Text

Proposed Tech Specs 3/4.8.2 Re D.C. Sources
	ML20137S534
Person / Time
Site:	Byron
Issue date:	04/07/1997
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML20137S531	List: ML20137S524; ML20137S534;
References
	NUDOCS 9704150163
	Download: ML20137S534 (30)
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, ELFCTRICAL POWER SYSTEMS -

3/4.8.2 D.C. SOURCES OPERATING '

LIMITING CONDITION FOR OPERATION '

3.8.2.1 As a minimum the following D.C. electrical sources shall be OPERABLE:

a. 125-Volt D.C. Bus 111 fed from Battery 111 for Unit 1 (Bus 211 fed from Battery 211 for Unit 2 and its associated full capacity char t one of its associated c)rosstie breakers in the open position,ger, and and with

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b. 125-V61t D.C. Bus 112 fed from Battery 112 for Unit 1 (Bus 212 fed fron Battery 212 for Unit 2) and its associated full capacity charger, and Qith .1 one of its associated crosstie breakers in the open position. :

T l APPL 1pABILITY: MODES 1, 2, 3, and 4. t t

EllQti:

a. With one of the required 125-Volt D.C. buses inoperable due to its normal associated full capacity charger being inoperable opera M as may continue I provided that within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months the inoperable bus an,d its associated battery are energized by the opposite unit's 125-Volt D.C. bus and its OPERABLE charger via the crosstie breakers and that within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months the inoperable bus and its charger are restored to OPERABLE status. Otherwise be in at least HOT30 following STANDBY hours. within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and COLD SHUTDOWN within the b.

With re both of the crosstie breakers closed for a 125-Volt D.C. bus that is 3

4) quired to be OPERABLE and with both units operating JModes 1, 2, 3, or VoltD.C.bushavinganinoperablechargerwithoutaloadrestriction.the 125-Volt /

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c.

With both required to of bethe crosstie breakers OPERABLE closed and with the for aunit opposite 125-Volt D.C. bus that is shutdown or defueled), the crosstie breakers may remain closed for up(Modes 5, 6, to 7 days provided items I and 2 below are satisfied. Otherwise open one of the crosstie breakers.

g (1) The shutdown unit's bus load is restricted to:

Shutdown Unit )r Operating Unit Load i

< Batterv 5111g1 Battery voe Restriction Inoperable -AW Carb too 499 Amps J l Inoperable Gould 63 Am [

OPERABLE Either None ps j 4

(2) If a load restriction applies then once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months verify that the \

shutdown unit's bus loading wlli not exceed the load restriction.

d. /

With one of the required 125-Volt D.C. buses inoperable, except for the allowances of ACTIONS (a b or f J

to OPERABLE status within),2(ho)u,rs or(c) above, restore the inoperable bus be in at least HOT STANDBY within the i next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . 4 SURVEILLANCE RE0VIREMENTS 4.B.2.1.1 Each D.C. bus shall be determined OPERABLE and energized from its battery at least once per 7 days by verifying correct breaker alignment.

9704150163 970407 PDR ADOCK 05000454 p PDR BYRON - UNITS 1 & 2 3/4 8-10 AMENDMENTNO.p

l tLECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 4.8.2.1.2 Each 125-volt battery bank and its associated charger shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that: I

1) The parameters in Table 4.8-2 meet the Category A limits, and

- 2) The total battery teminal voltage is greater than or equal to 149d volts (AMT) 126 volts (Gould) on float charge, f 12.7. I, j Ece

b. At least once per 92 days and within 7 days after a battery discharge with battery terminal voltage below 110 volts, or battery overcharge with battery terminal voltage above 145 volts, by verifying that:

1) The parameters in Table 4.8-2 meet the Category B limits,

2) There is no visible corrosion at either terminals or connectors, or the copnection resistance of these items is less than 150 x 10' ohe*, and

3)' The average electrolyte temperature of all ' connected cells is above 60*F.

c. At least once per 18 months by verifying that: _

1) and battery racks show no visual The cells,of indication cell physicalplates, damage or abnomal deterioration,

2) The cell-to-cell and terminal connections are clean, tight, and coated with anticorrosion material,

3) The resistance of each cell-to-pell and terminal connection is less than or equal to 150 x 10' ohe*, and

4) The battery charger will supply a load equal to the manufacturer's rating for at least 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

d. by verifying that the I

At leastcapacity battery once per 18 months, is adequate during to supply shutdown,intain and ma in OPERABLE i i

status all of the actual or simulated emergency loads for the design duty cycle when the battery is subject to a battery service test; i l

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0btained by subtracting the normg1 resistance of: 1 the cross room rack 4 connector and )21 the bi-level rack connector ( M . ATei ..e 400 L.li --50 x 10'x 10Loiu ..1,+---

ohe, tzpical)typica9);

ohn, from the measurad ce'll-to-cell connection resistance.

BYRON - UNITS 1 & 2 3/4 8-11 AMENDMENTNO.M

' ELECTRICAL POWER SYSTEMS SURVEILLANCE REDUIREMENTS (Continued)

e. At least once per 60 months d skutdown, b battery capacity is at leasi ~uring'??)- 5 :, 805 _id of the manufacturer'sratingwhensub3ectedtoaper(0:yverifyingth or a modified performance discharge test. The modified performance dischargetestjkTi!)andtheperformancedischargetest(Gould)may ou pen- in lieu of the battery service test required by

. (C&b)J Specification 4.8.2.1.2d.; ,

f. by giving performance At least once discharge tests or per 18 months modified during performance disc shutdown,harge tests of battery capacity to any battery that shows signs of degradation or has reached 855 of the service life expected for the application.

