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Title: Temperature Effects on seepage Fluid Compositions at Yucca Mountain

Abstract

This project investigated the effect of two repository operating temperature modes on coupled thermal, hydrological, and chemical processes around potential nuclear waste-emplacement tunnels (drifts) at Yucca Mountain, Nevada. The main objective of this study was to evaluate the composition of fluids (water and gas) that could enter the drifts, because these data directly relate to the performance of waste canisters and other in-drift engineered systems over the life of the potential repository. Multicomponent reactive transport simulations were performed using TOUGHREACT, initially written by T. Xu and K. Pruess at LBNL and modified here to handle high-temperature and boiling environments. Two repository operating temperature modes were investigated: (1) a ''high-temperature'' mode, which considered a short preclosure ventilation period (50 years) and gave rise to above-boiling temperatures in rocks around the drift for hundreds of years, and (2) a ''low-temperature'' mode with a smaller heat load and longer preclosure ventilation (300 years), yielding temperatures at the surface of the waste package below 85 C (a design threshold) and thus below boiling conditions. Simulations under ambient conditions (no heat load) were also conducted to serve as a baseline for comparing results of thermal-loading simulations.

Authors:
;
Publication Date:
Research Org.:
Yucca Mountain Project, Las Vegas, Nevada (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
786552
Report Number(s):
MOL.20010808.0254
DC 28992; TRN: US0502271
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2001
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; BOILING; CONTAINERS; DESIGN; PERFORMANCE; TEMPERATURE DEPENDENCE; TRANSPORT; VENTILATION; WASTES; WATER; YUCCA MOUNTAIN

Citation Formats

Spycher, Nicolas, and Sonnenthal, Eric. Temperature Effects on seepage Fluid Compositions at Yucca Mountain. United States: N. p., 2001. Web. doi:10.2172/786552.
Spycher, Nicolas, & Sonnenthal, Eric. Temperature Effects on seepage Fluid Compositions at Yucca Mountain. United States. https://doi.org/10.2172/786552
Spycher, Nicolas, and Sonnenthal, Eric. Fri . "Temperature Effects on seepage Fluid Compositions at Yucca Mountain". United States. https://doi.org/10.2172/786552. https://www.osti.gov/servlets/purl/786552.
@article{osti_786552,
title = {Temperature Effects on seepage Fluid Compositions at Yucca Mountain},
author = {Spycher, Nicolas and Sonnenthal, Eric},
abstractNote = {This project investigated the effect of two repository operating temperature modes on coupled thermal, hydrological, and chemical processes around potential nuclear waste-emplacement tunnels (drifts) at Yucca Mountain, Nevada. The main objective of this study was to evaluate the composition of fluids (water and gas) that could enter the drifts, because these data directly relate to the performance of waste canisters and other in-drift engineered systems over the life of the potential repository. Multicomponent reactive transport simulations were performed using TOUGHREACT, initially written by T. Xu and K. Pruess at LBNL and modified here to handle high-temperature and boiling environments. Two repository operating temperature modes were investigated: (1) a ''high-temperature'' mode, which considered a short preclosure ventilation period (50 years) and gave rise to above-boiling temperatures in rocks around the drift for hundreds of years, and (2) a ''low-temperature'' mode with a smaller heat load and longer preclosure ventilation (300 years), yielding temperatures at the surface of the waste package below 85 C (a design threshold) and thus below boiling conditions. Simulations under ambient conditions (no heat load) were also conducted to serve as a baseline for comparing results of thermal-loading simulations.},
doi = {10.2172/786552},
url = {https://www.osti.gov/biblio/786552}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {6}
}