ML17311A490
| 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: |
| 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 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.
DISTRIBUTION CODE:
AOOID COPIES RECEIVED:LTR ENCL SIZE: 5 f F TITLE:
OR Submittal:
General Distribution P
0 NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
05000528 I
05000529 05000530 RECIPIENT ID CODE/NAME PD4-2 LA HOLIAN, B INTERNAL: ACRS NRR/DRCH/HICB NRR/DSSA/SPLB NUDOCS-ABSTRACT EXTERNAL: NOAC COPIES LTTR ENCL 1
1 1
1 6
6 1
1 1
1 1
1 1
1 RECIPIENT ID CODE/NAME PD4-2 PD TRAN,L FILE C NTER 01 NRR/DS SA+S CS B NRR/DSSA/SRXB OGC/HDS2 NRC PDR COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
0 1
1 D
0 C
U NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE O'ASTE! CONTACT'IHE DOC!:i!ENTCONTROL DESK, ROOKI Pl-37 <EXT. 504- 083 ) TO ELI%1INATEYOUR NAi!LFROil DISTRIBUTIONLIS'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
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PHOENIX. ARIZONA85072-3999 WILLIAML. STEWART EXECUTIVEVICEPAESIDENT NUCLEAII 102-03202-WLS/RAB/RKR
'ecember 7, 1994 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555
Dear Sirs:
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 willchange 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 ofthe 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
- 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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'74122101II'8 941207 PDR ADOCK 05000528 PDR P
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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 MyCoarnI3sioIIEvg'.re" Jon392, 199T
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