ML18025B532

Proposed Tech Specs Re Auxiliary Electrical Sys

ML18025B532
Person / Time
Site:	Browns Ferry
Issue date:	06/08/1981
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18025B531	List: ML18025B530 ML18025B532
References
NUDOCS 8106110228
Download: ML18025B532 (27)

Text

INCLOSURE 2 PROPOSED TECHNICM SPK',IFICATION Eb.VISIONS BROWNS PERK NUCLEAR PLANT UNITS 1 AND 2 (TVA BFNP TS 156 SUPPLEMEDZ 1)

These revisions consist of the following:

P 1.

Removed reference to the start bus undervoltage relays which star t the diesel generators.

2.

Removed reference to the 0-l<'1 shutdown board overvoltage relays which start the diesel generators.

3.

Revised table 4.9.A.N.C to reflect new relay setpoints.

Auxiliary timer setpoints were added to table 4.9.A.A.C.

UNIT 1 PROPOSED TECHNICAL SPECIFICATEMS

LIHITING CONDITIONS F PERATION SURVEILLANCE QUIREHENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL S YSTEH b.

The units 1 and 2 4-kV shutdown boards are ener gized.

c.

The 480-V shutdown boards associated with the unit are energized.

d. The units 1 and 2 diesel auxiliary boards are energized.

I e.

Loss of voltage and degraded voltage relays operable on 4-kV shutdown boards A, B, C, and D.

f. Shutdown busses 1 and 2

energized.

g. The 480V Rx.

MOV Boards DAE are energized with M-G

,Sets IDN, IDA,, IEN, and IEA in service.

5. The 250-vo't unit and shutdown board batteries and a battery charger for each battery boards are operable.

6. Logic Systems a.

Common accident signal logic system; is operable-.

b. 480-V load shedding logic system is operable..

7. There shall, be a minimum of

'l03,300 gallons of diesel fuel in the standby diesel generator fuel tanks.

with instructions based on the manufactur er's recommendations.

e.

Once a month a sample of diesel fuel shall be checked for quality.

The quality shall be within acceptable limits specified in Table 1 of the latest revision to ASTH D975 and logged.

2.

D. C. Power System - Unit Batteries (250-Volt) Diesel Generator Batteries (125-Volt) and Shutdown Board Batteries (250-Volt) a.. Ever.y week the specific gravity and the voltage of the pilot cell, and temperature of an adJacent cell and overall battery voltage shall be measured and logged.

b. Every three months the measurement shall be made of voltage of each cell to nearest 0..1 volt, specific gravity of each cell, and temperature of. every fifth cell.

These measurements shall be logged.

c.

A battery rated discharge (capacity) test shall be performed and the voltage, time; and output current.

measurements shall be logged't intervals not to exceed'4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

293'

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'IMITIWG CONDITIONS FOR ERATION SURVEIL[ ANCE R.QUIRED fENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM

3. Logic Systems a ~ Both divisicns of the common accident signal lo'gic system shall be tested every 6 months to demonstrate that it will function on actuat'on of the core spray system of each reactor to provide an automatic stat t signal to all 4 units 1 and 2 diesel generators.

b.

Once every 6 months, the condition under which the 480-Volt load shedding logic system is required shall be simulated using pendant test switches and/or pushbutton test switches to demonstrate that the load shedd'ng logic system would initiate load shedding signals on the diesel auxiliary

boards, reactor HGV boards, and the 480-Volt shutdown boards.

4.

Under voltage Relays a ~ (deleted) b.

Once every 6 months, the conditions under which the loss of voltage and degraded voltage relays are required shall be simulated with an undervoltage on each shutdown board to 294'

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ZHITING CONDITIONS FOR OPE.ATION SURVEILLANCE REQU FHENTS 3.9 AUXILIARYELECTRICAL SYSTEH 4.9 AUXILIARYELECTRICAL SYSTEH demonstrate that the associated diesel generator will star t.

c ~ The loss of voltage and degraded voltage relays which start the diesel generators from the 4-kV shutdown boards shall be cali-brated annually for trip and reset and the measurements logged.

These relays snail be calibrated as specified Table 4.9.A.4.c.

d. 4-kV shutdown board voltages shall be recorded once every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

5. 480-V RHOV boards D and E

a.

