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Title: Viability Study for an Unattended UF 6 Cylinder Verification Station: Phase I Final Report

Abstract

In recent years, the International Atomic Energy Agency (IAEA) has pursued innovative techniques and an integrated suite of safeguards measures to address the verification challenges posed by the front end of the nuclear fuel cycle. Among the unattended instruments currently being explored by the IAEA is an Unattended Cylinder Verification Station (UCVS) that could provide automated, independent verification of the declared relative enrichment, 235U mass, total uranium mass and identification for all declared UF 6 cylinders in a facility (e.g., uranium enrichment plants and fuel fabrication plants). Under the auspices of the United States and European Commission Support Programs to the IAEA, a project was undertaken to assess the technical and practical viability of the UCVS concept. The US Support Program team consisted of Pacific Northwest National Laboratory (PNNL, lead), Los Alamos National Laboratory (LANL), Oak Ridge National Laboratory (ORNL) and Savanah River National Laboratory (SRNL). At the core of the viability study is a long-term field trial of a prototype UCVS system at a Westinghouse fuel fabrication facility. A key outcome of the study is a quantitative performance evaluation of two nondestructive assay (NDA) methods being considered for inclusion in a UCVS: Hybrid Enrichment Verification Array (HEVA), and Passivemore » Neutron Enrichment Meter (PNEM). This report provides context for the UCVS concept and the field trial: potential UCVS implementation concepts at an enrichment facility; an overview of UCVS prototype design; field trial objectives and activities. Field trial results and interpretation are presented, with a focus on the performance of PNEM and HEVA for the assay of over 200 “typical” Type 30B cylinders, and the viability of an “NDA Fingerprint” concept as a high-fidelity means to periodically verify that the contents of a given cylinder are consistent with previous scans. A modeling study, combined with field-measured instrument uncertainties, provides an assessment of the partial-defect sensitivity of HEVA and PNEM for both one-time assay and (repeated) NDA Fingerprint verification scenarios. The findings presented in this report represent a significant step forward in the community’s understanding of the strengths and limitations of the PNEM and HEVA NDA methods, and the viability of the UCVS concept in front-end fuel cycle facilities. This experience will inform Phase II of the UCVS viability study, should the IAEA pursue it.« less

Authors:
 [1];  [2];  [3];  [4];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1333456
Report Number(s):
PNNL-25395
DN4001030; TRN: US1700765
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; 42 ENGINEERING; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; URANIUM HEXAFLUORIDE; VERIFICATION; URANIUM; CYLINDERS; ISOTOPE SEPARATION PLANTS; URANIUM 235; ENRICHMENT; FUEL FABRICATION PLANTS; MASS; PERFORMANCE; DEFECTS; DESIGN; EVALUATION; NONDESTRUCTIVE ANALYSIS; IMPLEMENTATION; IAEA SAFEGUARDS; SENSITIVITY; SIMULATION; IDENTIFICATION SYSTEMS; FEASIBILITY STUDIES

Citation Formats

Smith, Leon E., Miller, Karen A., Garner, James R., Branney, Sean, McDonald, Benjamin S., Webster, Jennifer B., Zalavadia, Mital A., Todd, Lindsay C., Kulisek, Jonathan A., Nordquist, Heather, Deshmukh, Nikhil S., and Stewart, Scott. Viability Study for an Unattended UF6 Cylinder Verification Station: Phase I Final Report. United States: N. p., 2016. Web. doi:10.2172/1333456.
Smith, Leon E., Miller, Karen A., Garner, James R., Branney, Sean, McDonald, Benjamin S., Webster, Jennifer B., Zalavadia, Mital A., Todd, Lindsay C., Kulisek, Jonathan A., Nordquist, Heather, Deshmukh, Nikhil S., & Stewart, Scott. Viability Study for an Unattended UF6 Cylinder Verification Station: Phase I Final Report. United States. doi:10.2172/1333456.
Smith, Leon E., Miller, Karen A., Garner, James R., Branney, Sean, McDonald, Benjamin S., Webster, Jennifer B., Zalavadia, Mital A., Todd, Lindsay C., Kulisek, Jonathan A., Nordquist, Heather, Deshmukh, Nikhil S., and Stewart, Scott. Tue . "Viability Study for an Unattended UF6 Cylinder Verification Station: Phase I Final Report". United States. doi:10.2172/1333456. https://www.osti.gov/servlets/purl/1333456.
@article{osti_1333456,
title = {Viability Study for an Unattended UF6 Cylinder Verification Station: Phase I Final Report},
author = {Smith, Leon E. and Miller, Karen A. and Garner, James R. and Branney, Sean and McDonald, Benjamin S. and Webster, Jennifer B. and Zalavadia, Mital A. and Todd, Lindsay C. and Kulisek, Jonathan A. and Nordquist, Heather and Deshmukh, Nikhil S. and Stewart, Scott},
abstractNote = {In recent years, the International Atomic Energy Agency (IAEA) has pursued innovative techniques and an integrated suite of safeguards measures to address the verification challenges posed by the front end of the nuclear fuel cycle. Among the unattended instruments currently being explored by the IAEA is an Unattended Cylinder Verification Station (UCVS) that could provide automated, independent verification of the declared relative enrichment, 235U mass, total uranium mass and identification for all declared UF6 cylinders in a facility (e.g., uranium enrichment plants and fuel fabrication plants). Under the auspices of the United States and European Commission Support Programs to the IAEA, a project was undertaken to assess the technical and practical viability of the UCVS concept. The US Support Program team consisted of Pacific Northwest National Laboratory (PNNL, lead), Los Alamos National Laboratory (LANL), Oak Ridge National Laboratory (ORNL) and Savanah River National Laboratory (SRNL). At the core of the viability study is a long-term field trial of a prototype UCVS system at a Westinghouse fuel fabrication facility. A key outcome of the study is a quantitative performance evaluation of two nondestructive assay (NDA) methods being considered for inclusion in a UCVS: Hybrid Enrichment Verification Array (HEVA), and Passive Neutron Enrichment Meter (PNEM). This report provides context for the UCVS concept and the field trial: potential UCVS implementation concepts at an enrichment facility; an overview of UCVS prototype design; field trial objectives and activities. Field trial results and interpretation are presented, with a focus on the performance of PNEM and HEVA for the assay of over 200 “typical” Type 30B cylinders, and the viability of an “NDA Fingerprint” concept as a high-fidelity means to periodically verify that the contents of a given cylinder are consistent with previous scans. A modeling study, combined with field-measured instrument uncertainties, provides an assessment of the partial-defect sensitivity of HEVA and PNEM for both one-time assay and (repeated) NDA Fingerprint verification scenarios. The findings presented in this report represent a significant step forward in the community’s understanding of the strengths and limitations of the PNEM and HEVA NDA methods, and the viability of the UCVS concept in front-end fuel cycle facilities. This experience will inform Phase II of the UCVS viability study, should the IAEA pursue it.},
doi = {10.2172/1333456},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {5}
}