ML20077B850

Proposed Tech Specs Re Fifth safety-related Battery & Battery Svc & Performance Testing,Including Revised LCOs

ML20077B850
Person / Time
Site:	Point Beach
Issue date:	05/10/1991
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20077B847	List: ML20077B845 ML20077B850
References
NUDOCS 9105150296
Download: ML20077B850 (15)

Text

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15.3.7 AUXILIARY ELECTRICAL SYSTEMS 6221icability Applies to the availability of off-site and on-site electrical power for plant power operation and for the operation of plant auxiliaries.

Ob.iective To define those conditions of electrical power availability necessary (1) to provide for safe reactor operation, and (2) to provide for the continuing availability of engineered safeguards.

Specification A.1 Under normal conditions neither 0,1e nor both reactors shall be made critical unless the following conditions are met:

a. At least two 345 KV travmission lines are in service. l

b. The 345/13.8 KV and the 13.8/4.16 KV station auxiliary transformers associated with the reactor (s) to be taken critical are in service; or one 345/13.8 KV station auxiliary transformer and the associated 13.8/4.15 KV station auxiliary transformer (s) are in service with the gas turbine operating,

c. 480 Volt buses 803 and B04 for the unit (s) to be taken critical are energized,

d. 4160 Volt buses A03, A04, A05, and A06 for the unit (s) to be taken critical are energized.

1. e. A fuel supply of 11,000 gallons is available; and both diesel gc generators are operable.

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All foue-batteMes nd thcir assoc 4eted4C-systems-eee-operabler Four of the five safety? elated station batteries and:allifo0r of the

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$'d mafi_n DC distribution 7sy.itsmsla'r e operable.

Four battery chargers are operable with one charger carrying the DC k 9 5 loads on each main DC ma+n distribution bus:'001, D02, D03 and;D04.

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on.a l Unit 1 - Amendment No. 47- 15.3.7-1 Mard 1, 1995

! Unit 2 - Amendment No. 97

4 e A.2 Under abnormal cond:' ions 4aelud4ag-Bleek-Mant-steetepr one reactor may be made critical providing the following conditions are met:

a. One 345 KV transmission line is in service; or the gas turbine is operating.

b. The 345/13.8 KV and the 13.8/4.16 KV station auxiliary transformers associated with the unit to be taken critical are in service; or the associated 13.8/4.16 KV station auxiliary transformer is in service and the gas turbine is operating.

c. Reactor power level is limited to 50% rated power until 2 or more transmission lines are restored to service,

d. 480 Volt buses B03 and B04 for the unit to be taken critical are energized.

e. 4160 Volt buses A03, A04, A05, and A06 for the unit to be taken critical are energized,

f. A fuel supply of 11,000 gallons is available; and both diesel generators are operable,

g. AIM +w-bat 4ee4es and-the4Nuec4eted-DG-+ystems - Orc operabler

g. Fourfor the five safety-related station- batteries and all four of

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the main DC distribution systems are operable.

h. Four battery chargers are operable with one charger carrying the DC loads of each inain DC main distribution bus; 001, 002, 003 and.D04.

B.1 During power operatic, of one or both reactors, the requirements of 15.3.7 A.1 may be modified to allow the following arrangements of systems and components:

a, if the 345 KV lines are reduced to only one, any operating reactor (s) must be promptly reduced to, and limited to, 50% power. If all 345 KV lines are lost, any operating reactor (s) will be reduced to supplying its auxiliary load, until one or more 345 KY transmission lines are again available,

b. If both 345/13.8 KV auxiliary transformers are out of service and l only the gas turbine is operating, only one reactor will remain i

operating and it will be limited to 50% power. The second rsactor will be placed in the hot shutdown condition.

