05000317/LER-1979-030-03, /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

/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: 05000317/LER-1979-030, Forwards LER 79-030/03L-0 05000317/LER-1979-030-03, /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
References
LER-79-030-03L-01, LER-79-30-3L-1, NUDOCS 7908280639
Download: ML19261E536 (2)

LER-1979-030, /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

Event date:
Report date:
3171979030R03 - NRC Website

text

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2 1 Durino nomal operation the olant ooerator discovered water leakinc Trom 2__

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a I cracked weld on 11 Resector Coolart Charcino Pum) discharoe manual isolation l

Ivalve. The cumo was immediatelv removed from service and the leak isolated.

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4 l A similar event is _ described in LER 78-55 (U-1). Two redundant charoina oumos I

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lV l0 [8 15 [g l B lgl34 33 3b 36 Je 40 41 42 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h iio lCause of leakace was a cracked recair weld on the discharce isolation valve. The t

Icrack was located on the body to bonnet seal weld which was oreviousiv recaired as

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

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3 iweld has now been repaired usino the cas tungsten arc arecess, which leaves no (CONT) J c

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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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