ML19209A023

Final Rept of Deficiency 78/05 Re Structural Steel Deficiency in Auxiliary Bldg.Corrective Actions:Structural Steel Plans Have Been Corrected to Meet Load Criteria for Beams & Girders

ML19209A023
Person / Time
Site:	Grand Gulf
Issue date:	09/11/1978
From:	MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML19209A024	List: ML19209A023
References
NUDOCS 7910010799
Download: ML19209A023 (1)

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Helping B uild Mis sis sippi

=4 P. O. BOX 1G40, JACKSON, MISSijSIPPI 39205 r a o o u c t i o ~ o c e a u m o. ' September 11, 1978 -,

Office of Inspection and Enforcement ~

U. S. Nuclear Regulatory Commission -

Region II - Suit e 1217 230 Peachtree Street, N.W. I -l Atlanta, Georgia 30303 ,

Attention: Mr. J. P. O' Re illy, Di ree tor

SUBJECT:

Grand Gulf Nuclear St ation File 0260/0498/15525/15526 Final Report of PRD 78/05 As Defined in 10CFR50.55(e)

AECM-78/72 On August 11, 1978,tlississippi Power 6 Light Conpany notified 11r. J. C. Bryant of your office of a potential reporta'le deficiency concerning the structural steel design of the Unit 1 Aaxiliary Building at the Grand Gulf Nuclear Station construction site. We have now determined that this is a reportabic deficiency within the neaning of 10C FR50. 55 (e) (1) (i i) . Details of this natter, including cor>ective commitments, are described in the attached final report.

Yours truly, T.-f ,$ 1 L-

[hr J. P. McCaughy, Jr.

Director of Power Production J RF/ LFD:dwe Attachment cc. Mr. N. L. Stampley i:r . R. B. ftcGehee Mr. T. B. Conner Dr. Ernst Vo l c,,e n a u , Director 41tils COPY f0R Division of Inspection 6 En forcement ,

U. S. Nuclear Regulatory Commission Washington, D. C. 20555 791 ? 127 l 7 910 010 79T g I

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rv v w c Member Middle South Utilities System ,

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FINAL 1;l:l' ORT AUXILIARY BUILDING DESIGN DEFICIENCY PRD NO. 78/05 I. Description of the deficiency:

I n 11a y , 1977, during a review of the design calculations for the structural steel floor framing at Elevation 103'-0" in areas 7,8,9 and 10 of the Unit I Auxiliary Building and in areas 19, 20, 21 and 22 of the Unit 11 Auxiliary Fu f1 ding, a deficiency was found in t he design criteria used. In each building at this elevation, the floor framing is used for the support of a service or naintenance platform consisting of galvanized bolted 3; rat ing. This grating can be renoved in sections to gain access to piping and other systems below the platform. The design criteria used allowed the renovable grating to provide lateral bracing of the beams and girders supporting each platform. Additlonally, the design criteria did not allow for loads on the support heans and girders which would be inposed by numerous piping systems or utflitles suspended from each platform.

II. Safety Implications:

This deficiency is reportable within the meaning of 10CFR50.55(e)(1)(ii) because it constituted a significant deficiency in the design released for const ruct ion such that the design did not conform to the design criteria on which the construction permit was based.

III. Corrective Action Taken:

The corrected design criteria provided for loads which would be imposed on the support heams and girders. The structural steel framing plans for the l' 1 platform were corrected and issued for rework in August, 1977. The structural steel framing plans for the Unit 2 plat forn were rcdesigncd to be n. accord with the outsetted design criteria and issued for construction in June, 1977.

Details of the corrective action taken for this deficiency and documentation regarding action taken to prevent recurrence will be documented in Bechtel's Management Corrective Action Report (!1 CAR)

No. GGNS-40, which is available for your review at the GGNS construction site.

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