ML20217Q696

Special Rept 97-001:on 970730,valid Failure of Div 1 EDG Occurred Due to Jacket Water Leak.Faulty Lube Oil Temp Switch Was Replaced & Jacket Water Leak Was Repaired

ML20217Q696
Person / Time
Site:	Grand Gulf
Issue date:	08/26/1997
From:	Hughey W ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
97-001, 97-1, GNRO-97-00082, GNRO-97-82, NUDOCS 9709030320
Download: ML20217Q696 (2)

Text

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Port Gbson MS 39150 j

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, W.K.Hughey  ;

_ August 26, 1997- lff;bo ny,uaw l

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U. S. Nuclear Regulatory Commission Mail Station P1-37 j- - Washington, D.C. 20555 i Attention

Document Control Desk

Subject:

~ Grand Gulf Nuclear Station t Docket No. 50416 License No. NPF-29 Special L ; port 97-001

, Valid Failure of Division i Emergency Diesel Generator Due l to a Jacket Water Leak i

GNRO-97/00082 Gentlemen:

l On July 30,1997, operators were performing a routine monthly surveillance run on i the Division 11 Emergency Diesel Generator (EDG). During the surveillance run,

the EDG tripped on indication of high lube oil temperature. The EDG was taken

out of service to trouble shoot the cause of the trip. The cause of the trip was

determined to be a failed lube oil temperature switch. The high lube oil temperature trip is bypassed in an emergency, therefore, this trip was an invalid

failure of the Division 1 EDG, d

I During the time that the EDG was out of service to replace the faulty lube oil

'_ temperature switch a Jacket water leak developed at a Dresser coupling. It was I - determined that the Jacket water leak was of such a degree that the EDG could not -

have completed its design seven day run without operator action. As a result, the

!- Jacket water leak was declared a valid failure of the Division 1 EDG.-

- The faulty tube oil temperature switch was replaced and the Jacket water leak repaired. The Division i EDG monthly surveillance was run and successfully completed. The valid failure of the Division 1 EDG was the first valid failure in the i- -

last 25 valid tests and the third valid failure in the last 100 valid tests. The EDG 2 was unavailable for 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> and 47 minutes. This unavailablity time does not include time associated with routine divisional maintenance.

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9709030320 970826 9

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August 26, 1997 ONRO-97/00082 Page 2 of 3 These failures, an invalid failure (trip due to a failed lube oil temperature switch) followed by a valid failure Qacket water leak), are being reported pursuant to Grand Gulf Technical Requirements Manual section 7.7.2.2 Yours trul ,

WKH/JEO YQ cc: Mr. J. L Dixon-Herrity, GGNS Senior Resident (w/a)

Mr. N. S. Reynolds (w/a)

Mr. L. J. Smith (Wise Carter) (w/c)

Mr. H. L Thomas (w/o)

Mr. J. W. Yelverton (w/a)

- Mr. J. N. Donahaw, Project Manager (w/2)

Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mall Stop 13H3 Washington, D. C. 20555 /(-

Mr. E. W. Merschoff (w/a)

Regional Administrator U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011

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