ML20195E268
| ML20195E268 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/01/1988 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8811070323 | |
| Download: ML20195E268 (14) | |
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. November'1, 19'88-I Document Control Desk U. S. Nuclear Regulatory Conunission Washington, D. C.
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Catayba Nuclear Station-
Subject:
Docket Nos. 50-413 and 50-414 Direct Generation Resporae Spectra Gentlemen:
I The attachments, to our November 27, 1988 letter concerning the same subject, were in error. Our response and the corrected attachments are attached. We apologize for this inconvenience.
Very truly yours, 3
Hal B. Tucker PGL/
j.
Attachment xes:(w/o attachments )
M. L. Ernst, Acting Regional Administrator
- 11. S. Nuclear Regulatory Commission Region II-101 Marietta Street, NW, Suite 2900
'At.lanta, Georgia 30323 Mr. W. T. Orders NRC Resident Inspector Catawba Nuclear Station i
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A comparison will be made of results from the direct generation method, time history method and actual earthquake records. The Perry containment will be considered as a representative structure if the necessary recorded seismic event results for the comparison are available.
Response
Information was received on the Perry containment stick model from Gilbert /Comonwealth, Inc. and the base mat recorded time histories from Stevenson & Associates. This information was used to perform an analysis similar to the one performed in Appendix A, paragraph A.2.1 of Reference 1.
In that section, Gilbert /Comonwealth compared their analytical response spectra at elevation 688'+ 6" of the Perry containment stick model with the recorded response spectra at elevation 686'. Figures A.1 through A.6 (copies attached) show the results.
The Perry containment model (natural frequencies, mode shapes, & nodal masses) was entered into EDASP and the base mit time histories were applied to the model.
Response spectra in each direction were computed at the base of the model and at elevation 686'+6" of the containment using time history analysis. The results of this and the Gilbert time history analysis were compared as a baseline check of the input timo history and containment model.
Figures 1 through 3 show the base mat iesponse spectra along with the elevated (elevation 688'+ 6") spectra computed by Gilbert /Comonwealth (from Figures A.4, A.5, & A.6) and the elevated spectra computed by Duke Power using time history analysis. The base mat spectra compared well with the recorded base spectra shown in Figures A.1, A.2, & A.3.
The elevated response spectra also compared well, showing similar frequency content and only slightly different peak responses.
These comparisons showed that we were using the same base time histories and containment model as Gilbert.
Base Power Spectral Densities were computed from the base response spectra shown in Figures 1 through 3.
The PSD's were then applied to the containment model and response spectra were computed at elevation 686'+
6".
Figures 4 through 6 show plots of the elevated recorded response spectra (from Figures A.1, A.2, & A.3), the Gilbert /Comonwealth time history generated response spectra (from Figures A.4, A.5, & A.6), and the Duke Power PSD generated response spectra. These figures show that the PSD generated results compare at least as well as the time history results to the recorded spectra. This is in agreement with our previous submittals which showed that the PSD technique compared favorably with timo history techniques.
References:
1)
The Cleveland Electric Illuminating Company perry power Plant Confirmatory Program of the January 31, 1986 Ohio Earthquake Effect, Gilbert /Comonwealth Report No. 2632, June 16,1986, Docket Nos.
50-440; 50-441
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