NL-09-128, Response to Request for Additional Information Regarding Amendment Application for Battery Capacity Surveillance Requirement

Response to Request for Additional Information Regarding Amendment Application for Battery Capacity Surveillance Requirement

ML093010361
Person / Time
Site:	Indian Point
Issue date:	09/21/2009
From:	Joseph E Pollock Entergy Nuclear Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-09-128, TAC ME0985
Download: ML093010361 (10)

Text

Indian Point Energy Center 450 Broadway, GSB P.O. Box 249 SwEnterg y Buchanan, N.Y. 10511-0249 Tel (914) 734-6700 J.E. Pollock Site Vice President Administration September 21, 2009 NL-09-128 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Response To Request for Additional Information Regarding Amendment Application for Battery Capacity Surveillance Requirement (TAC. NO. ME0985)

Indian Point Unit No. 2 Docket No. 50-247 License No. DPR-26

REFERENCE:

1. NRC letter to Entergy on Indian Point Nuclear Generating Unit No. 2 -

Request for Additional Information Regarding Amendment Application for the Technical Specification on Battery Capacity (TAC. NO. ME0985), dated July 23, 2009

2. Entergy Letter to NRC, NL-09-001, Proposed Change to Indian Point 2 Technical Specifications Regarding Battery Capacity Surveillance Requirement, dated March 29, 2009

Dear Sir or Madam:

Entergy Nuclear Operations, Inc (Entergy) is hereby providing a response to the NRC request for additional information, Reference 1, associated with the proposed changes to Indian Point 2 Technical Specification for battery capacity requirements submitted in Reference 2. The response to the question is provided in Attachment 1.

There are no new commitments identified in this submittal. If you have any questions or require additional information, please contact Mr. R. Walpole, Manager, Licensing at (914) 734-6710.

NL-09-128 Docket No. 50-247 Page 2 of 2 I declare under penalty of perjury that the foregoing is true and correct. Executed on September l____, 2009.

Sincerely, JEP/sp

Attachment:

1. Reply to NRC Request for Additional Information Regarding Proposed Changes Battery Capacity Requirement

Enclosures:

1. FEX-00062-01, "Minimum Operating Electrolyte Temperature for 125 V DC Batteries 21, 22, 23, and 24"

2. FEX-00204-00, "Station Battery 22 System Calculation" cc: Mr. John P. Boska, Senior Project Manager, NRC NRR Mr. Samuel J. Collins, Regional Administrator, NRC Region I NRC Senior Resident Inspectors Office Mr. Francis J. Murray, Jr., President and CEO, NYSERDA Mr. Paul Eddy, New York State Dept. of Public Service

ATTACHMENT 1 TO NL-09-128 REPLY TO NRC REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED CHANGES BATTERY CAPACITY REQUIREMENT ENTERGY NUCLEAR OPERATIONS, INC INDIAN POINT NUCLEAR GENERATING UNIT NO. 2 DOCKET No. 50-247

Attachment 1 NL-09-128 Docket No. 50-247 Page 1 of 1 Response To Request For Additional Information By letter dated March 29, 2009, Accession No. ML090980300, Entergy Nuclear Operations, Inc, (Entergy) requested an amendment to revise the battery capacity acceptance criterion specified in TS Surveillance Requirement (SR) 3.8.6.6. Specifically, the proposed change would modify SR 3.8.6.6 by establishing a more restrictive acceptance criterion regarding periodic verification of battery capacity to ensure the IP2 batteries can perform their intended design functions. The Nuclear Regulatory Commission staff is reviewing the submittal and the following replies to a request for additional information:

Question 1 In the license amendment request, the licensee proposed revising the battery capacity acceptance criterion specified in Technical Specification Surveillance Requirement 3.8.6.6. Please provide the full calculation for the proposed capacity rating, including assumptions and supporting documentation, to show that the 125 Volt direct current batteries will perform their intended design functions.

Response

The change to 85 % battery capacity was originally determined by calculation FEX-00062-01 (Enclosure 1), and provided margin beyond test procedure acceptance criteria of 90 %. The calculation also established a minimum electrolyte temperature of 59 degrees F.

