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Information Notice No. 91-45: Possible Malfunction of Westinghouse ARD, BFD, and NBFD Relays, and A200 DC and DPC 250 Magnetic Contactors
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION WASHINGTON, D.C. 20555 July 5, 1991 Information Notice No. 91-45: POSSIBLE MALFUNCTION OF WESTINGHOUSE ARD, BFD, AND NBFD RELAYS, AND A200 DC AND DPC 250 MAGNETIC CONTACTORS Addressees: All holders of operating licenses or construction permits for nuclear power reactors. Purpose: This information notice is intended to alert addressees and vendors of equipment used by the addressees to the possibility that Westinghouse ARD, BFD, and NBFD relays and A200 DC and DPC 250 magnetic contactors could malfunction. These devices have been widely used in the design of systems for nuclear power plants which have Nuclear Steam Supply Systems supplied not only by Westinghouse but also by other vendors. It is expected that recipients will review the information for applicability to their facilities and consider actions, as appropriate, to avoid similar problems. However, suggestions contained in this information notice do not constitute NRC requirements; therefore, no specific action or written response is required. Description of Circumstances: On June 24, 1991, Westinghouse issued a 10 CFR Part 21 report (Attachment 1) concerning the potential for certain Westinghouse supplied products to malfunction due to an epoxy compound becoming semi-fluid when the coil is energized for extended periods. The components covered by the Westinghouse report are used in safety-related applications within equipment manufactured by Westinghouse and other vendors. The type of malfunction mentioned may degrade safety by disabling or delaying a function. The NRC will be discussing the adequacy of the recommendations in Attachment 1 with Westinghouse and, as appropriate, with licensees. 9107030356 . IN 91-45 July 5, 1991 Page 2 of 2 This information notice requires no specific action or written response. If you have any questions about the information in this notice, please contact one of the technical contacts listed below or the appropriate NRR project manager. Charles E. Rossi, Director Division of Operational Events Assessment Office of Nuclear Reactor Regulation Technical Contacts: Nancy E. Campbell, NRR (301) 492-0836 Paul Loeser, NRR (301) 492-0825 Attachments: 1. Westinghouse Part 21 Report 2. List of Recently Issued NRC Information Notices .
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