Once per operating cycle the-automatic tr ansfer feature for 480-V RHOV boards D and E shall be functionally tested to verify auto-transfer capability.

294ai

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LIMITING CONDITIONS FOR OPE

~ION SVFJEILLANCF. PEG'!.i,

.'AGENTS 3 ~ 9 AUXILIARYELECTRICAL SYSTEM AUXILIAR'L'"CTRICAI SYSTEM any reason, continued reactor operation is permissible during the succeeding five days in accordance with 3.9.B.7

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9.

When one civision of the Logic System is inoperable, continued reactor operation is permissible under this condition for seven days, provided the CSCS requirements listed in specification 3.9.B.3 are satisfied.

The NRC shall be notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the situation, the precautions to "be taken during this per iod, and the plans to return the failed component to an operable state.

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(deleted) 11.

The following limiting conditions for. operation

'xists for the undervoltage relays which start the diesel generators on the 4-kY shutdown.boards.

a.,

The loss of voltage relay channel which. starts the diesel generator'or a,

complete loss, of voltage on

. a 4-kV shutdown board may be inoperable for 10 days pro-vided the degraded voltage relay channel on that shut-down board is operable (with in the surveillance schedule of 4.9.A.4.b.)

297

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3.9 AUX:fLZARYKLRCTRICAL SYPH!.""H StJRVFXL',4'iCt'.

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>l.9 AUXILIARYF.LZCl.'HT.CAL SYS L"t.l b,

The degraded vo3.tage relay channel which starts the diesel generator for degr d-ed voltage on a 4-kV shutdown board aay be inoperable for 10 days provided the loss of voltage relay channel on that shutdown board is 'operable (within the surveillance schedule of 4.9.A.4.b).

c.

One of the three phase-to-phase degraded vo3.tage relays provided to detect a degraded voltage on a 4-kV shutdown board may be inoperable for 15 days provided both of the following. conditions are satisfied.

1. The other'wo phase-to-phase degraded voltage relays on that 4-kV shut-down boa"d are oper"ble (within the surve'llance schedule of 4.9.A.4.b).

2.

The 3.oss of voltage relay channel on that shutdown board, is operable (within.

the surveillance schedule of" 4..9.A.4.b).

d.

The degraded voltage relay channel and the loss of'oltage relay channel on a 4-kV shutdown board may be inoperable for 5 days provid-ed the other shutdown boards and undervoltage relays are operable.

(Within the 297 ai

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Table 4.9.A.4.c VOLTAGE RELAY SETPOINTS/DIESEL GENERATOR START Rela Location Tri Level Settin Remarks 1.

4-kV Shutdown Boards Trip Setpoint:

Allowable Values Trip Range:

Reset Setpoint:

Allowable Values:

Reset Range:.

0 volts with a 1.5-second time delay

+.1 second 1.4 to 1.6 seconds 2870-V

+ 2% of 2870-V 2813-V to 2927-V Start diesel genera-tors on loss of off-site power.

2.

4-kV Shutdown Boards Trip Setpoint:

Allowable values:

Manufacturers guaranteed repeatability specification:

Reset Setpoint:

Allowable Values:

llndervolta e 3920 3900-3940 3920V + 1/2%

3955 3935-3995 Second level under-voltage sensing re-lays start diesel generator on degrad-ed voltage.

3.

4-kV Shutdown Boards (Timers shown for 4-kV shutdown board A.

4-kV shutdown boards B, C, and D, similiar, except for change of suffix)

Timer 2-211-lA 2-211-2A 2-211-3A 2-211-4A Setpoint (seconds) 0.27 + 5%

1.36 + 5%

7.43 + 5%

1.36 + 5%

Critical Time (seconds)

(0.3)

(1.5)

(8.2)

(1.5)

Auxiliary timers for second level under-voltage sensing relays.

The setpoint ranges specified assure that the operating times will be below the critical times speci-fied.

These ranges are based on timer repeatability of +'%

as specified by the manufacturer.

4 ')

RASCS Thc monthly tests of thc diesel generators are primarily to check for failures and deterforat!on fn the system since last use.

