Text

Proposed Tech Specs Section 3.8.5, DC Sources - Shutdown, Correcting LCO & Braidwood TS Section 3.8, Electrical Power Systems, Deleting Various References to At&T Batteries
	ML20209B741
Person / Time
Site:	Byron, Braidwood
Issue date:	06/30/1999
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML20209B737	List: ML20209B730; ML20209B741;
References
	NUDOCS 9907080006
	Download: ML20209B741 (62)
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ATTACHMENT B-1 Prepostd Ch ng:s to Technic 1 Specificatisns for Byron Station Units 1 and 2 '

9 MARKED UP PAGE FOR PROPOSED CHANGES REVISED TS PAGE Page 3.8.5-1 REVISED TS BASES PAGE (INFORMATION ONLY)

Page B 3.8.5-2 Page 1 of 3 Attachment B Byron Station TS and Bases Marked-up Pages 9907090006 990630 PDR ADOCK 05000454 p PDR

r-DC Sources --Shutdown 3.8.5 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources-Shutdown LCO 3.8.5 The_ followina shall be OPERABLEGthA lepst onagn3 (rosKle breaker Mr dwTsion4 pef:

a. One DC electrical power subsystem capable of supplying one division of the onsite Class 1E DC electrical power

( Ac.

S Wh ud d le M distribution subsystem (s) required by LCO 3.8.10.

i " Distribution System-Shutdown *p and cross & b%ke<

b. One source of DC electrical power, other than that of, required by LCO 3.8.5.a. capable of supplying the remaining onsite Class 1E DC electrical power distribution subsystem (s) when required by LCO 3.8.10.

NOTE --

One division may be crosstied to the ooposite unit, when the opposite unit is in MODE 1. 2. 3. or 4 with an inoperable battery charger.

APPLICABILITY: MCDES 5 and 6.

During movement of irradiated fuel assemblies.

ACTIONS NOTE LCO 3.0.3 is not applicable.

CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required A.1 Declare affected Immediately DC electrical power required feature (s) subsystems inoperable inoperable.

! for reasons other than i

Condition B. OR (continued)

I BYRON - UNITS 1 & 2 3.8.5 - 1 Amendment @

DC Sources - Shutdown B 3.8.5 l

BASES I LCO The DC electrical power subsystems with: d5 esocM on ak b a. at least one subsystem consisting of battery and one c4 4*.<. battery charger.:

es.c.L.+e.L c,<.ww. Wukan, b. when the redundant division of the Class 1E DC electrical power distribution subsystem is required by k g-6, u. t b ' LC0 3.8.10. the other subsystem consisting of EfUiiP)'a f ,g batter acharger(and p o,- e,mmA _w, 7 ,

c. the corresponding control equipment. M interconnecting cabling within the division (s) are required to be OPERABLE to support h red division (s) of the distribution systems required OPERABLE by LC0 3.8.10.-

" Distribution Systems-Shutdown." This ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of. postulated events during shutdown (e.g..

fuel handling accidents) J F thermor , at le,asT. one yrna russyie orpener ppr divis' is re ired pf be operytjo airfain indepeneence be een the nits. f t

l LC0 3.8.S is modified by a Note which allows one division to be crosstied to the opposite unit, when the opposite unit is

! in MODE 1. 2. 3. or 4 with an inoperable charger. No load restrictions are placed on the bus loading, when the one division is crosstied.

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LC0 3.8.5.b allows the option to use a battery, a charger.

' or the crossties to the opposite unit's associated DC bus to ;

maintain power to the redundant Class 1E DC electrical power distribution subsystem (s) when required by LCO 3.8.10. This l provision accommodates the re testing of the shutdown unit' s DCquired maintenance electrical power and/or distribution subsystem (s) and continues to maintain the required redundant equipment OPERABLE.

l l BYRON - UNITS 1 & 2 B 3.8.5 - 2 Revision [

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ATTACHMENT B-2 Prcpscrd Chr.ngIs to Technic 1 Specificati n2 for Braidwood Station Units 1 and 2 MARKED UP PAGES FOR PROPOSED CHANGES 1

REVISED TS PAGE Page 3.8.5-1 l l

REVISED TS BASES PAGE (INFORMATION ONLY) l l Page B 3.8.5-2 MARKED-UP PAGES FOR PROPOSED ADMINISTRATIVE CHANGES REVISED TS PAGE 1

l l Page 3.8.4-2 l Page 3.8.4-3

! Page 3.8.4-4 Page 3.8.4-5 Page 3.8.4-6 Page 3.8.5-3 Page 3.8.6-4 Page 3.8.9-2 REVISED TS BASES PAGE (INFORMATION ONLY)

Page B 3.8.4-2 Page B 3.8.4-3 l Page B 3.8.4-7 Page B 3.8.4-8 Page B 3.8.4-9 Page B 3.8.4-10 Page B 3.8.4-15 Page B 3.8.4-16 Page B 3.8.5-5 Page B 3.8.6-5 Page B 3.8.6-6 Page B 3.8.6-7 Page B 3.8.9-7 Page B 3.8.9-9 Page 1 of 25 Attachment B Braidwood Station TS and Bases Marked-up Pages L

DC Sources -Opere::n:

ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME C. One DC electrical C.1 --

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

electrical power --

subsystem with an inoperable source. Verify opposite-unit Once per while opposite unit is DC bus load 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months in MODE 5. 6. or leu am6s faf A?&h defueled. s 200 amps (F#fo6D).

AND C.2 Open at least one 7 days crosstie breaker between the crosstled divisions.

One c electrical D.1 Ope at least one 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months

' j po r division sstie breaker osstied to between the cro atied

, opposite-unit C divisions.

electrical wer subsyste hen replac g Unit 2 AT&T bat rles while opposite unit is 'n MODE 1, 2. 3.

/

4. /

/

(continued)

BRAIDWOOD - UNITS 1 & 2 3.8.4 - 2 Amendmenth

^

DC Sources -Doerannc 05 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME l b h l l One DC electrical @.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. i other than Condition 1 A. B.@ @ h t2 NOTE- ' ;

Only appl e when i replaci batt s.

nit 2A[T&T l estore DC e .ctrical 10 ys l power sub tem to OPERABLE status, i

l uired Action and i 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. AN_Q g

l 2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months I

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BRAIDWOOD - UNITS 1 & 2 3.8.4 - 3 Amendmenth

DC Sources-Doe a ng SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUE O SR 3.8.4.1. Verify battery terminal voltage is ___ 7 days F WI 5X forAT&P) 127.6 V (FVC8DOon float charge.

SR 3.8.4.2 Verify no visible corrosion at battery 92 days terminals and connectors.

Y Verify battery connection resistance is s l'.5E-4 ohm'for inter-cell connections.

s 1.5E-4 ohm.for inter-rack connections, s 1.5E-4 ohm for inter-tier connections, and s 1.5E-4 ohm for terminal connections.

SR 3.8.4.3 Verify battery cells. cell plates. and 18 months racks show no visual indication of physical damage or abnormal deterioration that could degrade battery performance. i SR 3.8.4.4 Remove visible terminal corrosion. verify 18 months battery cell to cell and terminal connections are clean and tight, and are coated with anti-corrosion material.

SR 3.8.4.5 Verify battery connection resistance is 18 months s 1.5E-4 ohm for inter-cell connections, s 1.5E-4 ohm for inter-rack connections.

s 1.5E-4 ohm for inter-tier connections, and 5 1.5E-4 ohm for terminal connections.

(continued)

BRAIDWOOD - UNITS 1 & 2 3. 8. 4 - 4 Amendment @

DC Sources - Doer 5p n; 3E- ,

SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUEtD SR 3.8.4.6 Verify each battery charger supplies a load 18 montns

' equal to the manufacturer's rating for a 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

SR 3.8.4.7 NOTES-- -

1. The modified performance discharge test in SR 3.8.4.8 may be performed in lieu of the service test in SR 3.8.4.7.

2. This Surveillance shall not be !

performed in MODE 1._2. 3. or r ng repjecemesn. 01 tre Ai&I b terley

. Verify battery capacity is adequate to 18 months supply, and maintain.0PERABLE status. the required emergency loads for the design duty cycle when subjected to a battery service test.

(continued) l i

1 BRAIDWOOD - UNITS 1 & 2 3.8.4 - 5 Amendmenth l l

DC Sources-Doeran:

s SURVEILLANCE RE0UIREMENTS (continued) ,

SURVEILLANCE FREQUEN^i SR 3.8.4.8 NOTE-This Surveillance shall not be performed in MODE 1. 2, 3. .ep hartpri t ay1 T or 4 sp&T i pu rewmen thpAT e.

. Verify batterv capacity is(E~K:Kr M 60 months !

@ 80% ror CXh of the manufacturer s - '

rating when subjected to a performance AND "

discharge test or a modified performance discharge test. 12 months when battery shows !

~

degradation or has reached 85% ,

of the expected life with capacity < 100%

of manufacturer's rating AND' 24 months when battery has reached 85% of the expected life with capacity a 100%

of manufacturer's rating f

BRAIDWOOD - UNITS 1 & 2 3.8.4 - 6 Amendment @

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p DC Sources - Snutdown 3.8.5 l

l 3.8 ELECTRICAL POWER SYSTEMS

' 3.8.5 DC Source's-Shutdown LCO 3.8.5 The following shall be OPERAB1.Ef w1pt at least orguh (troswe DreaKerger a;aris1orf opeg:

a. One DC electrical power subsystem capable of supplying

.g

' I" 9 one division of the onsite Class 1E DC electrical power 0*c "^'

' distribution subsystem (s) required by LCO 3.8.10.

c ron46 h"aui " Distribution System-ShutdownA": and

g. #

b. One source of DC electrical power. other than that required by LCO 3.8.5.a. capable of supplying the j

remaining onsite Class 1E DC electrical power !

distribution subsystem (s) when required by LCO 3.8.10.

