ML19312D012

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Proposed Tech Specs Re Surveillance Requirements for Diesel Generator Batteries & Vital Battery Banks
ML19312D012
Person / Time
Site: Sequoyah  
Issue date: 02/04/1980
From:
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19312D011 List:
References
NUDOCS 8002080599
Download: ML19312D012 (19)
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{{#Wiki_filter:., . ELECTRICAL POWER SYSTEMS ~ 5URVEllLAtlCE REQUIREMENTS (Continued), 2. The electrolyte level of each pilot cell is between the minimum and mavimum level indication marks. 3. The pilot cell specific gravity, corrected to 77*F and full electrolyte level, is greater than or equal to 1.195, 4. The pilot cell voltage is greater than or equal to 2.05 volts, ~ and 5. The everall battery voltage is greater than or equal to 125 volts. b. At least once per 92 daye by verifying that: 1. The electrolyte level of each cell is between the minimum and maximum level indication marks, 2. The average specific gravity of all connected cells, corrected to 77'F and full electrolyte level, is greater than or equal to 1.195 with no cell below 1.185, 3. The electrolyte temperatures in a representative sample of cells consisting of at least every sixth cell are within iS*F, 4. The minimum voltage of each connected cell is greater than or equal to 2.05 volts, and 5. The total battery terminal voltage is greater than or equal to 125 volts. At least once per 18 months by verifying that: c. 1. The cells, cell plates and battery racks show no visual indication of physical damage or abnormal deterioration. 2. The battery to battery and terminal connections are clean, tight and coated with anti-corrosion material. 3. The resistance of each battery to battery and terminal connection is less than or equal to 0.01 chms. 4.8.1.1.4 Reports - All diesel generator failures, valid or non-valid, shall be reported to the Cemmission pursuant to Specification 6.9.1. Reports of diesel generator failures shall include the information recommended in Regula-tory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977. If the number of failures in the last 100 valid tests (on a per nuclear unit basis) is greates than or equal to 7, the report shall be supplemented to include the additional information recommended in Regulatory Position C.3.b of Regulatory Guide 1.109, Revision 1, August 1977. SEQUOYAH - UNIT 1 3/4 8-6 d*1 1 I?79 S 0 020 g g.:g g

tu ci-ALAL -urte s 36tla Leu ta e, y ,bORVEILLANCE DFritipEttrf'T5 (Continued) 4.8.2.3.2 Each 125-volt battery bank and charger shall be demonstrated OPERABLE: a. At least once per 7 days by verifying that: 1. The electrolyte level of each pilot cell is between the minimum and maximum level indication marks, 2. The pilot cell specific gravity, corrected to 77 F and full electrolyte level, is greater than or equal to 1.195, and 3. The pilot cell voltage is greater than or equal to 2.05 volts. b. At least once per $2 days by verifyina that: 1. The electrolyte level of each cell is between the rininun and raxinun level indication rarks, 2. The average specific gravity of all connected cells, corrected to 77*F and full cicctrolyte level, is greater than or equal to 1.195 with no cell below 1.185, The electrolyte temperatures in a representative sample of 3. cells consisting of at least every sixth cell are within 5' F, 4. The minimum voltage of each connected cell is greater than or or equal to 2.05 5. The total battery terminal voltage is greater than or equal to 125 volts, and 6. The battery load (charger current) with the battery on float charge is less than 1.0 amps. c. At least once per 18 nonths by verifyino that: 1 The cells, cell plates and battery racts show no visual indica tion of nhysical daraae or abnorral deterioration. 2. The cell-to-cell and terminal connections are clean, tinht and coated with anti-corrosion raterial. 3. The resistance of each cell-to-cell and terrinal connection is less than or eoual to 0.001 obrs, and 4. The hattery charger will supply at least 150 amperes at a minimum of 125 volts for at least 4 hours. SE0l'OYAP - lif'IT 1 3/4 6-12 grC 18 1979

ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIRE!!EilTS (Continued) d. At. least once per 18 months by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status all of the actual emergency loads for 2 hours when the battery is subjected to -a battery service test. The active batteries must be tested during shutdown. e. At least-once per 60 montbs, durino shutdown, by verifyino that the Fattery canacity is at least 907 of the nanuf acturer's ratino when sub,iected to a performance discharoe test. This perfornance discharoe test shall be perforced suhsecuent to the satisfactory completion of the reouired battery service test. 1 SE0l0 YAP - It!'IT I 3/4 8-12a DEC 18 1979 -

EL _Enclosura 2 SEQUOYAH NUCLEAR PLANT DISCUSSION OF VITAL BATTERY BANK AVERAGE SPECIFIC GRAVITY Specific-gravity is only one of several indicators'of cell capacity. However, since it is inherently inaccurate it should only be used as an indicator for preventive maintenance (i.e. equilize charge) not . degraded condition and subsequent plant shutdown. Adequate voltage across all cells (charger setting) combined with a very low and stab-111 zed battery float current provide ample information to determine the state-of-charge of the battery. The IEEE Battery Working Group has stated this case before (see attachment 1)~. This matter has also been discussed between Mr.- D. Tondi of NRC - Plant Systems Branch and Mr. J.H. Bellack, Chairmen of the IEEE Battery Working Group. In addressing the concerns of Don Lasher, NRC - ICSB, as expressed in telephone conversations with him on January 29, 1980, we will reference IEEE 500-1977; it presents a detailed discussion of all factors affecting battery reliability. With proper maintenance the lead storage battery approximately 6 x 10 gponent. Preliminary IEEE 500 data indicates is a very reliable co f ailures per hour of emergency operation. There is no failure mechanism affecting specific gravity that would not also affect other indicators of cell problems, such as voltage and visual inspection. In the range.of specific gravity under discussion, all cells above 1.185 with a bank average of at least 1.195, we do not believe that there is any serious threat to reliability. Individual cell voltage, total bank voltage, average bank specific gravity and battery float current provide ample information on state-of-charge and battery condition. provides the technical justification for an average bank specific gravity of 1.195 with no cells below 1.185. At this average specific gravity the Sequoyah Nucicar Plant Vital Battery Banks have sufficient capacity to meet the 2 hour emergency load commitment. T I.

< = = = _ ENGessemG "e 50CETY 7711280041L p as,ener 7, 19r7 ~ .e.... - Mr. J. H. Bellee's Cleve teres riec t r i c Illuminatina Company P.O. Son 'soun ' CleveleM, Ohio L4101 l TO: Neobers of Pouer Generation Cemel' tee Stetton Deelen Subconsittee Nucleer Power Enalneerina Cnossittee Swbeomal ttee SC.b of NFBC Contlesen: " Corrective Actinne in IEEE 450 197% on Bettery Malatemence" t Decent 'Mt ret tone fras eart nwe seament e or 'he iMustry are ' het t h, l correction ac* lons ll eted in IEEE 'i')O. lW', nn ta' tery enint enance ar e t.ei na interpreted in a rather narrow rest riet tve sense. thus sannecessarily lletting bettery operat ing conditt'wte in Nuclear Generst ina Mtatione. Attached for your review and comments t o e gosition ete'eeent prrvvid'rw backgrouM and tutort el information on these corrective er' lone. Thie show14 provide

  • he boel e for the marked ebenges to IINE b50 197$. also l

siteched. These proposed changes in IEEE k$01975 will be included in en overell revleton of the decimeet, scheduled for 197fi. This date le being furnlehod to you nas for your immedlete use in preperina or revleing Technleel Speelfleet ton for Nuclear Generatina.9tet tone. Fleese complete the altschad prellsinary acceptance bellot to indicate your agre**vot to our spyroach. O Rettery Work ing Crov3, Ste t t on De s t an %sbc omel t t ee Power Generatinn Comalttee &ta. J. M. Delleet, cheleman (f A T1[f ' 'Vf0M'A $W f

