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Title: SWEPP PAN assay system uncertainty analysis: Passive mode measurements of graphite waste

Abstract

The Idaho National Engineering and Environmental Laboratory is being used as a temporary storage facility for transuranic waste generated by the U.S. Nuclear Weapons program at the Rocky Flats Plant (RFP) in Golden, Colorado. Currently, there is a large effort in progress to prepare to ship this waste to the Waste Isolation Pilot Plant (WIPP) in Carlsbad, New Mexico. In order to meet the TRU Waste Characterization Quality Assurance Program Plan nondestructive assay compliance requirements and quality assurance objectives, it is necessary to determine the total uncertainty of the radioassay results produced by the Stored Waste Examination Pilot Plant (SWEPP) Passive Active Neutron (PAN) radioassay system. To this end a modified statistical sampling and verification approach has been developed to determine the total uncertainty of a PAN measurement. In this approach the total performance of the PAN nondestructive assay system is simulated using computer models of the assay system and the resultant output is compared with the known input to assess the total uncertainty. This paper is one of a series of reports quantifying the results of the uncertainty analysis of the PAN system measurements for specific waste types and measurement modes. In particular this report covers passive mode measurementsmore » of weapons grade plutonium-contaminated graphite molds contained in 208 liter drums (waste code 300). The validity of the simulation approach is verified by comparing simulated output against results from measurements using known plutonium sources and a surrogate graphite waste form drum. For actual graphite waste form conditions, a set of 50 cases covering a statistical sampling of the conditions exhibited in graphite wastes was compiled using a Latin hypercube statistical sampling approach.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Idaho National Engineering Lab., Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)
OSTI Identifier:
565582
Report Number(s):
INEEL/EXT-97-00812
ON: DE98050364; TRN: 98:002517
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1997
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; WIPP; IDAHO NATIONAL ENGINEERING LABORATORY; RADIOACTIVE WASTE MANAGEMENT; ALPHA-BEARING WASTES; RADIOACTIVE WASTE DISPOSAL; RADIOACTIVE WASTE STORAGE; ROCKY FLATS PLANT; UNDERGROUND FACILITIES; CONTAINERS; STATISTICAL DATA; DATA COVARIANCES; GRAPHITE

Citation Formats

Blackwood, L G, Harker, Y D, Meachum, T R, and Yoon, Woo Y. SWEPP PAN assay system uncertainty analysis: Passive mode measurements of graphite waste. United States: N. p., 1997. Web. doi:10.2172/565582.
Blackwood, L G, Harker, Y D, Meachum, T R, & Yoon, Woo Y. SWEPP PAN assay system uncertainty analysis: Passive mode measurements of graphite waste. United States. https://doi.org/10.2172/565582
Blackwood, L G, Harker, Y D, Meachum, T R, and Yoon, Woo Y. Tue . "SWEPP PAN assay system uncertainty analysis: Passive mode measurements of graphite waste". United States. https://doi.org/10.2172/565582. https://www.osti.gov/servlets/purl/565582.
@article{osti_565582,
title = {SWEPP PAN assay system uncertainty analysis: Passive mode measurements of graphite waste},
author = {Blackwood, L G and Harker, Y D and Meachum, T R and Yoon, Woo Y},
abstractNote = {The Idaho National Engineering and Environmental Laboratory is being used as a temporary storage facility for transuranic waste generated by the U.S. Nuclear Weapons program at the Rocky Flats Plant (RFP) in Golden, Colorado. Currently, there is a large effort in progress to prepare to ship this waste to the Waste Isolation Pilot Plant (WIPP) in Carlsbad, New Mexico. In order to meet the TRU Waste Characterization Quality Assurance Program Plan nondestructive assay compliance requirements and quality assurance objectives, it is necessary to determine the total uncertainty of the radioassay results produced by the Stored Waste Examination Pilot Plant (SWEPP) Passive Active Neutron (PAN) radioassay system. To this end a modified statistical sampling and verification approach has been developed to determine the total uncertainty of a PAN measurement. In this approach the total performance of the PAN nondestructive assay system is simulated using computer models of the assay system and the resultant output is compared with the known input to assess the total uncertainty. This paper is one of a series of reports quantifying the results of the uncertainty analysis of the PAN system measurements for specific waste types and measurement modes. In particular this report covers passive mode measurements of weapons grade plutonium-contaminated graphite molds contained in 208 liter drums (waste code 300). The validity of the simulation approach is verified by comparing simulated output against results from measurements using known plutonium sources and a surrogate graphite waste form drum. For actual graphite waste form conditions, a set of 50 cases covering a statistical sampling of the conditions exhibited in graphite wastes was compiled using a Latin hypercube statistical sampling approach.},
doi = {10.2172/565582},
url = {https://www.osti.gov/biblio/565582}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {7}
}