ML20128F226

Forwards Response to NRC 930128 Request for Addl Info Re Methodology for Analysis of Primary Coolant Loops for Steam Generator Replacements

ML20128F226
Person / Time
Site:	Mcguire, Catawba, McGuire
Issue date:	02/03/1993
From:	Rehn D DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9302110308
Download: ML20128F226 (3)

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Duke h:wer Cen.pany.

IHAL B nXAEQ PO Box 1006

" &nior Vice Presider.t i 8 4; Chartv*tte, NC2E:01100C Nuclear Generation.

(IM)3824511

. DUKE POWER February 3,1993 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Subject.

McCuhe Nudeat Station Unite,112 Docket Nos. 50-369,370 Catawba Nuclear Station Unit 1 Docket No. 50 413 Request For Additiontd Information - Methodology for Analysis Of The Primary Cooltmt Loops For Steam Generator Replacement Gentlemen:

Per your Request for Additional Information dated January 28,1993, Involving the proposed methodology for the analysis of the primary loops at McGuire Units 1 & 2 and Catawba Unit'l for steam generator replacement,' please find attached Duke Power's response. As indicated in the response, Duke Power has decided that only the time ~ history method for the generation of floor response spectra will be used= for engineering work involved with the steam generator, replacement 1 Should there be any. questions concerning,this response, please contact David V.

Ethington at (704) 382-6633.

Very truly yours, D. L. Rehn, General Manager Nm 3ar Services.

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U. S. NRC

'I Page 2, February 3,1993 xc (w/att):'

S. D, Ebneter Regional Administrator, Region II T. A. Reed,- ONRR

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R. E. Martin, ONRR' P. K. Van Doorn-Senior Resident Inspector (MNS)

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Senior Resident Inspector (CNS)

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Request for Additional information :

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McGuire 1/2 and Catawba 1 Methodology for Analysis ~of Primary Coolant Loops for :

Steam Generator Replacement (SGR)

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e Backarnund Information

- In the May 17,1990 safety evaluatian report (SER) of the direct generation methodology (DGM) used for generating floor response spectra (FRS) for the snubber.

reduction program at Catawba 1 and 2, the NRC staff approved, after extensive discussions with Duke Power Company (DPC), the use of a composite ground response spectrum (GRS) as input for generating the FRS utilizing an appropriate DGM. In the same SER the staff also approved the use of a computer program called EDASP for DGM In response to a question raised by the staff during a teleconference on October 28,1992, DPC stated that it will generate the new FRS using either the time history method or the DGM as permitted in_ Section 3.7 of the FSAR.

Soecific Reauests for InformatiDD

1) DPC should clarify if it intends to use., in the SGR project at Catawba-1, the same composite GRS and the DGM that were approved for the snubber reduction program.

- at Catawba 1 and 2 in the May_17,1990 SER cited above; if not, DPC should furnish.

the detalls of the GRS and analysis procedure it will use for generating the FRS for the

- SGR project at Catawba 1. In order to expedite the resolution of this issue, DPC is advised to review all of its submittals and the staff's review comments and additional information requests 'on its application for the snubber reduction program at Catawba

- 1 and 2, and provide detailed information on the two related issues, namely, the GRS

- and the analysis procedure used.-

- 2) Similarly furnish the details of the GRS and_the analysis p_rocedure that will be used:

for the SGR project at McGuire-1_ and 2.

Resoonsa

.While DPC is licensed to use the DGM, as described in the May-17,1990 SER, at-_

l Catawba 1 and 2, all FRS that have been generated to date were created using the __

time history method. McGuire 1 and 2 have no approved composite GRS and are not-presently ticensed to use DGM for.FRS generation. A.ll McGuire FRS have been -

2 generated using the time history method as well.To maintain consistency between the two' plants and expedite licensing reviews for SGR, DPC has decided to continue to; 1

use the time history method for the generation of FRS for all engineering work involved:

with SGR.

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