05000289/LER-1978-009-03, /03L-0 on 780315:dc Breaker CB3 Failed to Trip on One of Several Tests.Caused by Apparent Binding of Breaker Operating Linkage.Binding May Have Been Due to Insufficient Exercise of Breaker &/Or Lack of Maint

/03L-0 on 780315:dc Breaker CB3 Failed to Trip on One of Several Tests.Caused by Apparent Binding of Breaker Operating Linkage.Binding May Have Been Due to Insufficient Exercise of Breaker &/Or Lack of Maint

ML19289F150
Person / Time
Site:	Crane
Issue date:	04/03/1978
From:	Mitchell D METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289F146	List: 05000289/LER-1978-009, Forwards LER 78-009/03L-0 05000289/LER-1978-009-03, /03L-0 on 780315:dc Breaker CB3 Failed to Trip on One of Several Tests.Caused by Apparent Binding of Breaker Operating Linkage.Binding May Have Been Due to Insufficient Exercise of Breaker &/Or Lack of Maint
References
LER-78-009-03L-01, LER-78-9-3L-1, NUDOCS 7906040331
Download: ML19289F150 (2)

LER-1978-009, /03L-0 on 780315:dc Breaker CB3 Failed to Trip on One of Several Tests.Caused by Apparent Binding of Breaker Operating Linkage.Binding May Have Been Due to Insufficient Exercise of Breaker &/Or Lack of Maint

Event date:
Report date:
2891978009R03 - NRC Website

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LICENSEE EVENT REPORT i

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7 8 9 LICENSEE COCE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JG 57 CAT 58 CcN T

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8 60 61 COCK ET NUMBER 68 69 EVENT DATE 74 75 REPORT CATE 80 EVENT DESCRIPTION AND PRC8ABLE CONSEQUENCES h o

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'4crk vas being perforned to investigate reported sluggish operation of D.C. 3reaker a 3 ; C33. This' breaker failed to trip en one of several tests.

Corrective action was I

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l taken within the ti=e linits required in spec 3.5.1.6.

However, this censtituted l

o 3 ; cperation in a degraded = ode as repor*able per T.S. 6.9.2.3(2).

The failure of the I

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I breaker to trip resulted in a loss of redundancy. This event would not have pre-l o17 l vented a reactor trip.

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CAUSE

CAUSE COMP.

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9 10 11 12 13 18 19 20 SECU E NTI A L OCCURRENCE REPORT REVISION LER EVENT YE A R REPCRT NO.

CODE TYPE NO.

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,21 22 23 24 26 27 28 29 3a 31 J2 ACTION FUTURE EFFECT CHUTOCWN ATT ACHV E N T N P R O-4 PRIVE COMP.

COMPONENT TAKEN ACTION ON PLANT VETH00 HOURS SU6 MITTE D FORMbb8.

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33 34 25 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS a l "he breaker failed due to apparent binding of the breaker operating linkage.

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binding nay have been due to insufficient exercise of the breaker and/or lack of nain t tenance. The procedure vill be changed to increase the nunter of times the breaker

, ; will be tripped cc each test. The breaker linkage was cleaned, exercised, retested, and returned to service. Maintenance vill be perfor=ed this outage en the (cent'd) 7 8 9 80 SA

% POWER OTHER STATUS 015 RY DISCOVERY CESCRIPTION

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C l@l 3reaker reecr*ed crerstir.: slov1r l

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ACTIVITY CcN TENT AELEASED OF RELE A.SE AMOUNT OF ACTIVITY LOCATION OF RELEASE h

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7 3 9 10 11 44 45 80 PERSONNEL EXPOSURES NUv8ER TYPE D E SCRIPT'ON l 0 l o l o hl Z lh IIA I

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7 8 9 11 12 13 80 PERSONNE L INJURIES NUveER CESCRIPTION 01olol@l

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7 8 9 11 12 80 LOSS OF CR CAVAr.E TO FACILITY TYPE C E SCRIPTION l:l@l i

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Licensee Event Report 78-09/3L Cause Descrintion and Corrective Actionc (Cont'd) re=aining five breakers.

Breaker Data Control Device: 125 V D.C.

Operating Range: 90 V to 130 V Closing Solenoid: 125 V D.C.

Operating Range: 90 V to 130 V 225 Asp Fra=e Sise 600V 60 Cycle Cat. No. 22hA3510 - 316 CF Type EG-15-2 2 pole 2236 102