NOTE i One division may be crosstied to the opposite unit. when the j opposite unit is in MODE 1. 2. 3. or 4 with an inoperable f battery charger. !

1 APPLICABILITY: MODES 5 and 6.

During movement of irradiated fuel assemblies. !

i ACTIONS NOTE LCO 3.0.3 1s not applicable.

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CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required A.1 Declare affected Immediately DC electrical power required feature (s) subsystems inoperable inoperable.

for reasons other than Condition B. OR (continued)

BRAIDWOOD - UNITS 1 & 2 3.8. 5 - 1 Amendmenth

DC Sources -Shutdoc 3.E.5 I ACTIONS (continued)

{

CONDITION REQUIRED ACTION COMPLETION TIM l

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 100 emo vt M !

defueled. hr- 200 amps @? CMD. l AND B.2 Open at least one 7 days l crosstie breaker l between the crosstied '

divisions.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.5.1 NOTE The following SRs are not required to be performed: SR 3.8.4.6. SR 3.8.4.7. and SR 3.8.4.8.

For DC sources required to be OPERABLE. the In accordance following SRs are applicable: with applicable SRs SR 3.8.4.1 SR 3.8.4.5 SR 3.8.4.2 SR 3.8.4.6 SR 3.8.4.3 SR 3.8.4.7 SR 3.8.4.4 SR 3.8.4.8.

BRAIDWOOD - UNITS 1 & 2 3.8.5 - 3 Amendment @

Battery Cell Parameters 3.8.6 Table 3.8.6 1 (page 1 of 1)

Battery Cell Parameters Reautrements CATEGORY A: CATEGORY B: CATEGORY ;-

LIMITS FOR EACH l LIMITS FOR EACH CONNECTEC ALL0nASLE LIMITS FOR EACr PARAMETER ~ DESIGNATED PILOT CELL CELL CONNECTEC CELL i

Electrolyte Level > Minimum level I

> Minimun level Above too of clates. enc Indication mark, and s $4 Indication marx. anc s y not overflowing inen aoove max 1y' level inch above maxim l l Indication mark indication mark' g eve Float Voltage _

( f >

Soecific Gravity (CIIdI N' AT&'. i ' ?an AT ,

Nct more than 0.023 below a 00 'C - = 1.195 'r t' average of ali connecte:

cells AND

~

AND

~

Avera9e of all coaaetted cells CA.6'9O Ud&i Avera a of *"~~a- ec

- 1.205M91/ -

cells 80(pia a 1.19 _&S V (a) It is acceotable for the electrolyte level to temocra*11y increase acove the soecified maximum curing equalizing enaages provided it is not overflowing.

(c' Cyrected for averaQe electrolyte ternceratu'*

(c) d erec y for ecc e- ar ea ann Wel feeM Corrected for electrolyte temperature N p or spes; ne w corre d or n r s -avoeo~ A nwever_ # en caa rery er r =w= ,

< r amn a c- - s tjyce (d) A sattery charging cu r rent of FA-aVor tMT k ~1 amos ^ @ wnen on float cnarge is acceptav e meeting specific gravity limits toHowing a Datteey recharge, a maximum of 7 days. When charging ..

Current 1$ Used to satisfy specific gravity requirements, specific gravity of each Connected cell shall be measured prior to expiration of the 7 day allowance.

i BRAIDWOOD - UNITS 1 & 2 3.8.6 - 4 Amendment @

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, Distribution Systems-Oper n ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One AC electrical A.1 Restore AC electrical 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months power distribution power distribution subsystem inoperable. ~ ~ - ' ~ ~

subsystem to OPERABLE AND status.

16 hours1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months from discovery of failure to meet LCO le B. One AC instrument bus B.1 Restore AC instrument 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months -

electrical power bus electrical power distribution subsystem l distribution AND I inoperable. subsystem to OPERABLE l status. 16' hours from discovery of failure to meet LCO l

C. One DC electrical l C.1 Restore DC electrical 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months power distribution power distribution subsystem inoperable. subsystem to OPERABLE AND status.

16 hours1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months from discovery of failure to meet LCO

@H C.2 ' NOTE Only a licable whe repl ing Unit 2 &T bat erles.

Restore DC e ectrical days power distr bution subsystem oOPERABLE/

status. /

(continued)

BRAIDWOOD - UNITS 1 & 2 3. 8. 9 - 2 Amendmenth l

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' DC Sources - Doerating E3E4 i

BASES BACKGROUND (continued)

The DC power distribution system is described in more oetal i l

l in Bases for LC0 3.8.9. " Distribution System-Operating.'~ !

l and LCO 3.8.10. " Distribution Systems - Shutdown. "

l Each battery was sized based upon supplying the design cuty 3 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 batterv has a nominal rating of 0 6V amaefe-heOrs tor A7&T 123'20 ampere-hours @

@ at the 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months discharge rate to an end voltage of 1.75 volts per cell, and was sized based upon continuously carrying the various estimated loads. The batteries were sized in accordance with IEEE-485-1983 (Ref. 5).

Each 125 VDC battery is separately houseo 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 ;

redundant Class 1E subsystems, such as batteries. battery j chargers, or distribution panels. While it is possible to 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 :

a DC source. 1 i

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BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 2 Revisionh 1

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r DC Sources-Operat3ng

. 6:c-I BASES BACKGROUND (continued) l l The crosstie between 125 VDC ESF buses 111 and 211 and the !

l' crosstle between 125 VDC ESF buses 112 and 212 are eacn provided with two normally locked open, manually operatec l

circuit breakers. No interlocks are provided since tne interconnected buses are not redundant. However if one l l battery is inoperable, procedural and administratlye l controls are used to limit the connected load to @tr a:P$D

$r/AIXI 3200 amps (PorC&O based on not exceeding tne l OPERABLE battery capacity. These controls ensure that combinations of maintenance and test operations will not preclude the system capabilities to 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 I tems 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 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 within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months while supplying normal steady state loads discussed in the UFSAR. Chapter 8 (Ref. 4).

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- BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 3 Revision (p i

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BASES ACTIONS (continued)

C 1 and C 2 Condition C addresses an operating unit's DC bus that !s crosstied to the opposite unit's associated DC bus. wnich has an inoperable source (i.e. battery or battery charger) .

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 snutdown unit's crosstled bus should an event occur on the shutdown unit. Therefore Required Action C.1 specifies that the possible loading on the shutdown unit's DC s be verifled to be $E0 aws Jer AukTJs 200 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Limiting the load to COVamomorA&T 3200 amps d# CEb ensures that the operating unit's DC subsystem will 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 has an inoperable battery.

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

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 7 Revision @

DC Sources -Doerat~ i B 3.i -

8ASES ACTIONS (continued)

D._1 (Con'dition D 1s only applicable when replacing the Unit 2 AT&T batter s (i.e.. old atteries) with the C&D Datteries (1.e.. n batteries). n order to rep ce the AT&T batter ~ s. temporary tteries will b connected t the D:

bus ter the old b teries are dis nnected. T _ temporary ba erles will be onnected to th DC bus thro n the same aker used to onnect the old atteries, order to prevent de-en gizing the DC s while con cting the temporary b eries, the Un' 2 DC bus w1 be crosstled to Unit 1. O e the existin charger and e temporary batterie are connected o the DC bus. at least one osstle breaker will be opene . The 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ompletion Tim ^ allows suff' 1ent time to s ely disconn t the old bat . ries and re nnect the temp ary batteri and existing arger to e Unit 2 DC bu . The 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months Completion Ti also allow sufficient ti to safely di connect the te orary batteries an reconnect t new batteries nd existin charger to e Unit 2 DC us. This Com etion Time s acceptabl based on co ensatory meas' es to open e DC crossti breaker dur g adverse con ions.

l (E1andE_2[

l Condition represents one division with a loss of ability to completely respond to an event, and a potential loss of ability for the DC division to remain energized during normal operation. It is therefore, imperative that the operator's attention focus on stabilizing the unit, minimizing the potential for complete loss of DC power to the affected division. The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months limit is consistent with the allowed time for an inoperable DC distribution system division.

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 8 Revision @

DC Sources -Opera:1ng eet -

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BASES ACTIONS (continued) l If one of the required DC electrical power subsystems is inoperable (e.g. . inoperable battery or one DC c1 vision crosstled to the opposite-unit DC division tnat does not have an inoperable battery charger), the remaining D:

electrical power subsystem has the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent worst case single failure would. however.

result in the complete loss of the remainina 125 VDC electrical power subsystems with attendant loss of ESF functions continued power operation should not exceed 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months Completion Time is based on Regulatory Guide 1.93 (Ref. 8) and reflects a reasonable time to assess unit status as a function of the inoperable DC electrical power subsystem and. if the DC electrical power subsystem 1s not restored to OPERABLE status. to prepare to effect an orderly and safe unit shutdown.

fl{equired Action E.2 is only applicablp when replacing Dthe Unit 2 T batterie i.e., old b M eries) with e C&D \

batte 'es (i.~..

e n batteries). n order to r ace the

, AT& atteries, porary batt ies will be c nected to the D us after t old batteri are disconne ed. The l mporary ba eries will b the AT&T batt ies previousiv i removed on it 1. Ther ore, the temp ary batteries ill i fulfill t same safet related requi ments as the d batteri .. and the D electrical p r subsystem w 1 be in accor nce with cur ent design ba s. However. e to not ,

l bein seismicall ounted, the electrical p er subsystem wi be inoper e during the eriod when th temporary b tteries are nstalled. T . 10 day Compl ion Time al ws sufficient me to safely erform the ac vities asso ated with repl ing the AT&T atteries with e C&D batte es.

