ML20030E044

Forwards Amend to 810715 Supplementary Seismic Evaluation Rept (EF2-53,332,Revision 1) Re Reassessment of Buried Pipes & Duct Runs

ML20030E044
Person / Time
Site:	Fermi
Issue date:	09/11/1981
From:	Colbert W DETROIT EDISON CO.
To:	Kintner L Office of Nuclear Reactor Regulation
References
EF2---54-800, NUDOCS 8109170320
Download: ML20030E044 (2)

Text

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September 11, 1981 EF2 - 54,800 Mr. L. L. Kintner U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Washington, D. C. 20555

References:

Enrico Fermi Atomic Power Plant, Unit E NRC Docket No. 50-341

Subject:

Reassessment of Buried Pipes and Duct Runs As requested by the NRR Staff, we are providing an amendment to our Supplementary Seismic Evaluation Report (EF2-53,332, Revision 1, July 15, 1981).

An amended page 4-11 is attached.

Should you huve any questions, please contact Larry Schuerman at (313) 649-7562.

Sincerely, lfhC lot 'j W. F. Colbert Technical Director Enrico Fermi 2 WFC:jl Attachment cc:

Mr. B. Little df O

8109170320 810911 e

PDR ADOCK 05000341

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PDR-

1' Attachment to:

EF2 - 54 800 5

September 11, 1981 the Reference 4-1 for strong mction (a > 0.1 g) earthquakes recorded on firm ground.

I For the Fermi 2 site specific SSE, a ground particle velocity was determined to be 4 9 in/sec. for the N-S component and 4.5 in/sec for the E-W component.

These velocities were deter-I mined by integrating the ground acceleraton time histories in the N-S and E-W directions.

As larger ground particle velocities lead to higher stresses, the 7,2 in/sec. value used in the Fermi 2 buried pipe design is conservative.

1 4.5 References 4-1 Hall, W.

J.,

Mohraz, B.,

and Newmark, N.

M.,

Statistical Studies of Vertical and horizontal Earthquake _ Spectra Report NUREG-0003, January 1976 2

for the U. S. Nuclear Regulatory Commission, i

Washington, D. C.

4 1

i 4-11 Amended September 11, 1981

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