ML17306B028

Submits Info Re Modification of Current Periodic Testing Performed on App R dual-life Fixtures,To Supplement 900801 Response to Insp Repts 50-528/90-25,50-529/90-25 & 50-530/90-25 Re Safe Shutdown Emergency Lighting

ML17306B028
Person / Time
Site:	Palo Verde
Issue date:	09/19/1992
From:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
102-02281-WFC-T, 102-2281-WFC-T, NUDOCS 9210090338
Download: ML17306B028 (6)

Text

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ACCESSION NBR:9210090338 DOC.DATE: 92/09/19 NOTARIZED:

NO CIL:STN-50-528 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 CONWAYsW ~ F ~

Arizona Public Service Co. (formeily Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION MARTIN,J.B.

Region 5 (Post 820201)

SUBJECT:

Submits info re modification of current periodic testing performed on App R dual-life fixtures,to.supplement 900801 response to Insp Repts 50-528/90-25,50-529/90-25

&'0-530/90-25 re safe shutdown emergency lighting.

DISTRIBUTION CODE:

IEDID COPIES RECEIVED:LTR J ENCL 0 SIZE:

TITLE: General (50 Dkt)-lnsp.Rept/Notice of Violation Response NOTES:STANDARDIZED PLANT Standardized plant.

Standardized plant.

/'5000528 0500052$

05000530 D

RECIPIENT ID CODE/NAME PDS PD NAL: ACRS AEOD/DEIB AEOD/TTC NRR MORISSEAU,D NRR/DLPQ/LPEB10 NRR/DREP/PEPB9H NUDOCS-ABSTRACT OGC/HDSl RGN5 FILE 01 EXTERNAL: EG&G/BRYCEsJ.H.

NSIC COPIES LTTR ENCL RECIPIENT ID CODE/NAME TRAMMELL,C AEOD p

AEOD/DSP/TPAB DEDRO NRR/DLPQ/LHFBPT NRR/DOEA/OEAB NRR/PMAS/ILRB12 OE DIR FIL 02 NRC PDR COPIES LTTR ENCL 1

1 1

1 1

1 1

1 YOTE TO ALL "RIDS RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! COYTACT THE DOCUMEYT COYTROL DESK.

ROOM Pl-57 (EXT. 50>>'-2065) TO ELIMINATEYOUR NAME FROM D!STRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

'OTAL NUMBER OF COPIES REQUIRED:

LTTR 24 ENCL

Arizona Public Service Company P.O. BOX 53999

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PHOENIX. ARIZONA95072-3999 RECE i'i'ELi NRC REGIOH V WILLIAMF. CONWAY EXECUTIVE'ICEPRESIDENT NUCLEAR Mr. John B. Martin Regional Administrator, Region V U. S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368

~EP 24 A10:26 102-02281-WFC/TRB/OLK September 19; 1992

Reference:

Letter 161-03373, dated August 1, 1990, from W. F. Conway, APS, to J. B. Martin, NRC, "Response to NRC Inspection Report Nos. 50-528, 529 and 530/90 Safe Shutdown Emergency Lighting"

Subject:

Palo Verde Nuclear Generating Station {PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528/529/530

.Appendix R Dual-Lite Capacity Discharge Testing File: 92-056-026 The purpose of this letter is to inform the NRC of Arizona Public Service Company's (APS) intention to modify the current periodic testing performed on Appendix R Dual-Lite fixtures.

In the referenced letter, APS committed to write and implement capacity discharge tests in order to obtain data for predicting potential failures and for improving the reliability of emergency lighting.

The capacity discharge test, currently being used as a result of the above commitment, requires the fixtures to be discharged until battery terminal voltage reaches 87.5 percent of nominal voltage. This test renders the fixtures unavailable for extended periods of time (94 hours0.00109 days <br />0.0261 hours <br />1.554233e-4 weeks <br />3.5767e-5 months <br />, in some cases, which includes discharging and recovering the battery).

Furthermore, data gathered from prolonged discharging has provided little information that is useful in predicting potential failures.

For these reasons, APS is removing the existing 87.5 percent battery terminal voltage requirement from the test procedure and implementing requirements to discharge the batteries for a minimum of 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. To account for worst case environmental conditions, the discharge acceptance criteria for PVNGS 8-hour Appendix R Dual-Lites has been established at 8.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, Based on the 8.8-hour acceptance criteria, a 10-hour discharge will ensure the batteries have at least a 12.5 percent margin.

Batteries not able to demonstrate a 12.5 percent margin will be replaced.

These changes will not affect APS'bility to obtain data for predicting potential failures and will increase emergency lighting availability.

(:BOI 'i 9210090338 920919 PDR ADDCK 05000528 8

PDR

Mr. John B. Martin Regional Administrator, Region V U. S. Nuclear Regulatory Commission Appendix R Dual-Lite Capacity Discharge Testing Page 2 If you should have any questions, please contact Thomas R. Bradish at (602) 393-5421.

Sincerely, 0

WFC/TRB/DLK/pmm cc:

J. A. Sloan Document Control Desk

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