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Peer Gmeerettag Committee Sestecher Pl. 19ff STME OF CEARDE OF IAAD STORAGE BMTERIES Beeest ledtretless from vertous to of the lodustry are that the corrective eetions listed la IEEE 1975 are belas laterProted to a rather I marree reetrietive asese, thee meeeeeeerily 11eltIas bettery operotias ) esmettlose et seeleer sneerettes stettene. ~ The eerrective settoes listed le Boetten 3.4 of IEEE Standard 45017T5 are meest to provide optimum life of the bettery. They were est aseet to to tehen se mettees regatred to guerentee that the bettery le esopletets charged et ear gives time. The fellestag laternettee pror14ee sees technical beck-ground en these potete, provides a more occurate messe of detetsteleg the state of ey of a bettery ableh hee a speelfte gravity gradient (see peregregh A-11, and provides the beste for ear proposed changes to IEEE 9tendere bS0-1975. 1 A. 8sselfte Grarite EfabetafC$nanimp 1. It le morest, entle rechergias a bettery,for high specific gravity culphurie seid to be generated. This neid will elak toward the betten of the ee11, reselling te e speettte gravity gredteet whteh f prv # sees a lee reedlag et the top of the cell. Therefore, it to assuel for the state of starge se tatleeted by the opoelfte grevity [ et the top of the cell te leg betted that ledicated by the empere hours of reeherge current. Charglag voltage Itaite de met ordtaarily j eller coeugh reeharge estreet to provide etelag settee. There fore, this gre.iest -siet estii cor,oet .,.iff.sia.. c j Power ud Life l' ny 2- \\ 4

of. -.,e t* f. Boterminime State of Chares When A Soeetric Gravits 9radient Este$s O When the ee11 to esetamed so that speettle gravity readiese een be ende et the toy, middle, and bottes of the cell, the everage of these three reediese 9111 eeenrately reiste state of sharge to the fell eherge specirte grevity speettled by the seenfesterer. r The patters of etarstes ewrroet delivered by a convoettamal "constest voltage" eherger after e discharge provides eastber method for deter. r L steles state of sharge. As the eelle approach fell eharge, bettery voltage ricos to appreseh charger eetyst voltage and 44e thorgtes ewrest desreasee Whom the ehargiog eurrest has etabtimed at the i l etarglag vollego, redese eberger outyet to *eerne1 riset voltage *. After fleet h three the bettery steh111:ee et this weltage, the aegoes hears tesowed daring discharge have boom restored. 3. Effnet af fesseratere eyeetfte greettr rossiege are hosed se a tesseretare of 77'f (25*C). r l The reediese meet be ese1reeted for the esteel electrolyte tmeyeretere. Per seek 3 degrees Fahrenheit (1.67eC) above 77*F add 1 potet (.001) l to the readies. Subtreet 1 point ter each 38 Fahroeholt below 778F.

i. if>het of = tre1rt m i The speetfie gravity of the elmetrolyte to e cell will increase with a less of eeter des to electrolyste er eveperetten. When spoettle gravity reedtage are Nies tekee, the electrolyte levels shoold alas be measureo est reeer d. The bettery meneraeterer etil prortee a perity eerreettee fester fer the partienner eel 1s 1svelved.

The apparest electrolyte level depende se the shoegtes rete becesse gas gamerated daring chargieg esesos se eypasset espassise of the e enestrolyte. If the eleetrolyte le et er meer the his 'evel each et fleet voltese, it any rise ehese that mark en eherge. Thte eensities le est ehjeettenable. It dose dietete, nosever, that eleetrolyte level reedtage shoold be endo enly shoe bettery has been et fleet voltage the et 34eet 72 heure. S. 9fftei et Enter amitions Whos ester to added te a sell it tende to fleet en top of the slee. trolyte beesees ite spoeifte portty ie 1.N 1e eeagertoss to 1.715 esetant for the electrolyte to eset betteries. If the eetle are to ) e merest float ohnogo eendittee, there te very little easies of the electrolyte des to seestes. Io certete ee11 type it ser tehe 6-4 seste er lenger for esepleto eastes to esee. Too opoelfte gravity ahes&d be reed befere adding ester er the bettery shamad be gloes en egen11eing eherge efter the ester hoe been etted. The bettery shamad w bash an essent fleet vettage for 7 heere becero asenertes the opgelfte gravity after en egaalletes esarge. = f. seF -qtr - 10.11 at attechnent 4