The 10 y Completion ime is based the redunda capabi ities afford by the OPERA DC electri 1 power ,

subsystem and the ow probabilit of an event pccurring Quringthisperi /

l BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 9 Revision @

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, DC Sources-Operating B r e.-

BASES ACTIONS (continued) g g l 1 and( 2 If-the inoperable DC electrical power subsystem cannot be restored to OPERABLE status, or the crosstle breaker (s) cannot be opened, within the required Completion Time. the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and to MODE 5 within

'36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable.

based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging plant systems. The Completion Time to bring the unit to MODE 5 is consistent with the time required in Regulatory Guide 1.93 (Ref. 8).

SURVEILLANCE SR 3.8.4.1 REQUIREMENTS Verifying battery terminal voltage while on float charge helps to ensure the effectiveness of the charging system and the ability of the batteries to perform their intended function. Float charge is the condition in which the charger is supplying the connected loads and the continuous charge required to overcome the internal losses of a battery 1 and maintain the battery in a fully charged state. The voltage requirements are based on the nominal design voltage of the battery and are consistent with the initial voltages assumed in the battery sizing calculations. The 7 day Frequency is consistent with manufacturer recommendations and IEEE-450 (Ref. 9).

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BRAIDWOOD~- UNITS 1 & 2 B 3.8.4 - 10 Revision %

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DC Sources-Operat;ng t .: . e I

- BASES SURVEILLANCE REQUIREMENTS (continued)

SR 3.8.4.8 A battery performance discharge test is a test of constan current capacity of a battery, normally done in the as founc condition.~after having been in service. to detect any change in the capacity determined by the acceptance test.

I The test is intended to determir.e overall battery degradation due to age and usage.

A battery modified performance discharge test is described in the Bas 3s for SR 3.8.4.7 Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.4.8. however, only the modified performance discharge test may be used to satisfy SR 3.8.4.8 while satisfying the requirements of SR 3.8.4.7 at the same time.

/%I51 6 teries: T&T batter manufact er's data indicates tha he capaci of the tery act ly increase over its s ice life The NRC s concurr that the ba ery meets I cceptable perating iteria if t can be sho that battery pacity fo the AT&T tteries is least 95% f the ma facturer' rating w subjected a perform ce disc rge test ery 60 m hs.

LC&D Batter' JThe acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 9) and IEEE-485 (Ref. 5). These references recommend that the battery be replaced if its 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.

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 15 Revision @

DC Sources -Operatinc B 3.6 BASES SURVEILLANCE REQUIREMENTS (continued) i The Surveillance Frequency for this test is normally l

60 months. If the battery shows degradation. or if tne battery has reached 85% of its expected life and capacity is

< 100% of the manufacturer s rating, the Surveillance Frequency is reduced to l'2 months. However if the batter.s

shows no aegradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity a 100% of the manufacturer's rating. Degradation is indicated according to IEEE-450 (Ref. 9). when the lattery capacity drops by mor than 5 M ore m 310% C5F' AD l relative to its caoacity on the previous performance test or when it is P K forAM) d> 10% Cor'C&D below the manufacturer's rating. These Frequencies are consistent with the recommendations in IEEE-450 (Ref. 9).

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

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

2. Regulatory Guide 1.6, March 10, 1971.

3. IEEE-308-1978. l

4. UFSAR, Section 8.3.2.1.

b. IEEE-485-1983. June 1983.

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.

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 16 Revision 2

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DC Sources-Shutdown B 3.8.5 BASES t

The DC electrical power subsystems with:

LC0 oxoch

c. a uf le% a. at least one subsystem consisting of@ battery and

% ,# -h. <. -

battery chargeJ: ]

f y %-A

,4 b. when the redundant division of the Class 1E DC electrical power distribution subsystem is required by

'jf "f'^

LC0 3.8.10 the other subsysten consisting of @Y5eb a batter p a charger 4 and ,

.g 44 Wh c. the corresponding control equipment, and interconnecting cabling within the W "* "#

vion (s) 6 are required to be OPERABLE to support required division (s) of the distribution systems required OPERABLE by LCO 3.8.10.

" Distribution Systems-Shutdown." This ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to miti,Jte the '

consequences of postulated events durina shutdown (e.a..

fuel handling accidents).J Furthe ore. W least A ne unil posstAe breaky per diffsion requip (d to tropen t ;

Emai>(ain inde0endence 4etween he unit y LC0 3.8.5 is modified by a Note which allows one division to be crosstied to the opposite unit, when the opposite unit is in MODE 1. 2, 3. or 4 with an inoperable charger. No load restrictions are placed on the bus loading, when the one division is crosstied.

LC0 3.8.5.b allows the option to use a battery, a charger, or the crossties to the opposite unit's associated DC bus to maintain power to the redundant Class 1E DC electrical power distribution subsystem (s) when required by LC0 3.8.10. This provision accommodates the required maintenance and/or 1

testing of the shutdown unit's DC electrical power distribution subsystem (s) and continues to maintain the required redundant equipment OPERABLE.

BRAIDWOOD - UNITS 1 & 2 B 3.8.5 - 2 Revision @

l

1 DC Sources-Shutdown B 3.8.5 BASES l l

ACTIONS (continued) I B.1 and B.2 Condition B addresses a shutdown 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 also shutdown. This provision is included to accommodate maintenance and/or testing of.the opposite unit's DC subsystems.

With the opposite unit's battery inoperable, the unit-specific DC subsystem will be required to supply all loads on the opposite unit's crosstied bus should an event I occur on the opposite unit. Therefore. Required Action B.1 1 specifies that the possible loading on the cocosite unit's DC bus be verified to be cs 260 mts Mr APuT} 200 amps q) nce per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Limiting' the load to GWames fe .

00 amps dN. ensures that the unit-specific DC '

s tem will not be overloaded in the event of a concurrent event on the unit. Required Action B.1 is modified by a Note requiring Required Action B.1 when the opposite unit has an inoperable battery. l 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. !

l SURVEILLANCE SR 3.8.5.1 l REQUIREMENTS SR 3.8.5.1 requires application of all Surveillances

required by SR 3.8.4.1 through SR 3.8.4.8. Therefore, see I

the corresponding Bases for LCO 3.8.4 for a discussion of each SR.

T' SR is modified by a Note. The reason for the Note is

'O <reclude requiring the OPERABLE DC sources from being oi., charged 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 j still be capable of being met, but actual performance is not required.

BRAIDWOOD - UNITS 1 & 2 B 3.8.5 - 5 Revision $

1 Battery Cell Parameters ;

B 3.8.6 {

BASES SURVEILLANCE REQUIREMENTS (continued)

Table 3.8 6-1 l l

This table delineates the limits on electrolyte level. float )

voltage, and specific gravity for three different l categories. The meaning of each category is discussed {

below. j 1

Category A defines the normal Jarameter limit for each designated pilot cell in each nttery. The cells selected {

as pilot cells are those whose temperature, voltage, and j electrolyte specific gravity approximate the state of charge of the entire battery.

The Category A limits specified for electrolyte level are based on manufacturer recommendations and are consistent with the guidance in IEEE-450 (Ref. 3), with the extra l k inch allowance above the high water level indication for l operating margin to account for temperatures and charge j effects. In addition to this allowance, footnote (a) to Table 3.8.6-1 permits the electrolyte level to be above the specified maximum level during equalizing charge. 3rovided l it is not overflowing. These limits ensure that t1e plates suffer no pnysical damage, and that adequate electron transfer capability is maintained in the event of transient I 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 Ccte ory A limit specified for float voltage isGDETPD F 2.13 V & CRIB per cell. This value is based on the recommendations of IEEE-450 (Ref. 3), which states that prolonged 03eration of cellsm8#for AT&D

@ 2.13 V WC&D can reduce the life expectancy of cells.

The Category A limit specified for specifi avity for each pilot cell is G F 285 for ACT 1 1.200

~

C&D (0.015 l below the manufacturer fully charged nominal specific i gravity or a battery charging current that had stabilized at i a low value). 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 l temperature of 77 F (25 C). !

l BRAIDWOOD - UNITS 1 & 2 B 3.8.6 - 5 Revision $

r Battery Cell Parameters i B 3.8.6 )

BASES j SURVEILLANCE REQUIREMENTS (continued)

The specific gravity readings are corrected fnr utnal i electrolyte temperature ang ie Jv y gfTAT/for adtdl) l celecyclyte tem 3eriture f6r C&W. For each 3 F (1.67 C) aDove // F (25";). 1 point (0.001) is added to the reading:

1 point is subtracted for each 3*F below 77'F.

Category B defines the normal parameter limits for each ,

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

1 The Category B limits specified for electrolyte level and l l float voltage are the same as those specified for Category A l and have been discussed above. Footnote (b) to Table 3.8.6-1 requires the float voltage correction for average electrolyte temperature. The Category B limit specified for soecific gravit r each connected cell is GE28D forAT&T/> 1.195 C (0.020 below the manufacturer fully charged, nominal specific oravity) with the average of all connected cells CD'29Pfor. AT&G> 1.205 GPTRib (0.010 below the manufacturer fully charged, nominal specific gravity). These values are based on manufacturer's recommendations. The minimum specific gravity value required for each cell ensures that the effects of a highly charged or newly installed cell will not l

mask overall degradation of the battery.

