ML17300A524

Forwards Supplemental Rept on Evaluation of Masonry Walls For..., in Response to NRC Concerns Re Ability of Walls to Withstand OBE & Sse.Confirmatory Analyses Support Time History Results Demonstrating Adequacy of Walls

ML17300A524
Person / Time
Site:	Palo Verde
Issue date:	09/19/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Knighton G Office of Nuclear Reactor Regulation
Shared Package
ML17300A525	List: ML17300A524 ML17300A530 ML17300A532
References
ANPP-38366-JGH, TAC-60773, NUDOCS 8609240092
Download: ML17300A524 (10)

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ACCEBSIQN N8R: 8609240092 DOC. DATE: 86/09/i9 NOTARIZED: NO DOC NET,,O FACIL: BTN-50-528 Palo Vev'de Nuclear Station> Unit 1> Av'i zona Publi 05000528 CSTN-50-52'P Palo Verde Nucleav Station> Unit 2> Arizona. Publi 0 5000529'5000530 STN-50-530 Palo Vev de Nuclear Station> Unit 3> Av izona Publi AUTH. NAl']E AUTHOR AFFILIATION HAYNES, J. G. Arizona Nucleav Powev Pv o Ject ( formerly *v i zona Public Sev v RECIP. NANE RECIPIENT AFFILIATION KNIGHTQN> G. N. PNR Pv object Div ectov ate 7

SUBJECT:

Fov wav'ds "Supplemental Rept on Eval uati on of Nasonarg Walls por. ~

" in response to NRC concerns re abilitp op nails to withstand OBE ~c SSE. Conf iv matorg analyses suppov t time

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history v esults demonstv ating adequacy of walls.

DISTRIBUTION CODE: BOEID COPIES RECEIVED: LTR i ENCL / SIZE: De TITLE: QR/Licensing Submittal: Combined General Distribution NOTES: Btandav di.zed plant. N. Davis> NRR: iCg. 05000528 Standav'dized plant. N. Davis> NRR: iCg. 05000529 Standardized plant. I'. Davis. NRR: iCg. 05000530 RECIPIENT COPIEB RECIPIENT COP IES ID CODE/hIANE LTTR ENCL ID CODE/NANE LTTR ENCL PWR-8 ADTS i PNR-8 E8 PWR-8 PEICS8 2 PNR-8 FQ8 PWR-8 PD7 LA PNR-8 PD7 PD 05 LICITRA> E Oi PWR-8 PEICSB PNR-8 RB8 INTERNAL ACRB 29 *DN/LFM8 ELD/HDB3 NRR 8WR ADTS NRR PWR-A ADTS i NRR PWR-8 ADTS DIR NRR/GRAS EG FIL RN/DDANI/I'IIB 04 i i+

0 RGN5 EXTERNAL: LPDR 03 i i+ NRC PDR 02 NBIC 06 PNL GRUEL>R NOTES:

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Appendix A allowables. 2~ Confirmatory response spectra analyses, based on the use of conservative floor response spectra, also result in acceptable stresses and confirm the conclusion of the time history analyses. 3~ Both time history and response spectra analyses conservatively address uncertainties, seismic input, and material properties.

4. Review of available test data shows that the 12-inch fully grouted PVNGS walls have seismic resistance (modulus of rupture) greater than the UBC modulus of rupture value.

5. Use of realistic stiffness/cracking properties for the PVNGS walls demonstrates that the walls will not crack under SSE loads and that high margins of safety are maintained.

6. To account for variabilities, substantial margin exists (approximately 65X) in the stiffness of the's-built walls such that no increase in wall response will occur.

7. In the low seismic area of PVNGS the block walls are not seriously loaded (OBE deflections less than,0.25 inch).

8. SRP 3.8.4 allowables are conservative in nature and result in high margins of safety.

ANPP has proceeded, in good faith, to address and resolve all NRC concerns on this issue and to achieve resolution in accordance with our December 22, 1986 commitment. We request that you review the referenced submittal and all of the confirmatory information documented in the enclosure to this letter, to establish the adequacy of the Elevation 74'-0" masonry block walls at PVNGS. f j r li II >g I r JL 1' I p 1 i Mr. George W. Knighton Masonry Wall Evaluation Confirmatory Data ANPP- 38366 Page 4 We are providing two of the referenced documents to Enclosure 81 to assist your staff in performing their review. Your response is requested by October 10, 1986. Very truly yours, J ~ Haynes ice President Nuclear Production JGH/RAB/dim : "Supplemental Report on the Evaluation of Masonry Walls .for the Arizona Nuclear Power Project, Palo Verde Nuclear Generating Station Units 1, 2 and 3". : "Pactors Influencing Deflections in Grouted Hollow Unit Concrete Masonry Walls" (Reference 88 to Enclosure 1). : "Test Report on Slender Walls" (Reference 89 to'Enclosure 1). l cc: 0. M. DeMichele (all w/enclosure) E. E. Van Brunt, Jr. E. A. Licitra R. P. Zimmerman A. C. Gehr e ~ N 'I V ~n -,( H: j .'~! J '$ V I 'l ll