ML19261E536

LER 79-030/03L-0 on 790728:water Leak Discovered on Discharge Isolation Valve of Reactor Coolant Charging Pump. Caused by Cracked Repair Weld on Discharge Isolation Valve. Weld Repaired Using Gas Tungsten Arc Process

ML19261E536
Person / Time
Site:	Calvert Cliffs
Issue date:	08/23/1979
From:	Lagiewski J, Miernicki M BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19261E533	List: ML19261E532 ML19261E536
References
LER-79-030-03L-01, LER-79-30-3L-1, NUDOCS 7908280639
Download: ML19261E536 (2)

Text

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ato EVENT DESCRIPTION ANo PROBABLE CONSEQUENCES h o 2 1 Durino nomal operation the olant ooerator discovered water leakinc Trom 2__ l O a I cracked weld on 11 Resector Coolart Charcino Pum) discharoe manual isolation l o 4 Ivalve. The cumo was immediatelv removed from service and the leak isolated. I

o 5 l A similar event is _ described in LER 78-55 (U-1). Two redundant charoina oumos I o e I remained onerable at all times. I o 7 I I Ol8 l l 7 8 9 80 OE CO E S BC E COVPONENT CODE SLOC E SUB E 7

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42 lV l0 [8 15 [g 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h iio lCause of leakace was a cracked recair weld on the discharce isolation valve. The t i i Icrack was located on the body to bonnet seal weld which was oreviousiv recaired as _j

i described in LER 78-55 uy usinc the shielded metal arc weldina technioue. The reoair i

, 3 l weld may have failed due to over-arin6na of the weld in orecaration for NCE. The l c iweld has now been repaired usino the cas tungsten arc arecess, which leaves no (CONT) J

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LEIR NO. 79-30/3L EVENT DATE 07-28-79 REPORT DATE 08-23-79 DOCKET NO. 50-31/

ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS: (CONTINUED) slag, so no grinding preparation for NDE was necessary. In the future the gas tuncsten are process will be the preferred process in repairing similar seal welds.

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