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Investigation of Twenty-Foot Separation Distance as a Fire Protection Method as Specified in 10 CFR 50, Appendix R
(NUREG/CR-3192)
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Publication Information
Date Published: October 1983
Sandia National Laboratories Albuquerque, NM 87185
operated by Sandia Corporation
for the
US Department of Energy
Prepared for Division of Engineering Technology
Office of Nuclear Regulatory Research
US Nuclear Regulatory Commission
Washington, DC 20555
Under Memorandum of Understanding DOE 40-550-75
NRC FIN No. A1010
Availability
Notice
Abstract
A combined experimental/analytical program was conducted to examine the
adequacy of the 20-foot separation requirement, one of the requirements set forth
in Appendix R of 10 CFR 50 for the fire protection of redundant safety systems
that are necessary to achieve hot shutdown in nuclear power plants. Specifically,
Sections III.G.2.b and d of Appendix R require separation of the redundant safety
systems by a horizontal distance of more than 20 feet with no intervening
combustibles or fire hazards. Section III.G.2.b also requires installation of fire
detectors and an automatic fire suppression system within fire areas. The
experimental investigation consisted of six full-scale fire tests of unqualified and
qualified electrical cables separated by 20 feet with (1) no protection, (2)
protection with a ceramic fiber blanket and sheet metal covers on the cable trays,
and (3) protection with a fire protective coating. For the test conditions investigated, all unqualified cable electrically shortened while qualified cable was found to short only when left unprotected.
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