ML20012E108

Forwards Calculations Verifying Operability of Facility Dc Battery 111 W/Only 57 of 58 Cells Functional & Onsite Review Notes,Per Request

ML20012E108
Person / Time
Site:	Byron
Issue date:	03/21/1990
From:	Schuster T COMMONWEALTH EDISON CO.
To:	Murley T Office of Nuclear Reactor Regulation
References
0811T, 811T, NUDOCS 9003300078
Download: ML20012E108 (14)

Text

{{#Wiki_filter:z s 1 tyco g j,.,; i ' (;/.Mw'h : Commonwealth Edison - /* i. y - 4 / 1400 Opus Pisce, ~' bc Downers Crove, Illinois 60515 - j._ March 21, 1990 Dr.= Thomas E. Murley, Director

Office of Nuclear Reactor, Regulation U.S. Nuclear. Regulatory Commission Washington -DC 20555

.- \\,

Subject:

Byron Station Unit 1 DC Battery 111 i Operability Calculations NRC Docket No. 50-454

Dear Dr. Murley:

j Dr. S. Saba of your Electrical ~ Systems Branch has requested a copy of calculations verifying the operability of the Unit 1 DC Battery 111 with only 57-of its 58 cells functional. A copy of the Architect Engineer Calculations and Byron Onsite Review notes are T attached and fulfills this request. Please address any questions that you or your staff may have. q concerning this response to this office. Respectfully. -l ,;.l T. K. Schuster -Nuclear Licensing Administrator . I At taciunen t I l l cc: 'Dr.-S. Saba - NRR (l P. C. Shemanski - NRR l Resident Inspector - Byron 0811T/TSK:wj l' V i })t \\ 0 h. f1 9003300078 900321 L 3 I I \\ ,. o - PDR ADOCK 05000454 l.: p PDC 1 l: l L

wpx n-c; -7.; 03R 90-076 ll This On Site Review is beinD written to address the operability of the ill Dattery with only 57 cells. To maintain a bus voltaDE of.105 VDC an individual cell voltage of 1.84 is required. SarDont and Lundy performed a calculation to verify. for_ an individual cell voltage of 1.84 that a NCX-1200 bat tery would taeet the operability requirements ( This calculation is etteched). Come questions with the calculation are addressed in this On. Site Peview.

1) In the calculation a correction factor for temperature was used for 69 F. Technical Specification 4.8.2.1.2-b.3 defines 60 F as the minimum electrolyt e temperature. With E0 F as the minipura temperature the correction factor per IEEE 450 would have been 1.11. With the correction feeter for 60 F the calculation at the bottom of page 3 of 6

.of the et t ached 58L let ter in: 4.5

• 1.11
• 1.15
• 1.25 r 7.18 Eince the NCX-1200. battery has 8 positive plates This calculation

-provet the battery. voltage would reraain above 105 during the load profile.

2) With t he' temperaturo correction factor for 60 F the calculation with L

the battery crosstied(page 4 of 6 of the StL letter) is: l-5.0

• 1.11
• 1.E5 m 8.04 Since the NCX-1200 bettery has only 8 positive plates the battery would-not maintein the bus voltage greater than 105 VDC with the crosstie breakers closed. To insure this does not occur the Crosstie breakers nill be taken 003. The Creastie will or.ly t:e used if the actual electrolyte temperetwe in greater than E.5 F. With the correction factor for E5 F:

~ 5.0

• 1.08
• 1.E5 T.33 The NCX-!E00 ba tery mold naintain 105 VDC during the load profile L

'with the battery cecsetied ab3ve 65 E t-i l;

3) The colculation in thic CEL letter are r.ot based on the maximum load L

profile in t he UF91R. 'finL %ed the load profile reflected in the DC .alut in the DC ELMS prograrn reflects actual plant PlM3 gugram. The K lead. The DC EL*G,"v'grai is 6 docunented program of act ual plant [ lcads. I r L h i y I-

=

i l-t~uaawa-.