Degradation

^ is indicated when the battery capacity drops more than-51P

-(..iT,' 105_(Errid) of rated capacity from its capacity on the g"reviousgerformancetestormodifiedperformancetest,orisbelow

' ("Tt.) 905 (trr?dy of the manufacturer's rating.

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BYRON - UNITS 1 & 2 3/4 6-11a AMENDMENT NO. f!I

TABLE 4.8-2 (AT&T)

BATTERY SURVEILLANCE REDUIREMENTS CATEGORY A") CATEGORY Bc2)

PA ETER LIMITS FOR EACH LIMITS FOR EACH ALLOWABLEcs>

DESIGNATED PILOT CONNECTED CELL VALUE FOR EACH CELL CONNECTED CELL Electrol e > Minimum level > Minimum level Above top of Level- -

indication mark indication mar , plates, and 5 4" above , and s 4" abov and not l maximum level" maximum lov overflowing '

indication mark indication rk Float Voltage 2.18 volts 2 2.18 l t s > 2.14 volts Not more 1.han 0.020 below the average of all connected specifig Gravity ) 1.280 cells l i

2 1.285"' i '

Average of all Average of all connected cells connected cells

> 1.290 2 1.2800) l TABLE NO TIONS ;

(1) For any Category A par ter s outsid may be considered OPE LE pr(ov)ided thawithin24hoursallthe the limit (s) shown the battery Categor values,y 8 seasuremen and are taken and fo d to be within their allowable provided 11 Category A and B within limits withi the next 6 days raceter(s) are restored to (2) outsidethe For be may anyconsidered Category B'ERABLE >arameter(s)ided prov th n the mit(s) tegory shown, theare 8 parameters battery within their all able values and provided the tegory B parameter (s) are restored to wit n limits within 7 days. ,

(3) Any Category B arameter not within its allowable alue indicates an inoperable bat ery.

Corrected for electrolyte temperature and level.

Or battery c arging current is less than 2 amps when charge.

Corrected f average electrolyte temperature.

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l BYRON - UNITS 1 & 2 3/4 8-12 AMENDMENT NO 59

.. . - - . _ _ . - . - . - . - - _ ~ . . . - . . - - . . . - . - - . _ . - - - . _ _

TABL E 4.8-2 (S^"' '"f !

l BATTERY SURVD LLANCE REQUIREMENTS !

l CATEGORY A"3 CATEGORY Bra)

! PARAMETER LIMITS FOR EACH l

LIMITS FOR EACH ALLOWABLE (38 DESIGNATED PILOT CONNECTED CELL VALUE FOR EACH

! CELL j CONNECTED CELL t .

Electrolyte > Minimum level > Minimum level Above top of i

Level indication mark indication mark plates

'- and s 6' above , and s n' above , andnof.

maximum level l

maximum level overflowing indication mark indication mark 3 Float Voltage 1 2.13 volts 1 2.13 volts > 2.07 volts l

l

' Not more'than O.020 below the average of all connected Specifig3 1 1.195 cells Gravity i

1 1.200)

l Average of'all Average of all s

connected cells connected

. cells i

> 1.205. ,

2 1.195(5)

TABLE NOTATlgl[1 -

(1) For any Category A parameter s outside the limit (s) shown l

maybeconsideredOPERABLEpr(ov)idedthatwithin24hoursallthethe battery Category B measurements are taken and found to be within their allowable values, and provided all Category A and B parameter (s) are restored to within limits within the next 6 days.

(2) For any Category B parameter s may be considered OPERABLE pr(ov)ided that the Category B parameters areout within their allowable values and provided the Category B parameter (s) are restored to within limits within 7 days.

(3) Any Cate B parameter not within its allowable value indicates an inoperab attery. )

p Corrected for electroly o temperature and level # '

)

Or battery charging curtent is less than 2 amp when on charge.

,) Corrected for average electrolyte temperature. !

QWA) 3 amps (C&D)'

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% G.a.c.auw W eled<ot k ke@

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l BYRON - UNITS 1 & 2 3/48-12h AMENDMENT NO. h i

ElFCTRICAL p0WER SYSTEMS D.C. SOURCES SHUTDolmi LIMITING CONDITION FOR OPERATION 3.8.2.2 As a minimum one 125-volt D.C. bus fed from its battery and its

. associated full-capacity charger and with one of its associated crosstie breakers in the open position shall be OPERA 2.5. -

APPLICABILITY: MODES 5 and 6.

s.

EIlgt:

a. '

With both of the crosstie breakers closed for the 125-Volt D.C. bus that '

is required to be OPERABLE and with the opposite unit operating (Modes 1, ' '

2 3 or4p,theshutdownunit's rable 125-Volt D.C. bus may energize l tho,perattngunit'sinoperable1g2..VeltD.C.bushavinganinoperable charger without a load restriction. i l

b.

With both of the crosstie breakers closed fcr the 125-Volt D.C. bus that is required to be OPERABLE and with both units shutdoun (Modes 5, 6 or defueled D.C. bus)forupto7daysprovideditemsJand2belouaresatisfied.the 125-Volt D.C Otherwise open one of the crosstie breakers.

