ML20038C280

Forwards Addendum to Technical Rept on Underpinning Auxiliary Bldg & Feedwater Isolation Valve Pits, Submitted on 810930.Addendum Contains Info on Soil Pressure Data & Load Combinations Used for Preliminary Design

ML20038C280
Person / Time
Site:	Midland
Issue date:	12/03/1981
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20038C281	List: ML20038C280 ML20038C282
References
NUDOCS 8112100356
Download: ML20038C280 (2)

Text

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C0030m8FS POW 8f James W Cook C0 mpg u Y Vice 14esident - I4ojects, f.'ngineering and Construction General of fices: 1945 West Parnall Road, Jackson, MI 49201 e (517) 788 0453 December 3, 1981

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Harold R Denton, Director 2 44,% ISS/s r3-Office of Nuclear Reactor Regulation

{, . %k'gWeg US Nuclear Regulatory Commission Washington, DC 20555 9 MIDLAND PROJECT MIDLAND DOCKET NOS 50-329, 50-330 UNDERPINNING OF THE AUXILIARY BUILDING - CALCULATIONAL RESULTS FILE 0485.16, B3.0.1 SERIAL 14899

REFERENCE:

JWCOOK TO HRDENTON, SERIAL 14110, DATED SEPTEMBER 30, 1981 p ENCLOSURE: ADDENDUM TO TECHNICAL REPORT ON UNDERPINNING THE AUXILIARY BUILDING AND FEEDWATER ISOLATION VALVE PITS Attached to the above-referenced correspondence of September 30, 1981, we submitted a design report entitled, " Technical Report on Underpinning the Auxiliary Building and Feedwater Isolation Valve Pits." We are providing as an enclosure to this correspondence twenty-five (25) copies of an addendum to the above-referenced technical report.

The purpose of the enclosed addendum is to supplement Section 7.5 of the above-referenced technical report and Appendix A of the same document. The enclosed addendum contains the following information:

1. Soil pressure data under the auxiliary building and the feedwater isolation valve pits underpinning area.

2. Load combinations used for preliminary design of the underpinning reinforcement walls and the connection joints of the underpinning walls to the auxiliary building.

3. Design forces and moments at the critical sections.

4. Reinforcement details provided in the underpinning walls.

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5. A summary of results from recent preliminary auxiliary building structural analyses which reflect the modified dynamic model of the structure, actual natural soils properties and the proposed underpinnings. These results identify certain areas within the structure which may require some modification in order to meet design requirements. As further analyses are completed, we will forward our proposed plans for any additional '

remedial actions to the Staff for their review and concurrence.

The material presented in this addendum is based on preliminary analyses of the permanent underpinning configuration. Detailed calculational checks will be performed as a part of the final analysis to verify the design adequacy.

We are also currently performing analyses and design checks for the auxiliary building construction condition for various construction stages. The results of these detailed design checks for both the permanent underpinning configuration and the construction condition will be available to the NRC Staff for their audit in accordance with agreements reached at our November 17, 1981 meeting in Bethesda.

This addendum along with our previous submittals and discussions with the NRC Staff should adequately respond to the concerns identified by the Staff. We believe this information continues to support our conclusion that the design of the auxiliary building and feedwater isolation valve pit structures combined with the proposed underpinning remedial actions are adequate and appropriate for these structures.

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CC Atomic Safety and Licensing Appeal Board, w/o CBechhoefer, ASLB, w/o MMCherry, Esq, w/o FPCowan, ASLB, w/o RJCook, Midland Resident Inspector, w/o RSDecker, ASLB, w/o SGadler, w/o JHarbour, ASLB, w/o DSHood, NRC, w/a (2)

DFJudd, B&W, w/o JDKane, NRC, w/a FJKelley, Esq, w/o RELandsman, NRC Region III, w/a WlIMarshall, Esq, w/o JPMatra, Naval Surface Weapons Center, w/a W0tto, Army Corps of Engineers, w/a WDPaton, Esq, w/o FRinaldi, NRC, w/a HSingh, Army Corps of Engineers, w/a BStamiris, w/o oc1181-0495a100 l

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