I t I ): \\ e 3 B. Flaat Voltaas r - ***g 1. Lee Tellamo Colle l l. - ' ' r.] l'- r Cell voltage le est, by itself, as testeetiae of the state of chasse et the bettery. Preleased sporettes of celle et say, then.04 volta .l botes the esseresterer's reeenesedad miniese ene redeee the life i espoetener of these eelle. If seeuel life to to be obtateed frao these celle, they oboeld be gives as egenlistes charge. F. Esk Taltaae Colla These is ao detriasetal affnet seeestated with e cell that has a fleet voltage higher thee the everage of the other eelle le the bettery eseoyt far the estreme ease shore the cell poteettal egnate e er eseeeds the gemeing pseestial (2 38 volte at 258C). If am 7 ogeslising charge is gives to the bettery, the fleet voltage of the other colle will be leeressed and the fleet curvest et11 he doeressed. Tkhs doerease etil laser the voltage of the high cell, h This comettles ese aloe estet ebee a few ese celle are added to as old bettery as replacemoots. l

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,e o o IEEE Nti 4fe 1975 MnittED FoR. Pto Po.sw I479 Revd8M. NON ~ Pea:Tiew J ratr an=r O F 9 'J i - 77 J. IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for ) Generating Stations and Substations n i ) c. s-.. j Pewer Generation Committee of the IEEE Power Engineering %ciety p ~y ) a I \\ \\ = c,. s n o s s, l. } TheIngitete of Electrical and Electronics Engineers. Inc .l* e ,i :)..,..................<. ~.....,. ...,...,,..........,.,w...,. l r l l }. h 1 ll j I i b

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1 3 Mainteence 7 Jfl C e evel 7 $2 SdfHy 7 )3 ' epeetene 8 I s errettive Actsons A l 'L l wee 4 m ya 4 Lapacity Test Schedule 9 4 i Acceptaner 9 4 2 Performanse 9 4 3 8ervice 9 l i 6 Procedure for natter, Capetit, l'est. 9 6 i Initial Conditions 9 6 2 Test Length 9 ) 6 3 Test IM herre Itat. 10 6 4 Acceppee and Perfr.emame I ces Description 10 66 eterminens llettery Capauty 10 6 ervice* Test Description 10 6 7 Resenrossen il 4 Hottery Herla ement Criteria 11 7 Heco<de iI m 8 Standards Heferences 12 74111 F ~- TableI t'eparity Currection Fartar K. for Temperature. l et Variances te 4tandaril 15'f' t*7'F) at I flour Through a linur Hate thwharse. 11 l 9 I s ~ A i ( i e. 1 { I l

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a. s o. ~ IFEF Ss. / TEWylefC. AND IMP 1,ACFbf) N OF t.,AttCF. t#AD FyON At,lt HAfrFHlF.S 4l.411r *. (9) Cwrect any other abneues I condstione cornpletion of the Installathen This le=1 se a sosted. test of the bettery to delsvet the elesign re y -- r-guiremente of the de system This test es ce e foerned foe C3. sos t E nuclear power gen. raine - 7

4. Capacity Test Seinedule statica b,n nee e. peri of the p,,operain.n.

j Q g w and peseodic de system tests described so 1 (1 G The fedewing schedule of capacity tests is IEEE Sid 308 1974 ff the system at ure. { 7 used to til test the battery to descenon, chanen the neer may he seguireit to set - f whether the haltery meets its specificaleon or this test to meet regual:In alson requiteenrnt- [.' ' yea rnanufacturer's rating or both. (2) peri. l .J CE" nelly test to determine whether the ratma of y, fg g the bettery, as found. es hol.hng up, and 43) of g required, test to determme whethee the hat- ,g gd tery meets the design reinnrements of the sys.

6. Procedure for flattery tem to which et is connetled p

.g. M g ,e, 4.1 4eeeptance. An acceptance test of battery ImlI 4..'.es g capeesty (.8tection Si shouhl be made either et This procedure describes the recommen.h.t e-g ' the factory of upon imtsal enstallation as de. practice of sapacity testing Isy dischartmr il. ] ,I termined by the uset Tlie test should meet a battery for nuclear powel stations use...

