ML20100R384

Special Rept 96-001:on 960206,valid Failure of DG 2B Occurred Due to Low Lube Oil Pressure Trip.Dg Determined to Have Been Past Inoperable During Periods of Low Room Temp

ML20100R384
Person / Time
Site:	Mcguire
Issue date:	03/07/1996
From:	Mcmeekin T DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
96-001, 96-1, NUDOCS 9603120404
Download: ML20100R384 (3)

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, DukePwerCompany T.C McMa m j

7 McGuire Nuclear Generation Department

\\' ice hesident l

12700Hagen FerryRoad(MG011P)

(704)8754800 Huntersville,NC280784985 (104)8754809 Fax DUKEPOWER DATE:

March 7, 1996 l

U.S. Nuclear Regulatory Commission f

l Document Control Desk Washington, D.'C.

20555 i

Subject:

McGuire Nuclear Station, Unit 2 Special Report No.: 96-001 Problem Investigation Process No.:

2-M96-0331 i

Gentlemen:

i Attached for your information is Special Report 96-001 concerning a valid failure of Diesel Generator 2B due to a low lube oil pressure l

trip.

This event and past inoperability of the Emergency Diesel Generator 2B will be the subject of Licensee Event Report 370/96-002.

Very truly you s, i

i gaf T.C. McMeekin l

JWP/gts Attachment cc:

Mr.

S.D. Ebneter 1NPO Records Center Administrator, Region II Suite 1500 U.S. Nuclear Regulatory Commission 1100 Circle 75 Parkway l

101 Marietta St.,

NW, Suite 2900 Atlanta, GA 30339 Atlanta, GA 30323 Mr. Victor Nerses Mr. George Maxwell I

U.S.

Nuclear Regulatory Commission NRC Resident Inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station Washington, D.C.

20555 l

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120008 3

9603120404 960307

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PDR ADOCK 05000370 S

PDR l

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nas.w on nayweaa i

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bxc: B. L. Walsh (ECllC) o Z.

L. Taylor'(CNS)

'6.

A. Copp (EC050)

J. I. Glenn (MG02ME)

P.-R..Herran (MG0lVP)

C.

B. Davis (MG01CP)

J. E. Burchfield (ONS Reg Compliance)

G. H.

Savage (EC06E)

G. B. Swindlehurst (ECll-0842)

C. M..Misenheimer (EC08I)

R. F. Cole (EC05N)

J. M.

Frye (EC05N)

T. G. Becker'(PB02L).

P. M. Abraham (EC08I)

R. B. White (MG0lVP)

L. V. Wilkie (ONO3SR)

D.

P. Kimball (CN05SR)

K. L. Crane (MG0lRC)

R. N. Casler '(EC05N)

.NSRB Support Staff (EC05N) i i

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1 DUKE POWER COMPANY McGUIRE NUCLEAR STATION SAFETY REVIEW GROUP SPECIAL REPORT

.i 1

Diesel Generator Special Report due to a valid failure of Diesel Generator 2B on February 6,1996, as documented on Problem Investigation Report (PIP) 2-M96-0331.

Special Report No: 96-01 Date of Report:

March 7,19%

On February 6,1996, Diesel Generator 2B was being run for the monthly Tech Spec surveillance start and load test per IrT/2/A/4350/02B, Diesel Generator 2B Operability i

Test. The diesel generator tripped on low lube oil pressure 39 seconds after start l

initiation.

This was the second valid failure in the last 20 valid tests and the third valid failure in the last 100 valid tests of Diesel Generator 2B. On a unit basis, this was the fifth valid failure 4

i in the last 100 valid tests of Diesel Generators 2A and 2B. Surveillance testing increases to weekly frequency per the requirements of Technical Specification 4.8-1 (Diesel

{

Generator Test Schedule).

Investigation revealed that the low lube oil pressure trip was caused by the combination of inadequate impulse line design for the low lube oil pressure switches, air inleakage i

with insufficient venting of the impulse lines, and low room temperature. Diesel l

Generator 2B was determined to have been past inoperable during periods oflow room temperature. An immediate notification of past inoperability was made on March 6, 1996. Additional analysis is ongoing and will be reported in Licensee Event Report i

370/ % -02.

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