ML20138P505
| ML20138P505 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 10/09/1985 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| (FDC-121(84)), (RDC-121(84)), LER-DEFR-851009, PY-CEI-OIE-0117, PY-CEI-OIE-117, PY-VEI-OIE-117, NUDOCS 8511070206 | |
| Download: ML20138P505 (2) | |
Text
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THE CLEVELAND ELECTRIC ILLUMIN ATING C0MP ANY m
P.O. BOX 5000 - CLEVELAND OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLDG.
- 55 PUBLtC SOUARE Serving The Best Location in the Nation MURRAY R. EDELMAN VICE PRESIDENT NUCUAR October 9, 1985 PY-CEI/OIE 0117 L Mr. James G.
Keppler Regional Administrator, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE:
Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Borg-Warner Gate Valves
[RDC 121(84)]
Dear Mr. Keppler:
Our letter of August 19, 1985, detailed corrective action for Borg Warner gate valves determined subject to failure in various orientations (ref: PY-CEI/OIE 0054 L); this report indicated that both guides would be replaced in the RON-218 valves found subject to failure in vertical piping through exercising of a RON-207 valve in a similar orientation.
Contributing factors to the failure of the RON-207 valve during inspection / cycling were determined to be welded-in carbon steel guides and excessive gate / guide operating clearance which allowed the gate seizure phenomenon described in our previous letter.
Upon disassembly of the RON-218 valves for repair, it was dis-covered that these valves had guides casted as an integral body part, and that gate / guide operating clearance were significantly closer than in the RON-207 valve.
As this reduced clearance will serve to limit the gate inclination required to precipitate gate seizure, The Cleveland Electric Illuminating Company has decided not to replace the guides in these valves.
Gate sliding surface corners will be contoured instead as an added measure to preclude gate seizure.
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gDR mg DCT 11 1985
1 Mr. James G. Koppler Octobar 9, 1985 PY-CEI/OIE 0117 L This is our final report on this matter.
If there are any questions, please call.
Sincerely, i
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Murray t.
Edelman Vice President Nuclear Group MRE:sab cc:
Mr. J. A. Grobe USNRC, Site Office (SBB50)
Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission i
l Washington, D.C.
20555 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555 i
Records Center, SEE-IN Institute of Nuclear Power Operations 1190 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 I
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