ML19340E260

LER 80-031/03L-0:on 801207,during Normal Operation,Leak Developed in Weld Connecting Demineralized Water Flush Line to Discharge Manifold of Charging Pump.Caused by Probable Piping Vibration.Crack Repaired & Pump Returned to Svc

ML19340E260
Person / Time
Site:	Fort Calhoun
Issue date:	12/17/1980
From:	Tesarek J OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340E257	List: ML19340E256 ML19340E260
References
LER-80-031-03L, LER-80-31-3L, NUDOCS 8101060769
Download: ML19340E260 (4)

Text

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NRC FORM J66 U. S. NUCLE AR REGUL ATORY COMMISSION i LICENSEE EVENT REPORT

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7 8 60 61 DOCKET NUVSER EVENT DATE j EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h FOTTI I During normal operation. a leak develooed in the weld which cnnnects the demine - l I

10131 I alized water flush line to the discharge manifold of Charoina Pumo CH-1B. Charoino i f

IOI4II oumos CH-1 A and CH-lC were coerable. therefore the reouirements of Technical Soeci- 1 l l0is1 I fication 2.2 were met. A similar event is described in LER 78-021. I 4

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i 33 34 35 36 31 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li10i l The probable cause of the weld leak was piping vibration. The crack in the weld I j ii iii I was repaired and charging pump CH-1B was returned to service. An engineering I l i, ,,i 1 evaluation is being performed on the problem of vibration of the flushing line I i,i3i l (EEAR FC-80-89). I I

LuaJ8 9l 7 80 STA S  % POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION Ii I s l [E_j@ l 017 l 5 l@l NA l W @l** Operator Observation l ACTIVITY CO# TENT AELE AEED OF HE LEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE LLLcj Lz_J @ LLJ@l NA l l NA 80 I

7 8 9 to 11 44 45 i PERSONNEL E XPOSURES i NUV8 E H TYPE DESCRIPTION i i 10 10 10 l@Lz_j@l NA l PERSONNi L i.uu'n'iES l NuveE a OtSCn. prion @

I i - NA l 7 8 9 10 10 10 18I12 11 80 LOSS OF on DAVAGE TO F ACILITY TYPE DESCRIPflON i 9 [7_j@l NA l 7 8 9 10 80

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NAYE G{ PREPARER

LER No.80-031 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 1 Safety Analysis During normal operation, a leak was observed in the weld which con-nects the demineralized water flush line to the discharge manifold of Charging Pump CH-18. Charging pumps CH-1A and CH-1C were operable during the time that CH-1B was recoved from service for repair of the weld, therefore, the requirements of Technical Specification 2.2 were met.

There was no significant radiation exposure to plant personnel or activity released.

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LER No.80-031 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 2 Corrective Action M.0. 8098 was initiated to repair the weld which connects the Jemineralized water flush line to the discharge manifold of Charging Pump CH-1B. The weld crack was ground out and the area was rewelded.

The weld was dye penetrant checked and hydrotested. Charging pump CH-1B was then returned to service.

An engineering evaluation is being performed on the problem of vibration of the demineralized water flush line (reference EEAR FC 89).

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LER No.80-031 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 3 Failure Data A previous related incident is detailed in LER 78-021.

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