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Yucca Mountain Project Preclosure Ventilation Heat Transfer Analysis: Sensitivity of the Ventilation Efficiency to Uncertainties in Key Inputs and Design Parameters

[+] Author Affiliations
Veraun Chipman

Lawrence Livermore National Laboratory, Las Vegas, NV

John Case

Bechtel/SAIC Company, Las Vegas, NV

Paper No. HT-FED2004-56388, pp. 815-818; 4 pages
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 2, Parts A and B
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4691-1 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME


Preclosure ventilation is a key design feature of the repository to store high-level nuclear waste at Yucca Mountain. The efficiency of the ventilation to remove heat generated by radionuclide decay from the repository is predicted using a lumped parameter heat transfer analysis that considers thermal radiation, convection, and conduction in the drift and the surrounding rock mass. The sensitivity of the ventilation efficiency to uncertainties in key inputs and design parameters is investigated using a statistical approach known as the Delta Method. The standard deviation (normally distributed) of the ventilation efficiency about the mean of 88.0% is 2.6% for a 600-meter long drift. In addition, the influence of each of the standard deviations of the inputs and design parameters on the mean ventilation efficiency and standard deviation is determined. The results show that the most significant variables in the ventilation heat transfer analysis are the inlet air temperature, the air flow rate, the host rock thermal conductivity (as a function of matrix saturation and specific heat), and the convection heat transfer coefficients.

Copyright © 2004 by ASME



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