ML20100C860
| ML20100C860 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 03/15/1985 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| (RDC-121(84)), NUDOCS 8503290292 | |
| Download: ML20100C860 (3) | |
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.v P.O. box 5000 - CLEVELAND. OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLDG. - 55 PUBLIC SoUARE Serving The Best Location in the Nation MURRAY R. EDELMAN p10stIY ROGOM VICE PRESloENT NUCLEAR i p g g
March 15, 1985 39_
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y3.,p%s-s Mr. James G. Keppler
[ FILE 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 i
Docket Nos. 50-440; 50-441 Borg-Warner 20-Inch Gate Valve [RDC 121(84)]
Dear Mr. Keppler:
This letter serves as our second interim report pursuant to 10CFR50.55(e) relative to operation of Borg-Warner gate valves.
Mr. Frank Jablonski of your office was notified on October 31, 1984, by Mr. R. G. Golt of The Cleveland Electric Illuminating Company (CEI) that this problem was being evaluated per our Deviation Analysis Report 213.
Description of Deficiency A 20-inch ASME Class 1 gate valve (IN27-F560A) manufactured by Borg-Warner Fluid Controls (BWFC) would not open completely. Inspection revealed that gouging of a gate guide by the sliding gate caused the failure. Contributing causes for the failure were determined to be as follows:
Misalignment of the welded-in guides due to inadequate welding during manufacture.
The orientation of the valve (stem horizontal) in horizontal piping such that the lower guide carries the entire weight of the gate.
A " rolling" action of the gate caused by guide misalignment and valve orientation.
8503290292 850315 PDR ADOCK 05000440 S
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ik Mr. James G. K:ppist March 15, 1985 Another valve (IN27-F560B) of ' identical type, size, and installation was cycled twenty. times and inspected..The gate guides of IN27-F560B were found to be cast in' place as part of the valve body. Although minor gate rolling was detected, there was no damage to the guide rails and no further evaluation will be made on valves with cast guides. BWFC subsequently reported the alignment and welding problems in a 10CFR21 notification to the NRC on November-21, 1984.. As a result of their internal review, BWFC contends that the guide alignment problem could only occur in 20-inch valves with welded-in guides.
Subsequently, another adverse condition was discovered and documented on Nonconformance Report NTS-0283.. Valve 1E12-F072A was fully opened to the backseat position but could not be closed again. Inspection revealed that the gate had disengaged from its guides. This has been attributed to inadequate guide length complicated by valve orientation (horizontal stem and piping).
Corrective Action CEI replaced.the misaligned guides in IN27-F560A. The guides were also replaced in IN27-F560B in the interest of long-term reliability. CEI is inspecting other Unit 120-inch BWFC gate valves with welded guides. To date, IE12-F008, IE12-F009, and IB21-F0065B have been examined with no guide alignment deficiencies noted. In the case of IB21-F0065B, CEI has increased guide to body weld size because of design differential pressure. The remaining Unit 1 20-inch valves will be evaluated in the near future.
In order to provide additional assurance that guide alignment problems are limited to the 20-inch valves, CEI will examine other BWFC gate valves of various sizes. The additional valves are not installed and shall be one each of the following:
Bill of Material Size BWFC Part #
RNN 217 4"
81110 RNN 221 6"
81120 RNN 223 8"
81130 RNN 224 12" 81330-1 RNN 226 18" 81150 RNN 227 24" 81170 RON 207.
10" 80990 RON 217 2-1/2" 85030 The IE12-F072A valve (gate disengaged from guides) is currently being fitted with longer guides. CE1 is compiling a list of all Borg-Warner gate valves mounted with the stem in the horizontal position and will evaluate whether corrective action is warranted.
C Mr. J:mes C. Kspp10r March 15, 1985 i
We anticipate that all activities referenced in this report will be completed by May 1,1985, and that our final report will be submitted by May 15, 1985.
Please call if there are additional questions.
Sincerely, h
Murray R. Edelman Vice President Nuclear Group MRE:nb DW165/Y/3 cc: Mr. J. A. Grobe USNRC, Site Office Mr. D. E. Keating USNRC, Site Office Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D.C.
20555 Records Center, SEE-IN Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 wm-=
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