05000416/LER-1983-189, Updated LER 83-189/03X-1:on 831207 & 840201,breaker 152-1704 to Div 3 ESF Bus Tripped.Caused by Broken Current Limiter Resistor Socket for Breaker Position Indicating Light. Agastat Relay 7012 Replaced

Updated LER 83-189/03X-1:on 831207 & 840201,breaker 152-1704 to Div 3 ESF Bus Tripped.Caused by Broken Current Limiter Resistor Socket for Breaker Position Indicating Light. Agastat Relay 7012 Replaced

ML20087G433
Person / Time
Site:	Grand Gulf
Issue date:	03/12/1984
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-84--0139, AECM-84--139, LER-83-189-03X, LER-83-189-3X, NUDOCS 8403200017
Download: ML20087G433 (4)

LER-2083-189, Updated LER 83-189/03X-1:on 831207 & 840201,breaker 152-1704 to Div 3 ESF Bus Tripped.Caused by Broken Current Limiter Resistor Socket for Breaker Position Indicating Light. Agastat Relay 7012 Replaced

Event date:
Report date:
4162083189R00 - NRC Website

text

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i 1 21 s 1 41@ 80 7 SS St DocutT suummEm EVEuri0475 DATE EVENT DESCRIPTIOes Aaso Pm00AaLE coss5EQutseCES h W lun 12/7/93. breaker 152-1704 to the Division 3 ESF bus tricoed. The HPCSI o Idiesel aenerator attempted to start but immediately tripped. The cause__j g icould not be determined at the time. The failure was considered valid l

.t 151 land the testino frequency was increased. On 2-1-84, the di esel,, genera- l 0 6 l t or triD recurred (SR 84-oo5) and was attributed to a low lubo oil pres-1

'f_[O Isure sianal which is bvoassed in the emeraency mode. The failure is now !

[TF1 Konsidered invalid pursuant to position C.2.e.(2) of Rec. Guide 1.1o8. 1 OOE CoasPONENT CODE 5 CODE I El E l@ [_X_j@ [Z,J@ l El N I Gl I I Nl E lh Z@

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2 ling the trip coil to energize. The socket was accidentally broken duringj g la changing of the bulb. The D/G trip was caused by the f ailure of a timal y [ delay relay which allowed a premature low lube oil pressure signal. I 1 8 3 N ST  % POveER OTHER STATUS DeeCowesPF D4SCOVER, DESCRIPTION Q W@ l 010 j 0 h M j Q Alares Actuated l Ac nvity co'ETEwr "

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~ Supplementary Information to

LER 83-189/03 X-1 4

Mississippi Power & Light Company Grand Gulf-Nuclear Station Unit 1 Docket Nc, 50-416 Technical Specification Involved: ~3.8.1.2 Reported Under Technical Specification:- 6.9,' '3.b:

' Event Narrative:

On December 7,1983, at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> breaker 152-1704 from ESF transformer 12 to the. Division 3 bus tripped. The.HPCS diesel' generator attempted to start but immediately tripped. The'HPCS' diesel generator was then declared inoperable..

No Limiting Condition for Operation (LCO) was entered as the HPCS system was j not required to bc. operable.

The cause of the breaker trip was due to a broken current limiter resistor

, socket for the breaker position indicating light. Thel socket shorted causing the trip coil fo; energize. The socket.was accidentally broken during a i changing of the bulb.

An extensive investigation into the diesel generator' trip failed.to identif'y

! the cause. Therefore, due to the undetermined cause of a failure to start

from a bonafide automatic start signal, per Regulatory Guide.l.108'C.2.e.(1),

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- the event was considered a valid failure and the test frequency-was increased to 3 days.

. On February 1, 1984, the HPCS diesel generator tripped again. The investiga-tion revealed that aL time ' delay rel' ay required to.-be ser i at' 60 seconds 'had drifted to approximately 6.5 seconds and allowed a premature. lube oil pressure trip. -The cause/of.the setpointichange'was due to failure of'the seals in the

l. pneumatic relay.' ? This event was ' reported in -Special Report' 84-005/0.

1-The relay. AgastatTModel No.' 7012, was: replaced;withian identical ~ component and will'be-calibrated-onlan 18-month' frequency..

4 4

Both trips.arefattributed tofthe low lube oil pressure trip which'is bypassed. -

in the LOCAre mergency mode. Therefore'the trips 1are considered invalid'

! = pursuant to Position C.2.e (2)1of Regulatory Guide}1.108.(-The number of i

current.' valid-failures is one'infthe~1ast 100. *ThisTis submitted:as a'finali '

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/ P MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. BOX 1840. J ACK S O N. MIS SIS SIP PI 3 9 2 05 34 gg ts AID : Q,2rch 12, 1984 NUCLEAR PRODUCTICN DEPAR'4ENT U.S. Nuclear Regulator; Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator .

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File: 0260/L-835.0 Update Report - Breaker 152-1704 to the Division 3 ESF Bus Tripped -

HPCS Diesel Generator Failed to Start LER 83-189/03 X-1 AECM-84/0139 On December 7, 1983, at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />, breaker 152-1704 from ESF transformer 12 to the Division 3 bus tripped. The HPCS diesel generator attemNed to start but immediately tripped. The HPCS diesel generator was then declared inoperable. Since the HPCS system was not required to be operable, a Limiting Condition for Operation was not entered. The event was reported pursuant to Technical Specification 6.9.1.13.b.

The cause of the HPCS diesel generator trip has been determined to be due to the failure of a time delay relay which allowed a premature low lube oil pressure signal. Therefore, since the cause of the failure to start has been determined and the low lube oil pressure trip is bypassed in the LOCA emergency mode, the failure is now considered ..n invalid failure pursuant to Regulatory Position C.2.e(2) of Regulatory Guide 1.108. This is a final report. Attached is LER 83-189/03 X-1 with Supplementary Information.

Yours truly,

~

' p' l L. F. Dale Q' ,

l Manager of Nuclear Services )

1 EBS/SHH:rg Attachment '

cc: See text page OFFICIAL COPY; ZZz L Member Middle South Utilities System llg

AECM-84/0139 MICISSIPPI POWER Q LIGHT COMPANY Page 2 1

cc: Mr. J. B. Richard (w/a) j Mr. R. B. McGehee (w/o) '

Mr. T. B. Conner (w/o)

Mr. G. B. Taylor (w/o)

Mr. Richard C. DeYoung, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Document Control Desk (w/a)

U. S. Nuclear Regulatory Commission Washington, D. C. 20555 1