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)

Text

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SUBJECT:

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

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" in response to NRC concerns re abilitp op nails to withstand OBE

~c SSE. Conf iv matorg analyses suppov t time history v esults demonstv ating adequacy of walls.

DISTRIBUTION CODE:

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ACCEBSIQN N8R: 8609240092 DOC. DATE: 86/09/i9 NOTARIZED:

NO FACIL:BTN-50-528 Palo Vev'de Nuclear Station>

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Av'izona Publi CSTN-50-52'P Palo Verde Nucleav Station>

Unit 2> Arizona. Publi STN-50-530 Palo Vev de Nuclear Station>

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Av izona Publi AUTH. NAl']E AUTHOR AFFILIATION HAYNES, J. G.

Arizona Nucleav Powev Pv o Ject

( formerly *vi zona Public Sev v RECIP. NANE RECIPIENT AFFILIATION KNIGHTQN> G. N.

PNR Pv object Div ectov ate 7

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05000528 05000529 05000530 RECIPIENT ID CODE/hIANE PWR-8 ADTS PWR-8 PEICS8 PWR-8 PD7 LA LICITRA>E Oi PNR-8 RB8 INTERNAL ACRB 29 ELD/HDB3 NRR PWR-A ADTS DIR EG FIL 04 RN/DDANI/I'IIB COPIEB LTTR ENCL i

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RECIPIENT ID CODE/NANE PNR-8 E8 PNR-8 FQ8 PNR-8 PD7 PD 05 PWR-8 PEICSB

• DN/LFM8 NRR 8WR ADTS NRR PWR-8 ADTS NRR/GRAS RGN5 COP IES LTTR ENCL EXTERNAL: LPDR NBIC NOTES:

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Appendix A allowables. 2 ~ 3 ~ 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.

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 >g I II 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 cc:

0. M. DeMichele E.

E. Van Brunt, Jr. E. A. Licitra R. P. Zimmerman A. C. Gehr : "Supplemental Report on the Evaluation of Masonry Walls.for the Arizona Nuclear Power

Project, Palo Verde Nuclear Generating Station Units 1, 2 and 3".

Enclosure 2: "Pactors Influencing Deflections in Grouted Hollow Unit Concrete Masonry Walls" (Reference 88 to Enclosure 1). Enclosure 3: "Test Report on Slender Walls" (Reference 89 to'Enclosure 1). l (all w/enclosure) e ~ N 'I V ~n -,( H: j .'~! J V I 'l ll