Current DC system calculations use the same 85 % capacity for battery sizing. One of these calculations, FEX-00204, is provided (Enclosure 2) as a sample. This is typical of the calculations performed to ensure intended design functions can be met.

ENCLOSURE 1 TO NL-09-128 FEX-00062-01 "MINIMUM OPERATING ELECTROLYTE TEMPERATURE FOR 125 V DC BATTERIES 21, 22, 23, AND 24" ENTERGY NUCLEAR OPERATIONS, INC INDIAN'POINT NUCLEAR GENERATING UNIT NO. 2 DOCKET No. 50-247

CON EDISON CALCULATION/'ANALYSIS

_- .. COVER SHEET _._

Calculation Number: FEX-00062-01 Type: CAi2 Entry Date: 1/29/98 ELECTRICAL SYSTEM Project Number: NONE- Modification: NONE Document Page: 5 - " Scaunea: N' OldCalculation: EGP-00L021-00 Revision:

Title:

MINIMUM OPERATING ELECTROLYTE TEMPERATURE FOR 125 VD* BATTERIES 2

1. 22"2 3 AND 24 7-Drawings Component, .' Component .- Style Type Description Stylel  : Description BATT BATTERY BATT BATTERY System Description...

DC BATTERIES AND 125V DC .

Structure Description -

CB CONTROL BUILDING',

.aoe Preparer: R. SULLIVAN / 4 ozo.&t"ýJ1Jp date- Date. Reviewer;:D OHOSH Signter:1~~ 10798 Sigynaifre/Date:

Approval/Date Conifirm. Required?

Required) - "C-oncurrence(If

CON EDISON CALCILATIONI"ANALYSIS SHEET CALCULATION No.- REVISION NO PAGE,.

FEX-00062 :2.

OF .5 PREP ARER/DATE #/$'//f ' . REVIEWER/DATE . CLASS Bruce Horowitz Roger Sullivan Dipti Ghosh

• 1E SUBJECT/TITLE .' I 5 PROJECT No. _

None.

INDIAN POINT - MINIMUM OPERATING ELECTROLYTE TEMPERATURE FOR 125 VDC BATTERIES 21, 22, 23 and 24..

c-D. NO.- _REVN None DESCRIPTION OF CHANGE SIfETET -

Increased minimum electrol1,tc temperature for all Batteries to 59" F Revision Number Description of Change, . Reaso-n for Change (0) Ori-inal Issue. This calculation supersedes " 1997 RF0 Modification Calculation EGE-0002-"00 (OI Increased minimum electrolyle temperature Desinnmargin reduced from 10%to 5%.

to 59 " F. Change in philosophy.on methodology used for.determining minimum temperatures.

CON EDISON CALCULATION/ANALYSIS SHEET - CALCULATION No. PSVISION NO - PAGE FEX-00062 " 1 -

OF s PREPARER/DATE ,, /. - _" REVIEWER/DATE- CLASS Bruce Horowitz Roe r Sullivan .Dipti Ghosh . - " - - 1 E SUBJECT/TITUE K 3 or. - PPOJECT No.

None INDIAN POINT - MINIMUM OPýRATIN4G ELECTROLYTE TEMPERATUIRE FOR 125 VDC BATTERIES 21, 22,23 and 24 MOD. NO. --

" - - None OBJECTIVE '

To develop the minimum operating electrolyte temperature for Batteries 21. 22. 23 and 24. .

METHODOLOGY IEEE 485 Temperature Correction Multiplier.

See Analysis for methodology REFERENCES IEEE 485- 1997 IEEE Recomimnended Practice for Sizine Lead-Acid Batteries for Stationary Applications" Temperature Correction multiplier.

Battery 21 Sizing Calculation FEX-(K)049-01 Battery 22 Sizing Calculation FEX-00050-01I Battery 23 Sizing Calculation FEX-0005 1-01 Battery 24 Sizin-Ca1-lation FEX-00052-01 Batter, 21 Battery Voltage Profile FEX-00053-01 Battery 22 B~attery Voltage Profile FEX-00054-01 Battery 23 Battery Voltage Profile FEX-00055-01 Battery 24 Battery Voltage Profile FEX-00056-01 CONCLUSIONS See Analysis sechion for minknum temperature value.

