ML19305D774

Final Deficiency Rept Re Failure of Thrust Bearing on Diesel Generator Mfg by Colt Industries.Forwards Colt Industries Regarding Successful Completion of Shop Tests

ML19305D774
Person / Time
Site:	Summer
Issue date:	04/08/1980
From:	Crews E SOUTH CAROLINA ELECTRIC & GAS CO.
To:
References
NUDOCS 8004150501
Download: ML19305D774 (2)

Text

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e SOUTH CAROLINA ELECTRIC a gas COMPANY eost orrice son,e4 COLUMelA, SOUTH CAROUNA 29218 E.H. Ca rws, J n.

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April 8, 1980 cm...

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Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Connission a

Region II, Suite 3100 101 Marietta Street, N. W.

Atlanta: Georgia 20303

Subject:

Virgil C. Summer Nuclear Station Reportable Significant Deficiency, Colt Diesel Generators Nuclear Eng. File 3.1051

Dear Mr. O'Reilly:

In our March 5, 1980, letter to you South Carolina Electric and Gas Company provided an interim report on the failure of a thrust bearing on one of our diesel generators manufactured by Colt Industries. In followup to the question regarding successful completion of shop tests, the attached copy of a letter from Colt Industries to the NRC dated March 5, 1980, pro-vides an acceptable answer.

Since all repairs have been made.and questions resolved, this letter is considered the final report on thi:

item. If you require additional information, please let us know.

e culy yours, i

E. H. Crews, Jr.

RBC:EHCJr:md CC: Office of Inspection and Enforcement Washington, D. C.

i So/ 7 5 6i/i 8004150 $O

9 BCC: Messrs.

V. C., Summer E. H. Crews, Jr.

H. T. Babb J. Skolds

0. S. Bradham H. Radin NPCF/Dixon File D. M. Moore M. B. Whitaker, Jr.

A. A. Smith l

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R STERED Nk i: <;,

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RETURN RECEIPT REQUESTED 1

v Original & 3 copies.

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'- :.::im Of fice of InspecEton' &' Enforcement"Y'"-

U. S. Nuclear Regulatory Cor. mission 799 Roosevelt Road

_ Glen Ellyn, Ill.- 60137 f7

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. Attention:' Mr. James G. Keppler, Director, Region III

Subject:

Colt Industries-Fairbanks ' Morse Engine Division 4~. ; ~ S '.Emergenc.y Diesel Generators South Carolina Electric & Gas Co.-Sunmer Station

, January 14,1980 Part 21 Report-Failed Engine Thrust Bearing Supplement No. I

'SHUPPS-Callaway No. 1 1.. -

~

Gentlemen:

[',,

We have completed our inspections of the crankshaft thrust bearings on the two PC-2.5 generator sets at Union Electric's, Callaway Unit One. The plugs were properly installed in both units. Both units are free of the reported potential defect.

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Our earlier report indicated we were evaluating the design to permit explanation of the apparent satisfactory operation of the South Carolina Electric & Gas Unit during shop tests in our factory prior to shipment followed by failure during start-up at the Summer site. These units.are equipped with large capacity external thrust bearings to permit satisfac-tory operation under high fore and aft forces resulting from a seismic event. The actual load imposed on these bearings during shop tests is 3

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very low and perhaps zero. We have concluded that the bearing was lightly loaded during shop tests, did not fail during such tests, but subsequently failed.

_ We will be inspecting other shipped units prior to initial operation and will report,the results of those inspections as they are made.

A copy of this report is being fonvarded to.the utilities involved.

e Very truly yours, i

V h({

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