(1) The opoosite unit's bus load is restricted to: -

{

, sitentatus op$erv aus Operable Bus Load na matterv Tvne Restriction Inoperab'e *Gould ttf- c e zoo 4ee Amps (

Inoperable 63 Amps OPERABLE Either None t

(2) If a load restriction applies then once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months verify that the oppositeshutdoununit'sbusinadingwillnotexceedtheload restriction.

c. With the required 125-Volt D.C. bus inoperable, except for the allowances of ACTIONS a) or b above immediately suspend all operations involving CORE ALTERA" IONS, p(os)itive r,eactivity additions, or movement of irrad fuel; initiate corrective action to restore the required bus to OPERABLE L status as soon as possible and within R hours Reactor Coolant Systes thro; ugh at least a 2 squ,are inch vent.depressurize and vent thei j SURVEILLANCE REQUIREMENTS J i

4.8.2.2 The above re j associated and char 4.8.2.1.2. ger sh!utred 125-volt D.C. bus fed from its battery and its11 i

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4 BYRON - UNITS 1 & 2 3/4 8-13 AMENDMENT NO. d

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ELFCTRIC POWER SYSTEMS nASEE l

A.'t.

crunorES. D.C. etwrs. AND GN1fTE POWER DISTRIR1TTION (Continued) {

i i The Surveillance Requirement for demonstrating the OPERABILITY of the d station batteries is based on the recommendations of Regulatory Guide 1.12g, i " Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Practice forPower Maintenance Plants," an and IEEE February Testing Std 450-1980 Ig78,d "IEEE Recommended Replacement of Large, Lead s!

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Batteries for Generating, Stations,and substations."

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- The modified Mt5;hi=teNEEStd4 rfo is test is described in t; M '1 24 1:";; I

{

a "I RecommendedPracticeforMaiIitenance,, I and Re i Testing, Applicat ions." placement of V ted Lead-Acid Batteries for Stationary 4

test on the Itbatte is pemissible to perform a modified perfomance discharge i l test as reout in lieu of a service test and a perfomance discharge )

latory Guide 1.12g, Resulatory Position C.1 )

j the test discha velopes the load cycle of the service tesi.because l i l Verification o crosstie loading limits in Specifications 3.8.2.1.and !

3.8.2.2 ensures that the OPERABLE battery will have sufficient capacity to (

energize the design basis leads of its DC. bus while maintaining the limited DC l loads of the inoperable DC bus on a shutdown unit. l battery Verifyino average electrolyte temperature above the minimum for which the was sized k total battery terminal voltage on float charge and the 1

perfomance of baltery service and discharge tests ensures the effectiveness of the charging system the ability to handle high dischar the battery capacity al that time with the rated capacity.ge rates and compares i '

i The battery service test is a special test of battery as-found, to satisfy the design reouirements (battery electrical power system. The discharge rate and~1 cyc ability,D.C.

of the

)

of battery service (

test corresponds to the design duty cycle requiremen s as specified in UFSAR t

subsection 8.3.2.1.1. .

(

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- Table 4.8-2 specifies the normal limits for each designated pilot cell 1 and each gravity. The connected cell for electrolyte level, float voltage and specific l gravity greatar limits for the designated oilot cells float voltage and specific than MS nit i JC 1.13 volts '!::1 and 0.015 below the manufaclurer's full charge spec;ifI;c gra}vity or a baltery@ charger current that i had stabilized at a low value is characteristic of a charged cell with

adequate and capacity.

specific gravity The nomai limits for each connected cell for float voltage !

i i more than 0.020 below, creater than 2.n mu. '007 2.13the manufacturer's full ch corage specific 1 i the manufacturer' gravity of all the connected cells not more than 0.010 below

s full charge specific gravity, ensures the OPERABILITY and capability of the battery.

3 Operation with a battery cell's parameter outside the normal limit but

within 7 days.the allowable During valueperiod:

this 7-day specified in Table 4.8-2 is permitted for up to (1 the allowable values for electrolyte level ensures no physical damane to the) plates with an adequate electron of transfer cells no 2 the allowable all the capability;t(mo)re thanvalue 0.020for the average specific gravity below the manufacturer's recommen '

f charge specific g,ravity, ensures that the decrease in rating will be less than the safety cell's specific margin provided gravity, ensures tha inn sizingtthe allowable a(3) value for an individual individual cell's specific grav

will not be more than 0.040 below the manufacturer's full charge specific gravity and that the overall capability of the battery will be maintained the allowable value for an individual within anvoltage, acceptable greaterlimit; than and (4)32 =1t; '00? 2.07 volts (can19, cell's float

] ensures the battery s capability to perform its des < gn function.

l BYRON - UNITS 1 & 2

.. 1 B 3/4 8-2 AMENDMENT N0. % . _ .

l ATTACHMENT B-2 l l

MARKED UP PAGES FOR

- PROPOSED CHANGES TO DRAFT IMPROVED TECHNICAL SPECIFICATIONS I I

REVISED PAGES.

3.8-20 3.8-21 3.8-22 l 3.8-25 3.8-27 ,

3.8-28 B3.8-48 B3.8-49 B3.8-5 ;

B3.8-56 ,

B3.8-57 '

B3.8-58 B3.8-63 B3.8-68 B3.8-70 I B3.8-72

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t DC Sources-Operating 3.8.4 l 1 I

ACTIONS (continued) l CONDITION REQUIRED ACTION COMPLETION TIME l

1 i C. One DC electrical C.1 ---------NOTE-------- !

