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INF0FMATICN DISTPIEUTION 50-26' .2gj. 7FE0liLATORYDI I.TRIE.UTION FOR INC0NING MATERIAL DOCDATE- 03/23/7?

ORG: PARPER W 0 DATE RCVD: 03/23/79?. ' OREILLY J P DUKE PWRL.R C COPIES RECEIVED

C T'r PE: LETTER NOTARIZED: NO LTR 1 EflCL 1

ON 02/22/78 CONCERNING ATTEMPT TOBvECT:(R0 50-269/78-003) SOURCE OF AUXILIARY PWR FOR SUGJECT FACILITY,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 2OCONEE - UNIT 3

IS AS FOLLOWS**************4,*++

DISTRIBUTION OF THIS MATERIALo**+44***********

CUNNINGHAM - ALL AMENDMENTS TO FSAR AND CHANGES TO TECH SPECS10TES:M.,

INCIDENT REPORTStDI3TRIEUTIGN CODE A002)

4 ENCLBR CHIEF PCT +FOR ACTION: 7NRC PDR**W/ ENCL

nEG FILE 4*W/ ENC MIPC**W/3 ENCLINTERNAL: --b-E* +W a -E- HOUSTON **W/ ENCLSCHROEDER/IPPOLIT0**W/ ENCL GRIMES **W/ ENCLNOVAK/ CHECK **W/ ENCL BUTLER **W/ ENCLKNIGHT **W/ ENCL TEDESCO**W/ ENCLHANAUER**W/ ENCL BAER**W/ ENCLEISENHUT**W/ ENCL VOLLMER/ BUNCH **W/ ENCLSHAG **W/ ENCL ROSA **W/ ENCLKREGER/J. COLLINS **W/ ENCLK SEYFRIT/IE**W/ ENCL

LPDR'SEXTERNAL: WALHALLA. SC+4W/ ENCLTIC **W/ ENCL 3 gyr SU39.ITTED PERNSIC+*W/ ENCL

GUI.ATORY GUIDE 10.1ACRS CAT B**W/16 ENCL

6NNr"omLTR 45 ENCL 45

|DISTRIEUTION:, 5 I ?.E: 1P+2P+3P ***+**++***********************G1 THE END***********************************

soo1 a 0 o723 o.ok,

. .

DUKE POWI.N COSUMNYPow 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 , ,- - Iac::

-u..0 - a . c a. s a. March 23, 1978(Cf F e t t *,t as . . , , , , , , , .,

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.

Mr. James P. O'Reilly, DirectorU. S. Nuclear Regulatory CommissionSuite 1217230 Peachtree Street, NorthwestAtlanta, Georgia 30303

RE: Oconee Units 1, 2, and 3Docket No. 50-269, -270, and -237

Dear Mr. O'Reilly:

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

Also attached are revised Licensee Event Reports submitted on two similaroccurrences reported in Reportable Occurrence Reports RC-269/B-29 andR0-269/78-1, originally transmitted by my letters of January IS, andFebruary 3,1978, respectively.

Ver/trulyyours,

- a. )w n r. 55,.'

'Jilliam O. Parker Jr./t .

, w i;*J e ~:, .

KR'4/p t'-

(y%eAttachment '':. j j. ?.i,.

.fg.Director, Of fice of Management Inf o rmationcc:

and Program Control

V0

; eibwaaman

_ ._ ._ _ ._ _ _ _ _ . . . _ - _ .. . _ _ _ - __ _

!

'

DL*KE PC'iER CC"PANY| 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 Carolinai

Identification of Occurrence: Keovee Hydro Unit 2, Field Flashing 3reakerInoperable

i

l Conditions Prior to Occurrence: Unit 1 1007. FP| Unit 2 1007. FPi Unit 3 1007.,FP:

Description of Occurrence:I

At 1750, on February 22, 1978, when an attempt was made to start Keowee HydroUnit 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 ati

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.

id 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 bymy letters of January 18, and February 3, 1978 respectively.

| Apparent Cause of Occurrence:

The apparent cause of the incident was. initially identified as a faulty relay1 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 to4 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 temporarilyi 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 andavailable to supply emergency power to the station if required. The health andi

safety of the public were not endangered.|

|

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. Corrective Action '

- - -

13 Initially an inspection of the breaker and its controls was made with noj 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 |

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! continuing in this area of concern to correct the breaker control system !'

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La 2] 1 start cowee Hydro Unit'

2 which is a source of auxillary power for the Oconee ;INuclear Station. The unit failed to starto * _

due to an inoperable field flashinelDJ s.] [ breaker. The unit started on the second and on subsecuent attempts. Keowee yfo T lUnit I and other sources of auxiliary power for the station were available if

glolil Lneeded so that loss of enertency pcwer was experienced.noThus public health,

t2;a1tand safety were not endangered.' ' '

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I, j o-] [ The breaker and it 's control system were initially inspected with noJ[ apparent abnormalities disccvered. During subsequent investigations the

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3,i;31 breaker failed on three other occasions. Faulty relays were at first suspect;t,,,jt but the third failure occurred after two relays were replaced. The apparent[ . 1 Leause has not been determined but extensive investigation is continuing.> s i

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EV F.NT OE SC AIPTICN ANO **3C'5 A 4L1 CONS ECUENCES hto 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 |

Io|41ifor the Oconee station (Units 1, 2, and 3) this is reportable under I

o s IT. S. 6.6.2.1.b.(2). The unit started ncrually on second and subsequent }

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cause cescairneN ANoccantenvt Acmens @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!3| [ tive action. Extensive investigation is continuing as of March 23, 1978. ;I

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(TDA~.J GPORT - PBEt.* IOU 3 arPORT 2/23/73

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|oIjl_DuringnormaloperationKeowceH@ydroUnitEvtNr :tscmencN ANo eacsants ccNstoutNcts

2 failed to start on initiation |

[ o ! 21 1 f rom Oconee control room. Since Keowee 2 is a source of auxiliary power ;

I 3 L. j | for the Oconee station (Units 1, 2, and 3) this is reportable under ;

2is | T. S. 6.6.2.1.b.(2). The unit started normally on second and subsequent|

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li)o]1 The Field Flashing 3reaker (DB-26) on the generator failed to close on first i,,,,,, attempt. The breaker was verified as operable by subsequent operation and

,

,,,,,i visual examination. Inspection and servicing resulted in no further correc 3tive action. Extensive investigation is continuing as of March 23, 1973., , , , , ,

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