ML19321A742

LER 80-016/03L-0:on 800621,weld on Suction Side of Pump CH-1B in Demineralized Water Flush Line Cracked.Caused by Vibration of Piping in Svc.Crack Was Ground Out & Rewelded Using Certified Procedure & Line Tested

ML19321A742
Person / Time
Site:	Fort Calhoun
Issue date:	06/25/1980
From:	Jewell W OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19321A738	List: ML19321A737 ML19321A742
References
LER-80-016-03L, LER-80-16-3L, NUDOCS 8007240134
Download: ML19321A742 (4)

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LICENSEE EVENT REPORT

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DATE 7 8 60 61 DOCKET NUMcER 68 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h EI The weld on the suction side of the pump CH-1B in the demineralized water flush I r5 trl I line cracked. Redundent charging pumps CH-1A and CH-1C were operable therefore I

OiAi l Technical Specifications 2.2. requirements were satisfied . Related LER's are I iO isi I LER 78-005,78-006, 78-046. I l

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43 44 47 CA;JSE DESCRIPTION AND CORRECTIVE ACTIONS h li101i The crack was due to vibration of the oicino in service. The crack was around out I it sil I and rewelded usino a certified procedure and the line was hydrostatically tested i D TT1 I before returning to service. No other corrective measures required. I I

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LER No.80-016 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000295 ATTACHMENT NO. 1 Safety Analysis During the time that CH-1B was out of service for repair of the crack in the demineralized flush line, CH-1A and CH-1C were operable except for a two hour period that CH-lC was out of service due to a solenoid that failed open on the leak off line.

- na Technical Specifications 2.2(3) Modification of Minimum Require-ments ments were met and there was no significant exposure to plant personnel or activity released to the atmosphere.

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LER No.80-016 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT NO. 2 Corrective Action The crack in the weld of the demineralized flush line was repaired by grinding out the old weld and rewelded using a certified procedure.

The line was hydrostatically tested before returning to service.

The vibration in the piping has been addressed and a modific.ation to install suporessors on the pump suction and discharge side has tieen partially completed.

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LER No.80-016 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT NO. 3 Failure Data This is the fourth reportable failure of this type at Fort Calhoun Station. Incidents that are related to this failure were previously documented on LER 78-005,78-006 and 78-046.

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