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Title: Stationary and protable instruments for assay of HEU (highly enriched uranium) solids holdup

Abstract

Two NaI(Tl)-based instruments, one stationary and one portable, designed for automated assay of highly enriched uranium (HEU) solids holdup, are being evaluated at the scrap recovery facility of the Oak Ridge Y-12 Plant. The stationary instrument, a continuous monitor of HEU within the filters of the chip burner exhaust system, measures the HEU deposits that accumulate erratically and rapidly during chip burner operation. The portable system was built to assay HEU in over 100 m of elevated piping used to transfer UO/sub 3/, UO/sub 2/, and UF/sub 4/ powder to, from, and between the fluid bed conversion furnances and the powder storage hoods. Both instruments use two detector heads. Both provide immediate automatic readout of accumulated HEU mass. The 186-keV /sup 235/U gamma ray is the assay signature, and the 60-keV gamma ray from an /sup 241/Am source attached to each detector is used to normalize the 186-keV rate. The measurement geometries were selected for compatibility with simple calibration models. The assay calibrations were calculated from these models and were verified and normalized with measurements of HEU standards built to match geometries of uniform accumulations on the surfaces of the process equipment. This instrumentation effort demonstrates that simple calibration modelsmore » can often be applied to unique measurement geometries, minimizing the otherwise unreasonable requirements for calibration standards and allowing extension of the measurements to other process locations.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
OSTI Identifier:
5903266
Report Number(s):
LA-UR-87-3739; CONF-871110-10
ON: DE88003172
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 3. international conference on facility operations safeguards interface, San Diego, CA, USA, 29 Nov 1987; Other Information: Paper copy only, copy does not permit microfiche production
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; HIGHLY ENRICHED URANIUM; NONDESTRUCTIVE ANALYSIS; MONITORS; EVALUATION; NUCLEAR MATERIALS MANAGEMENT; ACCOUNTING; Y-12 PLANT; NAI DETECTORS; SCRAP METALS; SOLIDS; ACTINIDES; CHEMICAL ANALYSIS; ELEMENTS; ENRICHED URANIUM; ISOTOPE ENRICHED MATERIALS; MANAGEMENT; MATERIALS; MEASURING INSTRUMENTS; METALS; NATIONAL ORGANIZATIONS; RADIATION DETECTORS; SCINTILLATION COUNTERS; SCRAP; SOLID SCINTILLATION DETECTORS; SOLID WASTES; URANIUM; US AEC; US DOE; US ERDA; US ORGANIZATIONS; WASTES; 055001* - Nuclear Fuels- Safeguards, Inspection, & Accountability- Technical Aspects; 440101 - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments

Citation Formats

Russo, P A, Sprinkle, Jr, J K, Stephens, M M, Brumfield, T L, Gunn, C S, and Watson, D R. Stationary and protable instruments for assay of HEU (highly enriched uranium) solids holdup. United States: N. p., 1987. Web.
Russo, P A, Sprinkle, Jr, J K, Stephens, M M, Brumfield, T L, Gunn, C S, & Watson, D R. Stationary and protable instruments for assay of HEU (highly enriched uranium) solids holdup. United States.
Russo, P A, Sprinkle, Jr, J K, Stephens, M M, Brumfield, T L, Gunn, C S, and Watson, D R. Thu . "Stationary and protable instruments for assay of HEU (highly enriched uranium) solids holdup". United States. https://www.osti.gov/servlets/purl/5903266.
@article{osti_5903266,
title = {Stationary and protable instruments for assay of HEU (highly enriched uranium) solids holdup},
author = {Russo, P A and Sprinkle, Jr, J K and Stephens, M M and Brumfield, T L and Gunn, C S and Watson, D R},
abstractNote = {Two NaI(Tl)-based instruments, one stationary and one portable, designed for automated assay of highly enriched uranium (HEU) solids holdup, are being evaluated at the scrap recovery facility of the Oak Ridge Y-12 Plant. The stationary instrument, a continuous monitor of HEU within the filters of the chip burner exhaust system, measures the HEU deposits that accumulate erratically and rapidly during chip burner operation. The portable system was built to assay HEU in over 100 m of elevated piping used to transfer UO/sub 3/, UO/sub 2/, and UF/sub 4/ powder to, from, and between the fluid bed conversion furnances and the powder storage hoods. Both instruments use two detector heads. Both provide immediate automatic readout of accumulated HEU mass. The 186-keV /sup 235/U gamma ray is the assay signature, and the 60-keV gamma ray from an /sup 241/Am source attached to each detector is used to normalize the 186-keV rate. The measurement geometries were selected for compatibility with simple calibration models. The assay calibrations were calculated from these models and were verified and normalized with measurements of HEU standards built to match geometries of uniform accumulations on the surfaces of the process equipment. This instrumentation effort demonstrates that simple calibration models can often be applied to unique measurement geometries, minimizing the otherwise unreasonable requirements for calibration standards and allowing extension of the measurements to other process locations.},
doi = {},
url = {https://www.osti.gov/biblio/5903266}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

Conference:
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