ML20113F616

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Forwards Recommended Piping Sys Damping Values & Recommended Cable Tray Support Damping, Describing Revised Damping Value Changes & Basis of 10CFR50.59 Evaluation Re Discrepancies in Analysis of Floor Response Spectra
ML20113F616
Person / Time
Site: Hatch  Southern Nuclear icon.png
Issue date: 01/16/1985
From: Gucwa L
GEORGIA POWER CO.
To: Stolz J
Office of Nuclear Reactor Regulation
Shared Package
ML20113F618 List:
References
NED-85-031, NED-85-31, NUDOCS 8501240077
Download: ML20113F616 (2)


Text

Georgta Power Company .

333 Piedmont Avenue

< Atlanta. Georg>a 30308 Telephone 404 S264526

. Mading Address:

Post Off!ce Box 4545 Atlanta, Georg a 30302 Georgia Power L. T. Gucwa the sounern ektnc systern Manager Nuclear Eng neenng and Chief Nuclear Eng:neer (

NED-85-031 \

January 16,1985f Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing

~ U. S. Nuclear Regulatory Comission

- Washington, D.C. 20555 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 EDWIN I. HATCH NUCLEAR PLANT - UNITS 1 AND 2 DISCREPANCIES IN-THE-ANALYSIS OF FLOOR RESPONSE-SPECTRA Gentlemen:

Pursuant to our letter NED-84-622, dated December 14, 1984, Georgia Power Company (GPC) provides the following information regarding the evaluation performed in' accordan:e with 10 CFR 50.59 of the- damping values' used in the seismic analyses of cable ' trays, supports, and piping for Plant Hatch.

.During the 10 CFR 21 evaluation of discrepancies- in .the floor response spectra at Plant Hatch Units 1 and 2, higher: damping values than

. presently stated in the FSAR were used'to evaluate cable trays, supports, and piping. In order to demonstrate compliance with the FSAR, GPC- has performed a preliminary 10 CFR 50.59. evaluation which justifies ' use of-these higher damping values.- The final evaluation is pending approval by, the. Plant ' Review Board. A- description of the revised damping value changes and the- basis of the preliminary 50.59 evaluation are given in the' attachments. As indicated these damping value changes ,do- not constitute an unreviewed safety question per the criteria of 10 CFR 50.59.

8501240077 850116 PDR-ADOCK- 05000321 s_ S; _ PDR ._

4ooI ili

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LGeorgiaPowerA Director of Nuclear Reactor Regulation U. S.- Nuclear Regulatory Commission

' Washington, D.C. 20555

-January-16, 1985 o Page 2-Following the final 50.59 evaluation, GPC intends to revise the Plant Hatch Unit I and Unit 2 FSAR to permit the use - of the_ damping values shownsin the attachments. Use of these values will be restricted to new and : replacement systems and load reconciliation. Additional systems analysis regarding the broadening of seismic response spectra will not be performed.

- Please. contact this office if there are any questions related to this material.

Very truly yours,

/ T ^ - t_ =_

L. T. Gucwa LTG/c1h Enclosure cc: -J. T. Beckham, Jr.

H.:C. Nix, Jr.

J. P . O'Reilly (NRC-Region II)

Senior Resident Inspector J

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