ML20205P774

Forwards Request for Addl Info Re Direct Generation Response Spectra & Snubber Reduction Program

ML20205P774
Person / Time
Site:	Catawba
Issue date:	11/04/1988
From:	Jabbour K Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
TAC-67359, TAC-67360, NUDOCS 8811080288
Download: ML20205P774 (3)

Text

-_ _ _ _ _ _ _ _

l Novc bor 4, 1988 i

Docket Nos.: 50-413 50-414 Mr. H. B. Tucker, Vice Preside:

• Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE DIRECT GENERATION RESPONSE SPECTRA AND THE SNUBBER REDUCTION PROGRAM - CATAWBA NUCLEAR STATION, UNITS 1 AND 2 (TACS 67359/67360)

On October 18, 1988, the staff held a conference call with members of Duke Power Company to request additional information regarding the above subject.

This request was based on the review of your submittal dated September 16, 1988.

The additional information requested is identified in the enclosure.

Your response to the enclosure is requested as soon as possible. Contact me at (301)492-1496 if you have any questions.

The reporting and/or recordkeeping requirerents contained in this letter affect fewer than ten respondents; therefore OMB clearance is not required under P. L.96-511.

Sincerely, originally Signed By:

Kahten N. Jabbour, Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation

Enclosure:

As stated cc: See next page DISTRIBUTION N NRC POR Local PDR PDII-3 Reading S. Varga 14-E-4 G. Laines 14-H-3 D. Matthews 14-H-25 M. Rood 14-H-25 K. Jabbour 14-H-25 OGC 15-B-18 E. Jordan MNBB-3302 B. Grires 9-A-2 G. Bagcht 8-D-22 M. Hartzr.an 9-H-3 ACRS (10) P-315 D. Jeng 8-D-22 CATAWBA PLANT FILE P. Kuo 9-H-3 H. Ashar yy a[/W 8-D-22 fDk D K 13 P PNU gj 'gi I I

33 d

PDII-3 KJabbour:sw

$ Y/EMEB P. Kuo ES /E B

. Bagcht

.k ltth ws Of y/o)/88 j)/j/88 lt / l /88 gg / /88 \

/0/f/88

m 3

t ,

Mr. H. B. Tucker Duke Power Company Catawba Nuclear Station CC:

A.V. Carr, Esq. North Carolina Electric Mod ership Duke Power Company Corp.

422 South Church Street 3400 Sumner Boulevard Charlotte, North Carolina 28242 P.O. Box 27306 J. Michael McGarry,111. Esq.

Bishop. Liberman, Cook, Purcell Saluda River Electric Cooperative, and Reynolds IRC.

1200 Seventeenth Street, N.W. P.O. Box 929 Washington, D. C. 20036 Laurens, South Carolina 29360 North Carolina MPA-1 Senior Resident Inspector Suite 600 Route 2, Box 179N 3100 Smoketree Ct. York, South Carolina 29745 P.O. Box 29513 Raleigh, North Carolina 27626-0513 Regional Administrator, Region !!

U.S. Nuclear Regulatory Commission S. S. Kilborn 101 Marietta Street, NW, Suite 2900 Area Manager, Mid-South Area Atlanta, Georgia 30323 ESSD Projects Westinghouse Electric Corp. Mr. Heyward G. Shealy, Chief P.NC West Tower - Bay 239 Bureau of Radiological Health P.O. Box 355 South Carolina Department of Health Pittsburgh, Pennsylvania 15230 and Environmental Control 2600 Bull Street County Manager of York Ceunty Colusia, South Carolina 29201 York County Courthouse York, South Carolina 29745 Karen E. Long Assistant Attorney General Richard P. Wilson, Esq. N.C. Department of Justice Assistant Attorney General P.O. Box 629 S.C. Attorney General's Office Raleigh, North Carolina 27602 P.O. Box 11549 Colue ia South Carolina 29211 Mr. Peter G. LeRoy Nuclear Production Department Piedmont Municipal Power Agency Duke Power Company 100 Memorial Drive P.O. Box 33189 Greer, South Carolina 29651, Charlotte, North Carolina 2B241 Mr. Michael Hirsch Federal Emergency Management Agency Office of the General Counsel Room 840 500 C Street, S.W.

Wasnington, D. C. 20472

s ...

i ,

ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE CATAWBA NUCLEAR STATION, UNITS 1 AND 2 l DIRECT GENERATION RESPONSE SPECTRA

1. Provide the ground response spectrum values used to generate floor response spectra for your snubber reduction analyses. These values may be presented l in a tabular form or as a graph.

2. Justify the adequancy of Ground Response Spectra (GRS) utilized for the  !

Direct Generation of floor spectra. One acceptable method would be to satisfy the following criteria: <

l (a) The floor response spectra generated using the GRS should not be less l than905(atnomorethanfivepoints)ofthespectraobtainedusing site-specific spectra. This comparison should be provided for all

floors where snubber reduction is proposed.

(b) The energy content of the GR$ as represented by Power Spectral Density i Function (PSDF) should not be lower (on an avarage basis) than that of l Kanai-Tajimi PSDF provided in NUREG/CR 3509 l

3. For the systems indicated in your Septeder 16, 1988, submittal, provide the following: (a) total nud er of existing snubbers per system, and (b) building and floor elevations where the system supports are located. .

t

4. Supplement Table 1 with loads ganerated using: (a) site specific spectra.  !

l (b) design response speccra, and (c) actual support design. '

5. Tables using P81 earthquake input show a nuder of exceedances of time-history resporses at critical frequencies, particularly at low damping. Discuss these i exceedances and the possibility that EDASP can be modified to cor*ect such exce4 dances, j

6.

Provideatableofloadsonsystemsupportsforthefollowing)

(a) before snubber removal, (b) after snubber removal, andcases

• factors (e, safety  ;

against allowable stresses for (a) and (b). j

7. Verify that the supports, restraints and anchors in the systems listed in the letter of Septed er 16, 1988, have been qualified based on l the revised FSAR Table titled "Loading Conditions, load Codinations, 2'.d '

Allowable Stresses for Supports, Restraints and Anchors, Duke Classes A, B, C, and F," enclosed with the letter, c I

1 l