Recent results of an experimental study on the impact of smoke on digital I and C equipment

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Description

A program to assess the impact of smoke on digital Instrumentation and Control (I and C) safety systems began in 1994, funded by the US Nuclear Regulatory Commission Office of Research. Digital I and C safety systems are likely replacements for today`s analog systems. The nuclear industry has little experience in qualifying digital electronics for critical systems, part of which is understanding system performance during plant fires. The results of tests evaluating the performance of digital circuits and chip technologies exposed to the various smoke and humidity conditions representative of cable fires are discussed. Tests results show that low to ... continued below

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18 p.

Creation Information

Tanaka, T.J. & Antonescu, C. October 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Tanaka, T.J. Sandia National Labs., Albuquerque, NM (United States). Accident and Consequence Analysis Dept.
  • Antonescu, C. Nuclear Regulatory Commission, Washington, DC (United States). Office of Nuclear Regulatory Research

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

A program to assess the impact of smoke on digital Instrumentation and Control (I and C) safety systems began in 1994, funded by the US Nuclear Regulatory Commission Office of Research. Digital I and C safety systems are likely replacements for today`s analog systems. The nuclear industry has little experience in qualifying digital electronics for critical systems, part of which is understanding system performance during plant fires. The results of tests evaluating the performance of digital circuits and chip technologies exposed to the various smoke and humidity conditions representative of cable fires are discussed. Tests results show that low to moderate smoke densities can cause intermittent failures of digital systems. Smoke increases leakage currents between biased contacts, leading to shorts. Chips with faster switching times, and thus higher output drive currents, are less sensitive to leakage currents and thus to smoke. Contact corrosion from acidic gases in smoke and inductance of stray capacitance are less important contributors to system upset. Transmission line coupling was increased because the smoke acted as a conductive layer between the lines. Permanent circuit damage was not obvious in the 24 hrs of circuit monitoring. Test results also show that polyurethane, parylene, and acrylic conformal coatings are more effective in protecting against smoke than epoxy or silicone. Common-sense mitigation measures are discussed. Unfortunately industry is a long way from standard tests for smoke exposure that capture the variations in smoke exposure possible in an actual fire.

Physical Description

18 p.

Notes

INIS; OSTI as DE98003337

Source

  • Water reactor safety information meeting, Washington, DC (United States), 23 Oct 1997

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  • Other: DE98003337
  • Report No.: SAND--97-2114C
  • Report No.: CONF-9710177--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 642718
  • Archival Resource Key: ark:/67531/metadc692146

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

Description Last Updated

  • May 23, 2016, 2:07 p.m.

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Tanaka, T.J. & Antonescu, C. Recent results of an experimental study on the impact of smoke on digital I and C equipment, article, October 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc692146/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.