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Response of Rubber Insulation Materials to Monoenergetic Electron Irradiations (NUREG/CR-3532)
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Publication Information
W. H. Buckalew, F. J. Wyant, G. J. Lockwood
Sandia National Laboratories
Albuquerque, New Mexico 87185
Operated by Sandia Corporation
for the
U.S. Department of Energy
Prepared for the Electrical Engineering Branch Division of Engineering Technology
Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission
Washington, DC 20555
Under Interagency Agreement DOE 40-550-75
NRC FIN No. A-1051
Availability
Notice
Abstract
The electron charge disposition in ethylene-propylene rubber
(EPR) insulation specimens irradiated with monoenergetic electrons
has been investigated. Studied was charge. disposition in slab and cylindrical (cable) geometries. For each geometry,
charge behavior was observed as a function of environment, electron energy, and surface termination. Under certain conditions
charge *was accumulated and spontaneous breakdown did
occur during irradiation in the vacuum environment; however, no
evidence of breakdown was observed during ambient air exposures.
Based on these experiments, it is concluded that electron charge buildup and breakdown is not apt to occur in EPR rubber insulation
exposed to electrons from a LOCA radiation environment
provided that the insulation is in contact with an ionized
medium. The results can probably be applied to other organics and it appears that the LOCA beta spectra need not be precisely
duplicated in insulation-radiation qualification tests.
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