ML20084E055

AO 50-237/75-18:on 750319,diesel Generator Failed to Come Up to Voltage During Testing.Caused by Dirty Contacts on Vs Relay in Field Flashing Circuit of Diesel Generator.Contacts Cleaned & Started Successfully

ML20084E055
Person / Time
Site:	Dresden
Issue date:	03/27/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
197-75, 3194, AO-50-237-75-18, NUDOCS 8304130579
Download: ML20084E055 (4)

Text

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. Address Heply to: Post Office Box 767 Chicago. Ilknois 60690 BBS Ltr. #197-75 Dresden nuoloar Power Station R. R. #1 Morris, Illinois 60450 . _ . _

March 27, 1975

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/ s Mr. Jamon G. Kepplor, Regional Director Directorato of Regulatory Operation-Region III

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Glen Ellyn, Illinoin 60137 x \',

M SUBJIIT: REPORT OF AFMORMAL OCCURRECR PER SECTION 6.6, A 0F TIE TFr1NICAi, SPFIIPICATIC'!S UNIT 2 DIF3EL GFNERATOR FAILED TO CO'S UP TO VOLTAGE

References:

1) Regulatory Guide 1.16 Rev. 1 Appendix A

2) Notification of Region III of U. S. Nuclear Regulatory Comission Telephono: P. Johnson, Mr.rch 21, 1975 Telegrua J. Koppler, March 21, 1975 f/ 1,evcor 1 rom d. u. br,epuencon to J. G. Keppler, Roport nuxbcr 50-237/1975-16 Report Numbers 50-237/1975-18 Roport Date: March 27, 1975 Occurrence Dates March 19,1975 Facility: Dresden Nuclear Power Station, Morris, Illinois IDTMPIFICATION OF OCCURRDICE The Unit 2 diecol generator failed to como up to voltago whilo being tested for a previous start failure problem.

CONDITIC'IS PRIOR TO 000URRH!OE Unit 2 va: in the cold shutdoun codo during an extended refueling outago.

The diescl generator van being tested to determine the courco of a starting problem and declared out of service.

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Mr.- Jame] G. K!ppler (T March 27, 1975 ph

'v' 6 DESCRIPTION OF OCCURREICE

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On March 19, 1975 at approximately 2130 hours0.0247 days <br />0.592 hours <br />0.00352 weeks <br />8.10465e-4 months <br />, the Unit 2 diesel generator was started but failed to come up to voltage.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE The apparent cause of this abnormal occurrence was dirty contacts on the Vs relay in the field flaching circuit of the Unit 2 diesel generator.

ANAT3 SIS OF OCCURREICE i

l The health and safety of the public were not in jeopardy due to this occurrence l because the Unit 2 diesel generator was out of service at the time of the

! occurrence and the Unit 2/3 diesel generator was operable as required by the Technical Specificationc.

CORRFL'TIVE ACTION An investigation was conducted the morning after the occurruice. During subsequent testing of the diesel generator it failed to come up to voltage two more times. The last timo, an electrician began checking the field flashing circuitry and found a low voltage reading on the Vs relay. The relay was then examined and its contacts cleaned. A service representative was called out from Electro-Motive. No 11trther problems with the diesel C:.tr:.t r ;;v.ld t; fcu.a. It Wed "

b l occuuuofull,y i,a i.imes 2nulcanng l

that the relay was apparently the problem. Inspection of the V, relay contacts will be cdded to the diesel surveillance schedule.

FAILURE DATA No failures of this type have previously occurred with the diesel generator.

N "

l B. B. Stephenson l ] Superintendent l

l BBS sap I

I File /NRC s i

UNITED STATES h NUCLEAR REGULATORY b]-.1 MISSION OFFICE OF INSPECTION AND ENFORCEMENT

. REGION lli

[ 799 ROOSEVELT ROAD GLEN ELLYN, ILLIh015 60137 A. IE Inspection Report No.

Transmittal Date  :

Distribution: Distribution:

IE Chief, FS&EB IE Chief, FS&EB IE:HQ (5) IE:HQ (4)

DR Central Files L:D/D for Fuels & Materials Regulatory Standards (3) DR Central Files Licensing (13) IE Files IE Files IE Chief, M& PPB L:D/D for Reactor Project B. IE Inquiry Report No.

Transmittal Date  :

Distribution: Distribution:

IE Chief, FS&EB IE Chief, FS&EB IE:HQ (5) IE:HQ DR Central Files DR Central Files Regulatory Standards (3) IE Files Licensing (13)

IE Files C. Incident Notification From: Commonwealth Edison 50-717 (Licensee & Docket No. (or License No.)

Transmittal Date  : Anril 11. 1975 Dresden Unit 2 i

Distribution: Distribution:  !

IE Chief, FS&EB IE Chief, FS&EB IE:HQ (4) IE:HQ (4)

Licensing (4) L:D/D for Fuels & Materials DR Central Files DR Central Files IE Files IE Files

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( SUBJECT DPR-19, DRESSEN NUCLEAR POWER STATION, UNIT 2. SD'A 37; ', 7 THIS WILL CONFIRM A CONVERSATION WITH MR JOHNSON OF. YOUR OFFICE AT #

, 1515 HOURS THIS DATE 'CONCERNING FAILURE OF DIESEL GENERATOR NUMBER 2 -

,. FAILED To BUILD UP VOLTAGE FOLLOWING MONTHLY INSPECTION APRIL 5

! r 1975. VS RELAY IS CAUSE OF FAILURE AND THIS WILL BE REPLACED 4-8-75. g B B STEPHENSON SUPERINTENDENT DRESDIN NUCLEAR POWER STATION l COMMONWEALTH EBISON C0 RR #1 MORRIS ILLINDIS 60450 \g l NNNN \

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