ML20050A918
| ML20050A918 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/29/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20050A919 | List: |
| References | |
| NUDOCS 8204020394 | |
| Download: ML20050A918 (2) | |
Text
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4 Consumers yJ. POW 8r James W Cook pqgg UUnsayussJ Vice President - Projects, Engineering and Construction General o f fices: 1945 West Parnell Road, Jackson, MI 49201. (517) 788 o453 March 29, 1982 A
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RECD 4VED Harold R Denton, Director
-9 Office of Nuclear Reactor Regulation APR 011982%
US Nuclear Regulatory Commission g ggg ue#rJutt tpAE8 * '
Washington, DC 20555 NMuh
'b MIDLAND PROJECT
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MIDLAND DOCKET NO 50-329, 50-330 iG SOIL DYNAMIC MODULUS STUDY FILE:
B2.5.4, B3.7 SERIAL:
16584 ENCLOSURE: DAMES AND MOORE REPORT: SOIL DYNAMIC MODULUS STUDY, MIDLAND UNITS 1 AND 2, MARCH 5, 1982 The dynamn soil modulus (Dynamic E) currently in use as a design basis for the Midlarul ?lant is given in Subsection 2.5.4.7.4 of the Midland Final Safety Analysis Report. This soil modulus value was recommended by Dames and Moore in 197d.
As part of the final design calculations and soils remedial work, we requested Dames and Moore to confirm the appropriateness of the originally recommended value for use in the seirmic analysis (OBE and SSE) of all the major Category I structures founded on the glacial till. Those major seismic Category I st.ructures include the reactor building, the auxiliary building and the service water pump structure.
The enclosed report from Dames and Moore responds to the above request. The report concludes that the dynamic modulus of elasticity value recommended in 1970 is still appropriate for the Midland Plant under OBE and SSE conditions and is applicable to all major seismic Category I st.ructures founded on glacial till, including the service water pump structure.
It is widely recognized that there can be variations in the derived soil dynamic values based on different measurement and analytical techniques.
Account for these types of differences was taken when Consumers Power Company used a t 50% parametric variation of the dynamic modulus during the design phase.
Differences in the soil modulus are also addressed in the Dames and Moore report. To futher account for these variations, we intend to use a range of soil modulus values as a part of the seismic margin review.
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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 PHadala, Army Corps of Engineers, w/a JHarbour, ASLB, w/o GHarstead, Harstead Engineering, w/a DSHood, NRC, w/a (2)
DFJudd, B&W, w/o JDKane, NRC, w/a FJKelley, Esq, w/o RBLandsman, NRC Region III, w/a WlIMarshall, w/o JPMatra, Naval Surface Weapons Center, w/a W0tto, Army Corps of Engineers, w/a WDPaton, Esq, w/o SJPoulos, Geotechnical Engineers, w/a FRinaldi, NRC, w/a HSingh, Army Corps of Engineers, w/a BStamiris, w/o l
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