ML17311B021

Advises NRC That Plant Has Completed Actions Re safety- Related MOV Testing & Surveillance for Unit 1 Per GL 89-10. Actions That Remain to Be Addressed Listed

ML17311B021
Person / Time
Site:	Palo Verde
Issue date:	07/02/1995
From:	Stewart W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-03410-WLS-S, 102-3410-WLS-S, GL-89-10, NUDOCS 9507140102
Download: ML17311B021 (6)

Text

PRIORITY 1 t (ACCELERATED RZDS PROCESSING)

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9507140102 DOC.DATE: 95/07/02 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 P

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)

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SUBJECT:

Advises NRC that plant has completed actions re safety-related MOV testing

& surveillance for Unit 1 per GL 89-10.

Actions that remain to be addressed listed.

0 DISTRIBUTION CODE:

A064D COPIES RECEIVED:LTR J ENCL

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SIZE: c2.

TITLE: Response to Generic Ltr 89-10, "Safety-Related MOV Testing

!!'4 Surveill NOTES:STANDARDIZED PLANT 05000528 I INTERNAL:

RECIPIENT ID CODE/NAME PD4-2 PD TRAN,L FILE C TER 01

/DlSP/PIPB NRR/PD111-3 RES/DSIR/EIB/B COPIES LTTR ENCL RECIPIENT ID CODE/NAME HOLIAN, B AEOD/SPD/RAB NRR/DE/EMEB NRR/DOPS/OECB RES/DSIR COPIES LTTR ENCL D

EXTERNAL: NOAC NRC PDR M'

NOTE TO ALL "RZDS" RECZPZENTS:

PLEASE HELP US TO REDUCE WASTE!

CONTACT THE DOCUMENT CONTROL

DESK, ROOM OWFN SDS (4!15-2083)

TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED:

LTTR 14 ENCL

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WILLIAML. STEWART EXECUTIVEVICEPRESIDENT NUCLEAR Arizona Public Service Company P.O. 8OX 53999

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PHOfNIX.ARIZONA85072-3999 102-03410-WLS/SAB/R JR July 2, 1995 U. S. Nuclear Regulatory Commission ATIN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit I Docket No. STN 50-528 Completion of Generic Letter No. 89-10, Safety-Related Motor Operated Valve Testing and Surveillance Generic Letter (GL) 89-10 requires licensees to advise the NRC in writing when the actions delineated in the first paragraph of item (i) of the GL have been completed.

Arizona Public Service Company (APS) has completed these actions for Unit 1 at PVNGS. The motor-operated valves (MOVs) within the scope of the program for Unit 1 have been evaluated and tested and are considered operable under all design basis conditions and normal events.

Although development and implementation of the MOV program have been completed, actions remain to be taken to address additional MOVissues.

These actions include:

1)

Pressure Locking/Thermal Binding The evaluation of the potential for pressure locking and thermal binding of safety-related gate valves is ongoing.

A proposed GL on this issue was published for comment in the Federal Register on March 27, 1995.

A review of this proposed GL is in progress.

2)

Periodic Verification Although periodic verification requirements have been incorporated in the MOV

program, an evaluation of the need to perform periodic dynamic testing is ongoing.

This evaluation will include.a review of the MOV test program completed by the Electric Power Research Institute (EPRI) and the test data from the three PVNGS Units.

'TI507140102 950702 PDR ADOCK 05000528 P

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4 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Completion of Generic Letter No. 89-10 Page 2 3)

Valve Mispositioning The PVNGS MOV program currently incorporates elements of valve mispositioning.

It is understood that Supplement 7 of GL 89-10 will address valve mispositioning and will be issued in the near future.

4.

Thermal Expansion The thermal expansion of water between two closed valves is still being evaluated.

Although this issue is considered in the design bases of the plant, operation of these valves following a design basis event is not.

PVNGS procedures use these valves post accident (normal MOV operations),

and the resolution of this issue requires further analysis.

The NRC conducted inspections of the MOV program on July 8-26,

1991, (50-528/529/530/91-25),

October 18-22, 1993, (50-528/529/530/93-32),

and April 4-8, and 20, 1994, (50-528/529/530/94-11).

In the April 1994 inspection, the NRC inspectors concluded that the APS MOV program was generally capable of demonstrating the operability of MOVs subject to GL 89-10 and that the program was thorough and was being implemented in a manner consistent with the APS commitments to the GL.

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

Sincerely, WLS/SAB/R JR/rv cc:

K. E. Perkins L. J. Callan B. E. Holian K. E. Johnston

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