ML17311A490

Application for Amends to Licenses NPF-41,NPF-51 & NPF-74, Requesting TS 3/4.7.5 to Change Bases for Ultimate Heat Sink from Providing 27 Day Cooling Water Supply to Providing 26 Day Cooling Water Supply

ML17311A490
Person / Time
Site:	Palo Verde
Issue date:	12/07/1994
From:	Stewart W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17311A492	List: ML17311A490
References
102-03202-WLS-R, 102-3202-WLS-R, NUDOCS 9412210198
Download: ML17311A490 (8)

Text

PRIDRIWY (ACCEI ERATED RIDS PROCI'.SSIi REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9412210198 DOC.DATE: 94/12/07 NOTARIZED: YES DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH. NAME AUTHOR AFFILIATION P STEWART,W.L. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Application for amends to Licenses NPF-41,NPF-51 6 NPF-74, requesting TS 3/4.7.5 to change bases for ultimate heat sink from providing 27 day cooling water supply to providing 26 day cooling water supply. 0 DISTRIBUTION CODE: AOOID COPIES RECEIVED:LTR ENCL SIZE: 5f F TITLE: OR Submittal: General Distribution NOTES:STANDARDIZED PLANT 05000528 I Standardized plant. 05000529 Standardized plant. 05000530 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 LA 1 1 PD4-2 PD 1 1 HOLIAN, B 1 1 TRAN,L 1 1 INTERNAL: ACRS 6 6 FILE C NTER 01 1 1 NRR/DRCH/HICB 1 1 NRR/DS SA+S CS B 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 NUDOCS-ABSTRACT 1 1 OGC/HDS2 1 0 D EXTERNAL: NOAC 1 1 NRC PDR 1 1 0

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NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE O'ASTE! CONTACT'I HE DOC!:i!ENTCONTROL DESK, ROOKI Pl-37 <EXT. 504- 083 ) TO ELI%1INATE YOUR NAi!LFROil DISTRIBUTION LIS'I'S I:OR DOCI:MEN'I'S YOU DON"I'LI'.!)!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 19 ENCL 18

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Arizona Public Service Company P.O. BOX 53999 ~ PHOENIX. ARIZONA 85072-3999 WILLIAML. STEWART 102-03202-WLS/RAB/RKR EXECUTIVEVICEPAESIDENT NUCLEAII 7, 1994 'ecember U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 Proposed Amendment to Bases for Technical Specification Section 3/4.7.5 File: 94-056-026 Arizona Public Service Company (APS) is requesting an amendment to the bases for Technical Specification 3/4.7.5. The proposed amendment will change the bases for the ultimate heat sink (spray ponds) from providing a 27 day cooling water supply to providing a 26 day cooling water supply. A review of the plant design bases revealed that the as-built essential spray pond system has a higher flow rate than originally assumed in the water supply calculation, resulting in a slightly greater projected water loss. This resulted in a change to the capacity of the UHS without makeup, as described in the bases for Technical Specification 3/4.7.5, from 27 days to 26 days. Even with this change, the continuous capability of the heat sink to perform its safety function is still maintained, in accordance with the guidance of Regulatory Guide 1.27, Revision 2, "Ultimate Heat Sink for Nuclear Plants," January 1976. APS has determined that the change to the capacity of the UHS involves a reduction in the margin of safety as QADI defined in the bases for Technical Specification 3/4.7.5 and requires NRC review.

As an interim action, the spray pond level is being verified each shift, by manually measuring the water level, to ensure that the UHS has a 27 day capacity. The required level for a 27 day supply cannot be maintained using the level indication in the Control Room due to instrument inaccuracy (i.e., the level would be at the top of the spray pond if level indication were relied on). The change to 26 days maintains the existing level requirement in Technical Specification 3/4.7.5.

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U. S., Nuclear Regulatory Commission

'TTN: Document Control Desk Proposed Amendment to Technical Specification Page 2 Provided in the enclosure to this letter are the following sections which support the proposed Technical Specification amendment:

A. Description of the Technical Specification Amendment Request B. Purpose of the Technical Specifications C. Need for the Technical Specification Amendment D. No Significant Hazards Consideration Determination E. Safety Analysis for the Technical Specification Amendment Request F. Environmental Consideration G. Marked-up Technical Specification Pages In accordance with Technical Specification 6.5, the Plant Review Board and the Offsite Safety Review Committee have reviewed and concurred with this request. Pursuant to 10 CFR 50.91(b)(1), a copy of this request has been forwarded to the Arizona Radiation Regulatory Agency.

Should you have any questions, please contact Scott A. Bauer of my staff at (602) 393-5978.

Sincerely, WLS/RAB/RKR/rv Enclosure cc: L. J. Callan K. E. Perkins B. E. Holian K. E. Johnston A. V. Godwin ARRA

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STATE OF ARIZONA )

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COUNTY OF MARICOPA )

I, W. L. Stewart, represent that I am Executive Vice President - Nuclear, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority to do so, that I have read such document and know its contents, and that to the best of my knowledge and belief, the statements made therein are true and correct.

W. L. Stewart Sworn To Before Me This / Day Of , 1994.

Notary Public My Commission Expires My CoarnI3sioIIEvg'.re" Jon392, 199T

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