Active Time-Domain Reflectometry for Unattended Safeguards Systems: FY16 Report [report]

Jonathan R. Tedeschi, Leon E. Smith, Ryan C. Conrad, Gordan Gavric, Mital A. Zalavadia, Daniel T. Keller, Richard M. Pratt
2016 unpublished
ph: (865) 576-8401 fax: (865) 576-5728 email: Available to the public from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161 ph: (800) 553-6847 fax: (703) 605-6900 email: online ordering: This document was printed on recycled paper. Abstract The International Atomic Energy Agency (IAEA) continues to expand its use of unattended measurement systems.
more » ... asurement systems. An increasing number of systems and an expanding family of instruments create challenges in terms of deployment efficiency and the implementation of data authentication measures. Traditional data security measures, for example tamper-indicating (TI) conduit, are impractical for the long separation distances (often 100 meters or more) between unattended monitoring system (UMS) components. Pacific Northwest National Laboratory (PNNL) is studying the viability of active time-domain reflectometry (TDR) for the detection of cable tampering in unattended radiation detection systems. The instrument concept under investigation would allow for unmanned cable integrity measurements, remote surveillance reporting and locating of cable faults and/or tampers. This report describes PNNL's FY16 progress and includes: an overview of the TDR methods under investigation; description of the TDR evaluation testbed developed by PNNL; development and testing of advanced signal processing algorithms to extract weak signals from relatively high noise levels; and initial testing of a laboratory prototype intended for IAEA UMS applications and based on a commercially available TDR module. Preliminary viability findings and recommendations for the next stage of development and testing are provided. v We also very much appreciate Mitch Anderson, Brent Waddoups and Lucas Thomson from LiveWire for their technical support on the Mantis system.
doi:10.2172/1411941 fatcat:f6oe6tawerczvceojul37tf3ze