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eyesific discharce f ate.ind durateen relating Cl.eu IE butterws, also sefer to IEEE St.1 :t/. g I to the manufactierer's eatteig 1974. Stand.sid for Quahiting Class l E l saue; P ment fur Niselear l'owce Generating Neatn.n l %= 4.2 %mme All testing should follow the safets s.r. g fil A performance test of bettery capacity enutions heted in Sectenn 3 2 g (Section Si shouhl be mm.le within the f.e t ? a I ''''''''''~~'*""h'' described usedet Sectmn 51. omitting ergisire t he imesal regesierments for all batter,...st.. g g mente (il anal th Ilesults of this trol tellect Ily tests IIcquiresnente til stui121 should su t

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he completed for " performance" and M., y 5 t ee g mine bettery cap.1lnhty It se dessemble for vice" lests as discussed in Secteene 4 ? It g 'E* q cornperteen purposes that the performnnce erwl 8 6 y lette be similar in duration to the hattery me. tl} Verify that the battery has had ar-l* ( $ ceptance test t$ections : 1) If on a perform equehaing charge completed.'l days to a me, m e ) { *O ence test the hattery does not dehver its es preer tu the start of the test. [E pected capacity, the test should be repeated (21 Cheek all bettery connectione and mal. 3 "( g.T efter completing the requirements of Sections [ oute all connectore are clean. figlit. and free. h S1(Iland(21 certosion M (2) Additiornal performance teste should he (3) Itead and ferned the specihr rf avity nw' given to sot h hattery at 5 year entervals tantie voltage of each cell sust praor to the test = = " *,. 3

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O Secleon (3) tery electtelyte for en avetare temperatis./, j ,s e j

13) Annuel perfarmance teste of battery ca fougerete.f every esath cella (Si lieed and record the battery termen$y

[ I e3 petity should he given to any bettery that f ehews estne of degradelson et hee teached 45 voltage g j peecent of the estvece life espected for the op (6) lhoconnect the charset from the bat e pHeatleet. Degradation se andecated when the tery sb bettery cepeclay drepe more then to percent (71 Tehe adeguate precautians touch no in.. j of poted capecity from ses avetese en previetse Intang bettery to be tested from other h.1ttern. I perfeemence teste. or so below 90 percent of and erstice'leadst to ensure that a failure we ' the manufacturer's reteng not keepardiae othet systemu or equipment { 'lh 4.3 seeeeee. A aerwee test of battery espectly 8.3 Tewt length. The recomtnended proce (Seetleen 8 41 may 1.e required by the user to dure is to mehe a capacity test for oppre.s. j meet e specific applicat6on requirement upon mately the same length of time se the criterat 1 4' 4 v. m - " ~ - ) Q . " ~ t i

Attach::nt 2 STEPS USED TO DETERMINE MINIMUM SPECIFIC CRAVITY 1~. Obtain maximum ampere requirement for each, battery bank from FSAR Section 8.3. - 2. Using the ampere requirement from step 1 find the time for total dicharge from Figure'1, "Could TCVS-AMP / positive plate". For ~ Sequoyah, divide total ampere requirement by 14 plates. 3. Plot the points obtained from Gould (Discharge time vs. specific gravity. drop) to obtain Figure 2. " Discharge Time vs. Specific Gravity Drop".~ - 4. Using Figur'c 2 and the discharge time obtained'from Figure I calculate a specific gravity drop to 1.75 vpc at 77'F for each battery. Subtract this value from the nominal 1.215. ~ 5. Graph the specific gravity drop for each' vital battery bank starting at a nominal 1.215 and ending at the discharge time and specific gravity calculated above, see Figures 3 through 6. The discharge time for any initini specific gravity under emergency loading can be calculated. 6. To meet end of life requirements, multiply the discharge time from an average specific gravity of 1.195 by 0.90 (90% of manu-facturer's rating) and ensure that it is greater than 2 hours. m-t'V W-

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  • 120 i

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  • i-AMPERES / POSITIVE 4-

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  • Figure 1

" Could TGVS-AMPS / positive plate"

