ML17311A341

Forwards Supplemental Info in Support of 941009 Proposed Amend to TS 3/4.8.2, DC Sources - Operating, Submitted Under Emergency Circumstances

ML17311A341
Person / Time
Site:	Palo Verde
Issue date:	10/12/1994
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-03147-JML-A, 102-3147-JML-A, NUDOCS 9410190146
Download: ML17311A341 (18)

Text

PR.IC3R.I EY' (ACCELERATED RIDS PROCESSING REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9410190146 DOC.DATE: 94/10/12 NOTARIZED: NO DOCKET g FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 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:

Forwards supplemental info in support of 941009 proposed i

amend to TS 3/4.8.2, "DC Sources Operating," submitted under emergency circumstances.

DISTRIBUTION CODE: AOOID TITLE: OR COPIES RECEIVED:LTR Submittal: General Distribution L ENCL SIZE:

0 NOTES:Standardized plant. 05000529 R RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 LA 1 1 PD4-2 PD 1 1 HOLIAN, B 1 1 TRAN,L 1 1 INTERNAL: ACRS 6 6 LE CENT~0 1 1 NRR/DE/EELB 1 1 NRR/DRCH/HICB 1 1 NRR/DRPW 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 NUDOCS-ABSTRACT 1 1 OGC/HDS2 1 0 EXTERNAL: NOAC 1 1 NRC PDR 1 1 D

0 C

U N

NOTE TO ALL"RIDS" RECIPIENTS:

PLEAsr I~EL> Us To Rr DUcr; ivASTE! cONTAc r I HF DOCI:-CLIENT cONTROL DESK, ROOM PI-37 (EXT. 504.0083 ) TO ELIihIINATEYOUR NAiIE FRO>I DISTRIBUTION LISTS I:OR DOCl'b,IEi'I'S YOI.'ON"I'LEI)I TOTAL NUMBER OF COPIES REQUIRED: LTTR 20 ENCL 19

~ I V

'd IJ

Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX, ARIZONA85072-2034 102-03147-JML/AKK/RJR JAMES M. LEVINE VICE PRESIOENT October 12, 1994 NUCLEAR PROOUCTION U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station P1-37 Washington, D.C. 20555

Reference:

Letter No. 102-03144, dated October 9, 1994, "Proposed Technical Specification Amendment to Specification 3/4.8.2, D.C. Sources, Under Emergency Circumstances"

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 Supplemental Information in Support of Proposed Technical Specification Amendment to Specification 3/4.8.2, D.C. Sources, Under Emergency Circumstances File: 94-056-026'4-005%19.05 Based upon a meeting held with NRC Staff on October 12, 1994, Arizona Public Service Company (APS) is providing the enclosed supplemental information in support of the proposed amendment to Technical Specification 3/4.8.2, D.C. Sources - Operating.

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

Sincerely, JML/AKK/RJR/rv Enclosure cc: L. J. Callan (all w/enclosure)

K. E. Perkins B. E. Holian K. E. Johnston A. V. Godwin (ARRA)

I B.'0 89 1 94101'7I014b 941012 ADQCK 0500052'P PDR P? .......PDR

f c- f l

Lg Ee

ENCLOSURE SUPPLEMENTAL INFORMATION IN SUPPORT OF PROPOSED AMENDMENTTO TECHNICAL SPECIFICATION

. SECTION 3/4.8.2, D.C. SOURCES UNDER EMERGENCY CIRCUMSTANCES

~ V ENCLOSURE On October 12, 1994, a meeting was held with the NRC to discuss APS'ro'posed amendment to Technical Specification 3/4.8.2, D.C. Sources. In the meeting, and in telephone calls subsequent to the meeting, APS presented additional/revised compensatory measures to be implemented between now and the fifth refueling outage for Unit 2 in view of the degradation observed in the four battery banks. These additional/revised compensatory measures are described below..

h APS is replacing a combined total of 23 cells in the bank A and C batteries. The replaced cells will be used to form four control groups of 4 cells each. Testing of these four'roups will be performed at approximately 30 day intervals as follows:

Time From Present and T e of Test Control Grou ¹ October November December Jenuerlr 1 S N/A N/A . N/A

.2 N/A, S N/A N/A 3 N/A N/A S N/A 4 N/A N/A N/A S Legend: S = Battery Service Test (performed to the bank A battery load profile)

This testing is being performed to provide assurance that the degradation mechanism is primarily related to discharge/recharge cycling of the batteries and to demonstrate that the batteries in the unit are capable of meeting the design duty cycle. After each test, an evaluation of the performance of each group will be'performed using the following acceptance criteria:

1. The control group results meet the bank A battery design duty cycle; and

.2. No individual cell reversal occurs (<1.0 volts).

