ML20214V289
| ML20214V289 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Mcguire, Catawba, McGuire, 05000000 |
| Issue date: | 11/20/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-85-003, IEB-85-3, NUDOCS 8612090608 | |
| Download: ML20214V289 (2) | |
Text
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-4 DUKE POWER GOMPANY P.O. HOX 33180 CHAMLOTTE, N.C. 28242 "E;.""
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November 20, 1986 Dr..J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta St. NW, Suite 2900 Atlanta, Georgia 30323
Subject:
McGuire Nuclear Station Catawba Nuclear Station Oconee Nuclear Station Docket Nos. 50-369, -370; 50-413, -414; 50-269, -270; -287' Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Gettings (NRC/0IE Bulletin 85-03)
Dear Dr. Grace:
By Mr. J.M. Taylor's (NRC/0IE) letter dated November 15, 1985 the NRC issued Bulletin 85-03 concerning motor-operated valve (MOV) common mode failures during plant transients due to improper switch settings. The purpose of this bulletin was to request licensees to develop and implement a program to ensure that switch settings on certain safety-related motor-operated valves are selected, set and maintained correctly to accommodate the maximum differential pressures expected on these valves during both normal and abnormal events within the design basis.
Toward this end, on May 16, 1986 Duke submitted a report (as directed by the bulletin) outlining our plan to accomplish the requested program for the McGuire, Catawba, and Oconee Nuclear Stations by November 15, 1987.
Although Duke Power Company has, in the past, generally met vendor, industry and code requirements, an investigation begun late in 1985 of Duke's motor operated valves (prompted.by Bulletin 85-03 which limited the scope of investigation only to the safety injection and the emergency feedwater systems) has shown that cdditional measures are necessary to ensure MOV operability. The results of the Bulletin 85-03 investigation have been conveyed to the NRC at the followup meeting to the NRC's Safety System Functional Inspection at Oconee (reference my October 1,1986 letter to Mr. J.M. Taylor), at the McGuire Enforcement Conference held in Atlanta on October 10, 1986 relative to NRC/0IE Inspection Report Nos.
50-369/86-21 and 50-370/86-21, and in various discussions related to generic problems applicable to McGuire, Oconee, and Catawba Stations as detailed in NRC/0IE Information Notice 86-93.
Accordingly, Duke Power Company committed to cxpand the scope of our original MOV improvement program (as described in the May 16, 1986 response) from just the bulletin MOV's to all nuclear safety-related MOV's that are required to be tested for operational readiness for all three ctations.
8612090608 861120 PDR ADOCK 05000269 G
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- t h*.Dr. J. Nelson Grace O
November 20, 1986 Page 2 The expanded program scope to include verification of operability on all safety-related MOV's will require a revision to the implementation plan for each unit. Duke is committed to performing sufficient design reviews, field testing, and station modifications (if required) to ensure that all safety-related MOV's will perform their intended function. Duke is currently in the process of assessing the actions, maintenance priorities and resources required to meet this committent, and will submit a schedule for completion of the operability verification on each unit by February 2,1987. Should there be any questions concerning this matter, please advise.
Very truly yours, f, ~n s
7 Hal B. Tucker PBN/35/j gm xc:
Mr. Darl Hood Mr. J.C. Bryant Office of Nuclear Reactor Regulation NRC Resident Inspector U.S. Nuclear Regulatory Commission Oconee Nuclear Station Washington, D.C.
205$5 Mr. W.T. Orders Document Control Desk NRC Resident Inspector U.S. Nuclear Regulatory Commission McGuire Nuclear Station Washington, D.C.
20555 Mr. T.A. Lordi, Manager Westinghouse Owners Group c/o Westinghouse Electric Corporation Nuclear Services Integration Division Box 2728 Pittsburgh, PA 15230-2728 Mr. R.W. Ganthner, Manager B&W Owners Group Engineering Services e/o Babcock and Wilcox Company Nuclear Power Division 3315 Old Forest Road P.O. Box 10935 Lynchburg, VA 24506-0935