ML20073P435
| ML20073P435 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 04/18/1983 |
| From: | Wuller G ILLINOIS POWER CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| 0982-L, 982-L, U-0633, U-633, NUDOCS 8304250201 | |
| Download: ML20073P435 (3) | |
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0982-L f30_0hzng_3gy_g ILLINDIS POWER COMPANY y)y g
500 SOUTH 27TH STREET, DECATUR, ILLINolS 62525 Docket No. 50-461 April 18, 1983 Director of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Schwencer:
Subject:
Clinton Power Station Unit 1 SER Outstanding Issue #3 (NUREG-0853)
Reference:
IP letter U-0628, dated April 5, 1983, G. E. Wuller to A. Schwencer, NRC As requested by NRC in the telephone conversation with Illinois Power Company and Sargent & Lundy on April 11, attached is a copy of the revised spectra plots, incorporating the theoretical 84th percentile ground spectrum for upper-bound soil properties.
The methodology to obtain this ground spectrum is the same as described in steps 2 through 5 of the referenced letter, except that the mean plus sigma values listed in Table 6 of the referenced letter for upper-bound soil properties have been used as requested by the NRC Staff.
As can be seen from the attached figure, the new ground surface spectrum is enveloped by the design basis time-history spectrum for all frequencies, except in the narrow range of 1.1 to 1.6 hertz.
Since there 800I C304250201 830418 PDR ADOCK 05000461 E
0982-L U-0633 L30-83(04-18)-L April 18, 1983 Page 2 are no structural frequencies in this range, our
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judgment is that the Clinton plant design is not impacted by this narrow exceedance.
We propose that discussion of the revised saectra be included in the upcoming meeting at Bet'aesda on April 28 for
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resolution of SER outstanding issue #3.
Sincerely, G. E. Wuller Supervisor-Licensing Nuclear Station Engineering GEW/lt
- attach, cc:
Dr. H. Abelson, NRC Clinton Project Manager Mr. G. V. Giese-Koch, NRC GB Mr. B. N. Jagannath, NRC HGEB M. N. C. Chokshi, NRC SEB r
Mr. A. J. H. Lee, NRC EQB Mr. D. Terao, NRC MEB Mr. H. H. Livermore, NRC Resident Inspector Illinois Department of Nuclear Safety i
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Design Basis Time 8
History Spectra j
(0.29, 5% Damping)
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Theoretical Spectra Considering Soil Ampli-fication (5% Damping, Ref. 2, Fig. 37) to-'
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Theoretical 84% Percentile Spectrum for Upper-bound Soil Properties Considering Soil Amplification, 5%
Damping 10-2 10-'
100 10' PERIOD (SEC)
Figure 1: Comparison of Design Basis Design Time History Spectrum to Theoretical Spectra Considering Soil Amplification
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