ML19312C813

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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)
v • d • e


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FE0liLATORY INF0FMATICN DISTPIEUTION 50-26' .2gj. 7 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 NOTARIZED: NO LTR 1 EflCL 1 C T'r PE: LETTER BvECT: ON 02/22/78 CONCERNING ATTEMPT TO CENSEE EVENT REPT (R0 50-269/78-003) SOURCE OF AUXILIARY W/ATTPWR FOR SUGJECT LER 78-003, N FACILI PRT FE0 WEE H'fDF0 UNIT 2, BREAKER.

)ILIED DUE TO AN INOFERABLE FIELD FLASHING

>-029 6 7G-001.

XJN REVIEWER INITIAL:

1 DISTRIBUTER INITIAL; LANT NAME: OCONEE - UNIT OCONEE - UNIT 2 OCONEE - UNIT 3 **************4,*++

IS AS FOLLOWS o**+44*********** DISTRIBUTION OF THIS MATERIAL 10TES:

, M. CUNNINGHAM - ALL AMENDMENTS TO FSAR AND CHANG INCIDENT REPORTS tDI3TRIEUTIGN CODE A002) 4 ENCL FOR ACTION: BR CHIEF PCT + 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 EXTERNAL: LPDR'S WALHALLA. SC+4W/ ENCL TIC **W/ ENCL 3 gyr SU39.ITTED PER NSIC+*W/ ENCL ACRS CAT B**W/16 ENCL GUI.ATORY GUIDE 10.1 r"om NN 6 LTR 45 ENCL 45 lDISTRIEUTION:

, 5 I ?.E: 1P+2P+3P 1 THE END ***+**++***********************G

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DUKE POWI.N COSUMNY Pow en Di it :u o , , ,

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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 R0-269/78-1, reported in Reportable Occurrence Reports RC-269/B-29 and originally transmitted by my letters of January IS, and February 3,1978, respectively.

Ver/trulyyours,

'Jilliam - a.O. Parker )w nJr./tr.

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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-i cal Specification 3.7.1. The unit was started and successrully operated at i 1752. The breaker and controls, wires and contacts within the breaker were in-

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spected with no abnormalities discovered. The unit has successfully started on

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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-

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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 i

available to supply emergency power to the station if required. The health and safety of the public were not endangered.

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. Corrective Action

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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 l i bre.aker control circuit were replaced. An extensive investigation is l

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

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[TTil 1tvtwr At 1750 cescairnes ano eaca44tz ccroszcutNets @

on February 22, 1978, during normal operation, Oconee attempted to

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  • INuclear Station. The unit failed to start due to an inoperable field flashinel

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The unit started on the second and on subsecuent attempts. Keowee y fo T lUnit I and other sources of auxiliary power for the station were available if g

lolil Lneeded so that no loss of enertency pcwer was experienced.

Thus public health, t2;a1tand safety were not endangered.

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.i 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). The unit started ncrually on second and subsequent }

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

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