ML20080E784

Forwards Vol IV to Seismic Margin Review:Svc Water Pump Structure Margin Evaluation

ML20080E784
Person / Time
Site:	Midland
Issue date:	09/02/1983
From:	Buckman F CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20080E786	List: ML20080E784 ML20080E788
References
25494, NUDOCS 8309140079
Download: ML20080E784 (4)

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.. 1 Consumes Frederick W Buckman Executive Atanager Asidland Project Offico General Offices: 1945 West Pernell Road, Jackson, MI 49201 * (51M 788-1933 September 2, 1983 s g

Harold R Denton, Director Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND ENERGY CENTER MIDLAND DOCKET NOS 50-329, 50-330 SEISMIC MARGIN REVIEW REPORT FILE: B3.7.1 SERIAL: 25494

' ENCLOSURE: VOLUME IV - SERVICE WATER PUMP STRUCTURE (25 COPIES)

REFERENCE:

LETTER FROM J W COOK TO H R DENTON SERIAL 21010, DATED FEBRUARY 4, 1983

'As an attachment to our letter, Serial 21010, dated February 4, 1983, we submitted the criteria for the Seismic Margin Review, Volume I, for the Staff's review and it was subsequently discussed in a meeting on February 8, 1983 in Bethesda. The firm of Structural Mechanics Associates (SMA) of Newport Beach, CA, under the direction of Dr R P Kennedy, was assigned the task of performing the Seismic Margin Review per the criteria in Volume I.

Volume IV,- dealing with the evaluation of.the Seismic Margins in the Service

' Water _ Pump Structure (SWPS) is submitted for the Staff's review as an attachment to this letter.

Volume IV of the Seismic Margin Review Report titled, " Service Water Pump Structure" describes in detail the method of analysis and the resulting seismic margins.- The underpinning walls of the SWPS were included in this evaluation for their margins. This evaluation shows that there is still a considerable amount of margin in the design. The lowest margin identified for the underpinning walls was conservatively estimated at 3.7 with respect to code allowables. The lowest margin identified in the rest of the structure was conservatively estimated at 1.6 with respect to code allowables.

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' . 2 Future volumes.of the Seismic. Margin Review Report dealing with~ structures and

.,_ systems will be submitted as they become available.

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CC. RJCook, Midland Resident Inspector JGKeppler, Administrator, NRC Region III

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PJGriffin, P-24-513 . .

.NRC Correspondence File, P-24-517 LGraber,-LIS,

FRHand, P-14-417

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'Dr R P Kennedy,.SMA-TRThiruveng'a dam, P-14-400

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,.o CONSUMERS POWER COMPANY Midland Units 1 and 2  ;

Docket No 50-329, 50-330 Letter Serial 25494~ Dated September 2, 1983 At-the request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy Reorganization Act of 1974, as amended and the Commission's Rules and Regulations thereunder, Consumers Power Company submits

' Volume IV of the Seismic Margin Review titled " Service Water Pump Structure".

CONSUMERS POWER COMPANY 2 1 A~ _ _ _ ___. =A T W Buckman, Executive Manager Midland Project 0ffice Sworn and subscribed before me this M , day of bs Mb AAv11$A,Y..  ! ALJ Rota$ Psblic///

-Jackson County, Michigan My Commission Expires .b_ ,f)I, f,, 8 3-oc0883-0579a100-r

SMA13701.05R003(VOLUMEIV) 1 l

SEISMIC MARGIN REVIEW i

VOLUME IV SERVICE WATER PUMP STRUCTURE MARGIN EVALUATION I .

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l prepared for CONSUMERS POWER COMPANY Jackson, Michigan August, 1983 1

g g STRUCTURAL g mECHR0lCS B """"""" RSSOCIRTES T A CeHf. Corp.

5160 Birch Street, Newport Beach, CaPf. 02660 (714) 833 7552 4 _