ML17312A840

Forwards Schedule for Implementation of Remaining Pressure Locking & Thermal Binding Mods Which Completes Util Response to GL 95-07, Pressure Locking & Thermal Binding of SR Power Operated Gate Valves,

ML17312A840
Person / Time
Site:	Palo Verde
Issue date:	06/28/1996
From:	Stewart W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-03725-WLS-A, 102-3725-WLS-A, GL-95-07, GL-95-7, NUDOCS 9607090103
Download: ML17312A840 (10)

Text

DOCKET 05000528 05000529 05000530

SUBJECT:

Responds to request for addi info re GL 95-07, "Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves."-

DISTRIBUTION CODE:

A056D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Generic Ltr 95-07 Pressure Locking 6 Thermal Binding of Safety Rela CATEGORY 1 REGULAT.

INFORMATION DISTRIBUTION SYSTEM (RIDS)

C ACCESSIOQ PPP:9607090103 DOC.DATE: 96/06/28 NOTARIZED: NO FACIL:SQNr5p-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi AUTH.NAME AUTHOR AFFILIATION STEWART,W.L.

Arizona Publ'ic Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

NOTES:STANDARDIZED PLANT Standardized plant.

Standardized plant.

05000528 05000529 05000530 RECIPIENT ID CODE/NAME NRR/DRPE/EATON CLIFFORDgJ INTERNAL:

ILE CENTER 01 EXTERNAL: NOAC NUDOCS ABSTRACT COPIES LTTR ENCL 1

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1 RECIPIENT ID CODE/NAME PD4-2 PD CLIFFORD,J.

NRR/EMEB/B NRC PDR COPIES LTTR ENCL 1

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1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE!

CONTACT THE DOCUMENT CONTROL DESK, ROOM OWFN SD-5(EXT. 415-2083)

TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEEDl TOTAL NUMBER OF COPIES REQUIRED:

LTTR 9

ENCL 9

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WILLIAML. STEWART EXECUTIVEVICE PRESIDENT NUCLEAR Arizona Public Service PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 PHOENIX, ARIZONA 85072-2034 102-03725-WLS/AKK/RJR June 28, 1996 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001

Reference:

Letter 102-03608, dated February 21, 1996, "180-Day Response to NRC Generic Letter No. 95-07," from W. L. Stewart, APS, to USNRC,

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 NRC Generic Letter No. 95-07, 180-Day Response Additional Informatiorl In the above referenced letter, Arizona Public Service Company (APS) committed to providing a schedule for implementation of the remaining pressure locking and thermal binding modifications. This schedule is enclosed and completes APS'esponse to NRC Generic Letter (GL) 95-07, "Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves," dated August 17, 1995.

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

WLS/AKK/RJR/rv Enclosure Sincerely, QC cc:

L. J. Callan K. E. Perkins J. W. Clifford K. E. Johnston

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ENCLOSURE ARIZONAPUBLIC SERVICE COMPANY SCHEDULE FOR IMPLEMENTATIONOF THE REMAININGPRESSURE LOCKING AND THERMALBINDING MODIFICATIONS

The following table identifies the completed and pending modifications for the valves identified as susceptible to pressure locking.

In this table, 1R7 indicates that the modification is scheduled to be completed in the 7th refueling outage for Unit 1.

AIso included is a table showing the current start dates for the identified refueling outages and a table identifying the valves by name.

Implementation Schedule Valve No.

AF-34 AF-35 AF-36 AF-37 SG-134 SG-138 Unit 1 1R7 1R7 1R7 1R7 1R8 1R8 Unit 2 2R7 2R7 2R7 2R7 2R8 2R8 Unit 3 3R6 3R6 3R7 3R7 3R7 3R7 SI-651*

SI-652*

SI-653*

SI-654*

'R6 1R6 1R6 1R7 Com leted Com leted Com leted Com leted Com leted Com leted 2R7 3R6 SI-655 1R8 2R8 3R7 SI-656 SI-672 SI-671 1R7 1R8 1R7

-2R8

'R7 3R7 3R6 2R7 3R6 SI-685 1R8 2R8 3R7 SI-694 SI-686 1R7'R8 2R7

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3R8 2R8 ',

3R7 SI-696 SI-688 1R7 1R8 2R7 2R8 3R8 3R7 SI-693 1R7 2R7 3R8

• These valves are also susceptible to thermal binding.

Procedural controls for these valves were implemented to eliminate susceptibility to thermal binding.

In Reference 1, Sl-604 and Sl-609 were identified as being susceptible to pressure locking.

This susceptibility has been eliminated by limiting the maximum unwedging loads for these valves and no hardware modifications are required.

1R6 9/96 3R6 2/97 CURRENT ESTIMATED OUTAGE START DATES 2R7 1R7 3R7 2R8 9/97 3/98 9/98 3/99 1R8 3R8 9/99 3/00

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AF-34/35 AF-36/37 Valve Name Auxiliary Feedwater Pump Discharge Auxiliary Feedwater Pump Discharge SG-134/138 AuxiliaryFeedwater Pump Turbine Steam Supply SI-604/609 High Pressure Safety Injection Pump Discharge Long Term Loop Recirculation Sl-651/652 Low Pressure Safety Injection Pump Suction (Shutdown Cooling)

Sl-653/654 Low Pressure Safety Injection Pump Suction (Shutdown Cooling)

Sl-655/656 Low Pressure Safety Injection Pump Suction (Shutdown Cooling)

Sl-671/672 Containment Spray Header Isolation S I-685/694 Low Pressure Safety Injection Containment Spray to Shutdown Cooling Heat Exchanger Cross-Tie Sl-686/696 Shutdown Cooling Heat Exchanger Outlet to RCS SI-688/693 Containment Spray Shutdown Cooling Heat Exchanger Bypass

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