ML17312A986
| ML17312A986 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/28/1996 |
| From: | James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-008, IEB-88-8, NUDOCS 9610080342 | |
| Download: ML17312A986 (6) | |
Text
CAL~UrUKX REGUL RY INFORMATION DISTRIBUTIO 'YSTEM (RIDS)
ACCESSION NBR:9610080342 DOC.DATE: 96/09/28 NOTARIZED: NO DOCKET FACIL:STH-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 LEVINE,J.M.
Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Provides response re installation of thermocouples in plant Units 1
& 2,per 940218 request.
DISTRIBUTION CODE:
ZE16D COPIES RECEIVED:LTR I ENCL 0 SIZE:
2 TITLE: Bulletin Response 88-08 Thermal Stress in Piping to RCS.
NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
05000528 05000529 G
05000530 0
RECIPIENT ID CODE/NAME PD4-2 PD INTERNAL: AEOD/DOA NRR/DE/EMCB NRR/DRPM/PECB RGN4 FILE 01 EXTERNAL: NOAC COPIES LTTR ENCL RECIPIENT ID CODE/NAME CLIFFORD,J I
CE EMEB RES/DSIR/EIB NRC PDR COPIES LTTR ENCL D
U E
N NOTE TO ALL "RIDS" RECIPZENTSI PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPZES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)
ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 11 ENCI
0 O.
Arizona Public Service Company PALO VEROE NUCLEAR GENERATING STATION P.O. BOX 52034
~
PHOENIX. ARIZONA85072-2034 102-03788-JML/SAB/R JR September 28, 1996 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001 References1:
Letter dated February 18, 1994, from T. Polich, USNRC, to W.
F.
Conway, APS, "Palo Verde Nuclear Generating Station, Unit Nos.
1, 2, and 3 - Response to NRC Bulletin 88-08" (TAC Nos. M69664, M69665, and M69666) 2: Letter 102-02555, dated June 30, 1993, from to W. F. Conway, APS, to Document Control Desk, USNRC "Response to Request for Information Regarding NRC Bulletin.88-08"
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 NRC Bulletin 88-08, Thermal Stresses in Piping Connected to Reactor Coolant Systems This letter contains Arizona Public Service Company's (APS) response regarding the installation of thermocouples in PVNGS Units 1 and 2 as requested in Reference 1.
As indicated in Reference 2, APS installed thermocouples on the pressurizer auxiliary spray and main spray systems in PVNGS Unit 3 to detect pressurizer auxiliary spray line thermal stratification caused by valve in-leakage.
In addition, APS has continued to work with the Combustion Engineering Owners Group's (GEOG) efforts on thermal stratification and has provided the group with the technical data from PVNGS.
The APS Nuclear Engineering Department has reviewed the current GEOG's efforts along with PVNGS surveillance results.
The data collected during the PVNGS Unit 3 sixth refueling outage and during previous collection efforts demonstrate that the pressurizer auxiliary spray line thermal stratification exists due to valve in-leakage.
However, the temperature profiles are constant and do not demonstrate any cyclic 9610080342 960928 PDR ADOCK 05000528 Q
II ki t
U. S. Nuclear Regulatory Commission ATTN: Document Control Desk NRC'Bulletin 88-08 Page 2 nature that may lead to high cycle thermal fatigue.
Once the temperature profile has been established, this profile is maintained during the cycle.
Additionally, interaction at the piping tee between the leakage flow and main spray flow is not expected to cause any cycling at the tee due to the relatively low main spray flow.
Based on this review, it has been determined that similar installations of thermocouples in Units 1 and 2 are not warranted.
The GEOG's Thermal Stratification Working Group is expected to complete its task this Fall. APS will review the results.
Ifany information is developed which would affect the decision not to install thermocouples in Units 1 and 2, APS will inform the NRC.
Should you have any questions or require additional information, please contact Scott A. Bauer at (602) 393-5978.
Sincerely, JML/SAB/RJR/dpr James.M. Levine Sr. Vice President, Nuclear cc:
K. E. Perkins L. J. Callan J. W. Clifford K. E. Johnston
0 41 7,