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Integrated Analysis for Long-Term Degradation of Waste Package at the Potential Yucca Mountain Repository for High-Level Nuclear Waste Disposal

  • Joon H. Lee (a1), Kevin G. Mon (a2), Dennis E. Longsine (a3), Bryan E. Bullard (a2) and Ahmed M. Moniba (a4)...

Abstract

The technical basis for Site Recommendation (SR) of the potential repository for high-level nuclear waste at Yucca Mountain, Nevada has been completed. Long-term containment of the waste and subsequent slow release of radionuclides from the engineered barrier system (EBS) into the geosphere will rely on a robust waste package (WP) design, among other EBS components as well as the natural barrier system. The WP and drip shield (DS) degradation analyses for the total system performance assessment (TSPA) baseline model for the SR have shown that, based on the current corrosion models and assumptions, both the DSs and WPs do not fail within the regulatory compliance time period (10,000 years). From the perspective of initial WP failure time, the analysis results are encouraging because the upper bounds of the baseline case are likely to represent the worst case combination of key corrosion model parameters that significantly affect long-term performance of WPs in the potential repository. The estimated long life-time of the WPs in the current analysis is attributed mostly to the following two factors that delay the onset of stress corrosion cracking (SCC): (1) the stress mitigation to substantial depths from the outer surface in the dual closure-lid weld regions; and (2) the very low general-corrosion rate applied to the closure-lid weld regions to corrode the compressive stress zones. Uncertainties are associated with the current WP SCC analysis. These are stress mitigation on the closure-lid welds, characterization of manufacturing flaws applied to SCC, and general corrosion rate applied to the closurelid weld regions. These uncertainties are expected to be reduced as additional data and analyses are developed.

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1. Lee, J.H., Atkins, J.E., and andrews, R.W., in Scientific Basis for Nuclear Waste Management XIX, edited by Murphy, W.M. and Knecht, D.A., (Mater. Res. Soc. Proc. 412, Pittsburgh, PA, 1996) pp. 603611.
2. Atkins, J.E., Lee, J.H., and andrews, R.W., in Proc. of 7th International Conference on the High-Level Radioactive Waste Management, Am. Nucl. Soc., LaGrange Park, IL and Am. Soc. of Civil Engrs., New York, NY, pp. 459461 (1996).
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4. Lee, J.H., Mon, K.G., Longsine, D.E., and Bullard, B.E., in Scientific Basis for Nuclear Waste Management XXII, edited by Wronkiewicz, D.J. and Lee, J.H., (Mater. Res. Soc. Proc. 556, Pittsburgh, PA, 1999) pp. 567574.
5. Lee, J.H., Mon, K.G., Longsine, D.E., and Bullard, B.E., in Scientific Basis for Nuclear Waste Management XXII, edited by Wronkiewicz, D.J. and Lee, J.H., (Mater. Res. Soc. Proc. 556, Pittsburgh, PA, 1999) pp. 515523.
6. CRWMS M&O, Total System Performance Assessment-1995: An Evaluation of the Potential Yucca Mountain Repository, B00000000-01717-2200-00136 Rev. 01, Las Vegas, NV (1995).
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9. CRWMS M&O, WAPDEG Analysis of Waste Package and Drip Shield Degradation, ANL-EBS-PA-000001 REV 00 ICN 01, Las Vegas, NV (2000).

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Integrated Analysis for Long-Term Degradation of Waste Package at the Potential Yucca Mountain Repository for High-Level Nuclear Waste Disposal

  • Joon H. Lee (a1), Kevin G. Mon (a2), Dennis E. Longsine (a3), Bryan E. Bullard (a2) and Ahmed M. Moniba (a4)...

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