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x. a._ i i i m 7 i j t__ r_ .t _ _. _4.._._i. f. l q --i-- MANUFACTURER'S DATA. 3 l l 1 .._ 4 ___.1. .i .,i 4. a., s ._4.a ___._.___.a _o_ ;....... qli'_ p! l-l l lA l l l. i Discharge Time specific Cravity Drop j r --- ~. 'M --t- -P e--4----------- 8 hrs. 0.105 l [ ]_ i t l t t l j _. _._'. _L __. -. - q _ g g L. ; _.p -.t__. . _ p. _,i. _ _.. _ _.t 5 hrs. 0.085 I-l p._... !,9 I y .p.. p..t. _ :.. i ,l.,. .. _ ! _,l.. 2 hrs. 0.060 i , _ _ 7 _.1 l t i l O hrs. 0.000 q.. } i i 1 4 1 ._._ _. p.4. __ _ _. ... + r..__...r. 7 j. 8 ..___p _.._ _ _ __ i.. _ {._... _ a. L._.l_ i __ u_ . L.__;_ _ L _ p l l i I i i a i .. -....i.. .l._ _ ..,._.L. + . _.._._ _ _.6 _ _i i___..__ _._... .... r._ _. i 4. 9 _7 i l t i i k , -- 7 } - - - *- - - * - - - p - - . f. _~ __ 7. _ a._.. ___.._;_.__ _._.. ...a__.--- r -- p-- - - -- A - + - - - - - -

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u. ._ m pu 4 i e 4 i, _i _ g _: .u_; _2._. I7i p. _7 __ t _.._ _. +. ' _ _ + 1 t l l. .__.. m.. ( ( /g Vital Batt. III L- .2 d mA . _. _ _ p_. _ _. _ / [ i Vital B;tt. IV - - !_ _ ._- _ m 4 t i t .p._. 3 --m--- t 4 t t. t, j e i i i 3 ja i Vital Batt. II --_-------J +.- L--. i M [--

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. 60 70 80 . 90.,. l. o_o _ __l_l. o.__.__.i i t_,._ __! y _. .!_I I l _..,t ,! _. q I 7. _m____. i _.._ ;..._ [ l1 .g i -._a_ } _ l.a

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'. _.. - S.G'. -DROP FROM 1.215. ( x 1000 ) a__. L m__;~ _._. i I i i i _.. ; __ ; _ ; _ ; _ t. _.4'._...... L.

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Discharge Time vs. Specific Gravity Drop _Sequoyah Nuclear Plant Vital Batteries"

,. [ i .._ s.. _ a.._. g + i r ..._. _ y ~ - t t e .m h e e i I f i l .f 9 ~ g. .i _ _7 _ _. ~ _ 3 ,? _ 1 2 __ _ a_._ l 7.- } l l i l 'l l 8 l l f ~l + _. _. ~ _. I I I l i E [ I t } l } t { l I_I t

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? .l i i 4 I _t__ i j l o l x i i l t i 5 1 } } L -- 6 i j r i i t t + i j . l i w nl.210 L- ? f S I- --- l~ i l t i I l I 1 e - } __ .j j.._.__, q_..._. L __. ! { L__{_ .L 4_.. i i l q { u __ t l q _. __ t I i ,.2. 46 hr. E i l 4 i i i .I 7_-_ y.1 goo' p' _ .i _u t t 1 i + - 2 x_. I.. __ _I. - I 1 i i i . _ J _ _.i - _..- @ 1.195_.. Average S.G. _at Start and 5._00 amp Continuous Discharge i I. ( i i l a 1._7._ _ :__ __,__ j;_ _ _;___ :_.. _ _ _ _ _ __y_ _L__! e_L __.t t i i 1 i _1:190 r9_ ..___a _.. _ r ..{..l 1 -1.185 min. for 2 hr. discharge.__'_... -- _-. u __ f __j { 4 i i l h .7 3._.- -. . Y l'180 - + - ; - b L -- - - L -, - -- - L-+---. l.. _. _ _ _ .. __End of Life (900 2.21hr. i.... i os-i j { L-l i .._t... .u_,._._._._..__ 2 I ~g 1.170 F-y 7-a-- - ---- - -+- - - - l---q - - -- - - -f - - - + - - - i t _ _.!. _ _,. t.___. _.'._.1, _._._ _... i t' i i 4 ._ a 6 . H i i t l i t c 1.160 ' p u - 4-o 1 - j A '- -_ + -. , -{.l _.

