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Title: Eddy-Current Testing of Welded Stainless Steel Storage Containers to Verify Integrity and Identity

Abstract

An eddy-current scanning system is being developed to allow the International Atomic Energy Agency (IAEA) to verify the integrity of nuclear material storage containers. Such a system is necessary to detect attempts to remove material from the containers in facilities where continuous surveillance of the containers is not practical. Initial tests have shown that the eddy-current system is also capable of verifying the identity of each container using the electromagnetic signature of its welds. The DOE-3013 containers proposed for use in some US facilities are made of an austenitic stainless steel alloy, which is nonmagnetic in its normal condition. When the material is cold worked by forming or by local stresses experienced in welding, it loses its austenitic grain structure and its magnetic permeability increases. This change in magnetic permeability can be measured using an eddy-current probe specifically designed for this purpose. Initial tests have shown that variations of magnetic permeability and material conductivity in and around welds can be detected, and form a pattern unique to the container. The changes in conductivity that are present around a mechanically inserted plug can also be detected. Further development of the system is currently underway to adapt the system to verifying themore » integrity and identity of sealable, tamper-indicating enclosures designed to prevent unauthorized access to measurement equipment used to verify international agreements.« less

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
9588
Report Number(s):
SAND99-1829C
TRN: US0103164
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 40th Annual Meeting of the Institute of Nuclear Materials Management, Phoenix, AZ (US), 07/26/1999--07/29/1999; Other Information: PBD: 20 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; EDDY CURRENT TESTING; WELDED JOINTS; CONTAINERS; INTERNATIONAL AGREEMENTS; MAGNETIC SUSCEPTIBILITY; NUCLEAR MATERIALS MANAGEMENT; STAINLESS STEELS; STORAGE; STRESSES; PATTERN RECOGNITION

Citation Formats

Tolk, Keith M, and Stoker, Gerald C. Eddy-Current Testing of Welded Stainless Steel Storage Containers to Verify Integrity and Identity. United States: N. p., 1999. Web.
Tolk, Keith M, & Stoker, Gerald C. Eddy-Current Testing of Welded Stainless Steel Storage Containers to Verify Integrity and Identity. United States.
Tolk, Keith M, and Stoker, Gerald C. Tue . "Eddy-Current Testing of Welded Stainless Steel Storage Containers to Verify Integrity and Identity". United States. https://www.osti.gov/servlets/purl/9588.
@article{osti_9588,
title = {Eddy-Current Testing of Welded Stainless Steel Storage Containers to Verify Integrity and Identity},
author = {Tolk, Keith M and Stoker, Gerald C},
abstractNote = {An eddy-current scanning system is being developed to allow the International Atomic Energy Agency (IAEA) to verify the integrity of nuclear material storage containers. Such a system is necessary to detect attempts to remove material from the containers in facilities where continuous surveillance of the containers is not practical. Initial tests have shown that the eddy-current system is also capable of verifying the identity of each container using the electromagnetic signature of its welds. The DOE-3013 containers proposed for use in some US facilities are made of an austenitic stainless steel alloy, which is nonmagnetic in its normal condition. When the material is cold worked by forming or by local stresses experienced in welding, it loses its austenitic grain structure and its magnetic permeability increases. This change in magnetic permeability can be measured using an eddy-current probe specifically designed for this purpose. Initial tests have shown that variations of magnetic permeability and material conductivity in and around welds can be detected, and form a pattern unique to the container. The changes in conductivity that are present around a mechanically inserted plug can also be detected. Further development of the system is currently underway to adapt the system to verifying the integrity and identity of sealable, tamper-indicating enclosures designed to prevent unauthorized access to measurement equipment used to verify international agreements.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}

Conference:
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