protocol for potential use in other advanced nuclear energy facility siting processes.Item Open Access Direct Community Economic Benefits from TerraPower’s Kemmerer Unit 1 Natrium Facility: A Research and Practice Brief for Engaging Communities in Advanced Nuclear Energy Facility Siting(University of Wyoming Libraries, 2026-01-07)In November 2021, the private company, TerraPower, in partnership with electric utility, PacifiCorp, and the United States Department of Energy via its Advanced Reactor Demonstration Program, announced plans to site its Natrium advanced nuclear reactor near the retiring Naughton Power Plant in Kemmerer, located in southwest Wyoming. This marks the first commercial advanced nuclear energy facility to begin construction in the United States. Our research explores this case and aims to inform an adaptable community engagement process for advanced nuclear energy siting and development, as proposals to develop similar facilities are rapidly increasing. Within this research, community members frequently asked not just what kind of and how many benefits may confer to the local community from the Natrium project, but where they come from, how they are shared, and when they will occur. We investigated those questions and worked to provide clear, evidence-based answers to share back with the community. This brief shares what we learned about direct economic benefits to local communities from the TerraPower Natrium facility.Item Open Access Protocol for Stakeholder Engagement in Advanced Nuclear Energy Facility Siting(University of Wyoming Libraries, 2026-01-07)This protocol outlines a replicable, community-based process for convening and facilitating public participation and stakeholder engagement meetings focused on the siting and development of advanced nuclear energy facilities. Methods developed, applied, and field-tested in Kemmerer, Wyoming in 2025 to engage local community members in discussing the opportunities and challenges related to the development and operation of the TerraPower Natrium facility have informed this protocol. Community-based organizations, local governments, researchers, and developers may replicate or adapt this protocol to support non-required public participation and stakeholder engagement in advanced nuclear energy facility (and other energy and industrial facility) siting processes.Item Open Access Digital data for the geologic map of the Seminoe Dam NE quadrangle, Carbon County, Wyoming(University of Wyoming Libraries, 2026-01-07)This data release contains a digitized version of the original 1:24,000-scale analog geologic map titled "Geologic map of the Seminoe Dam NE quadrangle, Carbon County, Wyoming," published by the U.S. Geological Survey in 1990. The database includes geospatial features (points, lines, and polygons) with matching attribute tables, nonspatial descriptive and reference tables, and ancillary resource files for correct symbolization, in formats that conform to the Geologic Map Schema (GeMS)--a standard format for the digital publication of geologic maps, available at http://ngmdb.usgs.gov/Info/standards/GeMS/.
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