ML19296B642

Interim Deficiency Rept Re Design & Const Deficiencies in Rock Anchor Design for Svc Bldg.Auxiliary & Turbine Bldgs Are Under Review.Final Rept Will Be Forwarded Prior to 800229

ML19296B642
Person / Time
Site:	Millstone
Issue date:	01/03/1980
From:	Counsil W NORTHEAST UTILITIES
To:
Shared Package
ML19296B634	List: ML19296B642
References
AEC-MP3-198, NUDOCS 8002210166
Download: ML19296B642 (2)

Text

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January 3, 1980 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 ATTENTION: Mr. B. H. Grier Docket No. 50-423 Director AEC-MP3-198 Gentlemen:

SUBJECT:

Millstone Unit No. 3 Reporting of Deficiencies in Design and Construction This letter provides written confirmation of phone conversations held with your Mr. A. Cerne on December 5, 1979 and December 19, 1979. We have determined that the problem as discussed below is reportable under 10CFR59.55(e)(1)(ii).

As reported to Mr. Cerne on December 5,1979, our Engineer Constructor for Millstone Unit No. 3, Stone & Webster Engineering Corporation, reported to NUSCO that a design error had been found in the rock anchor design for the Service Building. A faulty assumption as to building stiffness has led to an insufficient number of rock anchors being included in the design. While the Service Building is a QA Category III structure, the electrical tunnels passing through it and the abutting structures are QA Category I. A failure ng could affect these safety related structures. This of the Service, problem Build (d prior to site work in the affected area.

was identifie Our Engineer Constructor corrected'the design and the proper number of rock crchors were installed in the Service Building.

As further discussed with Mr. Cerne on December 19, 1979, a preliminary review has shown that the same problem may exist in the Auxiliary Building 8002210 !b

and Turbine Building. Stone & Webster is continuing their review of the Auxiliary Building and Turbine Building. NUSCO will send a final written report closing out this entire problem prior to February 29, 1980.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY s

AYAdidi William G. Counsil Vice President Nuclear Engineering & Operations cc: Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555