ML20101E538

Forwards Summary of Reviews & Analyses Performed for Part 21 Evaluation Re Floor Response Spectra Peak Broadening for Ei Hatch Nuclear Plant Units 1 & 2, Per Agreement Reached at 841116 Meeting

ML20101E538
Person / Time
Site:	Hatch
Issue date:	12/14/1984
From:	Gucwa L GEORGIA POWER CO.
To:	Stolz J Office of Nuclear Reactor Regulation
Shared Package
ML20101E541	List: ML20101E538 ML20101E552
References
REF-PT21-84-552-000 NED-84-622, PT21-84-552, PT21-84-552-000, NUDOCS 8412260288
Download: ML20101E538 (2)

Text

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~ Georgia Power Company 333 Piedmont Avenue -'

Atlanta, Georgia 30308 Telephone 404 526-6526 Maiting Address:

" J Post Office Boa 4545 -

' Atlanta, Georgia 30302 Georgia Pbwer L. T. Gucwa the sourlem tArtrc sysiem

- ; Manager t4aclear Engineering

~

and Chief Nuclear Englneer NED-84-622 December 14, 1984

/ Director.of Nuclear Reactor Regulation

.. Attention:~ Mr. John F. Stolz.. Chief-

. Operating Reactors Branch No. 4

- - Division.of. Licensing .

LU. S. Nuclear Regulatory Comission

. Washington, D. C. 20555 NRC 00CKETS50-321, 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:-

As recently requested in our November. 16, 1984, meeting with the staff

.of ithe Nuclear' Regulatory Commission, Georgia - Power Company (GPC) herein 1 submits' a report outlining the various . analyses .. and reviews that were

. performed during the 10.CFR Part 21 evaluation for apparent discrepancies in

'the floor response spectra developed for Plant Hatch.

GPC informed the NRC Regional Administrator of this- concern and the

-progress made during this evaluation in a series; of letters: NED-84-008, NED-84-066, NED-84-274,. and NED-84-484 dated January 6,1984; February 10 1984;LMay 24, 1984;. and September 12, 1984, respectively. Additionally, GPC presented an overview of the analyses performed for this evaluation to the NRC in our meeting with the staff on ' November-16,1984. We reiterate that

- this . condition was discovered during tne course of the Plant Hatch-Unit 2 recirculation Lpipe replacement program. A team of engineers and consultants was assembled to evaluate this concern as soon as it was reported to us.- We have reviewed the technical specifications and have determined that no known technical' specification violations exist.

-GPC also comissioned an independent audit of the design comitments contained in the Unit 1 and 2 FSAR4 This - audit . sampled design comitments 1.and methodologies that are referenced in the FSAR and compared them to actual plant design. Preliminary information from this audit indicates that

'other commitments in tne FSARs were met.

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Georgia Power Director of Nuclear Reactor Regulation

' Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 December 14, 1984 Page Two Enclosed is'a copy of our summary of the evaluation and selected peak broadening ct.. ves. The detail of this - information is consistent with the

, agreement. reached during the meeting with the staff on November 16, 1984.

It is now GPC's intent to . perform a separate evaluation per the

~ criteria of 10 CFR 50.59. This evaluation will focus on the utilization of

~ revised damping values for cable tray and piping._ . The evaluation, with appropriate technical justification,' will be sumbitted for your information on or about January 15, 1985. If this evaluation indicates that there are .

no unreviewed safety questions, additional system analyses 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,

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L. T. Gucwa PAH/mb:

i Enclosure xc: J. T. Beckham,.Jr.

H. C. Nix, Jr..

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

Senior Resident Inspector i P. D. Rice c:

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