ML20094N871
| ML20094N871 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/27/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8408160429 | |
| Download: ML20094N871 (3) | |
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DUKE Powim Godmixv P.O. BOX G3180 OIIAHLOTTE, N.C. 28242 IIAL B. TUCKER TELEPHONE 7
49l J"."""""c"m July 27, 1984
/,7 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: Catawba Nuclear Station Units 1 and 2 Docket Nos. 50-413 and 50-414
Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.55e, ple me find attached a Significant Deficiency Report No. SD 413-414/84-19.
Very truly yours, G
-e A 8 i Hal B. Tucker LTP/rbs Attachment cc: Director Mr. Robert Guild, Esq.
Office of Inspection and Enforcement Attcrney-at-Law U. S. Nuclear Regulatory Commission P. O. Box 12097 Washington, D. C.
20555 Charleston, South Carolina 29412 NRC Resident Inspector Mr. Jesse L. Riley Catawba Nuclear Station Carolina Environmental Study Group 854 Henley Place Palmetto Alliance Charlotte, North Carolina 28207 21351 Devine Street Columbia, South Carolina 29205 INP0 Records Center Suite 1500 1100 circle 75 Parkway Atlanta, Georgia 30339 (W}/U' FAT.C M V B408160429 840727 DR ADOCK 05000
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Catawba Nuclear Station Depnrt p e r: SD 413-414/84-19 Dapnrt Date: - July 27, 1984 Flacility: Catawba Nuclear Station, Units 1&2s Identification of Deficiency:
'Iwo cast iron subcovers were found to have cracked in a pedestal where the intake rocker arm shaft is bolted to the subcover.
Initial Report:
On June 23, 1984, Mr Virgil Brownlee of the NRC Region II, Atlanta, Georgia, office was notified of this deficiency by Mr L M Coggins, Mr J M Lines, Mr T L dtterback, and Mr R D Carroll of Duke Power Company, Char-lotte, NC 28242.
Supplier and/or Omponent:
Transamerica Delaval, Inc. of Oakland, California, manufactured and supplied the subcovers that are installed in the four Catawba diesels which are designated 1A, 1B, 2A and 2B.
Description of Deficiency:
During an inspection, following an extended opera-tional test of the Catawba diesel generator 1A, two cast iron subcovers were found to have cracks in the pedestal where the intake rocker arm shaft is bolted to the subcover. Prior to the extended operation test, another subcover was found to have a piece of this pedestal missing.
None of these cracks affected the diesel operability.
Preliminary. studies indicate that the cracks are due to installation tolerance between the dowels, bushings, and the pedestal which lend to excessive inter- -
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ference and possibly fatigue cracking.
I Analysis of-Safety Is lication:
h ilure Analysis Associates has initiated a. failure analysis of the.subcover as part of the 'IDI Owners Group program.
Once the. failure analysis is cxxplete, the issue of Safety Implication will be addressed. 'Ihis is expected to be cmpleted by September 27, 1984.
h1=d.ive Action:
'Ihe cracked subcovers have been replaced and the installa-tion procedures have been revised to reduce the future possibility of excessive interferences and fatigue cracking.
Once the failure analysis is coupleted by Failure Analysis Associates on the subcovers, any further corrective action that is required will be made.
l A final report addressing the safety implication and any further corrective action will be subnitted by January 15, 1985.
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