ML17310B005
| ML17310B005 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 01/25/1994 |
| From: | Conway W, James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17310B007 | List: |
| References | |
| 102-02797-WFC-R, 102-2797-WFC-R, NUDOCS 9402020234 | |
| Download: ML17310B005 (8) | |
Text
ACCELERATED DI TRIBUTION DEMONS TION SYSTEM REGULATORY INFORMATXON DXSTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9402020234 DOC.DATE: 94/01/25 NOTARIZED: YES DOCKET FACIL:STN-50-530 Palo Verde Nuclear Station, Unit. 3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFXLIATION LEVINE,J.M.
Arizona Public Service Co.
(formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch. (Document Control Desk)
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SUBJECT:
Forwards "Unit 3 Mid-Cycle SG Xnspection."
DXSTRIBUTION CODE:
A001D COPIES RECEIVED:LTR ENCL TITLE: OR Submittal:
General Distribution NOTES:Standardized plant.
I sxzE: 3 +~ ~'D 05000530
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RECIPIENT ID CODE/NAME PDV LA TRAN,L INTERNAL: ACRS NRR/DORS/OTSB NRR/DRPW NRR/DSSA/SRXB OC/+FD~
01 EXTERNAL: NRC PDR COPIES LTTR ENCL 1
1 2
2 6
6 1
1 1
1 1
1 1
0 1
1 1
1 RECIPIENT ID CODE/NAME PDV PD NRR/DE/EELB NRR/DRCH/HICB NRR/DSSA/SPLB NUDOCS-ABSTRACT OGC/HDS1 NSIC COPIES LTTR,ENCL 1
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NOTE TO ALL"RIDS" RECIPIENTS:
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PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 22 ENCL 20
Arizona Public Service Company P.O. BOX 53999
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PHOENIX. ARIZONA85072-3999 WILLIAMF. CONWAY EXECUTIVEVICEPRESIOENT NUCLEAR 102-02797-WFC/RAB/JRP January 25, 1994 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, D.C. 20555 REF:
1.
Letter 4102-02730, dated November 17, 1993 from J. M. Levine, Vice President, Nuclear Production, APS, to USNRC 2.
Letter P1 02-0271 6, dated November 2, 1993, from W. F. Conway, Executive Vice President, Nuclear Production, APS, to USNRC
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Unit 3 Docket No. STN 50-530 Steam Generator Inspection File: 94-056-026 This letter is transmitting the results of the Unit 3 mid-cycle steam generator inspection.
The Steam Generator Inspection Plan was submitted to the Nuclear Regulatory Commission (NRC) by Reference 1.
The Unit 3 steam generators were inspected during the recent mid-cycle outage (U3M4) using Eddy Current Testing (ECT) technology comprised of both bobbin coil probe and motorized rotating pancake coil (MRPC) probe.
The inspection found no evidence of
.axial cracks in the upper hot leg area as was identified by analysis and inspection during the Unit 2 refueling outage (U2R4). This inspection did identify volumetric indications in both steam generators and circumferential cracking at the top of the tubesheet (hot) expansion transition region in steam generator 32.
There were three single circumferential indications (SCI) and one multiple circumferential indication (MCI). This cracking was characterized as inside diameter initiated.
All tubes with circumferential cracks were removed from service by plugging.
The safety significance of the circumferential cracking in Unit 3 is bounded by Regulatory Guide 1.121 analysis, which was performed for Unit 1 during the fall 1993 refueling outage and transmitted to the NRC by Reference 2.
( 9402020234 940125 IDO~K 0500 POR
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Document Control Desk U. S. Nuclear Regulatory Commission Page 2 The probability of occurrence or the consequences of an accident previously evaluated is not increased
.as a result of the circumferential cracking in Unit 3.
The four circumferential cracks found in Unit 3 are bounded by in situ pressure tests and analysis conducted for Unit 1, which verified that the margin of safety specified in Regulatory Guide 1.121 was maintained.
The observed crack sizes indicate that Regulatory Guide limits were not exceeded during the past cycle of operation.
Therefore, it can be
'oncluded that operation of Unit 3 until the end of its cycle would not constitute a safety concern.
Enclosed with this letter are copies of the Unit 3 Steam Generator Inspection Report.
Should you have any questions, please contact Richard A. Bernier at (602) 393-5882.
Sincerely, WFC/RAB/JRP/did Enclosure cc:
K. E. Perkins B. E. Holian K. E. Johnston
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STATE OF ARIZONA
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COUNTY OF MARICOPA )
I, J. M. Levine, represent that I am Vice President Nuclear Production, 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,'nd that to the best of my knowledge and belief, the statements made therein are true and correct.
J. M. Levine Sworn To Before Me This ~
Day Qf
, 1994.
I P2 i-C t4 Notary Public';:
My Commission Expires
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