! power. division Only required when j l crosstied to opposite unit has an ;

! opposite-unit DC inoperable battery.

j ,

electrical power ---------------------

i -subsystem with an l inoperable source. Verify opposite-unit Once per ,

l while opposite unit is DC bus load s 63 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months

in MODE 5. 6. or amps s (s,.au .e( zoo-l defueled. .. p3 (c sg),

i MD

! C.2 Open at least one 7 days crosstie breaker .

between the crosstied divisions. ,

l D. OneLDC electrical D.1 Restore DC electrical 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months '

power subsystem power subsystem to inoperable for reasons OPERABLE status, other than Condition ;

I

! A. B. or C.

1 i .

E. Required Action and E.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ;

Associated Completion-Time not met. AND l E.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months l

l i

BYRON - UNITS 1 & 2 3.8-20 Revision A l l

DC Sources-Operating 3.8.4 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY l SR 3.8.4.1 Verify battery terminal voltage is a 126 V, 31 days on float charge. g,g ,, ,,, gg y SR 3.8.4.2 Verify each battery charger supplies a load 18 months equal to the manufacturer's rating for

= 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

l SR 3.8.4.3 NOTES

1. The performance discharge testdin SR 3.8.4.4 may be performed in lieu of l the service test in SR 3.8.4.3.

. 2. This Surveillance shall not be l performed in MODE 1. 2. 3. or 4.

l l Verify battery capacity is adequate to ;

! supply, and maintain OPERABLE status, the 18 months

! required emergency loads for the design duty cycle when subjected to a battery service test.

) (continued)

(6,A&) or St me6 Wad PE8"""t' olinko.r$t 4est ( d DJ l

l BYRON - UNITS 1 & 2 3.8-21 Revision A l'

DC Sources-Operating ;

3.8.4 1 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.4 NOTE l This Surveillance shall not be performed in :

MODE 1, 2. 3. or 4.

Verify battery capacity is = 80% of the 60 months manufacturer's rating when subjected to a performance discharge tests (6.v14) er 6 AND ,

g,Ag;g 7vform%u dis 4vy bst U40).'

8mh [

battery shows degradation or '

I has reached 85%

of expected '

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BYRON - UNITS 1 & 2 3.8-22 Revision A l

l DC Sources-Shutdown 3.8.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME B. One DC electrical B.1 ---------NOTE--------

power division Only required when crosstied to opposite unit has an opposite-unit DC inoperable battery. !

electrical power ---------------------

I subsystem with an .

inoperable source. Verify opposite-unit Once per while opposite unit is DC bus load is 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months in MODE 5. 6. or s 63 ampss y,,,aa).c defueled. s too . ,, c c a),

A!iQ .

B.2 Open at least one 7 days crosstie breaker between the crossticd divisions. ,

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! SURVEILLANCE RE0UIREMENTS SURVEILLANCE FREQUENCY l SR 3.8.5.1

NOTE--------------------

The following SRs are not required to be performed: SR 3.8.4.2. SR 3.8.4.3. and :

l SR 3.8.4.4.

I

! For DC sources required to be OPERABLE. the In accordance following SRs are applicable: with applicable l SRs SR 3.8.4.1 SR 3.8.4.3 l SR 3.8.4.2 SR 3.8.4.4.

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. i BYRON - UNITS 1 & 2 3.8-25 Revision A 1

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_ . _ _ _ _ . . . _ _ _ _ _ _ _l Battery Parameters, 3.8.6 ACTIONS ,

CONDITION REQUIRED ACTION COMPLETION TIME j l

A. (continued) A.2.1 Perform SR 3.8.6.2. 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months SR 3.8.6.5, and !

SR 3.8.6.6. MQ !

i Once per 7 days thereafter 1 08 !

A.2.2 Perform SR 3.8.6.5, 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months s-SR 3.8.6.6. -

SR 3.8.6.7, and AND SR 3.8.6.8. i Once per 7 days. i thereafter i

AND ;

A.3 Restore battery 31 days :

[ parameters to within limits of the Battery Inspection Program. )

B. One battery with B.1 Restore battery float - 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months required: float current current.to < 2 ampss

=2ampg,but<10 (g,g) 3,,y (cn),

amps ir (continued)

( k ia) 3 a m ps i L( t&D) s l

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l l . BYRON - UNITS 1 & 2 3.8-27 Revision A l

Battery Parameters 3.8.6 ACTIONS- (continued)

CONDITION REQUIRED ACTION. COMPLETION TIME l

C. Required Action and C.1 Declare associated Immediately associated Completion battery inoperable.

l Time of Condition A.or B not met.

