ML20085D801
| ML20085D801 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 07/22/1983 |
| From: | Buckman F CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20085D803 | List: |
| References | |
| 23861, NUDOCS 8307290113 | |
| Download: ML20085D801 (3) | |
Text
I 9
Consuinets power Fr d ' =
- a==*- -
Executive Atanager AfiJland Project Office General Of fices: 1945 West Parnell Road, Jackson, MI 49201 * (517) 788 1933 July 22, 1983 Harold R Denton, Director Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND ENERGY CENTER MIDLAND DOCKET HOS 50-329, 50-330 SEISMIC MARGIN REVIEW REPORT FILE:
B3.7.1 SERIAL: 23861 ENCLOSURE: VOLUME III - AUXILIARY BUILDING (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 III, dealing with the evaluation of the Seismic Margins in the Auxiliary Building is submitted for the Staff's review as an attachment to this letter.
Volume III of the Seismic Margin Review Report titled, " Auxiliary Building" describes in detail the method of analysis and the resulting seismic margins.
The underpinning walls of the Electrical Penetration Areas (EPA) and the Control Tower were included in this evaluation for their margins. A wide range of relative soil stiffnesses between the main Auxiliary Building and the EPA were considered in the margin evaluation.
In spite of the wide range of soils stiffnesses mentioned above, 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 1.6 with respect to code allowables. The lowest margin identified in the rest of the structure was conservatively estimated at 1.2 with respect to code allowables.
8307290113 830722 DR ADOCK 05000329 fQi b-i oc0783-0516a100
o 2
Future volumes of the Seismic Margin Review Report dealing with structures and systems will be submitted as they become available.
bittb $
N 4
IVB/BFH/bjb CC RJCock, Midland Resident Inspector JGKeppler, Admittistrator, NRC Region III DSHood, NRC FRinaldi, NRC GHarstead, Harstead Engineering i
i l
1 1
i I
oc0783-0516a100
-,-.,~,,n-n,.--r,
,,c
--,,-,m,,-
,-,-r,ne,-n--,
,. ~,...
---,e, mew
,-,-.,g,
,cw-,,e
e CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329, 50-330 Letter Serial 23861 Dated July 22, 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 III of the Seismic Margin Review titled " Auxiliary Building".
CONSUMERS POWER COMPANY Y
Jue
'F W Buckman, Executive Manage Midland Project Office Sworn and subscribed before me this h ay of b
/f8 0d' dn3u }h
't.J Notff Public //#
Jackson County, Michigan My Commission Expires h
f /7k j
oc0783-0516a100
SMA 13701.05R003(VOLUME III)
SEISMIC MARGIN REVIEW VOLUME III AUXILIARY BUILDING
(
(
prepared for CONSUMERS POWER COMPANY Jackson, Michigan r
L June, 1983 b
{
g STRUCTURAL mECHAAICS
"""""""* A S S O CI A T ES I
WM a cene. coe, 5160 Brch Street, Newport Beach, Caltf. 92660 (714) 833-7552
_ _ _ _ _ _ _ _ _ _ _ ___