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February 14, 2003 Dr. William D. Travers
Dear Dr. Travers: During the 499th meeting of the Advisory Committee
on Reactor Safeguards on February 6-8, 2003, we met with representatives of the
NRC's Office of Nuclear Regulatory Research to discuss the Draft Final Regulatory
Guide DG-1077, "Guidelines for Environmental Qualification of Microprocessor-Based
Equipment Important to Safety in Nuclear Power Plants." We also had the benefit
of the documents referenced. RECOMMENDATION DG-1077 provides appropriate guidance for environmental qualification of microprocessor-based equipment and should be issued. DISCUSSION DG-1077 endorses the use of the Institute of Electrical and Electronics Engineers Standard 323-1983 (as reaffirmed in 1996) or the International Electrotechnical Commission Standard 60780, with some enhancements and exceptions, as well as RG 1.89 and RG 1.180. The staff used NUREG/CR-6741 as the basis for the guidelines for environmental qualification of microprocessor-based equipment. Both NUREG/CR-6741 and DG-1077 recognize the important differences in the degradation and failure modes associated with microprocessor-based equipment and provide specific guidance to properly resolve issues in the environmental qualification of this equipment for use in nuclear power plants. The guidance recognizes the international market for replacement, and new instrumentation and controls, and appropriately incorporates international standards.
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