E I One or more batteries

, with one or more battery parameters not within limits for i reasons other than i~

Condition A or B. i i

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(' 8 l SURVEILLANCE REQUIREMENTS ,

SURVEILLANCE FREQUENCY l SR 3.8.6.1 Verify battery parameters are within In accordance Battery Inspection Program limits, with the Battery Inspection Program i

SR. 3.8.6.2 NOTE Not required to be met if SR 3.8.6.3 SR 3.8.6.7. and SR 3.8.6.8 are met.

l Verify battery float current is < 2 amps on 31 days I l

float charge. l 3 eps (C&D)) (continued)

L BYRON - UNITS 1 & 2 3.8-28 Revision A l

l DC Sources-Operating B 3.8.4 ,

BASES l BACKGROUND The Division 11 (21) and Division 12 (22) DC electrical l (continued) power subsystems provide the control power for its l associated Class 1E AC power load group. 4.16 kV switchgear, and 480 V load centers. The DC electrical power subsystems also provide DC electrical power to the inverters, which in

, turn power the AC instrument buses. Additionally, the Class 1E 125 VDC electrical power subsystems )rovide power to the 6.9 kV Reactor Coolant Pump (RCP) breacers and the non-Class 1E 125 VDC buses. The connection between the i- Class 1E and non-Class 1E 125 VDC buses contains fuses to l ensure that a fault on the non-Class 1E bus does not cause a loss of the Class 1E bus.

The DC power distribution system is described in more detail in Bases for LCO 3.8.9. " Distribution System-Operating."

l and LC0 3.8.10. " Distribution Systems-Shutdown " j i

Each battery was sized based upon supplying the design duty l cycle in the event of a loss of offsite AC power concurrent

- with a Loss Of Coolant Accident (LOCA) and a single failure of a Diesel Generator (DG). Each Gould battery has a-gu;r r.tccd nominal rating of 1200 ampere-hours. ,;-d .;;: sized based unon continuously carrying the various estimated Go'3 90 ads. Thelbatteries were sized i accordance with

! IEEE-485-1978 (Ref. 5). m ce 1,aSkrN m sged u meda u ,

l ,o% IEEE -05'- nu (.Rd it). ,

Each 125 VDC battery is separately housed in a ventilated room apart from its charger and distribution centers. Each

, subsystem is located in an area separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem. There is no sharing between l redundant Class IE subsystems such as batteries battery l chargers or distribution panels. While it is possible to l

interconnect the Unit 1 and Unit 2 DC electrical power subsystems, they normally remain disconnected, except when a DC source must be taken out of service for the purposes of maintenance and/or testing or in the event of a failure of l a DC source.

ck C lj) In b 7h e """ ?, '

ce

" E d b 1-Lwr ro.k b ** * # y

9. ~ ~ , - -

(continued)

BYRON - UNITS 1 & 2 B 3.8-48 Revision A

i DC Sources-Operating B 3-.B.4 BASES I

i BACKGROUND The crosstie between 125 VDC ESF buses 111 and 211 and the l

(continued) crosstie between 125 VDC ESF buses 112 and 212 are each provided with two normally locked open, manually operated I

circuit breakers. No interlocks are provided since the interconnected buses are not redundant. However, if one .

battery is inoperable, procedural and administrative controls are used to limit the connected load tc $3 =p based on not exceeding the OPERABLE battery capacity. These controls ensure.that combinations of maintenance'and tesc ;

operations will not preclude the system capabilities to i supply power to the ESF DC loads. The provisions of administratively controlled, manually actuated. .

interconnections between the non-redundant Class 1E DC buses increases the overall reliability and availability of the'DC systems for each unit in that it provides a means for manually providing power to a DC bus at a time when it would otherwise have to be out-of-service (e.g., to perform a ,

battery discharge test during an outage, to replace a damaged cell. etc.). Crosstie breaker closed alarms are also provided to alert the operator when the units are crosstied.

Each Division 11 (21) and Division 12 (22) DC electrical power subsystem battery charger has ample power output capacity for the steady state operation of connected loads ;

required during normal operation while at the same time I

maintaining its battery bank fully charged. Each battery charger also has sufficient capacity to restore the battery from the design minimum charge to its fully charged state while supplying normal steady state loads discussed in the UFSAR Chapter 8 (Ref. 4).

l % lnsd % ;\ (se Gould kIItriu LT 03 \

% lo d %;b Cse CE b buUte:'t hs_ Zoo w fr.

Y i

i (continued)

BYRON - UNITS 1 & 2 B 3.8-49 Revision A l

i

DC Sources-Operating i B 3.8.4 4

E

, BASES :

ACTI0flS C.1 and C.2 (continued)

Condition C addresses an operating unit's DC bus that is crosstied to the opposite unit's associated DC bus, which has an inoperable source, when the opposite unit is shutdown. This provision is included to accommodate maintenance and/or testing of the shutdown unit's DC subsystems.

With the shutdown unit's battery inoperable. the operating unit will be required to supply all loads on the shutdown unit's crosstied bus should an event occur on the shutdown unit. Therefore Required Action C.1 specifies that the 5 **

possible loading on the shutdown unit's DC bus be verifie j 4

((,dA) or Zoo to De s 63 ampstonce per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Limiting thefload te-fr3 amprn ensures that the operating unit's DC subsystem will "P ( c t.t) not be overloaded in the event of a concurrent event on the operating unit. Required Action C.1 is modified by a Note only requiring Required Action C.1 when the opposite unit

_i has an inoperable battery.

4 Required Action C.2 requires the associated crosstie breaker to be opened within 7 days ensures that measures are being taken to restore the inoperable battery and reestablish independence of the DC subsystems. -

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(continued) I BYRON - UNITS 1 & 2 B 3.8-53 Revision A I

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. i DC Sources-Operating !

B 3.8.4 ,

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1 BASES l

SURVEILLANCE -SR 3.8.4.3 l REQUIREMENTS .

(continued)' A battery service test is a special test of battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power. system. The discharge rate and test. length should correspond to the .

l' design duty cycle requirements as specified in Reference 4.