Thc diescls will hc Inadc<< to at least 75 percent, of rated power while engine and 8eneratcr tc< peratures arc stabilized (about onc hour).

The minimum 75 percent load vill prcvcnt soot formation in the cylfnders and in)ection nozzles.

Opera-tion up to an equi librium temperature ensures that there fs no overheat prob)cm.

The teats also provide an enefnc and 8enerator operatinp his ory to hc compared vith subsequent enp inc-pencrator teat data to 'den ify end to correct aiiy mcchanfcal or electrical deficiency before it can result'n a system failiirc.

The test <lurfng r fuelfnp o<itages f's morc co<.,prchensfvc, includfnq proce-dures that arc most ef fcctively condu" tcd at that t'imc.

These

<ncludc utnm~tfc actuat fon and functional capqbflfty tests to verify that the gcn< rotors c~n start and be ready to assume load in 10 seconds.

The ann<<al inspection vf 1 I detect any signa of wear lonp before faf1<<re.

i<at tery mnfntcnancr vltli regard to the floatfng charge

~ cqu'.1 fzfnp char" e, an<I el< ctrofytc level will bc based on thc manufacturer's instruction and snund mafntcnancc pr<<cticcs.

In addition, vrfttcn records vill be <<uin-taf<<e<! of the battery performance.

The plant bat tcrfcs vill deteriorate

<<it!i time but pr< cipLtous failure ia unlikely.

T)ic type of surveillance callrd for in this speci fication ia that which has been dcmonatratcd thrcuzh cxpcr!ence to provide an indication of a cell becoming Lrrcpular or unser-viccsb)c Loop before Lt becomes a'ailure.

Tiic equal fzinp cl<arpc, as rccommcndcd by thc manuf<<cturer, fa vital to mafn-tafnfnc t!ic Ampere-hour capacity of the battery, and vill be applied aa r ceo< v.".c:idcd.

The testing of the log<c sysiems vill verify ilia ability of the.'ogfc systc-s tn bring t!<c auxflfary e'lectr ical system to running standby readiness vfth t'.<<<presence of nn zccfdcnt s fgna) I rom any reactor or an undcrvolta<',c signal on thc 4-kV shutdown boards.

T i< periodic s!mulat ion of accident signals in con)unct!on with diesel "cne-ratnr voltage available signals vill conf Lrm the al fifty of the 480-volt load slicddlng logic system to. sequentially shed and res< art 480-volt loads Lf an acct<lent signal vere present and diesel generator voltage vere thc only source of electrical pover.

RF.F I";RE.'<CES l.

!<ormal Auxiliary Power System<

(BFHP FSAR subscccion 8.4) 2.

Standby A.C.

power Supply and Uistrfbutfon (BFqp FSAR subsection 3.5)

).

250-volt D.C ~

Power Supply and OLstribution (BFHP FSAR subsection 6.6) 301

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UNIT 2 PROPOSED TKBNICAG SPK!IFICATIONS

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" 'LIMITING CONDITIONS FOR OP ZION 3.9 AUXILIARYELECTRICAL SYST"":M 4.9 AU:(I: IARY ELECTRICAL SYSTEM S;."'.EILLANCE REQL..r.bSNTS b.

The units 1 and 2 4-kV shutdown boards ar.

energized.

c. The 480-V shutdo'.""~ boards associated with the unit are energized.

d. The units 1

and 2 diesel auxiliary boar'l a: e energized.

with instructions based on the manufacturer's recommendations.

Once a month a sample of

'diesel fuel shall be checked for quality.

The quality shall be within acceptable limits specified in Table 1 of the latest revision to ASTM D975 and logged Loss of voltage and degraded voltage relays operable on 4-kV shutdown boards.

A, B, and D.

2.

D. C. Power System Unit Batteries (250-Volt) Diesel Generator Batteries (125-Volt) and Shutdown Board Batteries (250-Volt)

f. Shutdown busses 1 and 2

energized..

5. The 250-volt unit and shutdown board batteries and a battery charger for each battery boards are operable.

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6. Logic Systems a.

Common accident signal logic system is operable.

b. 480-V load shedding logic system is operable.