Unit 1 - Amendment No. 15.3.7-2 Herch 1,1085-Unit 2 - Amendment No.-22_

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c. If the 13.8/4.16 KV auxiliary transformers are reduced to only one, -

the reactor associated with the out of service transformer must be placed in the hot shutdown condition,

d. Either bus A03 or A04 may be out of service for a period not exceeding 7 days provided both diesel generators are operable and the associated diesel generator is operating and providing power to the engineered safeguard bus normally supplied by'the out of service bus.

e. One diesel generator may be inoperable for a period not exceeding 7 days provided the other diesel generator is tested daily to ensure operability and the engineered safety features associated with this diesel generator shall be operable. '

f. One ef--the-batteric', DOS er DOS may be inoper:bic for -: period not ,

emeding 2' heur; prev 4ded-the-ethee-three-bat 4cric', nd-fw batteey-charger; re::in Operable-*4th ene chaegee-eeeey4ng the DG 4 cad; cf-eech-DC ::in distributten-bust 9 One of th- batteric; 0105 cr 0105 ::y be incperable--for : period not emed4ng=72 hove; predded-the-ethee-three-batteric; :nd four batteey-chaeger; re :in cper:ble-w+th one charger ::rrying the DG 4eads-ef-each DC ::in di',1+4but ten be;.

f. .  ; 0.ne of . the f6urfconnectedi s'a.fetyjrel at'ed ;~st'at10ni 6attefiesimayibe

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inoperableforlper;iod[notTexceedin[24;hoursiprovidedTfoustbattery

' hargersiremaWbpe'rable c withione"charg'eh carrying;:;the;DCiloadslof -

eachfmainTDCl distribution 600 Basis ,

This two unit plant has four 345 KV transmission line interconnections. A 20 MW '

gas turbine generator and two 2850 KW diesel generators are installed at the plant. All of these energy sources will be utilized to provide depth and reliability of service to the Engineered Safeguards equipment through redundant station auxiliary power supply systems.

The electrical system equipment is arranged so that no single contingency can L

I inactivate enough safeguards equipment to jeopardize the plant safety. The 480-volt equipment is arranged on 4 buses per unit. The 4160-volt equipment is i supplied from 6 buses per unit.

Two separate outside sources can serve either unit's low voltage station Unit 1 Amendment No.47- 15.3.7-3 fterch 1,1%5-Unit 2 - Amendment No. gr

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auxiliary transformer. One is a direct feed from the unit's high voltage station auxiliary transfor.aer w ' the ,cond is from the other unit's high voltage station auxiliary transformer or the gas turbine via the 13,800 volt system tie bus H01.

Separation is maintained in the 4160-volt system to allow the plant auxiliary equipment to be arranged electrically so that redundant items receive their power from the two different buses. For example, the safety injection pumps are supplied from the 4160 volt buses 1-A05 and 1-A06 for Unit No. I and 2-A05 and 2-A06 for Unit No. 2; the six service water pumps are arranged on 480-volt buses as follows: two on bus 1-B03, one on bus 1-B04, one on bus 2-B03 and two on bus 2-B04; the four containment fans are divided between 480-volt buses 1-803 and 1-804 for Unit No. I and 2-B03 and 2-B04 for Unit No. 2 and so forth. Redundant valves are supplied from motor control centers 1-B32 and 1-842 for Unit No. I and 2-B32 and 2-842 for Unit No. 2.

The-Point-Beach 4C-electe4+al-eyet+m-has4cen modif4ed-se-4 hat-each-of-the-foue 4 ns t+umen t-bu s-powe e-su pp44es4a s-4 t+-own4a t teey%nd-ba t4ecy-ch aegeer-One bat 4+ey-char 9ee-sha44-be-in-seev4ee-en--each-battery so- that-the4atterics wH4 alwa ys-be -e t-f e H-cha ege-4n-a nt4e4 pat 4en-o f-a-4 ess-o f-at-powee-int-ident . This 4nsures-that-adequate-de-power-w411 bc avaHeble-fee-st-aet4ng-the emergent-y 9enerators cad othee-emeegency =cs.