The Surveillance Frequency of 18 months is consistent with ,

i the recommendt.tions of Regulatory Guide 1.32 (Ref.10) and

Regulatory Guide 1.129 (Ref. 11), which state that the battery service test should be performed during refueling l l operations or at some other outage, with intervals between tests, not to exceed 18 months.

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. This SR is modified by two Notes. Note 1 allows the performance of a performance discharge test.in lieu of a l

! service test. '

(

\nsub M - ?

The reason for Note 2 is that performing the Surveillance '

Mk PSN would perturb the electrical distribution system and i

! challenge safety systems.

or a m Sf;d gekreteUSM"'t' i

l (continued)

BYRON - UNITS 1 & 2 B 3.8-56 Revision A

4

. . Insert for page B 3.8-56 i

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( The modified performance discharge test is a simulated duty cycle consisting of just two rates - the one-minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope

} the duty cycle of the service test. Since the ampere-hours removed by a rated one-minute i

discharge represents a very small portion of the battery capacity, the test rate can be changed ,

to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test should remain above the minimum battery terminal voltage specified in the battery service

! test for the duration of time equal to that of the service test. -

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! DC Sources-Operating

! B 3.8.4

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BASES j l SURVEILLANCE SR 3.8.4.4 l REQUIREMENTS i (continued) A battery performance discharge test is a test of constant i current capacity of a battery after having been in service, to detect any change in the capacity determined by the )

acceptance test. The test is intended to determine overall

! battery degradation due to age and usage.

\# -9 G5sf The acce)tance criteria for this Surveillance are consistent l Neb l

l with IEEE-450 (Ref. 9) and IEEE-485 (Ref. 5). These l references recommend that the battery be replaced if its l capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected life, the

! Surveillance Frequency is reduced to 18 months. Degradation is indicated, according to IEEE-450 (Ref. 9). when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is a 10% below the manufacturer's rating. These Frequencies are consistent with the recommendations in IEEE-450 -

l (Ref. 9). l l

l This SR is modified by a Note. The reason for the Note is l that performing the Surveillance would perturb the i electrical distribution system and challenge safety systems.

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(continued)

BYRON - UNITS 1 & 2 B 3.8-57 Revision A

... . - . . . - . . . . . . . .-.. . ~ - . . . - . _ - _ . - . - . - . . - - . . - . -

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! ., . Insert for page B 3.8-57 a

i The modified performance discharge test is described in the Bases for SR 3.8.4.3. Either the battery performance discharge test or the modified performance discharge test is acceptable

for satisfying SR 3.8.4.4; however, only the modified performance discharge test may be used to satisfy SR 3.8.4.4 while satisfying the requirements of 3.8.4.3 at the same time.

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l DC Sources-Operating B 3.8.4 -

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, BASES'(continued) !

REFERENCES 1 10 CFR 50. Appendix A. GDC 17.

2. Regulatory Guide 1.6. March 10, 1971. l

3. IEEE-308-1978. l

4. UFSAR Section 8.3.2.1.

5. IEEE-485-1978, November 1979, t

6. 'UFSAR, Chapter 6.

7. UFSAR, Chapter 15.

8. Regulatory Guide 1.93. December 1974.

9. IEEE-450-1995. *

10. Regulatory Guide 1.32. February 1977.

11. Regulatory Guide 1.129. December 1974.

12. I EE E -4SF - 8 955.

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4 BYRON - UNITS 1 & 2 B 3.8-58 Revision A

l DC Sources-Shutcoci o

B 3.8.5 .,

l BASES i J

ACTI0NS B.1 and B.2' (continued)

Condition B addresses a shutdown unit's DC bus that is ,

crosstied to the opposite unit's associated DC bus; whicn l has an inoperable source.. when the opposite unit is also shutdown. This provision is ir)cluded to accommodate ;

maintenance and/or testing of the opposite unit's DC l subsystems. :

With the opposite unit's battery inoperable the unit-specific DC subsystem will be required to supply all !

MW 'r Z" loads on the cocosite unit's crosstied bus should an event i 39s (CD) occur on the opposite unitT Therefore. Required Action B.1 s specifies that the possiblelloading on the opposite unit's SgM DC bus be verified to be s ba ampsvonce per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

Limiting thetload tc C agc.-ensures that the unit-specific vn;b, Dc 3 DC subsystem will not be overloaded in the event of a l concurrent event on the unit. Required Action B.1 is l modified by a Note requiring Required Action B.1 when the !

opposite unit has:an inoperable battery. l Required Action B.2 requires the associated crosstie breaker ]

to be opened within 7 days ensures that measures are being taken to reestablish independence of the DC subsystems- ,

SURVEILLANCE SR 3.8.5 1 REQUIREMENTS SR 3.8.5.1 requires application of all Surveillances-required by SR 3.8.4.1 through SR 3.8.4.4. Therefore, see the corresponding Bases for LCO 3.8.4 for a discussion of l each SR. i This SR is modified by a Note. The reason for the Note is to preclude requiring the OPERABLE DC sources from being discharged below their capability to provide the required power supply or otherwise rendered inoperable during the performance of SRs. It is the intent that these SRs must still be capable of being met. but actual performance is not required.

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i (continued)

BYRON - UNITS 1 & 2 B 3.8-63 Revision A

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Battery Parameters B 3.8.6 l l

l BASES i ACTIONS fL1 kW (continued).

