ML19263A765

Discusses Reportable Situation Re Turbine Bldg Column Depth/ Thickness Ratios,Which Exceeded Allowable Levels.Mod Consists of Welding Stiffener Plates Between Column Flanges. Corrective Action Is Complete

ML19263A765
Person / Time
Site:	Diablo Canyon
Issue date:	12/11/1978
From:	Crane P PACIFIC GAS & ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML16341C344	List: ML16341C343 ML19263A765
References
NUDOCS 7901020290
Download: ML19263A765 (2)

Text

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PICIFIC G-A S AND E LE C T RI C C O M PANY 3 PCB E23 l

77 BEALE STREET,31ST FLOOR

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C H A R L e S W. 7Mt5SEL L Mr. R. H. Engelken, Director Office of Inspection and Enforcement k, C,,3 Region V J

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Re:

Docket No. 50-275-OL v

'y Docket No. 50-323-OL

' ";; ; M' Diablo Canyon Site

Dear Mr. Engelken:

On November 13, 1978, the NRC Office of Inspection and Enforcenent, Region V, was notified by telephone of the following situation which was deemed reportable under Paragraph (e) (ii) of 10 CFR 50.55.

Drawings of the Turbine Building showing modifications required by the Hosgri criteria were issued " Approved for Construc-tion."

-A later review which required the consideration of a fully loaded crane coincident with the Hosgri event indicated that the more heavily loaded columns, which had no required modifications on the approved drawings, had not been checked for depth / thickness ratios for the column webs.

These ratios were found to exceed the allowables of the American Institute of Steel Construction (AISC)

Manual of Steel Construction, 7th edition, Specification for Plastic Design.

This report is a summary of the actions taken regarding this deficiency.

A Nonconformance Report (NCR), No. DCO-78-EG-018 was initiated November 13, 1978, in accordance with Procedure 9.1 of the PG&E Er.gineering Manual.

Drawings showing the modifications required to satisfy the depth / thickness ratios of the AISC Specifi-cation were issued " Approved for Construction" on November 17, 1978.

The modifications consisted of welding to the web and flanges stiffener plates between the column flanges at appropriate spacings.

2901o202 %

Mr.

R. H. Engelken December 11, 1978 The personnel involved in the IIosgri analysis and design of the Turbine Building modifications have been irstructed to pay particular attention to the provisions of Part 2, Plastic Design Methods, of the AILC Specification in order to prevent recurrence of a similar situation.

Therefore, in accordance with Procedure 9.1, resolution has been completed and corrective action taken.

V ry truly yo rs,

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V PIIILI/'A.

r CRAN, JR.

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