Abstract #301438

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JSM 2002 Abstract #301438
Activity Number: 77
Type: Contributed
Date/Time: Monday, August 12, 2002 : 8:30 AM to 10:20 AM
Sponsor: Section on Physical & Engineering Sciences*
Abstract - #301438
Title: Upper Tolerance Intervals Adjusted for Multiple Nuisance Uncertainties in a Nuclear Waste Glass Application (Part 1)
Author(s): Greg Piepel*+ and Scott Cooley
Affiliation(s): Battelle-Pacific Northwest Division and Battelle-Pacific Northwest Division
Address: P.O. Box 999, Richland, Washington, 99352, USA
Keywords: Tolerance Interval ; Nuisance Uncertainties ; Nuclear Waste Glass ; Variation
Abstract:

The Waste Treatment Plant (WTP) at the Hanford Site near Richland, WA, will produce canisters of nuclear waste glass for long-term disposal. The waste glass must satisfy many requirements, including upper limits on chemical releases from standard leach tests. Part of the strategy for meeting chemical release limits is to use X%/Y% upper tolerance intervals (UTI). An X%/Y% UTI provides high confidence (X%) that a high percentage of waste glass (at least Y%) produced over a specified production period has chemical releases below a limit. During WTP operation, the data to calculate X%/Y% UTIs will consist of regression model predictions of releases based on composition analyses of process or product samples. X%/Y% UTI formulas were developed to address the source of variation of interest (variation in true chemical releases due to variation in true glass compositions over the specified production period), as well as sampling, analytical, and regression nuisance uncertainties. Two X%/Y% UTI formulas were developed; one that adjusts for nuisance uncertainties, and the other that does not. Part 1 describes the application and summarizes the theoretical development of the new UTI formulas.

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