ML20087B431

Fourth Interim & Part 21 Repts,Item 101 Re Defective Governor Drive Coupling Supplied by Transamerica Delaval. Initially Reported on 820909.Couplings to Be Replaced.Final Rept by 840525

ML20087B431
Person / Time
Site:	Harris
Issue date:	02/24/1984
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
CON-NRC-185, REF-PT21-84-186-000 101, PT21-84-186, PT21-84-186-000, NUDOCS 8403090082
Download: ML20087B431 (4)

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Carolina Power & Light Company fMN4" P. O. Box 101, New Hill, N. C. 27562 February 24,19 Mr.' James P. O'Reilly NRC-185 United States Nuclear Regulatory Commission Region H 101 Marietta Street, Northwest (Suite 2900)

Atlanta, Georgia 30303 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 DEFECTIVE GOVERNOR DRIVE COUPLING PURCHASE ORDER NY-435079, ITEM 101

Dear Mr. O'Reilly:

Attached is our fourth interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21, on September 9,1982. CP&Lis pursuing thic matter, and it is currently projected that corrective action and submission of the final report will be accomplished by May 25,1984.

Thank you for your consideration in this matter.

Yours very truly,

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R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/bk Attachment ec:

Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)

Mr. R. C. DeYoung (NRC)

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OFFICIAL COPY 1627 8403070082 840224 l

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.. CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 q

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FOURTH INTERIM REPORT FEBRUARY 21, 1984 DEFECTIVE GOVERNOR DRIVE COUPLING.

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-ITEM 101

-(DDR 1056)

' REPORTABLE UNDER 10CFR50.55(e).AND 10CFR21 as;;

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SUBJECT:

'Shearon Harris Nuclear Power Plant - Unit No. 1

-10CFR50.55(e) and 10CFR21 Reportable Deficiency.

Defective governor drive coupling installed in the emergency diesel engine-generator sets _under Purchase

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Order NY-435079 from Transamerica DeLaval, Inc.

- ITEM:

Isoprene governor drive coupling located in the engine's gear case. Part No. AK-007-000-ISUPPLIED BY:

Transamerica DeLaval Inc.,_0akland.. California The governor drive coupling is manufactured by Koppers Co., Inc.

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NATURE OF TransamebicaDeLaval,Inc.shippedtwodieselenginesto

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' DEFICIENCY:

-the Shearon' Harris site on Purchase Order NY-435079 in Mayland' June, 1981.-

In' June, 1982, Transamerica DeLaval notified CP&L that

.the engines contain an isoprene governor drive coupling and there is a potential problem since the material, isoprene,His designed for atmospheric use and it is not suitable for'use in the high temperture, oil atmosphere encountered in the engine's gear case, f

lDATE PROBLEM

-0CCURRED:-

Refer to section above.

'DATE PROBLEM-REPORTED:

September 9,- 1982 - CP&L (N. J. Chiangi) notified the NRC Region-II (A.;Hardin) that this item was reportable under

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10CFR50.55(e) and 10CFR21.

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SCOPE OF PROBLEM:

The problem involves the two diesel engines shipped on Purchase' Order NY-435079. These engines have isoprene governor drive couplings installed..

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' SAFETY:

IMPLICATION:

The diesel-generator' sets supply power to the ESF buses

in case of a loss of both normal on-site and off-site power sources.

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In the high temperature, oil atmosphere encountered in the engine's gear case, the rubber deteriorates rapidly and ultimately fails. While the coupling is " fail safe" and will mechanically lock up when the element fails, sufficient frequency instability could be induced that

'would result in the engine's cripping off line, thereby affecting engine availabiltiy.

REASON DEFFICIENCY IS REPORTBLE

If left' uncorrected, failure of'the governor drive coupling could result in the loss of the emergency on-site AC power supply.

CORRECTIVE ACTION:

The isoprene governor drive coupling will be replaced in accordance with the instructions attached to the Traneamerica DeLaval to CP&L letter dated August 18, 1982.- This work requires capability to "bar" the engine over. The replacement parts have been received on site.

This modification has not been completed to date because work is still underway to complete the installation of

- the Diesel Engines.

-FINAL REPORT:

. A final report will be issued once the corrective action described above has been completed.

It is currently projected that the submittal date will be May 25, 1984.

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