The Point Beach _ DC electrical _ system has' been modified so that- each' of the four main DC distribution; buses, which are' shared between the two units;.has'its own power sdpplies consisting of _a safety-related station battery (DOS, DOS, D0105, D0106) and a battery charger. In additionito these bus-specific power supplies, a swing safety-related battery (D0205) is^ installed which.is capabl6 of being connectedtofany;one.ofth'e'fourmainLDC. distribution' buses. Swing battery chargers are also provided. Under normal _ circumstances,'onel battery.;and one .

batterychargerareconnectedtoeachmain;DCLdistribution1 bus. The battery charger normally shal.1^ befin service 'on leach battery so thatLthe batteriesiwill always be at fu11Lcharge"inLanticipation of a' los's-of-AC power incideht .Under unusual circumstances, two' of'the' five~ safety-related batteries may. be out of service for a limited period of time provided one of the two.out-of-service batteriesisreturnedtoservicewithinithetimeperiodsspecifiedin Specification 15.3.7.B;1.f. These. limiting (.onditions for operation ensure that Unit 1 - Amendment No. 15.3.7-4 ~riarch i, 1985-Unit 2 - Amendment No. W

adequate DC power will always be available for starting the emergency gener:dars and other emergency uses.

The emergency generator sets are General Motors Corporation, Electro-Motive Division, Model 999-20 Units rated at 2850 KW continuous, 0.8 power factor 900 RPM, 4160 volts 3 phase, 60 cycle and consume 205 gallons of fuel per hour. Thus the 11,000 gallon supply in the Emergency fuel Tank provides sufficient fuel to operate one diesel at design load for more than 4E: hours. In addition, it will be normai for Point Beach to keep one, or the equivalent of one, bulk storage tank full at all times (55,000 gallons which is equal to about 10 days' supply).

They are each capable of providing 3050 kw for a 30 minute period, The gas turbine is capable of providing 20,000 kw.

If only one 345 KV transmission line is in service to the plant switchyard, a temporary loss of this line would result in a reactor trip (s) if the reactor (s) power level were greater than 50%. Therefore, in order to maintain continuity of service and the possibility of self sustaining operations, if only one 345 KV transmit ion line is in service to any operating reactor (s), the power level of the affected reactor (s) will be limited to 50%.

If both 345/13.8 KV station auxiliary transformers are out of service, only one reactor will be operated. The gas turbine will be supplying power to operate the safeguards auxiliaries of the operating reactor and acts as a backup supply for the unit's normal auxiliaries. Therefore, to prevent overloading the gas turbine in the event of a reactor trip, the maximum power level for the operating reactor will be limited to 50%. These conservative limits are set to improve transmission system reliability only and are not dictated by safety system requirements.

References FSAR Section 8.

Unit 1 - Amendment No.-97 15.3.7-5 -March 1,10SE-Unit 2 - Amendment No. -92

3. Each diesel generator shall be given an inspection, at least annually, following the manufacturer's recommendations for this class of stand-by service.

4. Each fuel oil transfer pump shall be run monthly.

The above tests will be considered satisfactory if all applicable equipment operates as designed.

B. Safety-Related Station Batteries The sel surie ill ance [speci fi c at i onsj are iappl i cabl s (to La.1_1 ; fosr [s a fe tjhrel a ted

'tationbatteriesfD05,fD06?;D105FendD106;andithesafety-relatsdstation s

1 swing. battery D205;

1. Every month the voltage of each cell (to the nearest 0.05 volt), the specific gravity and temperature of a pilot cell in each battery and  !

each battery voltage shall be measured and recorded.

2. Every 3 months the specific gravity, the height of electrolyte, and the amount of water added, for each cell, and the temperature of every fifth cell, shall be measured and recorded.

3. At each time data is recorded, new data shall be compared with old to detect signs of abuse or deterioration.

4. Ecch bettery shc11 bc ;ubjected to 01ccd-test-et-4*t+eva4+

eecc= ended by the m:wfecturcr but net-e* seed 4mf-f44e-yeaesr-The bat 4 cry vc149e-es-c functicn of time :hcIl be monitored-te est-abl4sh-that-the-eapaefty i: ;uff4efeet-to-carry the leads-es de+4eested in F6AR-Teble S.2 3 for ihe-:pec4f4ed-length cf- timm AH-elec4*icc1 connec-t4cn; will be cheeked-fee-t49hteess-4_ . . s E a chf. s a fe ty-rel a tedls t a t i on;;)a tteEyls h al ls be Ll demon s t r A te( OPERABL E i

