ML20198L881

Proposed Tech Specs Pages,Revising TS Section 3/4.8.2 & Bases,To Allow Replacement of 125 Volt Dc At&T Batteries W/New Charter Power Sys,Inc (C&D) Batteries

ML20198L881
Person / Time
Site:	Braidwood
Issue date:	01/14/1998
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20198L875	List: ML20198L870 ML20198L881
References
NUDOCS 9801160141
Download: ML20198L881 (11)

Text

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i ATTACHMENT B  ;

MARKED UP PAGES FOR. ,

PROPOSED CilANGES TO APPENDIX A TECIINICAL SPECIF! CATIONS OF ,

FACILITY OPERAT!NG LICENSES NPF-72 AND NPF CURRENT TECHNICAL SPECIFICATIONS REVISED PAGES:

-3/4 8-10 3/4 8-11 3/4 8-11a 3/4 8-12a' 3/4 8-13 B 3/4 8-2 l

j 9901160141 990114 '

POR ADOCK 05000456?

P PDR '

ELECTRICAL POWER SYSTEMS 3/4.8.2 0.C. SOURCES OPEDATING l

LIMITING CONDITION FOR OPERATION

\

3.5.2.1 As a minimum the following 04 electrical sources shall be OPERABLE:

a. 125-Volt D.C. Bus 111 fed frcm Battery 111 for Unit 1 (Bus 211 fed from Battery 211 for Unit 2) and its associated full capacity charger, and with l one of its associated crosstie breakers in the open position, and i 125-Volt D.C. Bus 112 fed from Battery 112 for Unit 1 (Bus 212 fed from l

b. '

Battery 212 for Unit 2) and its associated full capacity charger, and with one of its associated crosstie breskers in the open position.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With one of the required 125-Volt D.C. buses inoperable due to its normal associated full capacity charger being inoperable, operations may continue provided that within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> the inoperable bus and its associated battery are energized by the opposite unit's 125-Volt D.C. bus and its OPERABLE charger via the crosstie breakers and that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the inoperable bus and its charger are restored to OPERABLE status. Otherwise be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b. With both of the crosstie breakers closed for a 125-Volt D.C. bus that is required to be OPERABLE and with both units operating (Modes 1, 2, 3, or

4) the 125-Volt D.C. bus nay energize the opposite unit's inoperable 125-Voit 0.C. bus having an inoperable charger without a load restriction,

c. With both of the crosstie breakers closed for a 125-Volt D.C. bus that is required to be OPERABLE and with the opposite unit shutdown (Modes 5, 6, or defueled), the crosstie breakers may remain cicsed for up to 7 days provided items 1 and 2 below are satisfied. Otherwise open one of the crosstie breakers.

(1) The shutdown unit's bus load Operating Unitis restricted Load to:

Shutdown Unit Battery Status Battery Tvoe Restriction Inoperable AT&T 100 Amps Inoperable _ "M C (D 2ic - @ Amps OPEMBLE Either None (2) If a load restriction applies then once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> verify that the shutdown unit's bus loading will not exceed the load restriction.

d. With one of the required 125-Volt D.C. buses inoperable, except for the allowances of ACTIONS (a), (b), or (c) above, restore the inoperable bus to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE RE0VIREMENTS 4.8.2.1.1 Each D.C. bus shall be determined OPERABLE and enercized from its battery at least once per 7 days by verifying correct breaker alignment.

3/4 8-10 AMENDMENT NO. 47 BRAIDWOOD - UNITS 1 & 2

. ELEETRICAL PoisER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 4.8.2.1.2 Eat.h 125-volt battery bank and its associated charger shall be demonstrated OPERABl.E:

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

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

2) The 130.5total battery)-M+

volts (AT&T terminal voltage volts (4ewW) 82.7. f, C4P onisfloat greater charge.than or equal to l

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

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

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

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

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

1)

The cells, cell plates, and battery racks show no visual indication of physical damage or abnormal deterioration, 2)

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

3) The resistance less than of to or equal each150cell-to-fell x 10' ohmand terminal connection is

• , and

4) The tattery charger will supply a load equal to the manuf acturer's rating for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

d. At least once per 18 months, during shutdown, oy verifying that the is adequate to supply and maintain in OPERABLE battery status all of t actual or simulated emergency loads for the design capacit[e duty cycle when.the battery is subject to a battery service test:

• 0btained by subtracting the norma,1 resistance of: 1 the cross room rack r i cnantIlor_( M only: 400 x 10' 50ohn, typical) and )2?)the bi-level x 10 ohm, typicai ; from the measured rac

@c ector both AT&T_an W :

-to-ce 1 connection resistance.

