ML19312C813

Forwards LERs 78-003/03L-0,77-029/03L-1 & 78-001/03L-2

ML19312C813
Person / Time
Site:	Oconee
Issue date:	03/23/1978
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8001100723
Download: ML19312C813 (2)

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LYSTEM tRIDS) s INF0FMATICN DISTPIEUTION 50-26'.2gj. 7 FE0liLATORY DI I.TRIE.UTION FOR INC0NING MATERIAL DOCDATE- 03/23/7?

ORG: PARPER W 0 DATE RCVD: 03/23/79

?. ' OREILLY J P DUKE PWR L.R C COPIES RECEIVED C T'r PE: LETTER NOTARIZED: NO LTR 1 EflCL 1 ON 02/22/78 CONCERNING ATTEMPT TO BvECT:

(R0 50-269/78-003) SOURCE OF AUXILIARY PWR FOR SUGJECT FACIL CENSEE EVENT REPT N

PRT FE0 WEE H'fDF0 UNIT 2, BREAKER.

W/ATT LER 78-003,

)ILIED DUE TO AN INOFERABLE FIELD FLASHING

>-029 6 7G-001.

REVIEWER INITIAL:

XJN 1

DISTRIBUTER INITIAL; LANT NAME: OCONEE - UNIT OCONEE - UNIT 2 OCONEE - UNIT 3 IS AS FOLLOWS **************4,*++

DISTRIBUTION OF THIS MATERIAL o**+44***********

CUNNINGHAM - ALL AMENDMENTS TO FSAR AND CHANG 10TES:

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INCIDENT REPORTS tDI3TRIEUTIGN CODE A002) 4 ENCL BR CHIEF PCT +

FOR ACTION:

7 NRC PDR**W/ ENCL nEG FILE 4*W/ ENC MIPC**W/3 ENCL INTERNAL:

--b-E* +W a

-E-HOUSTON **W/ ENCL SCHROEDER/IPPOLIT0**W/ ENCL GRIMES **W/ ENCL NOVAK/ CHECK **W/ ENCL BUTLER **W/ ENCL KNIGHT **W/ ENCL TEDESCO**W/ ENCL HANAUER**W/ ENCL BAER**W/ ENCL EISENHUT**W/ ENCL VOLLMER/ BUNCH **W/ ENCL SHAG **W/ ENCL ROSA **W/ ENCL KREGER/J. COLLINS **W/ ENCL K SEYFRIT/IE**W/ ENCL LPDR'S EXTERNAL:

WALHALLA. SC+4W/ ENCL TIC **W/ ENCL 3 gyr SU39.ITTED PER NSIC+*W/ ENCL GUI.ATORY GUIDE 10.1 ACRS CAT B**W/16 ENCL 6

NN r"om LTR 45 ENCL 45 lDISTRIEUTION:

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THE END soo1 a 0 o723 o.ok,

DUKE POWI.N COSUMNY Pow en Di it :u o Sotr a C u r uc a S r n t.c r. C naut.oT T E. N C,,2e e w,

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.J Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Suite 1217 230 Peachtree Street, Northwest Atlanta, Georgia 30303 RE: Oconee Units 1, 2, and 3 Docket No. 50-269, -270, and -237

Dear Mr. O'Reilly:

Pursuant to Sections 6.2 and 6.6.2 of the Oconee Nuclear Station Technical Specifications, please find attached Reportable Occurrence Report R0-269/78-3.

Also attached are revised Licensee Event Reports submitted on two similar occurrences reported in Reportable Occurrence Reports RC-269/B-29 and R0-269/78-1, originally transmitted by my letters of January IS, and February 3,1978, respectively.

Ver/trulyyours,

- a. )w n r.

55,.

'Jilliam O. Parker Jr./t w i;

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Director, Of fice of Management Inf o rmation cc:

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DL*KE PC'iER CC"PANY l

OCONEE UNIT '

Report Number:

R0-269/78-3 i

Report Date:

P. arch 23, 1978 Occurrence Date:

February 22, 1978 Facility: Oconee Nuclear Station, Seneca, South Carolina i

Identification of Occurrence:

Keovee Hydro Unit 2, Field Flashing 3reaker Inoperable i

l Conditions Prior to Occurrence: Unit 1 1007. FP l

Unit 2 1007. FP i

Unit 3 1007.,FP Description of Occurrence:

I At 1750, on February 22, 1978, when an attempt was made to start Keowee Hydro Unit 2, the unit's field flashing breaker failed to close.

The unit was there-f are inoperable, contrary to the requirements of Oconee Nuclear Station Techni-cal Specification 3.7.1.

The unit was started and successrully operated at i

i 1752.

The breaker and controls, wires and contacts within the breaker were in-spected with no abnormalities discovered.

The unit has successfully started on several subsequent occasions.

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This type of incident has occurred on two previous occasions, which were reported in Reportable Occurrence Reports R0-269/77-29, and R0 269/73-1, transmitted by my letters of January 18, and February 3, 1978 respectively.

l Apparent Cause of Occurrence:

The apparent cause of the incident was. initially identified as a faulty relay 1

within the field flashing breaker control syste=.

The apparently faulty relay was replaced, along with another relay that had been arcing.

After relay re-placement, and during the investigation of this report, the breaker failed to 4

operate again.

Therefore, the exact cause of the breaker =alfunction has not yet been determined.

The breaker system is continuing to be observed to deter-mine the cause of the incident.

J Analysis of Occurrence:

The failure of the breaker to close caused Keowee Unit 2 to become temporarily i

inoperable.

Two minutes after the initial unsuccessful attempt, the field flashing breaker successfully operated making Keowee Unit 2 fully operable.

Throughout this period, the second Keowee Hydro unit was fully operable and available to supply emergency power to the station if required.

The health and i

safety of the public were not endangered.

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. Corrective Action 1

3 Initially an inspection of the breaker and its controls was made with no j

def ective components disco.ered.

During the investigation of this report two relays in the field flashing bre.aker control circuit were replaced.

An extensive investigation is i

continuing in this area of concern to correct the breaker control system faults.

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[TTil 1 At 1750 on February 22, 1978, during normal operation, Oconee attempted to La 2] 1 start cowee Hydro Unit 2 which is a source of auxillary power for the Oconee ;

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The unit started on the second and on subsecuent attempts.

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During subsequent investigations the 3,i;31 breaker failed on three other occasions.

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EV F.NT OE SC AIPTICN ANO **3C'5 A 4L1 CONS ECUENCES h to 121 Louring normal operation Keowee avdro Unit 2 failed to start on initiation i

[21211from Oconee control room.

Since Keovee 2 is a source of auxiliary power l

Iol41ifor the Oconee station (Units 1, 2, and 3) this is reportable under I

o s IT. S. 6.6.2.1.b.(2).

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ti!ali The Field Flashing Breaker on the generator failed to close on first attempt.,

,,,,,,The breaker was verified as operable by subsequent operation and visual g,,;,texamination.

Nor.al inspection and servicing resulted in no further correc-ti!3l [ tive action.

Extensive investigation is continuing as of March 23, 1978.

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Since Keowee 2 is a source of auxiliary power I 3 L. j l for the Oconee station (Units 1, 2, and 3) this is reportable under 2is l T. S. 6.6.2.1.b.(2).

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li)o]1 The Field Flashing 3reaker (DB-26) on the generator failed to close on first i

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The breaker was verified as operable by subsequent operation and

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Inspection and servicing resulted in no further correc 3 tive action.

Extensive investigation is continuing as of March 23, 1973.

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