Category C defines the limits for each connected cell.

These values, although reduced, provide assurance that sufficient capacity exists to perform the intended fur

and maintain a margin of safety. When any battery parameter is outside the Category C limits, the assurance of sufficient capacity described above no longer exists, and the battery must be declared inoperable.

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i BRAIDWOOD - UNITS 1 & 2 B 3.8.6 - 6 Revision ($

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1 Battery Cell Parameters I B 3.8.6 BASES SURVEILLANCE REQUIREMENTS (continued)

The Category C limits specified for electrolyte level (above the top of the plates and not overflowing) ensure that the plates suffer no physical damage and maintain adequate electron transfer capability. The Category C limits for i float voltage is based on IEEE-450 JRef. 3), which states l that a cell voltage of e A V #6r AMT72.07 V LTV C&O) or i below, under float conditions and not caused by elevated temperature of the cell, indicates internal cell problems and may require cell replacement.

The Category C limit of average specific gravity (ir280401) 00TPb 1.195 Cort &UD is based on manufacturer l recommendations (0.020 below the manufacturer recommended !

fully charged, nominal specific gravity). In addition to '

that limit, it is required that the specific gravity for each connected cell must be no less than 0.020 below the !

average of all connected cells. This limit ensures that the '

effect of a highly charged or new cell does not mask overall !

degradation of the battery. l l

The footnotes to Table 3.8.6-1 are applicable to Category A.

B. and C specific gravity. Footnote (c) to Table 3.8.6-1 '

requires the above mentioned correction for electrolyte rievelanMemperatureftfrAT&T(trelectrolyetemperaur ffor &D). w in tne ception th level corr ction (f A T) is r t requi d when ba ery chargi current s 4

< 2 amp on floa charge. T s current ovides. /

(genera , an indi ation of o erall (AT&T battery onditfong 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 acceptable alternative to s)ecific gravity measurement for determining the ste% of c1arge. This phenomenon is discussed in IEEE-450 (Rei. 3).

Footnote (d) to Table 3.8.6-1 allows the float charge current to be used as an alternate to specific gravity for up to 7 days following a battery recharge. Within 7 days, each connected cell's specific gravity must be measured to confirm the state of charge. Following a minor battery recharge (such as equalizing charge that does not follow a deep discharge) specific gravity gradients are not significant, and confirming measurements may be made in less than 7 days.

BRAIDWOOD - UNITS 1 & 2 B 3.8.6- 7 Revision $

Distribution Systems-Operating

- E 3.E.9 BASES ACTIONS (continued) !

I The second Completion Time for Required Action B.1 establishes a limit on the maximum allowed for any combination of required distribution subsystems t'o be inoperable during any single contiguous occurrence of failing to meet the LCO. If Condition B 1s entered while.

for instance, an AC bus is inoperable and subseauently returned OPERABLE. the LCO may already have been not inet for up to 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . This could lead to a total of 10 nours.

since initial failure of the LCO. to restore tne instrument bus distribution system. At this time, an AC bus could again become inoperable, and instrument bus oistribution l restored OPERABLE. This could continue indefinitely. I This Completion Time allows for an exception to the normal

" time zero" for beginning the allowed outage time " clock."

This will result in establishing the " time zero" at the time the LC0 was initially not met, instead of the time Condition B was entered. The 16 hour1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months Completion Time is an acceptable limitation on this potential to fail to meet the LCO indefinitely.

l C.1laidCA]

With one DC bus inoperable, the remaining DC electrical power distribution subsystem is capable of supporting the minimum safety functions necessary to shut down the reactor and maintain it in a safe shutdown condition, assuming no ,

single failure. The overall reliability is reduced. '

however, because a single failure in the remaining DC electrical power distribution subsystem could result in the minimum required ESF functions not being supported.

Therefore. the DC bus must be restored to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months by powering the bus from the associated battery or charger.

BRAIDWOOD - UNITS 1 & 2 B 3.8.9 - 7 Revision @

l L-

o

..- Distribution Systems - Operating

. E 3.8 3 BASES ACTIONS (continued)

The second Completion Time for Required Action C.1 establishes a limit on the maximum time allowed for any combination of required distribution subsystems to be l inoperable during any single contiguous occurrence of

! falling..to meet the LCO. If Cona1 tion C is enterec wnlie.

for instance. an AC bus is inoperable and subsequently l l

returned OPERABLE. the LC0 may already have been not met for up to 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . This could lead to a total.of 10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months .

since initial failure of the LCO. to restore the DC l cistribution system. At this time, an AC bus could again I become inoperable, and DC distribution restored OPERABLE.

This could continue indefinitely.

This Completion Time allows for an exception to the normal

" time zero" for beginning the allowed outage time " clock."

This will result in establishing the " time zero" at the time the LCO was initially not met, instead of the time Condition C was entered. The 16 hour1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months Completion Time is an acceptable limitation on this potential to fail to meet the LC0 indefinitely.

(Required Ction C.2 is only applicable when replacing the Unit 2 &T batterie (i.e., old ba eries) with the C&D batt les-(i.e.. batteries). n order to replace the AT batteries, emporary batt les will be co cted to the bus after e old batteri are disconnec+ d. The temporary b teries will b the_AT&T batter es previously t removed o nit 1. Ther ore, the tempor ry batteries wi fulfill e same safet related requir nts as the ol batter ~es, and the D electrical pow subsystem wil e in I acc dance with cu ent design bas' . However, du to not b 'ng seismicall mounted, the D electrical pow subsystem will be.inoper le during the riod when the mporary batteries ar installed. Th 0 day Complet' n Time allows sufficient ime to safely rform the acti ties associate tteries with e C&D batteries with The 10repaycing the AT&T ~ me is based o he redundant Completion capabilities afforde y the OPERAB DC electrical wer subsystem and the probability f an event occu ing during this perl .

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1 BRAIDWOOD _ UNITS 1.& 2 B 3.8.9 - 9 Revision @

i ATTACHMENT B-3 Pr:peasd Chrngis ts Tschnicil Specifications for Byron Station Units 1 and 2 r

l lNCORPORATED PROPOSED CHANGES, TYPED PAGE

? 1 l

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REVISED TS PAGE Page 3.8.5-1 REVISED TS BASES PAGE (INFORMATION ONLY) l Page B 3.8.5-2 l

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Page 1 of 3 Attachment B Byron Station

! TS and Bases Typed Pages l

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DC Sources - Shutdown l -- 3.8.5 l

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3.8 ELECTRICAL POWER SYSTEMS _

{;

3.8.5 DC Sources-Shutdown

)

l LC0 3.8.5 The following shall be OPERABLE: l l

a. l OneDCelectricalpowersubsystemcapableofsup$ying one division of the onsite Class 1E DC electrica power distribution subsystem (s) required by LCO 3.8.10.

" Distribution System-Shutdown." with at least one unit crosstie breaker open; and {

b. One source of DC electrical power, other than that t required by LC0 3.8.5.a. capable of supplying the remaining onsite Class 1E DC electrical )ower distribution subsystem (s) when required )y LCO 3.8.10.

NOTE --

One division may be crosstied to the opposite unit, when the opposite unit is in MODE 1. 2. 3. or 4 with an inoperable battery charger. I APPLICABILITY: MODES 5 and 6.

During movement of irradiated fuel assemblies.

< \

-ACTIONS

-NOTE i LCO 3.0.3.is not applicable. l CONDITION REQUIRED ACTION COMPLETION TIME

--A. One or more required A.1 Declare affected Immediately DC electrical power- required feature (s) subsystems ino>erable ,- inoperable.-

for reasons otler than Condition B. QR (continued) l BYRON - UNITS 1 & 2 3.8.5 - 1 Amendment

DC Sources-Shutaown

!. B 3.8.5 BASES' LC0 The DC electrical power subsystems with:

a. at least one subsystem consisting of its associated battery and battery charger and at least one of the i associated crosstie breakers open to maintain j independence between the units; l

b. when the redundant division of the Class 1E DC electrical power distribution subsystem is required by LCO 3.8.10, the other subsystem consisting of a -

battery, a charger, or crosstied to the opposite unit:

and

c. the corresponding control equipment, and interconnecting cabling within the division (s) are required to be OPERABLE to support the~ required l division (s) of the distribution systems required OPERABLE by LC0 3.8.10. " Distribution Systems -Shutdown." This ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of postulated events'during shutdown (e.g..

fuel handling accidents).

l LCO 3.8.5.b allows the option to use a battery, a charger.

or the crossties to the opposite unit's associated DC bus to maintain power to the redundant Class 1E DC electrical power distribution subsystem (s) when required by LCO 3.8.10. This provision accommodates the required maintenance and/or testing of the. shutdown unit's DC electrical power distribution subsystem (s) and continues to maintain the required redundant equipment OPERABLE.

l LCO 3.8.5 is modified by a Note which allows one division to l

be crosstied to the opposite unit, when the opposite unit is in MODE 1, 2. 3. or 4 with an inoperable charger. No load restrictions are placed on the bus loading, when the one division is crosstied.

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BYRON - UNITS 1 & 2 83.8.5-2 Revision

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ATTACHMENT B-4 !

Proposed Changes to Technical Specifications for Braidwood Station Units 1 and 2 l

j l

INCORPORATED PROPOSED CHANGES, TYPED PAGES l REVISED TS PAGE Page 3.8.5-1 REVISED TS BASES PAGE (INFORMATION ONLY)

Page B 3.8.5-2 INCORPORATED PROPOSED ADMINISTRATIVE CHANGES, TYPED PAGES REVISED TS PAGES 1

Page 3.8.4-2 .