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. _ L._ ? _ _ 4 l l l i t i I _l l 1 l 4 i e i + 3 i L._ L__ '..j _. '. _. Figure 3 Specific Gravity vs. Time Under Emergency Loading-Sequoyah Nuclear Plant ...-.f-- {:_- ; _. --._ I__._ .J_. t i i t i i . _ q_ _.... i - - Vital Battery Bank I" - -f--+- --j-- ;l --- i -~ -- F - - * - -4 7-1 { + i l i ) I i .__._a_. L ___ ; f i l 6 i i l t .l l 1 y .__.s_. I I i l l I _ _ __ f.__.___._'_-._t_ 3 s

i I i i i s i i I l 7 I 6 19220 --? I ,i i i I i I, { j i - . i.. * ' l' } - I' I' e i l 5 i l t 4 1 4 i i i -.. v i i-i i i j i i l i i t f r 1_ __ 1 5 4 s I i j { l - t--1. 210 U -- i - i- -+--; -h-- - - H-ed-i - - -- - - - - Al t, b - "L" i 1 l l i. i t e 3 ...._.-,.-_._i.._,.___..__,4 4 t t i l t j ' --+ y i g i i

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- - -.-8 . _ _. -- T. 200

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e-- i i 3.23 hr. e 1.195 Average S.G. at Start and 420 amp i.; .____m. . _. _.... I 9...-- - Continuous Discharge - - --- +-t r a-t t . _; 1.190 -.x x.4 a i. t t a_2 _u..._._._.___. ..y ....__r } _._.___...__,_2. i i t.,_._. ..... 2

  • 1 r

i i 1.172 min. for 2 hr. discharge End of' Life (90%).2 91 hr. L.,_._ e... a..____..__._. ' 1~ 170 d, - M - - - b, ~ i ,os

, _ i. -_..

O g j t i l .-1.160 u ..--_a t f u .__a._._ .. _. ~. 1.150 -- l w-w..,_ .a. 8 I 3 .1-1.1h0 ._- L. l i r i 6 s - d -- - . _. _ _.1.130 j i - -- - - - w._ . ~.., _ > _ _. - .z .. : -l'.120 i - - g i 4 e _. _ 1.110 _ A n._ _ _ _. i i i 4 i 2 . _ _ q _._. w_ u._... _. 2 hr. t t t i _.7__.. o. - _j _ _ L. 2 - =- 3 . - -- 4 -5 "J------ -~- 1 I- - s 4 i i . 4 H, _ __ p_.. HOURS -- - __..J i 4 } . a __h. .a_ 6 [ I l [.. L. Figure 4 " Specific Gravity vs. Time Under Emergency Loading-Sequoyah Nuclear Plant _ _ _ _ t i I l l i IVital Battery Bank II" l 1 I i i t l i i l 1 l i e .a _ a + r. l 1 I I I. f l I I l ff! _..._p._ _ _ _ _u l I I l i i i + i l f a 4 l j F I i j .) e i n i j t t j s 4

l i i .m. i i i j i l I! N 220 I l l i-l-l I !. b 'l l-h j 4 i ~ ' ' ~ I y_._ l l l i j I l l i ^~' 1 ,i i t r t i. ] l t .a [ 7 y;.210 d--".'~~-.,'-'_.~_,~~:,#-'-- - i l-- ' - - ~ ~ - - " ' i - -~

  • i i

-T, ~ ' ~ ' - ' ~ i + 1 I 4 ... _.,i. __ _ - i m i i I i. L..y. 1_. _..___t I e ) i ..d ( i i i 3.67 hr. I @ 1.195 Average S.G. at Start and 390 amp 6 _ __ 7_. g._ __ _. l 7 ~ ~ :- Continuous Discharge --- ~ - -- .._.!.... _ i _ _4 I _._.t__ _ _ _. _,. _ _ _...__.r__._._._. t i 4 i ,.. _ y _ _. - _ _ _ _End of Life (900.._..... ....u y* g . _ - _ + _.... 3 3o hr. J ... _ _ _.. _ _ _... _ _ _ _. _ _ _. _. _ _. _ _ _ ~. _.. _ _ _ _ i g l.166 S.G. min. for two hr. discharge 1.170 '~" ---.. - - - - - + - r 4

