ML19319C010

Deficiency Rept Re Personnel Lock,Equipment Hatch & Emergency Lock Embedment Sleeve Seal Welds.Subsequent to IE Insp Rept 50-346/75-20,noting Noncode Fillet Weld,Items Found Not seal-welded to Sleeves

ML19319C010
Person / Time
Site:	Davis Besse
Issue date:	08/24/1976
From:	Roe L TOLEDO EDISON CO.
To:
References
104, NUDOCS 8001300744
Download: ML19319C010 (3)

Text

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TOLEDO Ei[3lEit)ryl August 24, 1976 LO'W' ELL E. ROE

v. un.d.,

Serial No. 104 (4191 259-5242 Docket No. 50-346 ,

Mr. James G. Keppler Regional Director, Region III Directorate of Regulatory Operations U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

This letter is submitted in accordance with 10 CFR 50.55(e) as consummation of the Toledo Edison Interim Report dated November 25, 1975, regarding the apparent deficiency related to the Davis-Besse' Nuclear Power Station Unit No. 1 personnel lock, equipment hatch, and emergency lock embed =ent sleeve seal welds.

Description of the Deficiency As noted in I.E. Inspection Report No. 050-346/75-20, a non-code fillet veld was applied in the field to seal weld the e=bedment sleeve to the personneljlock. Upon our investigation, we discovered that this seal weld was required but had been overlooked by Chicago Bridge and Iron personnel during the fabrication of the personnel lock due to a misinterpretation of a weld symbol on the personnel lock embedment sleeve drawing. Further inves-tigation revealed that the equipment hatch and emergency lock also had not been seal welded to their embedment sleeves. Again, misinterpretation of the weld symbol was determined to be the cause of this deficiency.

Ccrrective Action The Chicago Bridge and Iron drawings for the equipment hatch, personnel lock, and emergency lock embedment sleeves have been revised to clearly show an intermittent fillet veld on one side of the attachment of the embedment sleeve to the lock and a continuous fillet seal weld on the other side.

Chicago Bridge and Iron is presently on site to make the necessary approved repairs to the personnel lock, emergency lock, and equipment hatch.

- The non-code accepted weld on the personnel lock is being removed by are goug-ing, and cleared by magnetic particle inspection. The seal veld will then be 6 t,563 THE TCLEDO EDISON CCMPANY EDISON PLAZA 300 MAO! SON AVENUE TOLEDO. OH10 43652

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, - t Mr. James G. Keppler Regional Director, Region III Page Two .

August 24, 1976 S

tade using welders qualified in accordance with Section II of the ASME Boiler and Pressure Vessel Code, and the final weld magnetic particle inspected.

For the equipment hatch and emergency lock, the seal weld will be completed as required by the revised embedment sleeve drawings and the final weld magnetic particle inspected.

Safety Implications

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Any possible adverse safety considerations have been resolved vith the timely discovery and repair of the personnel lock, equipinent hatch, and emergency lock embedment seal welds.

Yours very truly, ss cc: Dr. Ernst Volgeneau, Director /

Office of Inspection and Enforcement

.U. S. Nuclear Regulatory Commission Washington, D.C.

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