~9 y(,;,- q =< .:..m 3 _g e g T(-D -- j -qaj t ...j 4 A concern wn brought up at to would the bettery meet the load profile defined'ir,the UFG4R. The followinD calculati.on assurned 1.84 volts per cell and 60 r; electrolyte temperature. The design' raargin correction fsetor was

t fl.

not' und in this calculation rince the DC ELMS proDraro shows that. BUS 111.is ] ~ below itie UFSAR load prc file. -if -{ BATTERY 111 LOAD PROFILE WITHOUT CROSSTIE {; i 41 60 F cell voltsge 1.84-4 -i CHANGC IN' i d (.L LOAD . l. 0 AD AMPS /POS POSITIVE PLATES. 617-111-5.56 - J r, ? L k TOTAL 5.56 i y 3 k k 517 79;4 7.77 f 354 -253 79.9 -3.29 ] k TOTAL 4.48 i k !L 617 43 14.35 r 354- -263-43.5 -C.04 ) A ] p 15C_ -202 50 "4.04 L TOML 4.27 ( m J E1/ CD 20.04 -p [L 354 -263 28 -9.39 i. 7 i -152 "20o '0. 5 c,. 62 -55 -97 43 -2.26 f{ TOTAL 3.77 j y a ~ 5.5G(positive plates)

• 1.11(tcuperature correction for 60 F)
• 1.25(aginD j

i factor for 80% minimum capacity) = 7.71(pesitive plat es) Since the NCX-1200 han 8 positive plates battery 111 would ruintain the bus -voltage above 105 VDC with 57 cells using the UFSAR load profile without the j batt ery cretstied. -l -l I Thic On Site review finds that the ill Battery is operable with 57 cells. 'i b j h j te J ta l a 4 k I h, ~ a g %uaw.wx2 3

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- f ' UTILITY : COMMONWEALTH EDISON - PROJECT NO. 9949 STATION : BYRON UNIT l' b 'DATTERY NAME 111 1DCS1E DATE : BAK' PAGE s.1 OF 1 '{"<--l9'D-IS '? 1 2 3 .4 .5-6 7 PER- - LOAD 194 CHANGE IN DURATION -TIME TO ENO; T MIN RATE ' ti! ZE - (3) / (6) pg.Q IOD AMPERES . LOAD OF~ PERIOD OF:SECTION. R(T) AMP /POS. POS. PLATES ~. pg. 4 o ( 6 LOWEST EXPECTED ELECTRELYTE9 MIM CELL VOLT CELL MFG . CELT _ TYPE: SIZED BYs TEMPERATURE

69. Degrees F-

1.81 Voc GNB (bOULD)

' NC M NM* b t2 1 A != 562.t A 1-S = 562.1' M1= '1 T=M1= 1 ( T s = a da. e

4.39

. TOTAL = 4. 2 O C-fc M.e a l.M 2 A 1= 562.1 Al-4 562.1 M1= 1 T=M 1+.a+M 2= 50 H(i = 8$. 0 .613 A 2= 374.5 A 2-4 1= - 187.6 M 2= 29 tem 2+..+M 2= 29 R(T) 86.3 e.175 O T AL = 4.438 3 A != 562.1 A1- @ = $6?.1 Mt. 1 lam 1+..+ 3=1h0 RtT)= 4t. '12.220 O A 2= 374.5 A 2-A 1= -187.6 M 2= 29 .T=M 2+.a+M.s=119 R(T)= 46 -4.959 A 3== 191.7 A 3-4 2= -122.7 M 3= 90 f=M 3+..+m .s= w. RtT)= 5.e -3.448 4.714 T AL = o, h 4 A 1= 562.1 41 - @ 562.1 Ml= 3 t e m - 1 +.. +M *.oo Rti 23.0 1. 14$ 4 = A 2= 374.5 A 2-A 1= -187.6 M 2= 29 T=m 2+..+M 4=239 He >= 29.1 445 O A 3= 191.7 A 3-A 2= -182.7 M 3= 90 f.M 3+..+M 4=210 T)= 32.5 -5. 3 4 4= 123.7 A 4-4 3= -68.0 M 4=120 T=M 44..+M 4=120 (Tp= 46.0 - 1. 4 i TOTAL 5.83 = (; max 1 MUM SECTION SIZE (JNCORRE.CTEJ SI E,(UCs = 5.64 5.84 = G us x TCMP. CORR. A DESIGN MARGIN R NGsPG FHCTOR - MINIMUM REQUIRED SIZE 3.84 X

1. 9*

M-1.00 x 1.25 7.65' = (. MINIMUM REQUIRED BATTERY SIZE ACTUAL DATTER1r SIZE R:iMAINING MARGIN 8 POSITIVE Pr.ATES 6 POS111VC n.AT EG 4.6 % 0 l t-( 4 r l l .zy .,m . ~ L,_u__._.-.- ..-_s.~.___.-_,.

