ML20108C811
| ML20108C811 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 09/27/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8411190083 | |
| Download: ML20108C811 (3) | |
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4 DUKE POWER GOMPANY' P.O. DOX 33189 '
CHARLOTTE, N.C. 28242 HAL B. TUCKER
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(704) 373-6531 n
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September 27, 1984 i
1 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission
. Region II
'101 Marietta' Street, NW, Suite 2900 Atlanta, Georgia 30303
'Re: Catawba Nuclear Station Units 1 and 2 Docket Nos. 50-413 and 50-414-Significant Deficiency 413-414/84-19
Dear Mr. O'Reilly:
Please find attached a final report on the subject Deficiency which was identified in my letter of July 27, 1984. All corrective action has been completed for the Unit 1 diesels.
Very truly yours, 7 "'
Hal B. Tucker LTP/mjf Attachment cc: Director Mr. Robert Guild, Esq.
Office of Inspection and Enforcement Attorney-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 2135 Devine Street Columbia, South Carolina 29205 INPO Records Center Suite 1500
'1100 circle 75 Parkway Atlanta, Georgia 30339 i
8411190083 840927 BFFICIAb COPY PDR ADOCK 05000413
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Final Report Catawba Nuclear' Station Report p uhpr:- SD 413-414/84-19.
Rapnrt'Date:
' September 27, 1984 Flacility: Catawba Nuclear Station, Units 1&2.
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 Utterback, and Mr R D Carroll of Duke Power Canpany, Charlotte, NC 28242.
Supplier and/or Caponent: 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 anc' 2B.
Description of Deficiency: During an inspection, following an extended operational test of the Catawba diesel generator IA, 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.
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, _J Preliminary. studies indicate that'the. cracks are due to installation tolerance between the dowels, bushings, and the pedestal which lead to excessive interference.
Analysis of Safety Implication: Results of the failure analysis of the cracked subcovers confirm the two cracked subcovers resulted frm a' misaligned dowel-pin in one case and an oversized dowel pin in'a second case. In addition, no
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evidence of fatigue cracking was observed in either case.
Neither situation would, nor did,-affect the diesels operability or power output; therefore, this item is evaluated not to be reportable.
Correstive Action: Ihe cracked subcovers have been replaced and the installation procedures have been revised to reduce the future possibility of excessive inter-ferences or misalignments.
All of the unit I subcovers have been irmpecud for additional cracks, and the unit 2 subcovers will be inspected for cracks by August, 1985.
No further action is required regarding this matter.
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