ML19309H640

LER 80-025/01T-0:on 800415,during Tank Mod Project,Weld on 12-inch Nozzle Penetration to Refueling Water Storage Tank OS-TK-1 Reported Not to Be in Conformance W/Design.Caused by Failure of Manufacturer to Follow Drawings

ML19309H640
Person / Time
Site:	Beaver Valley
Issue date:	04/30/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309H635	List: ML19309H634 ML19309H640
References
LER-80-025-01T, LER-80-25-1T, NUDOCS 8005130582
Download: ML19309H640 (3)

Text

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od 69 EVENT 3 ATE 74 75 AEPcRT QA*E 1 P 4 60 68 CoCAET NLMg E R EVENT cESCAtPTION AND PACGA8LE CONSECUENCES h l o 121 l During a .nt' .dodification project, Beaver Valley field engineers reported on [ l Io;2j 14/15/80 that a weld on one of the 12" nozzle penetrations to the Refueling Water This tank l

Io64I lStorace Tank [0S-TK-11 does not conform with the manufacturer's desien.

loIsi iIOS-TK-11 was manufactured by Craver Tank and Mfg. Co. This condition was I The design ]

g (discovered during the process of addine an internal elbow to the tank.  !

As j lojii [ specification called for all tank penetrations to be full penetration welds.

ioj3, I found, the piping penetrations are seal welded on the inside (continued on attached) 80; )'

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li 6 01 lThe cause of the problem is a manufacturer's failure to follow the design drawings 3eaver i ii;ii isupplied to them by their own company when erecting this tank en site.

m l valley is now in the process of detailing a means to test Demineralized Water l l

l,13l lStorace Tank {WT-TX-101 which is another Graver-manufactured tank erected on site.

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e Attachment To LER 80-25/OlT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 Event Description And Probable Consequences (continued) of the tank and a reinforcing pad external to the tank is fillet welded.

(See attached drawing of one 12" penetration). The stress analysis for the "as found" weld has not yet been completed so no probable consequerces can be advanced. The results of this analysis will be identified in a followup report.

Cause Description And Corrective Actions (continued)

Demineralized Water Storage Tank [WT-TK-10], Boron Recovery Test Tanks [BR-TK-2A]

and [BR-TK-2B], Coolant Recovery Tanks (BR-TK-4A] and [BR-TK-4B] and Primary Water Storage Tanks (BR-TK-6A] and [BR-TK-6B]. At the present time, Demineralized Water Storage Tank [WT-T:(-10] will be it.spected and repaired, if found to need it. There is no program at the present time to test any of the non-safety related tanks.

Beaver Valley Onsite Engineering Group and a construction service crew will make all necessary repairs. No time frame for completion of the inspections has been  !

set as of this date.

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