Page 3.8.4-3 )

Page 3.8.4-4 l

Page 3.8.4-5 i Page 3.8.5-3 Page 3.8.6-4 Page 3.8.9-2 Page 3.8.9-3 REVISED TS BASES PAGES (INFORMATION ONLY)

Page B 3.8.4-2 Page B 3.8.4-3 Page B 3.8.4-7 Page B 3.8.4-8 Page B 3.8.4-9 Page B 3.8.4-10 Page B 3.8.4-11 Page B 3.8.4-12 Page B 3.8.4-13 Page B 3.8.4-14 Page B 3.8.5-5 Page B 3.8.6-5 Page B 3.8.6-6 Page B 3.8.6-7 Page B 3.8.9-7 Page B 3.8.9-9 Page B 3.8.9-10 Page 1 of 28 Attachment B Braidwood Station TS and Bases Typed Pages

DC Sources -Operating 3.8.4 ACTIONS (continued)

CONDITION REQUIRED ACTION ~ COMPLETION TIME C. One DC electrical C.1 - NOTE--

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

electrical power subsystem with an inoperable source, Verify opposite-unit Once per while opposite unit is DC bus load 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months in MODE 5. 6. or s 200 amps.

defueled.

AND C.2 Open at least one 7 days crosstie breaker between the crosstied divisions.

D. One DC 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 A B, or C.

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 l Associated Completion Time not met. MLQ E.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months BRAIDWOOD - UNITS 1 & 2 3.8.4 - 2 Amendment

' DC Sources-Operating 3.8.4

~

I SURVEILLANCE REQUIREMENTS l

SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is 7 days a 127.6 V on float charge.

SR 3.8.4.2 Verify no visible corrosion at battery 92 days terminals and connectors.

2 1 Verify battery connection resistance is s 1.5E-4 ohm for inter-cell connections, s 1.5E-4 ohm for inter-rack connections, s 1.5E-4 ohm for inter-tier connecti;ons, and s 1.5E-4 ohm for terminal connections.

SR 3.8.4.3 Verify battery cells, cell plates, and 18 months l

racks show no visual indication of physical damage or abnormal deterioration that could degrade battery performance.

SR 3.8.4.4 Remove visible terminal corrosion, verify 18 months battery cell to cell and terminal connections are clean and tight, and are l coated with anti-corrosion material.

SR 3.8.4.5 Verify battery connection resistance is 18 months s 1.5E-4 ohm for inter-cell connections, s 1.5E-4 ohm for inter-rack connections.

s 1.5E-4 ohm for inter-tier connections, and s 1.5E-4 ohm for terminal connections.

(continued) l-BRAIDWOOD - UNITS 1 & 2 3.8.4 - 3 Amendment

'. DC Sources-Operating 3.8.4 I

l SURVEILLANCE RE0VIREMENTS (continued) '

SURVEILLANCE FREQUENCY SR' 3.8.4.6 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 . I SR 3.8.4.7 NOTES-

1. The modified performance discharge 1 l

test in SR 3.8.4 8 may be performed in I lieu of the service test in SR 3.8.4.7.

2. }

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

l Verify battery capacity is adequate to 18 months l

)

supply, and maintain OPERABLE status, the j required emergency loads for the design duty cycle when subjected to a battery service test. I l

)

I (continued) )

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BRAIDWOOD - UNITS 1 & 2 3.8.4 - 4 Amendment j

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DC Sources -Operating 4 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.8 -

--NOTE -

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

~- l l Verify. battery capacity'is a 80% of the 60 months l manufacturer's rating when subjected to a performance discharge test or a modified AND

" performance discharge test. l 12 months when l battery shows I degradation or has reached 85%

of the expected life with l

' capacity < 100%

of manufacturer's rating AND ,

i 24 months when !

battery has l reached 85% of <

the expected life with capacity a 100%

of manufacturer's rating F

I BRAIDWOOD - UNITS 1 & 2 3.8.4 - 5 Amendment i

l

p-DC Sources-Shutdown I 3.8.5 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC' Sources -Shutdown

.LC0 3.8.5 The following shall be OPERABLE: l

~

1

a. One DC electrical power subsystem capable of supplying one division of the onsite Class 1E DC electrical power distribution subsystem (s) required by LCO 3.8.10.

" Distribution System-Shutdown." with at least one unit crosstie breaker open: .and l

b. One source of DC electrical power other than that !

required by LC0 3.8.5.a capable of supplying the remaining onsite Class 1E DC electrical 3ower distribution subsystem (s) when required 3y LCO 3.8.10.

NOTE I One division may be crosstied to the opposite unit, when the l opposite _ unit is in MODE 1. 2. 3. or 4 with an inoperable battery charger.

APPLICABILITY: MODES 5 and 6.

During movement of irradiated. fuel assemblies. 1 ACTIONS NOTE-LC0_3.0.3 is not applicable CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required A.1 Declare affected Immediately DC electrical power required feature (s) subsystems ino3erable inoperable.

..for reasons ot1er than Condition B. @

(continued) l BRAIDWOOD - UNITS 1 & 2 3. 8.5 - 1 Amendment t -

l

, 1 DC Sources-Shutdown 3.8.5 ACTIONS (continued)

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 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 200 amps. l l defueled. '

AND B.2 Open at least one 7 days crosstie breaker I

between the crosstied divisions.

- SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY l

SR 3.8.5.1 NOTE The following SRs are not required to be performed: SR 3.8.4.6. SR 3.8.4.7. and

SR 3.8.4.8.

For DC sources required to be OPERABLE. the In accordance l following SRs are applicable: with applicable SRs l SR 3.8.4.1 SR 3.8.4.5 l

' SR 3.8.4.2 SR 3.8.4.6 SR 3.8.4.3 SR 3.8.4.7 SR 3.8.4.4 SR 3.8.4.8.

BRAIDWOOD - UNITS 1 & 2' 3. 8. 5 - 3 Amendment I -

Battery Cell Parameters 3.8.6 Table 3.8.6 1 (page 1 of 1)

Battery Cell Parameters Requirements l

CATEGORY A: CATEGORY B: CATEGORY C:

LIMITS FOR EACH LIMITS FOR EACH CONNECTED ALLOWABLE LIMITS FOR EACH PARAMETER DESIGNATED PILOT CELL CELL CONNECTED CELL Electrolyte Level > Minimum level > Minimum level Above too of plates, and Indication mark, and s k indication mark. and s k not overflowing inch above maxt g level inch above max 1 g level indication mark indication mark Float Voltage = 2.13 V = 2,13 VID3 > 2.07 V

{-

W Specific Gravity (c)(d) = 1.200 = 1.195 Not more than 0.020 below f average of all connected AND cells Average of all connected A_N,0 cells > 1.205 Average of all connected cells = 1.195 (a) It is acceptable for the electrolyte level to temporarily increase above the specified maximm during equ lizing charges provided it is not overflowing.

(b) Corrected for average electrolyte temperature, (c) Corrected for electrolyte temperature.

(d) A battery charging current of < 3 amps when on float charge is acceptable for meeting specific gravity limits following a battery recharge. for a maxim s of 7 days. When charging current is used to sattsfy specific gravity requirements, spectftc gravity of each connected cell shall be measured prior to expiration of the 7 day allowance.

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i BRAIDWOOD - UNITS 1 & 2 3. 8. 6 - 4 Amendment

Distribution Systems-Operating 3.8.9 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One AC electrical A.1 Restore AC electrical 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months power distribution power distribution subsystem inoperable. subsystem to OPERABLE AND status.

16 hours1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months from discovery of failure to meet l

LCO B. One AC instrument bus B.1 Restore AC instrument 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months electrical power bus electrical power distribution subsystem distribution AND inoperable. subsystem to OPERABLE status. 16 hours1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months from discovery of failure to meet LC0 C. One DC electrical C.1 Restore DC electrical 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months power distribution power distribution subsystem inoperable, subsystem to OPERABLE AND

{

status.

16 hours1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months from discovery of failure to meet LC0 D. Required Action and D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months 4

associated Completion ,

Time of Condition A. AND B. or C not met. '

D.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months (continued) l BRAIDWOOD - UNITS 1 & 2 3.8.9 - 2 Amendment

l

, l Distribution Systems-Operating 3.8.9 j l

ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME E. Two electrical power E.1 Enter LC0 3.0.3. Immediately distribution subsystems inoperable that result in a loss of safety function.

4 I

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.9.1 Verify correct breaker alignments and 7 days voltage to AC. DC, and AC instrument bus electrical power distribution subsystems.

I

-BRAIDWOOD - UNITS 1 & 2 3.8.9 - 3 Amendment

DC Sources-Operating B 3.8.4 BASES BACKGROUND (continued)

The DC power distribution system is described in more detail in Bases for LC0 3.8.9. " Distribution System-Operating."

and LC0 3.8.10. " Distribution Systems -Shutdown. "

Each battery was sized based upon supplying the design duty 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 battery has a nominal rating of 2320 ampere-hours at the 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months discharge rate to an end voltage of 1.75 volts per cell and was sized based upon continuously carrying the various estimated loads. The batteries were sized in accordance with IEEE-485-1983 (Ref. 5).