7'. There shall. be a; minimum of 103,300 gallons of diesel fuel in the standby diesel generator fuel tanks.

a ~

b.

C ~

Every week the specific gravity and the voltage of the pilot cell, and temperature of an ad)ac nt cell and overall battery voltage shall be measur ed and logged.

Fvery three months the measurements shall be made of voltage of each cell to nearest 0.1 volt, specific gravity of each cell, and temperature of every fifth cell.

These measurements shall be logged.

A battery rated discharge (capacity) test shall be performed and the voltage,

time, and output current measurements.

shall. be logged at intervals not to exc ed 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> s..

293a~

.(.THIT'.fC CG>JDITIOMS YOP 0 TI"H SURVEILLPnCH RE El~~aViSi' 3.9 AUXILIARYELECTRiCAL SYSTEH

<l.9 AUXILIARYELECTRICAL SYSTEM

3. Logic Systems a ~ Both divisions of'he common accident signal logio system hall be tested every 6 months to demonstrate that it will function on actuation oi the core spray system of'ach reactor to provide an automat'c tart signal to all 0 units,1 and 2 diesel generators.

b.

Once every 6 months, the condition under which the 480-Volt load shedding logic system is required shall be simulated using pendant test switches andlor pusnbutton test switches to demonstrate that the load sheddirg logic system would initiate

'oad shedding signals on the diesel auxiliary

boards, reactor HOV boards, and the 480-Volt hutdo'.m boards.

0. Undervoltage Relays Q ~

(deleted) b.

Once avery 6 months, the.

conditions under which. the.

loss of voltage and d graded.

voltage relays are required shall be simulated with an undervoltage on each shutdown board to 290.

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~ 'l'IMITING COIIDITIOffS FOB OfTION

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3.9 AUXILIARYELECTRICAL SYSTEH SURVEILLANCE REQ EHEHTS 4 '

AUXILIARYELECTRICAL SYSTEYI demonstrate that the associated diesel generator will start.

c ~ The loss of voltage and de-graded voltage relays which start the diesel generators from the 4-kV shutdown boards shall be calibrated annually for trip and reset and the measurements logged.

These relays shall ba.calibrated as specified in Table 4,9.A.4.c.

d 4 k7 shutdown board voltages shall be recorded once every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

294'a>

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, LIHITIJJG COJJDTTIO' R

TIOJJ SURVPILLA?.CE RE

.EHENTS 3.9 hOXILIARY ELECTRICAL SYSTEH

'J.9 AUXILIARY"LECTRICAL SYSTEH any rea on, continued reactor operation is permissible durirg the succeedir~ five days in accordance with 3.9.8.7.

9.

Mhen one division of'he Logic System is inoperable, continued reactor operation is permissible urdar this condition for seven days, provided the CSCS requirements listed in specification 3.9.B.3 are satisfied.

The JJRC shall bo notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the situation, the precautions to be taken during this period, and the plans to return the failed component to an oporablo 3 tate

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10. (deleted)

The following limiting condi-'ions for operation exis'ts for the undervoltage relays which start the diesel generators on the 4-kV shutdown boards.

a.

The loss of voltage relay channel which starts the diesel generator for a com-plete loss: of voltage on a 4-kU shutdown board may be inoperable for 10 days pro-vided, the degraded voltage relay channel on

, LIMITIVG CONDITIONS VO3 SURVEILLANCE FH FONTS

'.9 AUXILIARY LECTRICAL rSTEM 4.9 AUXILIARYELECTRICAL SYS EM that shutdown board is oper-able (within the surveillance schedule of 4.9.A.4.b),

b. The degraded voltage relay channel which.,tarts the diesel generator for degrad-ed voltage on a 4-.kV shut-down board may be inoperable for 10 days provided the los..

of voltage relay channel on that shutdown board is oper-able (within the surveillanc schedule of 4.9.A.4.b).

c.

One of the three phase-to-phase degraded voltage relays provided to detect a degraded voltage on a. 4-kV shutdown board may be inoperable for 15 days provided both of the followin" conditi'ons are satisfied.

1.

The other two phase-to-phase degraded voltage relays on that 4-kV shut-down board are operable (within the surveillance schedule of 4.9.A.4.b),

4

2. The loss of voltage relay channel on that shutdown board is. operable (within the-surveillance. schedule of. 4..9.A.4.b).