..4_.

r. { } l 3 8 .._-___r.._.______._ i 4 s .en 1.160 -"^~ "~~'~ ~ ~ - ~^~ p _ _ _ _ _ _. ~ ~ ~ ~ ~ ~ - - " * ~ - ~ - - - - ~ - ~ ~ - ' - - - ~ ~ ~ - - ' 1.150 - '- ] ~ ~ ~ ~ ~ ~ - - - - - - ~ ~ - d- ' - - ~ --~r-- 1.140 -. __ y 4 l t i f -F f '. ~ -' _J __.___.__a._..... ~~-~1.130 ' -- ~~ - - - ~ ~ - - ~ - - ~~ ~ ' - ~ " - ~ ~ - ~ - ,._ : _. p._ t i .{ g -_.L._ + 2 hr. .t i i s p__i .+.

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4 5 i.

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--b _ F1gure 5 " Specific Gravity vs. Time Under Emergency Loading - Sequoyah Nuclear Plant 1 ) .'__,___.i_ _. _.. _ _ _ _.. _.. _

_ i

) I ..i. Vital Battery Bank III"_ _._.-._i._._ __.._ _ _ _ _. ' _ _ _.. _.. _ + g i k r_ l...f... ___.I __j* g g l' i [ 0 I f g i I _{ __._ __'_.,.___4 6 I l' ( __.I.__,t _._.1' I { l 5 I I _.,l, _.[. !.!_.l_l l !.._l _I! l l I I I l l l I } 5 ! ~! I I l I i i i( i j i i i i i i i [! (t i i i t (l 1 ir N'"

l-i -t i il i i-I i 3 i t i. 1,22o ! 'j .l-I' !I } !1 I. i l l !1 i l l 'l J.-l~ l.* s*i. 1 ._.__ t t i i ~ l i- } L..- - t -1.210- - r-- - -- - a -L i t i !*J t i ) t' L_ .a_ __-.. _ - _...-. _ _.,i _ u._n._ ___ _.._... z _.__.____.. .m .i_ t l t i i i i I t ._ L-i.200 -hL--. i. L --. -. I l l 4 -- -- + ..u. d I i r r.3.39 hr. -@ 1.195 Average S.G. a.t_S. tar.t_a.nd_410 ampm. _ _,._ __.!... i l ~ _ I__;I I i II __;_ Continuous Discharge i- ._. 1,19o _g. 7.,_ t l i _..;. 7-. 4 m_ y . _ _ _ y _q.. ..._.._.4_ I ..- 1,180 L 4_ _.L _..... L... -.,___ g. . _. _.. - _ -,_ l. uL-. _w = i ...__.t._.. ~ 1.170 S.G. min, for 2 hr. discharge -... E. nd of_ Life (90%) 3 0_5. br._. .. -._ l.. 1,179 4 g_ . _2 __4 !-__-._.i. i t 6 -.,. 1.160 L L-b i 4- - - - - - - - - - - - - - - -- j- - - ; - i ,o. ._p_.._. 1 1,190 .i 4 1 -F-1.140 -'----u-----~- _.I _,! _.t _.. . r.!.. _, _. '. _ _ _ _t - j i r _.. _ +..._._. _. _ _. t t .t i i 3 + 1,13,o + _.7_ _ p. __4__ 4 i 4'._.,i t i .._i. - h } ,t 9 f I t 1,120 u.wg .7 ._-..n. -._u._. t i i ._ i t ( I ._..___L-..__._- 1,11o 4 .p.. p.. ; _ q _. ; 2 hr. t .._..__.m i a + 0 i 1 i 2 3 4 5 i e-i i H. OURS ... p._. ,___7._. i i . g g,._. }.. _9, _ _, .r 2 i i i i .. _, 7... _.. g. _._... ) 7,... ...__._-__q._._ { g 1 t .. i._ j a_4 lFigure 6. " Specific Gravity vs. Time Under Emergency Loading -- Sequoyah. Nuclear Plant _i, .g! Vital Battery Bank IV" i 9. . 4 6--. g ..-<.--=+.g.e. b.. g,, 9 _, a. 7 f. _.g__.,i_ _ _ _ t a __._ p _;.__.f_

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