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 redundant Class 1E subsystems, such as batteries, battery chargers, or distribution panels. While it is possible to 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 a DC source.

i BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 2 Revision

I ,

DC Sources -Operating B 3.8.4 I BASES BACKGROUND (continued) 3 The crosstie between 125 VDC ESF buses 111 and 211 and the crosstie between 125 VDC ESF buses 112 and 212 are each I provided with two normally locked open, manually operated 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 to 200 amps based on not exceeding the OPERABLE battery capacity. These l

controls ensure that combinations of maintenance and test l operations will not preclude the system capabilities to supply power to the ESF DC loads. The provisions of administratively controlled, manually actuated, interconnections between the non-redundant Class 1E DC buses l

increases the overall reliability and availability of the DC systems for each unit in that it 3rovides a means for manually providing power to a DC aus 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 o]eration, while at the same time l

maintaining its battery Jank fully charged. Each battery I charger also has sufficient capacity to restore the battery from the design minimum charge to its fully charged state within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months while supplying normal steady state loads discussed in the UFSAR Chapter 8 (Ref. 4).

1 BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 3 Revision

DC Sources-Operating B3SA BASES ACTIONS (20ntinued)

C.1 and C.2 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 (i.e., battery or battery charger). '

1 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 recuired to supply all loads on the shutdown unit's crosstiec bus should an event occur on the shutdown unit. Therefore, Required Action C.1 specifies that the possible loading on the shutdown unit's DC bus be verified to be s 200 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Limiting the load to 200 amps, ensures that the operating unit's DC subsystem will n';t 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 has an inoperable battery.

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

BRAIDWOOD - UNITS 1 & 2 B 3.8,4 - 7 Revision

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q DC Sources-Operating

, B 3.8.4 BASES ACTIONS (continued)

D.1 f Condition D represents one division with a loss of ability I to completely respond to an event, and a potential loss of ability for the DC division to remain energized during normal operation. It is, therefore, imperative that the operator's attention focus on stabilizing the unit, minimizing the potential for complete loss of DC power to the affected division. The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months limit is consistent with the allowed time for an inoperable DC distribution system division.

If one of the re inoperable (e.g., quired DC electrical inoperable battery or power one DCsubsystems division is crosstied to the op)osite-unit DC division that does not have an inoperable aattery charger) the remaining DC electrical power subsystem has the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent worst case single failure would, however, result in the complete loss of the remaining 125 VDC electrical power subsystems with attendant loss of ESF functions, continued power operation should not exceed 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months Completion Time is based on Regulatory Guide 1.93 (Ref. 8) and reflects a reasonable time to assess unit status as a function of the inoperable DC electrical power subsystem and if the DC electrical power subsystem is not' restored to OPERABLE status, to prepare to effect an orderly and safe unit shutdown.

l E 1 and E.2

[

If the inoperable DC electrical power subsystem cannot be restored to OPERABLE status, or the crosstie breaker (s) cannot be opened, within the required Com)letion Time, the unit must be brought to a MODE in which tie LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and to MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable.

based on operating experience, to reach the recuired unit conditions from full power conditions in an orcerly manner ',

and without challenging plant systems. The Completion Time to bring the unit to MODE 5 is consistent with the time required in Regulatory Guide 1.93 (Ref. 8).

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 8 Revision L _ _ _ - _ - - - - - - -

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DC Sources-Operating '

B 3.8.4 BASES j

SURVEILLANCE SR 3.8.4.1

)

REQUIREMENTS i Verifying battery terminal voltage while on float charge helps to ensure the effectiveness of the charging system and the ability of the batteries to perform their intended j function. Float charge is the condition in which the charger is supplying the connected loads and the continuous charge required to overcome the internal losses of a battery ;

and maintain.the battery in a fully charged state. The voltage requirements are based on the nominal design voltage

' of the battery and are consistent with the initial voltages assumed in the battery sizing calculations. The 7 day Frequency is consistent with manufacturer recommendations and IEEE-450 (Ref. 9).

SR 3.8.4.2 Visual inspection to detect corrosion of the battery cells and connections', or measurement of the resistance of each intercell, interrack, intertier, and terminal connection, provides an indication of physical damage or abnormal deterioration that could potentially degrade battery performance.

The limits established for this SR must not be above the ceiling value established by the manufacturer.

Connection resistance is obtained by subtracting the normal resistance of the interrack (cross room rack) connector or the intertier (bi-level rack) connector from the measured intercell (cell-to-cell) connection resistance.

The Surveillance Frequency for these inspections, which can detect conditions that can cause power losses due to resistance heating. is 92 days. This Frequency is considered acceptable based on operating experience related to detecting corrosion trends.

B 3.8.4 - 9 BRAIDWOOD - UNITS 1 6 2 Revision 1

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g DC Sources-Ope ating L' 3.8.4 BASES SURVEILLANCE REQUIREMENTS (continued)

SR 3.8.4.3 Visual inspection of the battery cells, cell plates, and battery racks provides an indication of physical damage or abnormal deterioration that could potentially degrade battery performance. The presence of physical damage or deterioration does not necessarily represent a failure of this SR, provided an evaluation determines that the physical damage or deterioration does not affect the OPERABILITY of I the battery (its ability to perform its design function).

SR 3.8.4.4 and SR 3.8.4.5

{

i Visual inspection and resistance measurements of intercell, '

interrack, intertier, and terminal connections provide an indication of physical damage or abnormal deterioration that could indicate degraded battery condition. The anticorrosion material is used to help ensure good ,

electrical connections and to reduce terminal deterioration. 1 The visual inspection for corrosion is not intended to require removal of and inspection under each tern inal connection. The removal of visible corrosion is a preventive maintenance SR. The presence of visible corrosion does not necessarily represent a failure of this SR provided visible corrosion is removed during performance of SR 3.0.4.4.

The connection resistance limits for SR 3.8.4.5 shall not be above the ceiling value established by the manufacturer.

Connection resistance is obtained by subtracting the normal resistance of the interrack (cross room rack) connector or the intertier (bi-level rack) connector from the measured intercell (cell-to-cell) connection resistance.

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 10 Revision

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'. DC Sourdes-Operating B 3.8.4

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BASES j

i SURVEILLANCE REQUIREMENTS (continued) i i

SR 3.8.4.6 '

This SR requires that each battery. charger be capable of .

supplying 400 amps and 125 V for = 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . -These f

requirements are based on the design capacity of the '

chargers (Ref. 4). According to Regulatory Guide 1.32 (Ref. 10), the battery charger output capacity is required ,

to be based on the largest combined demands of the various steady state loads and the charging demands to restore the J 1

battery from the design minimum charge state to the fully I charged state, irrespective of the status of the unit during these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied.

The Surveillance Frequency is acceptable, given the unit conditions required to perform the test and the other administrative controls existing to ensure adequate charger performance during these 18 month intervals. In addition, this Frequency is intended to be consistent with expected fuel cycle lengths.

This Surveillance is required to be performed during MODES 5 l and 6 since it would require the DC electrical power i subsystem to be inoperable during performance of the test.

SR 3.8.4.7 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 design duty cycle requirements as specified in Reference 4.

i The Surveillance Frequency of 18 months is consistent with the recommendations 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 operations or at some other outage, with intervals between tests. not to exceed 18 months.

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

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 11 Revision

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DC Sources-Operating B 3.8.4 BASES

-SURVEILLANCE REQUIREMENTS (continued) l l

i 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 envelop the duty cycle of the service test. Since the ampere-hours removed by a rated 1 one minute 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 j 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.

A modified performance discharge test is a test of the battery capacity and its ability to provide a high rate, short duration load (usually the higlest rate of the duty cycle). This will often confirm the battery's ability to l meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test i

should be identical to those specified for a service test

! and the test discharge rate must envelop the duty cycle of the service test if the modified performance discharge test ,

l is performed in lieu of a service test. l I

l l The reason for Note 2 is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems. ,

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'l BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 12 Revision

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, DC Sources - Operatina !

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! BASES SURVEILLANCE REQUIREMENTS (continued) 1 SR 3.8.4.8 A battery performance discharge test is a test of constant current capacity of a battery, normally done in the as found condition. after having been in service. to detect any change in the capacity determined by the acceptance test.

l The test is intended to determine overall battery i degradation due to age and usage.

1 A battery modified performance discharge test is described in the Bases for SR 3.8.4.7. Either the battery performance i discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.4.8. however, only the modified performance discharge test may be used to satisfy l

SR 3.8.4.8 while satisfying the requirements of SR 3.8.4.7 '

at the same time.

The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 9) and IEEE-485 (Ref. 5). These references recommend that the battery be replaced if its 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.

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 13 Revision

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^ DC Sources -Operating B 3.8.4 l

BASES SURVEILLANCE REQUIREMENTS (continued)

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 and capacity is

< 100% of the manufacturer's rating. the Surveillance Frequency is reduced to 12 months. However. if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity a 100% of the manufacturer's rating. 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 > 10% below the manufacturer's rating. These Frequencies are consistent with the recommendations in IEEE-450 (Ref. 9).

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

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

2. Regulatory Guide 1.6. March 10.1971.

3. IEEE-308-1978.

4. UFSAR. Section 8.3.2.1.

5. IEEE-485-1983. June 1983.

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.