JUN 2 71999 l f, I t SARO N T4 LLM OV TRANSMITTAL OF 0A RECORDS - af. To: OA RECORDS SECTION, Mm. 3 I Y 3 3 "" "I Name Room No. i 4 i ). f. GrA L A A/ / 3 D 3 GR AMD'i s 25 PV9 6FEB \\ / o,,b,,,n 480//' 6-27-S9 I % we, o, Transmined herewith are OA records in the (POR OAD USE ONLY) quentklee insteated below: m GUANTITY TYPE OF RECORD OTY. REC *D. EY QAD CAcc # 19 D-IS-Hard Copy Records 'D REV.O (Pa0es) ]" S&L Aperture i .:t.? I Microfiche ..I li Jackets l ..5 '33 If project number above is non-billable or closed, charge tNs transaction to Y)h *Ob

• 8 NOTE: Each record sha be identified by project nueveer, name or somnym of the division responsble for the record, file index i

nurther Wie, dels (approval dele or dele of leeue). The erstem, subsystem and component nueveer, u appilosble, and the espety eleted identmoetion, r required, ehen also I en leernmed. 1 e (FOR QAD USE ONLY) f Amenhed reconis have been microtumed, indeed, and stored. f Trenandmed quency not romelved as indiosted. N l Trenamthed reconis not poporty identfied, i - Conect and Roeubmit j Tienembled reconis not le0ble for filming. Trenommed recent not sever hande. p r] nos.r e scheduisd.or,recosain. O oner: / -) d. gu h,,,,.3o9. Signature Date l (OAD Records Sedion) ( l

OAOOGNT Q LUNOY I "" **I ' u w

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MEMORANDUM OF i ^% f TELEPHONE CONVERSATION .u, m f Date:

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-A U*O O Time: .;/.' 1a 7 h MS l OM G t V* 6 og Person Called: (Na*@ (Company) b Yuktbs k $1 L- [ Person Calling: e og (N'ame) (Company) [ t Project No.._.b ddl.-62 f ,/ br f^ Project: to^ I 3a {kry N* X - 12cw Subject Discussed: 5 l Summary of Discussion, Decisions and Commitments: , AcA+ L lA C, w 6 % w. sac T c-o cn n 1. rede. k 1.X/o,c b 4ke sa,;nt bo h m, (. k

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f, . p.. /,, 1. . ~.. r, ..C;morandum of Telephone C:nversation SAgggNTS b5NSV p cre 6 89 t~ 11: 30 .,, c-c e,3 l ceece, Everett Widner GNB (215) 750-2748 r,..e c.m ca co-ra,< Barbara Kutchik l S&L (312) 269-7018 as#ce 's"oicet uo Byron & Braidwood 8226-03 sue,ect o.scssseo Battery Type NCX-1200 Characteristic Curves TC-107011 b ry. C'fiumm;ry of Discullion Dett6eont and CommitmentsI asked Mr. Widner if he would explain why the two curves do not ..m., '.3 provide the same values for areas in which they overlap (i.e., below [L .ar.: a 1 hour duration). un N He stated that curve TC-107628 was developed using a pilot cell, v.a b whereas the curve is utilized for the entire NCX line, and therefore, inaccuracies can be expected. In part due to the offects of intercell resistances at the higher discharge currents (lower time durations). In addition, the TC-107628 curve was developed to enable GNB 1 battery users to obtain intermediate discharge currents (e.g., a18 f. minute rate or 6 minute rate). Since this curve is based upon percent \\ of the 1 minute rate to 1.75vpc, GMB recommends that the 1 minute rate be obtained from their published tables and not be extracted from the Again, as at hijh discharge rates, various resistances can l curves. l significantly affect the data. Finally, curve TC-107011 also utilized a pilot cell, although the l curve is for both the NAX and NCX cell lines, and the same explanations l apply. ,;M2h tser A. Runde 1 1 i ~ F d' 7A 4 ,5 carv~ B. A. Kutchik st.no 50 84-0 7 PAGE IofI

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