Stochastic hydrogeologic units and hydrogeologic properties development for total-system performance assessments. Yucca Mountain Site Characterization Project

Schenker, A.R.; Guerin, D.C.; Robey, T.H.; Rautman, C.A.; Barnard, R.W.

doi:10.2172/110776

Cited by 12 publications

(25 citation statements)

References 22 publications

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“…This assumption not used. (Schenker et al 1995), are representative of Busted Butte properties. The intended use of this information is for scoping and sensitivity only; therefore, these data are acceptable to use as a baseline and require no further confirmation.…”

Section: Buttementioning

confidence: 99%

“…To model unsaturated flow, the constitutive relationships between capillary pressure and unsaturated hydraulic conductivity and between capillary pressure and saturation must also be specified. Although the parameters characterizing these relationships are reported in the YMP databases (Schenker et al 1995;Flint 1998), these are based on the van Genuchten model (van Genuchten 1980, pp. 892-808).…”

Section: Stochastic Modelingmentioning

confidence: 99%

“…In this study, the Gardner-Russo parameter a is estimated from the reported van Genuchten parameters by matching the main features of the retention curves for these two models. The first row of Table 35 summarizes the relevant parameters that are taken or estimated from the YMP databases (Schenker et al 1995). No information is found with respect to the correlation lengths of the logarithm of the hydraulic conductivity and pore size distribution.…”

Section: Stochastic Modelingmentioning

confidence: 99%

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Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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Section: Buttementioning

confidence: 99%

Section: Stochastic Modelingmentioning

confidence: 99%

Section: Stochastic Modelingmentioning

confidence: 99%

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Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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“…For the most part, interpreted data from the past performance assessment of the potential repository at Yucca Mountain by Sandia (Wilson et al, 1994;Schenker et al, 1995;M&07 1995a) were used for all geologic components of the disposal system without re-evaluation. Exceptions are parameters for which new data were available, specifically, saturation curves (as defined by the van Genuchten model [van Genuchten, 19801) and the porosity of the modeling units.…”

Section: -Lmentioning

confidence: 99%

Update to Assessment of Direct Disposal in Unsaturated Tuff of Spent Nuclear Fuel and High-Level Waste Owned by U.S. Department of Energy

Wheatley¹,

Rechard²

1998

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The overall purpose of this study is to provide information and ,@dance to the Office of Environmental Management of the U.S. Department of Energy (DOE) about the level of characterization necessary to dispose of DOE-owned spent nuclear fuel (SNF). The disposd option modeled was codisposal of DOE SNF with defense high-level waste (DHLN). A specific goal was to demonstrate the influence of DOE SNF, expected to be minor, in a predominately commercial repository using modeling conditions similar to those currently assumed by the Yucca Mountain Project (YMP). A performance assessment (PA) was chosen as the method of analysis. The performance metric for this analysis (referred to as the 1997 PA) was dose to an individual; the time period of interest was 100,000 yr. Results indicated that cumulative releases of "Tc and 237Np (primary contributors to human dose) fiom commercial SNF exceed those of DOE SNF both on a per MTHM and per package basis. Thus, if commercial SNF can meet regulatory performance criteria for dose to an individual, then the DOE SM; can also meet the criteria. This result is due in large part to lower burnup of the DOE SNF (less time for irradiation) and to the DOE SNF's small percentage of the total activity (1.5%) and mass (3.8%) of waste in the potential repository. Consistent-with the analyses performed for the YMP, the 1997 PA assumed all cladding as failed, which also contributed to the relatively poor performance of commercial SNF compared to DOE SNF.September 30, 1998 i .. PrefaceThis study, the 1997 performance assessment (1997 PA), evaluates whether spent nuclear fuel (SNF) owned by the Office of Environmental Management of the U. S. Department of Energy (DOE) performs noticeably better (or worse) than commercial SNF, and identifies important parameters that influence this performance after disposal. The latter results, in particular, are intended to help define appropriate requirements for waste characterization with regard to DOE-owned SNF being accepted for disposal. The study is part of a broader DOE program, the National Spent Nuclear Fuel Program, for developing a safe, cost-effective technical strategy for the interim management and ultimate disposition of the foreign and domestic spent nuclear fuel under the DOE'S jurisdiction. The DOE-owned SNF is currently stored at three primary sites (Idaho National Engineering and Environmental Laboratory [INEEL], the Hanford reservation, and the Savannah River plant) and several secondary DOE sites. The SNF originated in experimental, defense, and foreign reactors. Organization of ReportThis report is a detailed account of the analysis design and results. The introductory chapter describes the analysis goals and approach, highlights some of the analysis decisions made during the assessment, and sets the stage for the data and concepts that are presented in later chapters. Chapter 2 provides information on the performance measures and assumptions made with regard to modeling style.The remaining chapters cover the tasks of performance...

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“…The hydrogeologic database developed by Schenker et al (1995) was used as the source for matrix and fracture properties. In order to account for the uncertainty/variability in matrix hydrologic properties, ten random sets of values for porosity, saturated conductivity and the two van Genuchten parameters were generated.…”

Section: Es52 Site-scale Unsaturated Flow Model and Abstractionsmentioning

confidence: 99%