Simulation of Ventilation Efficiency, Temperatures, and Relative Humidities in Emplacement Drifts at Yucca Mountain, Nevada, Using Monte Carlo and Composite Thermal-Pulse Methods

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Predictions of waste canister and repository driftwall temperatures as a function of space and time are of fundamental importance to evaluating pre-closure and post-closure design requirements and performance assessment of the proposed repository for spent nuclear fuel and high-level radioactive waste at Yucca Mountain, Nevada. Variations in the lithostratigraphic features in densely welded and crystallized rocks of the 12.8-million-year-old Topopah Spring Tuff, especially the porosity resulting from lithophysal cavities, are projected 50 to 800 m from the Enhanced Characterization of the Repository Block cross drift to a simulated ''Panel 1'' emplacement drift. Lithophysal cavity porosity varies from 0.00 to 0.05 ... continued below

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6 pages

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Case, J. & Buesch, D. April 6, 2004.

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Description

Predictions of waste canister and repository driftwall temperatures as a function of space and time are of fundamental importance to evaluating pre-closure and post-closure design requirements and performance assessment of the proposed repository for spent nuclear fuel and high-level radioactive waste at Yucca Mountain, Nevada. Variations in the lithostratigraphic features in densely welded and crystallized rocks of the 12.8-million-year-old Topopah Spring Tuff, especially the porosity resulting from lithophysal cavities, are projected 50 to 800 m from the Enhanced Characterization of the Repository Block cross drift to a simulated ''Panel 1'' emplacement drift. Lithophysal cavity porosity varies from 0.00 to 0.05 cm{sup 3}/cm{sup 3} in the middle nonlithophysal zone and from 0.03 to 0.28 cm{sup 3}/cm{sup 3} in the lower lithophysal zone. Many thermal properties are related to lithophysal cavity porosity, and computer code titled ''Monte Carlo Simulation of Ventilation'' (MCSIMVENT) has been developed for simulating statistical variability and uncertainty along the simulated emplacement drift. The MCSIMVENT code, which is based on a composite thermal-pulse calculation, is used to calculate pre-closure ventilation efficiency and peak post-closure temperatures and relative humidities along the simulated emplacement drift for as much as 1,000 years. Variations in lithophysal porosity along the drift can result in a range in peak waste-package temperatures from 160 to 180 C for a single emplacement drift.

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6 pages

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INIS; OSTI as DE00837500

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  • Other Information: PBD: 6 Apr 2004

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  • Report No.: HT-FED2004-56617
  • Grant Number: NONE
  • DOI: 10.2172/837500 | External Link
  • Office of Scientific & Technical Information Report Number: 837500
  • Archival Resource Key: ark:/67531/metadc780881

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 6, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Feb. 11, 2016, 12:09 p.m.

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Case, J. & Buesch, D. Simulation of Ventilation Efficiency, Temperatures, and Relative Humidities in Emplacement Drifts at Yucca Mountain, Nevada, Using Monte Carlo and Composite Thermal-Pulse Methods, report, April 6, 2004; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc780881/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.