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Title: Volume calibration for nuclear materials control: ANSI N15.19-1989 and beyond

Abstract

Since the last IAEA International Safeguards Symposium, a revised standard for volume calibration methodology was issued in the United States. Because the new standard reflects the advent of high-precision volume measurement technology, it is significantly different from the earlier standard which it supersedes. The new standard outlines a unified data standardization model that applies to process tanks equipped with differential pressure measurement systems for determining liquid content. At the heart of the model is an algorithm to determine liquid height from pressure measurements that accounts for the major factors affecting the accuracy of those measurements. The standardization model also contains algorithms that adjust data from volumetric and gravimetric provers to a standard set of reference conditions. A key component of the standardization model is an algorithm to take account of temperature-induced dimensional changes in the tank. Improved methods for the statistical treatment of calibration data have also appeared since the last Safeguards Symposium. A statistical method of alignment has been introduced that employs a least-squares criterion to determine ``optimal`` alignment factors. More importantly, a statistical model has been proposed that yields plausible estimates of the variance of height and volume measurements when significant run-to-run differences are present in the calibrationmore » data. The new standardization model and statistical methods described here are being implemented in a portable, user-friendly software program for use by IAEA inspectors and statisticians. Perhaps these methods will eventually find their way into appropriate international standards.« less

Authors:
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (United States)
Sponsoring Org.:
International Atomic Energy Agency, Vienna (Austria)
OSTI Identifier:
10150034
Report Number(s):
PNL-SA-22838; CONF-940307-28
ON: DE94011231; TRN: 94:011983
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: International symposium on nuclear material safeguards,Vienna (Austria),14-18 Mar 1994; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; IAEA SAFEGUARDS; TANKS; CALIBRATION; NUCLEAR MATERIALS MANAGEMENT; VERIFICATION; STATISTICS; 055001; TECHNICAL ASPECTS

Citation Formats

Liebetrau, A.M. Volume calibration for nuclear materials control: ANSI N15.19-1989 and beyond. United States: N. p., 1994. Web.
Liebetrau, A.M. Volume calibration for nuclear materials control: ANSI N15.19-1989 and beyond. United States.
Liebetrau, A.M. Tue . "Volume calibration for nuclear materials control: ANSI N15.19-1989 and beyond". United States. https://www.osti.gov/servlets/purl/10150034.
@article{osti_10150034,
title = {Volume calibration for nuclear materials control: ANSI N15.19-1989 and beyond},
author = {Liebetrau, A.M.},
abstractNote = {Since the last IAEA International Safeguards Symposium, a revised standard for volume calibration methodology was issued in the United States. Because the new standard reflects the advent of high-precision volume measurement technology, it is significantly different from the earlier standard which it supersedes. The new standard outlines a unified data standardization model that applies to process tanks equipped with differential pressure measurement systems for determining liquid content. At the heart of the model is an algorithm to determine liquid height from pressure measurements that accounts for the major factors affecting the accuracy of those measurements. The standardization model also contains algorithms that adjust data from volumetric and gravimetric provers to a standard set of reference conditions. A key component of the standardization model is an algorithm to take account of temperature-induced dimensional changes in the tank. Improved methods for the statistical treatment of calibration data have also appeared since the last Safeguards Symposium. A statistical method of alignment has been introduced that employs a least-squares criterion to determine ``optimal`` alignment factors. More importantly, a statistical model has been proposed that yields plausible estimates of the variance of height and volume measurements when significant run-to-run differences are present in the calibration data. The new standardization model and statistical methods described here are being implemented in a portable, user-friendly software program for use by IAEA inspectors and statisticians. Perhaps these methods will eventually find their way into appropriate international standards.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}

Conference:
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