ML20113F616
| ML20113F616 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| 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
c LGeorgiaPowerA
~
Director of Nuclear Reactor Regulation U. S.- Nuclear Regulatory Commission
' Washington, D.C.
20555
-January-16, 1985 Page 2-o 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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