ML19312E503

LER 80-024/03L:on 800430,while Making Containment Insp, Discovered Cracked Weld on 11B Reactor Coolant Pump Control Bleedoff Line.Caused by Metal Fatigue Induced by Vibration. Pipe Replaced & Weld Repair Performed

ML19312E503
Person / Time
Site:	Calvert Cliffs
Issue date:	05/30/1980
From:	Davis S, Huseby D BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19312E497	List: ML19312E496 ML19312E503
References
LER-80-024-03L-01, LER-80-24-3L-1, NUDOCS 8006050035
Download: ML19312E503 (1)

Text

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LICENSEE EVENT REPORT 4

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OOCKET NUM8 gn 68 69 EVENT DATE 14 75 AEFORT DATE 80 7 8 60 63 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012l l AT 0515 UHILE MAKING A CONTAINMFNT TN90rCTTOM TuF OpF?ATnP nicenVrQrn fi l I

10 31 I CRACKED WELD ON 11B REACTOR COOLANT PUMP (RCP) CONTROL BLEED 0FF LINE 1o44Il(T.S. 6.9.1.9.d). SINCE THE LEAK COULD fl0T BE ISOLATED FROM THE RCP SEAL I lo J s1 LTHE REACTOR WAS PLACED IN COLD SHUTDOWN TO FACILITATE REPAIRS. THE IWELD I

l o le 1 l REPAIRED AND THE UNIT RETURNED TO SERVICE AT 1910 Ori E/5/80. THIS IS NOT I

I o I 7 I I A REPETITIVE OCCURRENCE.

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTICNS l

lt I o 11 THIS CRACK WAS LOCATED IN THE HEAT AFFECTED ZONE OF THE WELD JOINING THIS 4" f

li t i l I LONG.1" DI AfdETER. SCHED. 80 SP0OL TO THE SEAL. APPARENT CAUSE WAS METAL FATIGUE l

, I i I 2 I I TNnurCD BY VIBRATION HFAT-UP/COOLDOWN CYCLES . AND/OR BRITTLENESS FROM WELDING I

ii t3l l ON INITIAL INSTALLATION. THE FAILED PIPE WAS REPLACED AND A WELD REPAIR FERFORMED.

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! I ENGINEERING REVIEW AND EVALUATION HAS BEEN INITIATED. J Ii i4 i C'

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'SsV E 1 : 101 I N [@ l DESCRIPTIONNA l i lli!!!l111!li 68 39 80 ;

7 8 9 to S. M. DAVIS /D. E. HUSEBY PHONE: (3011?60 4742/4R16 2 NAME OF PREPAAER 800605OQ3y

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