BRAIDWOOD - UNITS 1 & 2 B 3.8.4 - 14 Revision

DC Sources-Shutdown B 3.8.5 BASES

-LC0 The DC electrical-power subsystems with:

a. at least one subsystem consisting of its associated battery and battery charger and at least one of the associated crosstie breakers open to maintain !

independence between the units:

b. when 'the redundant division of the Class 1E DC .

electrical power distribution subsystem is required by I LC0 3.8.10. the other subsystem consisting of a battery, a charger, or crosstied to the opposite unit:

and

c. the corresponding control equipment, and interconnecting cabling within the division (s) are required to be OPERABLE to support the required l division (s) of the distribution systems required OPERABLE by LC0 :3.8.10. " Distribution Systems - Shutdown. " This ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of postulated events during shutdown (e.g.,

fuel handling accidents). I LC0 3.8.5.b allows the option to use a battery, a charger, or the crossties to the opposite unit's associated DC bus to maintain power to the redundant Class 1E DC electrical power distribution subsystem (s) when required by LCO 3.'8.10. This provision accommodates the required maintenance and/or testing of the shutdown unit's DC electrical power distribution subsystem (s) and continues to maintain the required redundant equipment OPERABLE.

LCO 3.8.5 is modified by a Note which allows one division to be crosstied to the opposite unit, when the opposite unit is in MODE 1. 2, 3. or 4 with an inoperable charger. No load restrictions are placed on the bus lenhng, when the one division is crosstied.

I BRAIDWOOD - UNITS 1 & 2 B 3.8.5 - 2 Revision 1

+, DC Sources-Shutaown B 3.8.0 1

BASES-i

' ACTIONS (continued) 1 j

B.1 and B.2 l j

Condition B addresses a shutdown 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 also shutdown. This provision is included to accommodate maintenance and/or' testing of the opposite unit's DC subsystems.

With the opposite unit's battery inoperable. the !

unit-specific DC subsystem will be recuired to supply all l loads on the opposite unit's crosstiec bus should an event I occur on the opposite unit. Therefore Required Action B.1 specifies that the possible loading on the opposite unit's DC bus be verified to be s 200 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . J Limiting the load to 200' amps. ensures that the unit-specific DC subsystem will not be overloaded in the

-event of a concurrent event on the unit. Required ,

Action B.1. is modified by a Note requiring Required l Action B.1 when the opposite unit has an inoperable battery.

Required Action B.2 recuires the associated crosstie breaker '

to be opened within 7 cays ensures that measures are being taken t.o reestablish independence of the DC subsystems.

SURVEItL'ANCE SR 3.8.5.1

REQUIREMENTS l

SR 3.8.5.1 requires application of all Surveillances l required by SR 3.8.4.1 through SR 3.8.4.8. Therefore, see the corresponding Bases for LC0 3.8.4 for a discussion of each SR.

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 Dower 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.

BRAIDWOOD - UNITS 1 & 2 B 3.8.5 - 5 Revision

', Battery Cell Parameters B 3.8.6 j 1

BASES SURVEILLANCE REQUIREMENTS (continued)

Table 3.8.6-1 This table delineates the limits on electrolyte level. float voltage, and saecific gravity for three different categories. T1e meaning of each category is discussed below.

Category A defines the normal Jarameter limit for each !

designated pilot cell in each 3attery. The cells selected I as pilot cells are those whose temperature, voltage, and electrolyte specific gravity approximate the state of charge of the entire battery. l The Category A limits specified for electrolyte level are based on manufacturer recommendations and are consistent i

~

uidance in IEEE-450 (Ref. 3). with the extra '

withthekowanceabovethehighwaterlevelindicationfor k inch al operating margin to account for temperatures and charge !

effects. In addition to this allowance, footnote (a) to Table 3.8.6-1 permits the electrolyte level to be above the i 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 Category A limit specified for float voltage is a 2.13 V per cell. This value is based on the recommendations of IEEE-450 (Ref. 3), which states that prolonged operation of cells < 213 V can reduce the life expectancy of cells. l The Category A limit specified for s)ecific gravity for each pilot cell is a 1.200 (0.015 below t1e manufacturer fully I charged nominal specific gravity or a battery charging current that had stabilized at a low value). 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).

BRAIDWOOD'- UNITS 1 & 2 B 3.8.6 - 5 Revision t

/, Battery Cell Parameters 1 B 3.8.6 BASES SURVEILLANCE REQUIREMENTS (continued)

The specific gravity readings are corrected for actual electrolyte temperature. For each 3 F (1.67 C) above 77 F i

(25 C). 1. point (0.001) is added to the reading: 1 point is subtracted for each 3 F below 77 F.

Category B defines the normal parameter limits for each connected cell. The term " connected cell" excludes any battery cell that may be jumpered out.

The Category B limits'specified for electrolyte level and float voltage are the same as those specified for Category A l and have been discussed above. Footnote (b) to l Table 3.8.6-1 requires the float voltage correction for average electrolyte temperature. The Category B limit specified for saecific gravity for each connected cell is ,

a 1.195 (0.020 3elow the manufacturer fully charged, nominal l l specific gravity) with the average of all connected cells I

> 1.205 (0.010 below the manufacturer fully charged, nominal l j specific gravity). These values are based on manufacturer's i recommendations. The minimum specific gravity value required for each cell ensures that the effects of a highly charged or newly installed cell will not mask overall degradation of the battery.

Category C defines the limits for each connected cell.

These values although reduced. provide assurance that ,

sufficient capacity exists to perform the intended function and maintain a margin of safety. When any battery parameter is outside the Category C limits, the assurance of sufficient capacity described above no longer exists and '

the battery must be declared inoperable.

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l BRAIDWOOD - UNITS 1 & 2 83.8.6-6 Revision 4

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+

,. Battery Cell Parameters B 3.8.6 BASES ~

SURVEILLANCE REQUIREMENTS (continued)

The Category C limits specified for electrolyte level (above the top of the plates and not overflowing) ensure that the plates suffer no physical damage and maintain adequate electron transfer capability. The Category C limits for float voltage is based on IEEE-450 (Ref. 3) which states that a cell voltage of 2.07 V or below, under float l conditions'and not caused by elevated temperature of the i

cell indicates internal cell problems and may require cell replacement.

The Category C limit of average specific gravity a 1.195 is l based on manufacturer recommendations (0.020 below the manufacturer recommended fully charged, nominal specific

gravity). In addition to that limit. it is required that the specific gravity for each connected cell must be no less than 0.020 below the average of all connected cells. This l

limit ensures that the effect of a highly charged or new cell does not mask overall degradation of the battery.

The footnotes to Table 3.8.6-1 are applicable to Category A.

B. and C s]ecific gravity. Footnote (c) to Table 3.8.6-1 requires t1e above mentioned correction for electrolyte temperature.

l 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 acceptable alternative to 53ecific gravity measurement for determining the state of c1arge. This phenomenon is discussed in IEEE-450 (Ref. 3).

Footnote (d) to Table 3.8.6-1 allows the float charge current to be used as an alternate to specific gravity for up to 7 days following a battery recharge. Within 7 days, q each connected cell's specific gravity must be measured to confirm the state of charge. Following a minor battery recharge (such as equalizing charge that does not follow a deep discharge) specific gravity gradients are not l

significant. and confirming measurements may be made in less l than 7 days.

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I BRAIDWOOD - UNITS 1 & 2 B 3.8.6 - 7 Revision i

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1 Distribution Systems-Operating B 3.8.9 s

BASES ACTIONS (continued) l-The second Completion Time for Required Action B.1 establishes a limit on the maximum allowed for any i-combination of required distribution subsystems to be inoperable during any single contiguous occurrence of failing to meet the LCO. If Condition B is entered while, l j

for instance. an AC bus is inoperable and . subsequently t returned OPERABLE, the LC0 may already have been not met for up to 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . This could lead to a total of 10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months . )

1 since initial failure of the LCO, to restore the instrument bus distribution system. At this time, an AC bus could s again become inoaerable, and inrtrument bus distribution l l restored OPERABLE. This could tontinue indefinitely.

This Completion Time allows for an exception to the normal

" time zero" for beginning the allowed outage time " clock."

l

' This will result in establishing the " time zero" at the time the LCO was initially not met, instead of the time Condition B was entered. The 16 hour1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months Completion Time is an acceptable limitation on this potential to fail to meet the ,

i LC0 indefinitely.

L1 i With one DC bus inoperable the remaining DC electrical power distribution subsystem is capable of supporting the minimum safety functions necessary to shut down the reactor i

and maintain it in a safe shutdown condition, assuming no single failure. The overall reliability is reduced.

however,_because a single failure in the remaining DC electrical power distribution subsystem could result in the '

minimum required ESF functions not being supported.

Therefore, the DC bus must be restored to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months by powering the bus from the associated battery or charger.

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BRAIDWOOD - UNITS 1 & 2 B 3.8.9 - 7 Revision

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" Distribution Systems -Operating B 3.8.9

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BASES ACTIONS (continued) 1 The second Completion Time for Required Action C.1 i establishes a limit on'the maximum time allowed for any combination of required distribution subsystems to be inoperable during any single contiguous occurrence of !

failing to meet the LCO. If Condition C is entered while.

for . instance.. an AC bus is inoperable and subsequently '

returned OPERABLE. the LC0 may already have been not met for up to 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . This could lead to a total of 10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months . I since initial failure of the LCO. to restore the DC l distribution system. At this time, an AC bus could again become inoperable, and DC distribution restored OPERABLE.

This could continue indefinitely.

This Completion Time allows for an exception to the normal

" time zero" for beginning the allowed outage time " clock."

This will result in establishing the " time zero" at the time the LC0 was initially not met, instead of the time Condition C was entered. The 16 hour1.851852e-4 days 0.00444 hours 2.645503e-5 weeks 6.088e-6 months Completion Time is an acceptable limitation on this potential to fail to meet the LCO indefinitely, D.1 and D.2 If the inoperable distribution subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and to MODE 5 within 1 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable. I based on operating experience, to reach the recuired unit conditions from full power conditions in an orcerly manner and without challenging plant systems.

