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Disposal Concepts for a High-Temperature Repository in Shale

Stein, Emily; Bryan, Charles R.; Dobson, David C.; Hardin, Ernest; Jove-Colon, Carlos; Lopez, Carlos M.; Matteo, Edward N.; Mohanty, Sitakanta; Pendleton, Martha W.; Bays, Nathan R.; Prouty, Jeralyn; Sassani, David C.; Wang, Yifeng; Rutqvist, Jonny; Zheng, Liange; Sauer, Kirsten; Caporuscio, Florie; Howard, Robert; Adeniyi, Abiodun; Joseph, Robby

Disposal of large, heat-generating waste packages containing the equivalent of 21 pressurized water reactor (PWR) assemblies or more is among the disposal concepts under investigation for a future repository for spent nuclear fuel (SNF) in the United States. Without a long (>200 years) surface storage period, disposal of 21-PWR or larger waste packages (especially if they contain high-burnup fuel) would result in in-drift and near-field temperatures considerably higher than considered in previous generic reference cases that assume either 4-PWR or 12-PWR waste packages (Jové Colón et al. 2014; Mariner et al. 2015; 2017). Sevougian et al. (2019c) identified high-temperature process understanding as a key research and development (R&D) area for the Spent Fuel and Waste Science and Technology (SFWST) Campaign. A two-day workshop in February 2020 brought together campaign scientists with expertise in geology, geochemistry, geomechanics, engineered barriers, waste forms, and corrosion processes to begin integrated development of a high-temperature reference case for disposal of SNF in a mined repository in a shale host rock. Building on the progress made in the workshop, the study team further explored the concepts and processes needed to form the basis for a high-temperature shale repository reference case. The results are described in this report and summarized..

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TYPE Other Report YEAR 2020
DOIOSTI

First-Round Testing of the Brine Availability Test in Salt (BATS) at the Waste Isolation Pilot Plant (WIPP)

Kuhlman, Kristopher L.; Mills, Melissa M.; Jayne, Richard S.; Herrick, Courtney G.; Choens, Robert C.; Nemer, Martin; Heath, Jason E.; Matteo, Edward N.; Xiong, Yongliang; Otto, Shawn; Dozier, Brian; Weaver, Doug; Stauffer, Phil; Guiltinan, Eric; Boukhalfa, Hakim; Rahn, Thom; Wu, Yuxin; Rutqvist, Jonny; Hu, Mengsu; Crandall, Dustin

Abstract not provided.

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TYPE Conference Poster YEAR 2020
DOIOSTI

Evaluation of Engineered Barrier Systems FY20 Report

Matteo, Edward N.; Dewers, Thomas; Gomez, Steven P.; Hadgu, Teklu; Zheng, L.; Lammers, L.; Fox, P.; Chang, C.; Xu, H.; Borglin, S.; Whittaker, M.; Chou, C.; Tournassat, N.; Subramanian, S.; Wu, Y.; Nico, P.; Gilbert, B.; Kneafsey, T.; Caporuscio, F.; Sauer, K.B.; Rock, M.J.; Kalintsev, A.; Migdissov, A.; Alcorn, C.; Buck, E.C.; Yu, X-Y; Yao, J.; Son, J.; Reichers, S.L.; Klein-Bendavid, O.; Bar-Nes, G.; Meeusen, J.C.L.; Gruber, C.; Steen, M.; Brown, K.G.; Delapp, R.; Taylor, A.; Ayers, J.; Kosson, D.S.

This report describes research and development (R&D) activities conducted during fiscal year 2020 (FY20) specifically related to the Engineered Barrier System (EBS) R&D Work Package in the Spent Fuel and Waste Science and Technology (SFWST) Campaign supported by the United States (U.S.) Department of Energy (DOE). The R&D activities focus on understanding EBS component evolution and interactions within the EBS, as well as interactions between the host media and the EBS. A primary goal is to advance the development of process models that can be implemented directly within the Generic Disposal System Analysis (GDSA) platform or that can contribute to the safety case in some manner such as building confidence, providing further insight into the processes being modeled, establishing better constraints on barrier performance, etc. The FY20 EBS activities involved not only modeling and analysis work, but experimental work as well. Despite delays to some planned activities due to COVID-19 precautions, progress was made during FY20 in multiple research areas and documented in this report as follows: (1) EBS Task Force: Task 9/FEBEX Modeling Final Report: Thermo-Hydrological Modeling with PFLOTRAN, (2) preliminary sensitivity analysis for the FEBEX in-situ heater test, (3) cement-carbonate rock interaction under saturated conditions: from laboratory to modeling, (4) hydrothermal experiments, (5) progress on investigating the high temperature behavior of the uranyl-carbonate complexes, (6) in-situ and electrochemical work for model validation, (7) investigation of the impact of high temperature on EBS bentonite with THMC modeling, (8) sorption and diffusion experiments on bentonite, (9) chemical controls on montmorillonite structure and swelling pressure, (10) microscopic origins of coupled transport processes in bentonite, (11) understanding the THMC evolution of bentonite in FEBEX-DP—coupled THMC modeling, (12) modeling in support of HotBENT, an experiment studying the effects of high temperatures on clay buffers/near-field, and (13) high temperature heating and hydration column test on bentonite.

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TYPE Other Report YEAR 2020
DOIOSTI
Results 76–100 of 248
Results 76–100 of 248
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