ML19329B739

Deficiency Rept Re 720528 or 29 Shipping Damage to Containment Vessel Equipment Hatch En Route from Site to Chicago Plant for Stress Relieving.Repairs Effected,Hatch Assembly Stress Relieved,Reshipped to Site & Installed

ML19329B739
Person / Time
Site:	Davis Besse
Issue date:	08/03/1972
From:	TOLEDO EDISON CO.
To:
Shared Package
ML19329B735	List: ML19329B734 ML19329B739
References
NUDOCS 8002060746
Download: ML19329B739 (2)

Text

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D['S-BESSE NUCIEAR PCiER STATICN Report of Shipping Da= age to Centain=ent Vessel Equipment Hatch.

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Background

The contain=ent vessel for the Davis-Besse Station is being fabricated and field-erected by the Chicago Bridge & Iron Cc=pany and is in final stages of erection.

The 13-foot dia=eter equipment hatch for this structure had been shipped to the job site en April 11, 1972. After shipment, a routine internal CE&I shop audit disclosed that velded attach =ents had been attached after stress reliev-ing, which required further tress relieving.

--On-May 2h,1972, this equipment hatch was shipped from the site to the Chicago plant for stress relieving in the shop facilities.

Incident -

on May 28 or 29, 1972, while the shipping ' car was on the Penn Central Railroad at Elkhart, Indiana, the shipping car was hu= ped sufficiently to damage the equipment hatch. Upen arrival at the C3&I Chicago plant, inspection revealed

. damage to the' extent that repair vould be necessa:/.

Inspection and Renair A complete inspection and repair procedure with results of da= age was sub=itted under date of. June e, 1972, and approved en June 9, 1972.

be danage consisted of two dented-in areas of the dished decr head. The ene tire head was cleaned of paint, the veld sea =s and attach =ent velds were sand-blasted and magnetic pe.rticle tested.

e 8002060 g

Te center portion of thwdoor head containing the two de".ed areas was cut out and replaced with a new dished center plate.

4 i The entire equipment hatch assembly was then st ess relieved, final inspected, and finished for shipment.

The inspection, repair, and stress relieving was completed and the hatch assembly re-shipped to the job site on June lh, 1972. Installation of the hatch assembly in t* ne centainment vessel commenced on June 26, 1972, and is essentially cc=plete.

Summary The shipping damage to the containment vessel equipment hatch was inspected and

j. repaired using detailed approved precedures in the nanufacturer's plant and the hatch meets all requirements of the codes and specifications under which it was manufactured.

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-August 3, 1972 l

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