Closeout of IE Bulletin 79-25: failures of Westinghouse BFD relays in safety-related systems

Technical Report · Mon Apr 01 04:00:00 EST 1985

OSTI ID:5706481

Foley, W J; Dean, R S; Hennick, A

Robinson 2 submitted LER 78-29 December 19, 1978 to report sticking of a normally energized Westinghouse BFD relay. After reviewing this problem, Westinghouse issued Service Letter TS-E-412 to recommend that BFD relays in safety-related systems be replaced with later NBFD relays, Robinson 2 found some with marginal or unsatisfactory armature overtravel. Because of this new problem, Westinghouse issued Technical Bulletin NSD-TB-79-05 to recommend prompt checking of certain models of NBFD relays and returning those with inadequate overtravel for rework or replacement. IE Bulletin 79-25, with extracts of the Westinghouse service letter and technical bulletin enclosed, was issued November 2, 1979 to require responses and specific actions by all licensees and holders of construction permits with respect to BFD and NBFD relays in safety-related systems. Evaluation of utility responses and NRC/IE inspection reports indicates that the bulletin can be closed out for 121 (94%) of the 129 current facilities on the basis of specific criteria. Proposed followup items for the remaining 8 facilities are presented in Appendix C for use by NRC/IE. Because followup of corrective action is ensured, IE Bulletin 79-25 is considered closed.

• Research Organization: Parameter, Inc., Elm Grove, WI (USA)
• OSTI ID: 5706481
• Report Number(s): NUREG/CR-4004; ON: TI85901361
• Country of Publication: United States
• Language: English

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