A float (charging) current a 2 amps [is indicative of a battery.which has been at least partially discharged. -

However. if the float current remains < 10 amps, this is indicative of a battery performing as expected when returning to a full state of charge. The completion time of l

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is based on the period necessary for a normally

! recharging battery to reach a state of full charge from the l

point at which it is capable of performing at = 80% of the ;

j manufacturer's rating.

l C.J.

With one or more batteries with one or more battery parameters outside the limits (excluding the battery I

parameter limits covered by Conditions A and B) sufficient '

capacity to supply the maximum expected load requirement is

- not assured and the corresponding DC electrical power subsystem must be declared inoperable. Additionally, other Jotentially extreme conditions, such as not completing the

lequired Actions of Condition A within the required Completion Time, are also cause for immediately declaring

the associated DC electrical power subsystem inoperable. ;

t SURVEILLANCE SR 3.8.6.1 REQUIREMENTS-This SR verifies required battery parameter testing is performed in accordance with the Battery Inspection Program.

The required parameters include the condition of the battery terminals and connectors, the battery connection resistance.

l the condition of the battery cells, cell plates, and racks.

l the electrolyte level, float voltage, and specific gravity.

l The term " connected battery cell" excludes any battery cell l l that may be jumpered out.

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(continued)

BYRON - UNITS 1 & 2 B 3.8-68 Revision A

l Battery Parameters l B 3.8.6 1

d BASES SURVEILLANCE SR 3.8.6.1 (continued)

REQUIREMENTS The BIP limits specified for electrolyte level are based on manufacturer recommendations and are consistent with the guidance in IEEE-450 (Ref. 3) with an extra 1/4 inch allowance above the high water level indication for operating margin to account for temperatures and charge effects. In addition to this allowance, the electrolyte i level is permitted to be above the specified maximum level during equalizing charge. 3rovided it is not overflowing.

These limits ensure that t1e plates suffer no physical damage and that adequate electron transfer capability is maintained in the event of transient conditions. IEEE-450 (Ref. 3) recommends that electrolyte level readings should be made only after the battery has been at float charge for at least 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

The BIP limit specified for float voltage is a 2.13 V for each individual cell. This value is based on a recommendation of IEEE-450 (Ref. 3) which states that prolonged operation of cells < 2.13 V can reduce the life expectancy of the cell.

The BIP limit specified for specific gravity for each pilot cell is a 1.200 (0.015 below the manufacturer fully charged ,

nominal specific gravity). This value is characteristic of l a charged cell with adequate capacity. According to IEEE-450 (Ref. 3). the specific gravity readings are based j on a temperature of 77'F (25'C). The specific gravity l readings are corrected for actual electrolyte temperature i andlevel For each 3'F (1.67'C) above 77'F (25'C). 1 point

[(0.001T1saddedtothereading: 1 point is subtracted for i f each 3*F below 77'F. The specific gravity of the electrolyte in a cell increases with a loss of water due to '

electrolysis or evaporation. However, correction for level is not required when battery charging current is < 2 amps when on float charge, for ack Goota hAry.1\c 9.c:4 ywth n,chy t.c) mck cz) Werf an c.cr.deJ c., ocW t aute.cg.

N Acc.edance -

I tceptmkN, kil not for luel, wh*cb 13

@ N Wkr7 M ckru:r rue - cn M ieu.

(continued)

BYRON - UNITS 1 & 2 B 3.8-70 Revision A

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Battery Parameters l B 3.8.6 l

\

BASES l l

SURVEILLANCE SR 3.8.6.3 '

REQUIREMENTS l (continued) This SR verifies specific gravity for each pilot cell is I within the limit specified in the BIP. = 1.200 (0.015 below l the manufacturer fully charged nominal specific gravity).

This value is characteristic of a charged cell with adequate capacity. According to IEEE-450 (Ref. 3), the specific gravity readings are based on a temperature of 77'F (25'C).

l The specific gravity readings are corrected for actual

.g P electrolyte temoeratura and 1 Qve . For each 3*F (1.67'C)

ptre. above 777 (25'C).1 point (0.001) is added to the reading:

gM 1 point is subtracted for each 3*F below 77'F. The specific gravity of the electrolyte in a cell increases with a loss i of water due to electrolysis or evaporation. However. !

correction for level is not required when battery charging l current is < 2 amps when on float charge.

I This SR is modified by a Note which allows either float current or specific gravity to be used to determine the state of charge of the battery, If float current is used, the specific gravity SRs (SR 3.8.6.3. SR 3.8.6.7. and SR 3.8.6.8) are not required to be met. If specific gravity is used, the float current requirement (SR 3.8.6.2) is not required to be met. Because of specific gravity gradients that are produced during the recharging process. delays of several days may occur while waiting for the specific gravity to stabilize. A stabilized charger current is an 1

( acceptable alternative to specific gravity measurement for '

determining the state of charge. This phenomenon is discussed in IEEE-450 (Ref. 3).

SR 3.8.6.4 This Surveillance verification that the average temperature of representative cells is a 60*F. is consistent with a recommendation of IEEE-450 (Ref. 3) that states that the temperature of electrolytes in representative cells should l be determined on a quarterly basis.

l Lower than normal temperatures act to inhibit or reduce l battery capacity. This SR ensures that the operating l temperatures remain within an acceptable operating ange.

l This limit is based on manufacturer recommendations.