El With two electrical power distribution subsystems inoperable that result in a loss of safety function, adequate core cooling, containment OPERABILITY and other vital functions for DBA mitigation would be compromised, and immediate plant shutdown in accordance with LCO 3.0.3 is required.

BRAIDWOOD - UNITS 1 &'2 83.8.9-9 Revision tl E

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_ Distribution Systems -Operating -

B 3.8.9

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BASES SURVEILLANCE SR 3.8.9.1 REQUIREMENTS This Surveillance verifies that the required AC. DC. and AC l instrument bus electrical. power distribution systems are functioning properly, with the correct circuit breaker alignment. The correct breaker alignment ensures the appropriate separation and independence of the electrical divisions is maintained, and the appropriate voltage is available to each required bus. The verification of proper voltage availability on the buses ensures that the required voltage is readily available for motive as well as control functions for critical system loads connected to these buses. The 7' day Frequency takes into account the redundant capability of the AC, DC. and AC instrument bus electrical power distribution subsystems, and other indications =

available in the control room that alert the operator to subsystem malfunctions. 1 REFERENCES 1. UFSAR. Chapter 6. I

2. 'UFSAR. Chapter 15.

3. Regulatory Guide 1.93. December 1974.

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a BRAIDWOOD UNITS 1 & 2 B 3.8.9 - 10 Revision i

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ATTACHMENT C Proposed Changes to Technical Specifications for Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2 i

INFORMATION SUPPORTING A FINDING OF NO SIGNIFICANT HAZARDS CONSIDERATION According to 10 CFR 50.92(c), a proposed amendment to an operating license involves no significant hazards consideration if operation of the facility in accordance with the proposed

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amendment would not:

(1) Involve a significant increase in the probability of occurrence or consequences of an accident previously evaluated; or (2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) Involve a significant reduction in a margin of safety.

1 Comed proposes to amend Appendix A, Technical Specifications (TS), of Facility Operating License Nos. NPF-37, NPF-66, NPF-72 and NPF-77 for Byron Station and Braidwood Station.

The proposed amendment corrects an oversight that occurred in Limiting Condition for l

Operation (LCO) 3.8.5 "DC Sources - Shutdown," during the implementation of the improved I Standard TS. This change removes the requirement from LCO 3.8.5 item b to have at least J

one cross-tie breaker open. The cross-tie breaker requirement will apply only to LCO 3.8.5 item i

a. This change clarifies that the source of DC electrical power required by LCO 3.8.5 item b for a Unit in Mode 5, Mode 6 or during the movement of irradiated fuel assemblies, may be cross-tied to the opposite Unit when required by LCO 3.8.10, " Distribution Systems - Shutdown." An administrative change to the Braidwood Station TS is also included to delete references to AT&T batteries in LCO 3.8.4, "DC Sources - Operating," LCO 3.8.5, "DC Sources - Shutdown,"

LCO 3.8.6, " Battery Cell Parameters," and LCO 3.8.9, " Distribution Systems - Operating," and to delete reference to the AOT extension granted under TS Amendment Number 99 since all s AT&T batteries have been replaced with Charter Power Systems. Inc. (C&D) batteries. !

Information supporting the determinatbn that the criteria set forth in 10 CFR 50.92 are met for this amendment request is provided below.

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i. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated? :

The proposed change will allow one DC bus on a shutdown unit to be supplied via the DC !

bus cross-tie to the opposite unit. The other DC bus on the shutdown unit will at all times I be required M be fully operable, supplied by the associated battery and charger, and the l associated cross-ties open. The DC electrical system is not considered an initiator of any I accident previously evaluated, and therefore the probability of a previously analyzed '

accident is unchanged.

l Page 1 of 3 Attachment C - Significant Hazards Consideration

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The consequences of a previously analyzed event are dependent on the initial conditions

. sssumed for the analysis, the availability and successful functioning of the equipment l assumed to operated in response to the analyzed event, and the setpoints at which these actions are initiated. Sufficient equipment remains available to mitigate the consequences of previously analyzed events. The Updated Final Safety Analysis Report (UFSAR) section 8.3.2.1.1 clearly allows operation.with the DC cross-tie closed on one DC bus between a unit that is operating and a unit that is shutdown, or between two shutdown units, in the manner proposed by this amendment. The TS in effect prior to the implementation of the l Improved TS also allowed operation in the manner proposed by th'is amendment. If DC l

buses are cross-tied due to an inoperable DC source on a shutdown unit, both the previous '

l TS and the change proposed by this amendment limit the time in this condition to seven days, and if the inoperable source is' a battery, the current on the cross-tie is limited to 200 amps. These actions protect both the operating unit, and the shutdown unit. If a shutdown j unit's DC bus is cross-tied to an operating unit's DC bus due to an inoperable charger on l the operating unit, both the previous TS and the change proposed by this amendment limit the time in this condition to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .- The limitations imposed by both the previous TS and j

,7 the change proposed by this amendment ensure that operation in this configuration is within j l the design bases of the plant. Thus the consequences of accidents previously analyzed are I l unchanged between the previous TS and the change proposed by this amendment. In the worst case scenario, assuming a single failure, one DC bus on the shutdown unit will always L , .be operable, and the ability to mitigate the consequences of any accident previously analyzed is preserved.

The change to delete all references in the Braidwood TS to AT&T batteries and the AOT extension granted under TS Amendment Number 99 is administrative only, and has no !

l impact on the probability or consequences of accidents previously evaluated. ,

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Therefore this proposed amendment does not involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does the proposed change create the possibility of a new or different kind of accident from any accident previously evaluated?

The proposed change does not involve a physical change to the plant. No new equipment is being introduced, and installed equipment is not being operated in a new or different

i. manner. There is no change being made to the parameters within which the plant is operated. There are no setpoints affected by this change at which protective or mitigative actions are initiated. This change will not alter the manner in which equipment operation is ;

initiated, nor will the function demands on credited equipment be changed. No a;teration in '

the procedures which ensure the plant remains within analyzed limits in being proposed,

l. and no change is being made to the procedures relied upon to respond to an off-normal l

event.: As such, no new failure modes are being introduced. The change does not alter _,

assumptions made in the safety analysis and licensing basis. Therefore, the change does <

.not create the possibility of a new or different kind of accident from any accident previously evaluated The change to delete all references in the Braidwood TS to AT&T batteries and the AOT extension granted under TS Amendment Number 99 is administrative only, and cannot create the possibility of a new or different kind of accident.

Page 2 of 3 Attachment C - Significant Hazards Consideration t t

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Therefore, the proposed changes do not create the possibility of a new or different kind of accident from any previously evaluated.

3. Does the proposed change involve a significant reduction in a margin of safety?

The margin of safety is established through equipment design, operating parameters, and the setpoints at which autom.atic actions are initiated. Sufficient equipment remains available to actuate upon demand for the purpose of mitigating an analyzed event. The proposed change, which will EUow one DC bus on a shutdown unit to be supplied via the DC bus cross-tie to the opposite unit, is acceptable because of the limitations imposed on operation in this configuration, and because the other DC bus on the shutdown unit will at all times be required to be fully operable, supplied by the associated battery and charger, and the associated cross-ties open. The TS in effect prior to the implementation of the improved TS allowed operation in the manner proposed by this amendment. In the worst case scenario, assuming a single failure, one DC bus on the shutdown unit will always be operable. Thus, there is no detrimentalimpact on any equipment design parameter, and the plant will still be required to operate within prescribed limits. Therefore, the change does not reduce the margin of safety, i

The change to delete all references in the Braidwood TS to AT&T batteries and the AOT !

extension granted under TS Amendment Number 99 is administrative only, and does not j reduce the margin of safety. '

Therefore, these changes do not involve a significant reduction in the margin of safety.

Page 3 of 3 Attachment C - Significant Hazards Consideration !

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ATTACHMENT D Proposed Changes to Technical Specifications for Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2 INFORMATION SUPPORTING AN ENVIRONMENTAL ASSESSMENT l

Comed has evaluated this proposed operating license amendment request against the criteria for identification of licensing and regulatory actions requiring environmental .

assessment in accordance with 10 CFR 51.21. Comed has determined that this proposed l license amendment request meets the criteria for a categorical exclusion set forth in 10 CFR 51.22(c)(9) and as such, has determined that no irreversible consequences exist in accordance with 10 CFR 50.92(b). This determination is based on the fact that this change is being proposed as an amendment to a license issued pursuant to 10 CFR 50 that changes a requkement with respect to installation or use of a facility compon'ont located within the restricted area, as defined in 10 CFR 20, or that changes an inspection or a surveillance requirement, and the amendment meets the following specific criteria.

(i) The amendment involves no significant hazards consideration.

As demonstrated in Attachment C, this proposed amendment does not involve any significant hazards consideration.

(ii) There is no significant change in the types or significant increase in the amounts of any effluent that may be released offsite.

The proposed change is limited to use of the DC cross-tie in a manner that is consistent with the design basis of the plant. This change does not allow for an increase in unit power level, does not increase the production, nor alter the flow path i or method of disposal of radioactive waste or byproducts. Therefore, the proposed change does not affect unit effluents.

(iii) There is no significant increase in individual or cumulative occupational radiation l exposure. I The proposed changes will not result in changes in the operation or configuration of the facility. There will be no change in the level <of controls or methodology used for processing of radioactive effluents or handling of solid radioactive waste, nor will the l proposal result in any change in the normal radiation levels within the plant. i Therefore, there will be no increase in individual or cumulative occupational radiation l exposure resulting from this change. l 1

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Page 1 of 1 Attachment D - Environmental l Assessment

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ML20209B741

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