The results of the tests will be used to verify the degradation model and will be provided to the NRC.

If the above criteria 'are not met, the unit will enter the action statement for Specification 3.8.2.1 and will take appropriate actions.

1 E 0

PVNGS will also initiate the following additional compensatory actions for Unit 2:

1. Maintenance limitations for important equipment:

PVNGS will use PRA to review all 125 VDC system and related auxiliaries corrective/preventative maintenance work. The need to perform long-term maintenance and achieve long-term availability of important-to-safety equipment will be balanced.

Controls for electrical supply integrity PVNGS will issue a night order to the Unit 1 Control Room stating that Unit 2 offsite power supplies and associated 13.8 kV buses should not be interrupted.

Access to the switchyard will be limited. All emergent switchyard work will be reviewed by the Unit 1 Shift Supervisor.

Manual operation of the Auxiliary Feedwater. Pump Turbine and Atmospheric Dump Valves will be reviewed with the Unit 2 operators.

Increase the following battery testing to every other week for all cells.

Testing will be staggered between trains.

Actions to be Parameter Limits/Allowable Taken if Outside Limits Float Voltage >2.18 Volts Battery Inoperable'attery Float Current <500 ma Inoperable Specific Gravity >1.280 Restore within limits within 7 days Avg of all connected Restore within limits within 7 days cells >1.290 Not more than 0.020 Battery Inoperable below average of all connected cells Avg of all connected Battery Inoperable cells, >1.280

1 h

j f

I l

Mar in Calculation As discussed in the October 12, 1994, meeting the electrical load calculation for bank B battery will be completed by October 14, 1994. This action will ensure the bank A load profile is the worst-case profile.

Root Cause Anal sis Disassembly and inspection of the remaining 2 cells at the CBD Facility will be' performed. Any significant findings from the root cause analysis, surveillance testing or any other source that invalidate APS'onclusion(s) will be promptly communicated with the NRC. Final results of the root cause analysis will be provided to the NRC.

Additional Data As requested in the meeting and subsequent conversations, attached is the battery bank 2A design duty cycle load profile, the results of capacity discharge tests for 5 cells from battery bank 2A, and a list of the Unit 2 battery bank required capacities.

t I' Batter A Load Profile Step Corrected Cumulative DU ration Load Load Amp-Hr 515 561.35 9.36 9.36 24 184 200.56 80.22 89.58 1 298 324.82 5.41 94.99 14 I84 20Q.56 46.80 141.79 1 298 324.S2 5.4 I 147.20 14 184 200.56 46.8Q 194.00 1 298 324.82 5.41 199.42 17 184 200.56 56.83 256.24 1 298 324.82 5.41 261.65 12 184 200.56 40.11 301.77 298 324.82 5.41 307.18 18 184 20Q.56 60.17 367.35 1 298 324.82 5.41 372.76 11 184 20Q.56 36.77 409.53 1 298 324.82 5.41 414.94 1 184 200.56 3.34 418.29 1 240 261.60 4.36 422.65 SOURCE: Document 0 2-EC-AK-207

t.

CAPACITY TEST FOR CE<LLS REMOVED FROM BATTERY 2A Battery 2A Cells Cell Number Projected 10/10/94 Actual 6 From Projected 5 62.3% 50.0% -12.3%

33 40.2/0 56.7% +16.5%

34 57.1/0 61.7% +4.6%

35 46.7% 51.7% +5.0%

51 58.1% 57 3/0 -08 AVE<RAGE 52.9% 55.5% +2.6%

~

~

AMOUNT OF MANUFACTURER'S RATING REQUIRED TO MKKTTHK SAFETY-RELATED FUNCTIONS OF THK UNIT 2 BATTERY BANKS

% OF MANUFACTURER'S RATING 55.2 49 4%

2C 33.6 30.1

• Preliminary value. Final value to be issued on 10/14/94, however "A" bank is the worst case profile.

il

~ . I 1

Ip l