'a . ; lAtJ1 east?on?eTper:18 month;si(SERVI?E$ TEST)) bj]veilf ling1that thelbatteylcapsttyfisiadesuite idisu;plffindLissintajnt:in OPERAB L Eist at ss Th1120_fithe [ acts al Jbrliiinul at ed[emefg encykl o ad s fsr'theldesign[dutficycle!*

b.  ;' At 11 e as tionceipe r[60 Tuon th s?( PERf0RMAN? E; T EST) lbfM e FLi fji ng th atithe i batte Fylcapac;1 ty j s.L a til e'a st:180Coff thsiminuf act6rer's rsting;TThis' perfoHnance dischargeltestiay bs performed firi

! 11eOfoffthe'batterytserviiteJest.*

c.  : AnnifaljTperformanc.el dischargeitestsj of; battery' capac t tyishall . be Unit 1 - Amendment No. H& 15.4.6-2 4emary-25r 4988-Unit 2 - Amendment No. 4H l t- J

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given to any battery that shows signs of degradation or has reached 85% of_ the 'serviceflife spected for the ap' plication.

Degradation is. indicated when the battery capacity drops more than10%ofrated;capacityJfrom;itspreviousperformance' test, or'is below 90% .off the manufactuper's rating.. When! performance 1

tests ~aFe requiredCthey' may be performed ~injlieu of the battery service' test".*

• Service and Performance testing' to'begin" subsequdnt tofinsta11ation of the swing safety-related battery (D0205) which is expected by;the'.end of;.1992.

Ei!111 The tests specified are designed to demonstrate that the diesel generators will provide power for operation of equipment. They also assure that the emergency generator system controls and the control systems for the safeguards equipment will function automatically in the event of a loss of all normal AC station service power.

The testing frequency specified will be often enough to identify and correct any mechanical or electrical deficiency before it can result in a system failure.

The fuel supply and starting circuits and controls are continuously monitored and any faults are alarm indicated. An abnormal condition in these systems would be signaled without having to place the diesel generators themselves on test.

Station batteries will deteriorate with time, but precipitous failure is extremely unlikely. The surveillance specified is that which has been demonstrated over the years to provide an indication of a cell becoming unserviceable long before it fails. If a battery cell has deteriorated or if a connection is loose, the voltage under load will drop excessively indicating replacement or maintenance.

A Service Test, performed at least every 18. months, demonstrates adequate battery

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capacity.to supply power to loads' required durtng the mo'st demanding ~dutylcycle.

This design. duty cycle occurs upon'an actuation of safeguards loadsTin'one" unit coincident with'a;1oss ofioff-site' power. .The ' design duty cycle isidefined further in FSAR, Section 8.2.

1 Unit 1 - Amendment No i n 15.4.6-3 Januar-y 25,-1988 Unit 2 - Amendment No. +1+

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A Performance Test- will also be conducted 'at least every; 60 months. The Performance Test is a_ constant? discharge' rate capacity test which allows comparison with the manufacture's rating;of the battery. This1 test. is the best  :

indicator of the effects if. aging lon? battery 'capacityi Provist_ons; are made. in

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these specifications to change"thej, test periodicity lto annual when thel battery is

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degradedorwhenthebatteryreacheslthatipointjinittsservice' life"at'which capacitidegradation; wit _htime"islaccel_erated.fOperabil.itjitssatisfactorily

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demonstrated; bi; achieving ~ a " capacity [offatileht' 80(oflthe manufactuper's

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rating. Since;.the Perfornance' Test boundsjthe batteril loads applied-;durin~gTa

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Service; Test, when a- Performance , Test is conducted, thel Servic'e Testifor that battery's current. test cycle mayibe omittsd.

TheseLsurveillance specifications-are applicable to all five of theLsafety-related station batteries: DOS,: DOS,;DIOS,;D106,:and_th_e_swingibattery 0205.

Reference FSAR, Section 8.2 k

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