CON EDISON .CALCULATI;5N/,ANALYSIS SHEET CALCULATION No - . .EVISION R NO. PAGE

. - .. FEX-60062 1 PREPARER/DATE ,//,',r' - REVIEWER/DATE CLASS - -

Bruce Horowitz.- Roger Sullivan Dipti Ghosh - . 1E SUBJECT/TITLE K Mý . .- . PPOJECT No.

None INDIAN POINT - MINIMUM OPERATING ELECTROLYTE TEMPERATURE FOR 125 VDC BATTERIES 21, 22,.23 and 24 MOD. NO. - REV.

None ANALYSIS . * .-. .-  : " .I .. . I -

It is Con Edison's design philosoplhy that in calculating the required size of the battery. we use-a 25% ai, factor. 5%design margin and 5qr temperature correction factors. We also require thai when the battery reaches 90% capacily. we are prepared tw replace the battery at the next refueling outage (every 2 years). Ba.ýed on the fact that a lead acid ba-e\ is relatively stable throughout mosI of its life and that the "knee" of the curve for the batters life versus performance is at 80% (per IEEE 485-1907. section 6.2.3), we do not expect the capacity to reach 85% by the time we replace the battery Litthe next refueling outage. This 85% gives us an additional 5%/r maruin that is not accounted for in our sizing and voltage profile calculations. We wil] use this extra 5% in determininr the

mlinimum electrolyte temperature. The minimum electrolyte temnperature is calculated as jfollows:

Since the 1.25 aging factor is based upon 80% of nameplate capacity. and we will be changing the battery at or prior to 8517r. the aLing factor is I 00/85 = 1.176 To detemine the new temperature correction factor using the revised a.ein, facor, (1.38 = 1,25* 1.05' 1.05') . . .. .. . .. .

T= 1.38/1.176= 1.173 We will add 5% margin (1.05) to the above correction factor to account for any unforeseen conditions.

T= .173i1.05 = 1.117 Bused on Table I ofIEEE-485. thel.nminim1um1 temprirmure is 59" F

'(D,;

6z Std EEE 485-1997

~E~MM~NC~ ~RAc71C~ Fr~~ . -

Note that the~"arpns" rea ired by &31. ajid .o.33ofB ~ 23r,198. are to be applied durin o, ai fication andare not reiatd to design margin.".

Table 1-Cell size correction factors for temperature Electrolyte Eemperatur I 0

(ýF) ý I ý ( C) 35 1.MO_5 40 *.4 4 1.300 15.6 183 18.9 19.4

.*20.0 20.6ý 21.1

-21.7

-'7.

22.8 23.4 23.9 24.5

75. II.000J@ 1ý NOTE-This table is based on vented lead-acid nominal 1-215 spcifcgravryr'Ewever; it may be used for vented calls with up to a 1.300 sp--ific gravity. For cells of other dmsigns, refer to the manufacmrer. -

6.2.3 Aging factor As a rule, the performance of a lead-acid bt=t.,"is -relative-lystable troughpout most of its life, but bzgins to decline with increasing rapidity in its latter stages, with the "knee" of its. i.ieversus prfo-rmance c~urve occurring at approxirately 80% of its rated performance.. - - . . ,

MEE Std 450-1995 recommends that a battery be rep~laced when its, actual petfotrmance drops to 90%7 of its rated performance becamse there is little life to b gaed-by.alIowisfi operation beyond this .point. Therefore, to ensure that the battery is capable of medting it* design loads throughout its service life, the batney's rated capacity should be at least 125% (1.25 aging factor) of the load expected at the end of its s#-Vice life..

Ex.cptiohs to this rule exist. For example, some manufacturers recommnd that vented batteries with Plantd, modified.Plantd, and round plate designs be replaced -When: their rieasured capacity'drops below 100% of

,2Y s.2