ML19263D338

LER 78-013/01T-1 on 781107:emergency Diesel Generator Vendor,Colt Industries,Notified Util of Speed Switch Design Problem That Could Potentially Fail.Switch Replaced W/Another Part from Different Vendor

ML19263D338
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/22/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263D333	List: ML19263D332 ML19263D338 ML19263D343 ML19263D346 ML19263D352
References
LER-78-013-01T, LER-78-13-1T, NUDOCS 7903270473
Download: ML19263D338 (4)

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o NRC FORM 366 U. S. NUCLE AR R EGUL ATORY COMMISSION (7 77)

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COCA E T NUMeE R (# 6'. EVENT DATE 74  ?$ HFPOH1 O ATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 i Prior to initial criticality the Enercency Diesel Generator Vendor l Oi3 I (Colt Industries, Inc.) notified AP&L that a speed switch manufactured i o 14 l l by Dynalog Corp. had a design problem that potentially could cause a c s I failure. Investication revealed that the switch was only installed on I io 3 ; the "A" Diesel and no problems have been encountered. There have been j

[o 1il l no similar occurrences. This is reportable per T.S.6.9.1.8(i).  ;

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3J 34  % 33 40 41 el 43 44 et C AUSE DESCR.PTION AND CORREC rlVE ACTIONS h i o [ The speed switch contained a resistor which had a potential problem i g,,,j; which could cause a component failure. The switch was replaced with ,

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NAME OF PREPAnEn Chris N. Shively , u g,, 5d}/968-2519 730327oy73

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1. Reportabic Occurrence Report No. 50-368/78-13

2. Report Date: 03/22/79 3. Occurrence Date: 11/07/78 4 Facility: Arkansas Nuclear One - Unit 2 Russellville, Arkansas

5. Identification of Occurrence:

Hotification by the Emergency Diesel Generator vendor that a speed switch has a potential problem which could result in a component failure.

6. Conditions Prior to Occurrence:

Steady-State Power Reactor Power 0 MWth Hot Standby Net Output 0 MWe Cold Shutdown Percent of Full Power 0  %

Refueling Shutdown Load Changes During Routine Power Operation 0 Routine Startup Operation Routine Shutdown Operation Other (specify) X Preoperational, Start-up or Power Ascension Tests

7. Description of Occurrence:

The speed switch in the Emergency Diesel Generator had the potential problem'which could result in a component failure.

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Reportable Occurrence Report No. 50-368/78-13

8. Designation of Apparent Cause of Occurrence:

Design Procedure hbnufacture X Unusual Service Condition Including Environmental Installation /

Construction Component Failure (See Failure Data)

Operator Other (specify)

9. Analysis of Occurrence:

The decision to replace the speed switch was made knowing that when the motor is at approxiuately 810 rpm, it vill excite the generator and should it nalfunction during this start-up, it could have caused overloading and possible further damage to the generator. There was no hazard to the health and safety of the public since -the other diesel generator was unaffected and the reactor had never been critical.

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Reportable Occurrence Report n'o. 50-368/78-13

10. Corrective Actio..:

The switch was replaced with one manufactured by another vendor and was satisfactorily tested.

11. Failure Data:

There have been no similar occurrences.