The degraded voltage relay channel and the loss of voltage relay channel. on a 4-kV shutdown board may be inoperablc for 5 days pro-vided the other

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Table 4.9.A.4.c VOLTAGE RELY SETPOINTS/DIESEL GEHERATOR START Rela Location Tri Level Settin Remarks l.

4-kV Shutdown Boards Trip Setpoint:

Allowable Values Trip Range:

Reset Setpoint:

Allowable Values:

Reset Range:

0 volts with a 1.5-second time

.delay

-= +.1 second 1.4 to 1.6 seconds 2870-V

+ 2% of 2870-V 2813-V to 2927-V Start diesel genera-tors on loss of off-site power.

2.

4-kV Shutdown Boards Trip Setpoint:

Allowable Values:

Manufacturers guaranteed repeatability specification:

Reset Setpoint:

Allowable Values:

Undervolta e

3920 3900-3940 3920V + 1/2%

3955 3935-3995 Second leve1 under-voltage sensing re-lays start, diesel generator on de rad-ed voltage.

3.

4-kV Shutdown Boards (Timers shown for 4-kV shutdown board A.

4-kV shutdown boards B,

C, and D, similiar, except for change of suffix)

Timer 2-211-lA 2-211-2A 2-211-3A 2-211-4A Setpoint (seconds) 0.27 + 5%

1.36 + 5%

7.43 + 5%

1.36 + 5%

Critical Time (seconds)

'0.3)

(1.5)

(8.2)

(1.5)

Auxiliary timers for second level under-voltage sensing relays.

The setpoint ranges specified assure that the operating times will be below the critical times speci-fied.

These ranges are based on timer repeatability of + 5%

as specified by the manufacturer.

+v C ~

P.

4,9 BASES The monthly tests of the diesel generators aze primarily to check for failures and deterioration in the system since last use.

The diesela will be loaded to at least 75 percent of rated power while engine and generator temperatures are stabilized (about one hour).

The minimum 75 percent load will prevent soot formation in the cylinders and infection nozzles.

Operat'on up to an eauili? rium temperature ensures that there is no overheat problem.

The test also pzovides an engine and gener..tor operating history to be compared with subsequent engine-generator test data to identify and to correct any mechanical or electrical deficiency before it can result in a system failure.

The test during refueling outages is more comprehensive, including procedures that are most effectively conduc'.ed at tha" tine.

These include automatic actuation and functional capability tests to verify that the generator..

can start and be ready to assume load in 10 seconds.

The annual inspection will detect any signs of wear long before failure.

Th'e diesel generators are sharea by units 1 and 2.

Therefore,'he capability for the units 1 and 2 diesel generators to accept the emergency loads will be performed during the unit 1 opexating cycle using the unit 1, loads.

Battery maintenance with regard to the floating cliarge, equalizing charge,,

and electrolyte level will be based on the manufacturer's instruction and sound maintenance. practices.

In addition, written records will be maintained of t?ie battery performance.

The plant batteries will deteziorate with time but precipitous failure is unlikely.

The type of surveillance called for in this specification is that which has been demonstrated through experience to provide an indication of a cell becoming irregular or unserviceable long before it becomes a failure.

The equalizing charge, as recommended by the manufacturer, is vital to maintaining the Ampere-hour capacity of the battery, and vill be applied as recommended.

The testing of the logic systems will verify the ability of the logic systems, to bring the auxiliary electrical system to running standby readiness with the presence of an accident signal frcm any reactor or an. undervoltage signal on the 4-kV shutdown boards.

The periodic simulation of'ccident signals in con]unction with diesel generator voltage available signals will confirm the ability of the 480-volt load shedding logic system to sequentially shed and restart 480-volt loads if an accident signal were present and diesel generator voltage were the only source of electrical power.

REFERENCES 1..

Normal Auxiliary Power System (BFHP FSAR subsection 8.4) 2'tandby A., C.. Power. Supply and Distribution (BFNP FSAR subsection 8.,5) 3'50-volt D.

C'. Power Supply'nd. Distribution (BFNP FSAR'ubsection 8.6 30 1'.

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