ML20040H421

Potential Significant Deficiency Rept Re Design of Svc & Auxiliary Bldgs,Initially Reported on 810421.Revised Drawings Reflecting Final Design of Auxiliary Bldg Encl

ML20040H421
Person / Time
Site:	Millstone
Issue date:	02/02/1982
From:	Cagnetta J, Counsil W NORTHEAST UTILITIES
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, AEC-MP3-265, B10406, F0027A, F27A, NUDOCS 8202180236
Download: ML20040H421 (7)

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NORTHEAST IFI1BJTIES COi%TICC~ EnTYonE CONNECTICUT 06101

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February 2, 1982 Docket No. 50-423 -

AEC-MP3-265 @ q, B10406 F0027A #/ 3 RECElven Mr. Ronald C. Haynes I982b h Region I Office of Inspection and Enforcement

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g U. S. Nuclear Regulatory Commission 631 Park Avenue 4 d' King of Prussia, PA 19406

References:

(1) W. G. Counsil letter to R. T. Carlson, Reporting of a Potential Significant Deficiency in the Design of the Service Building and Auxiliary Building, dated April 21, 1981.

(2) W. G. Counsil letter to B. H. Grier, Final Report; Potential Significant Deficiency in the Service and Auxiliary Building, dated July 30, 1980.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 3, Revision to Reference (1); Reporting of a .

Potential Significant Deficiency in the Design of the Service Building and Auxiliary Building Reference (1) provided further detail to Reference (2) on the problems encountered and the corrective repairs and administrative actions taken to prevent reoccurrence of the reported deficiencies. As a result of questions raised during an I & E Inspection at Stone & Webster's Boston office on January 13, 14, and 15, the following revised information concerning the Auxiliary Building is being forwarded. The revisions presented reflect the final design and are illustrated on Figures 1-4, attached.

The description of these revisions follows:

Figure 1 Additional Columns between elevation 4'-6" and ?4'-6".

o Four I-Section columns are shown instead of the three square columns originally shown. The use of steel columns was decided upon instead of reinforced concrete. At one location an interface required the use of two columns in-stead of one.

8202180236 820202 PDR ADOCK 05000423 g hg S PDR 6th( _j

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o Between 48.5 and 49.5, lines F and F.3, there are additional walls shown with access openings. These were found structurally necessary.

Figure 2 Elevation 24'-6" to 43'-6" o Between 52.3 and 53.3, lines F.3 and F.7 the final columns used were steel sections. Originally only square columns were in-dicated.

o Between 51.3 and 53.3, close to F.3 line, structural considerations required the addition of a reinforced concrete haunch.

Figure 3 Elevation 43'-6", wall along F.8 line o Wall access openings were added as shown.

Figure 4 Elevation 4'-6", locaton of rock anchors o The individual locations shown represent the actual modifications made.

We trust that the above revision to Reference (1) responds to those questions you may have had concerning our modifications to the Auxiliary Building.

Very truly yours, MILLSTONE NUCLEAR POWER COMPANY f

W. G. Counsil Senior Vice President b

By: f.Cagnettg Vice esident Nuczear and Environmental Engineering cc: Mr. James 11. Sniezek, Director Division of Resident and Regional Reactor Inspection Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555

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Docket No. 50-423

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1 Millstone Nuclear Power Station, Unit No. 3 Figures 1-4 Auxiliary Building Revisions I-i February, 1982 l

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