An Assessment of Fire Vulnerability for Aged Electrical Relays (NUREG/CR-6220, SAND94-0769)

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Publication Information

Manuscript Completed: June 1994
Date Published: March 1995

Prepared by:
R.A. Vigil (SEA)
S.P. Nowlen (SNL)

Science and Engineering Associates, Inc. (SEA)
6100 Uptown Blvd, NE
Albuquerque, New Mexico 87110-0737

Under Contract to:
Sandia National Laboratories (SNL)
Albuquerque, New Mexico 87185-5800
Operated by Sandia Corporation

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code A1833

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Abstract

This report details testing to assess the impact of aging on the fire vulnerability of Agastat and General Electric relays. Both aged and unaged relays were tested. Aged relays were subjected to operational cycling under rated load and thermally aged for sixty days. All relays were exposed to one of three different fire temperature profiles in the Severe Combined Environments Test Chamber located at Sandia National Laboratories. The ability to operate properly in the given fire environment was monitored. Results for the aged and unaged relays were examined to determine the impact of aging on the relays' ability to sustain operation under the test conditions. Overall results indicated that the aged relays' performance was not significantly different from that of the unaged relays.