(continued)

BYRON - UNITS 1 & 2 B 3.8-72 Revision A

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l . . Insert for page B 3.8-72

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i for each Gould battery. The specific gravity readings for each C&D battery are corrected for actual electrolyte temperature, but not for level, which is in accordance with the battery manufacturer's recommendations. '

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ATTACHMENT C i EVALUATION OF SIGNIFICANT HAZARDS CONSIDERATIONS FOR l PROPOSED CHANGES TO APPENDIX A i TECHNICAL SPECIFICATIONS OF !

FACILITY OPERATING LICENSES l NPF-37 AND NPF-66 l Commonwealth Edison has evaluated the proposed amendment and determined that it j involves no significant hazards considerations. According to 10 CFR 50.92(c), a proposed l

f ameadment to an operating license involves no significant hazards considerations if operation i j of the facility in accordance with the proposed amendment would not:

l L !

! 1. Involve a significant increase in the probability or consequences of an accident !

! previously evaluated; or ;

< 1

2. Create the possibility of a new or different kind of accident from any accident l previously evaluated; or j l

3. Involve a significant reduction in a margin of safety.

l The proposed changes allow for the replacement of the 125 volt de Gould batteries with new 125 volt de C&D batteries and revise the crosstie loading limitation.

A. The proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

The replacement C&D battery has been selected to meet or exceed the design, functional, and operational requirements of those of the present Gould battery, -

i including crosstie load limitations. The C&D batteries are similar in design to the

installed Gould batteries (e.g., electrolyte specific gravity and construction of the ;

l plates) except for capacity. The replacement C&D batteries have a significantly

!- larger capacity than the Gould batteries, which can provide additional margin for i j future use. Also, the C&D batteries are qualified for a 20 year life and meet the j l latest applicable standards. The short circuit current provided by the C&D batteries l is well within the interrupting capability of the existing DC system circuit breakers. l l

Additionally, the crosstie limit is increased to take advantage of the larger C&D battery capacity. The C&D batteries were sized based on having sufficient capacity l to energize the design basis DC loads for an operating unit with the IEEE-485 design l

margin while maintaining the desired limited DC load of 200 amps for a shutdown unit. This proposed change allows use of the C&D batteries' larger capacity.

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,- . The overall design, function, and operation of the DC system and equipment has not ,

I been altered by these changes. The proposed changes do not affect any accident

- initiators or precursors and do not alter the design assumptions for the systems or components used to mitigate the consequences of an accident as analyzed in UFSAR Chapter 15. Therefore, there is no increase in the probability or consequences of an accident previously evaluated. ]

i B. The proposed change does not create the possibility of a new or different kind of l accident from any accident previously evaluated. ;

The replacement C&D batteries will provide the same functions as those of the I

, installed Gould batteries and will be operated with the same types of operational ;

controls. These limits include battery float terminal voltage, individual cell voltage !

and electrolyte specific gravity, and crosstie loading. Crosstie conditions are allowed !

under the present Technical Specifications. The crosstie limit is increased to take ;

i advantage of the larger C&D battery capacity. The remaining changes are l administrative in nature or provide clarification to maintain consistency with other .

Technical Specifications.

l ,

The DC system and its equipment will continue to perform the same functions and be ;

l operated in the same fashion. The proposed change does not create any new or

! common failure modes. The proposed changes do not introduce any new accident !

( initiators or precursors, or any new design assumptions for the systems or components j used to mitigate the consequences of an accident. Therefore, the possibility of a new ,

l or different kind of accident from any accident previously evaluated has not been l l created. i i

C. The proposed change does not involve a significant reduction in a margin of safety.

i The replacement C&D batteries will meet or exceed the design, functional, and qualification requirements those of the installed Gould batteries. The proposed

Technical Specification limitations for the C&D batteries are derived from the same l

methodology as the Gould batteries with applied margins in accordance with IEEE 485. Increasing the crosstie loading limit takes advantage of the larger C&D battery capacity with its increased design margin. The proposed change to the crosstie loading limit will continue to conservatively envelope the postulated design requirements. The remaining changes are administrative in nature or provide clarification to maintain consistency with other Technical Specifications.

The inherent design conservatism of the DC system and its equipment has not been.

altered. The DC system and its equipment will continue to be operated with the same degree of conservatism. Therefore, there is no reduction in the margin of safety.

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! Therefore, based upon the above evaluation, Commonwealth Edison has concluded that these changes involve no significant hazards considerations.

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ATTACHMENT D !

I ENVIRONMENTAL ASSESSMENT FOR [

PROPOSED CHANGES TO APPENDIX A l

. TECHNICAL SPECIFICATIONS OF FACILITY OPERATING LICENSES '

NPF-37 AND NPF-66 9

i Commonwealth Edison has evaluated the proposed amendment and determined that it meets the criteria for a categorical exclusion set forth in 10 CFR 51.22(c)(9). This determination is based upon the following: The proposed amendment changes requirements regarding the installation and use of facility components located within the restricted area (as defined in l 10 CFR 20) and surveillance requirements; and the proposed amendment involves no !

significant hazards considerations, no change in the amount or type of any effluent that may <

be released offsite, and no increase in individual or cumulative occupational radiation ,

exposure. Pursuant to 10 CFR 51.22(b), neither an environmental impact statement nor an l environmental assessment is necessary for the proposed amendment. l i

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ML20137S534

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