3/4 8-11 AMEN 0 MENT NO. 47

'BRAIDWOOD - UNITS 1 & 2

ELECTRICAL POWER SYSTEMS SURVElttANCE REQUIREMENTS (Continued)

e. shutdown, by verifying that the

= At leastcapacity battery once peris60at months, least 95% during LAT &T) 80% 7^ 'd! of the

~10: ~ manuf acfiFrer's rating when subjected to a performance discharge test or a modified performance discharge test. The modifitd perfomance

~

i

' discharge test (AT.&4 and the perf ormance discharge test %eeM) may be performed in lieu of the battery service test required by Specification 4.8.2.1.7d.;

st a

f. A*. least once per 4& months' during shutdown, by giving performance j dischar e tests or modified performance discharge tests of battery 1 capacit to any battery that shows signs of degradation or has i reached 85% of the servica life expected for the application.  !

Degradation is indicated when the battery capacity drops more than 5%

(AT&T) 10% Ksee M) of rated capacity from its capacity on the previous performance test or modified performance test, or is below

{_t~i gjs 100% (AT&T) 90%

\ 9 (f 44) of the manufacturer's rating.

l Mdy GSY84 O' ^~ A 1*

• A'"%8- W4 A'- I'" ** PM' t% 69% A* Oc too *g d S.A ed c.9c c.ity, brAhg CAPAcih is 7 I

BRAIDWOOD - - UNITS 1 & 2 - 3/4 8-lla AMENDMENT NO. 47

TABLE 4.8-2 t~"l) D Le BATTERY SURVEILLANCE REOUIREMENTS CATEGORY A'" CATEGORY B'"

LIMITS FOR EACH ALLOWABLE'"

PARAMETER LIMITS FOR EACH VALUE FOR EACH DESIGNATED PILOT CONNECTED CELL CONNECTED CELL CELL

> Minimum level Above top of Electrolyte > Minimum level indication mark, plates, Level indication mark, and 5 t' above and not and 5 n' above overflowing maximum level maximum level indication mark indication mark 12.13 volts8 > 2.07 volts Float Voltage 2 2.13 volts Not more than 0.020 below

-the average of all connected

> 1.195 cells Specifi Gravity [4 2 1.200'D Aurage of all Average of all connected cells connected cells

> 1.205 1 1.195'D TABLE NOTATIONS the battery (1) For any Catesory A parameter (s) outside the limit (s) shown may be consicered OPERABLE provided that within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> all the Category B measurements are tcken and found to be within their allowable values, and provided all Category A and B parameter (s) are restored to within limits within the next 6 days (2) For any Category B parameter (s) outside the limit (s) shown, the battery may be consicered OPERABLE prov.ided that the Category 8 parameters are within their allowable values and provided tiie Category 8 parameter (s) are restored to within limits within 7 days.

(3) Any Category B parameter not within its allowable value indicates an inoperable battery.

Or battery charging current is less thanMm: ps when onCorrected for electrol charge.

Corrected for average electrolyte temperature 7. b c: >

C-AMENDMENT NO 47 BRAIDWOOD - UNITu I & 2 3/4 8-12a

ELECTRICAL POWER SYSTEMS 0;C. SOURCES SHUTDOWN L]MITING CONDITION FOR OPEPATION 3.8.2 2 As a minimum one 125-volt D.C. bus fed from its battery and its associatedfull-capacitychargerandr1*.honeofitsassociatedcrosstie breakers in the open position shall be OPERABLE.

APPLICABILITY: H0 DES 5 and 6. ,

ACTION:

a.- With both of the crosstie breakers closed for the 125-Volt D.C. bus that is required to be OPERABLE and with the opposite unit o bus may ene mize 2, 3, or 4?, the shutdown unit's operable 125-Volt D.C.perating (M the operat< ng unit's inoperable 125-Volt D.C. bus having an inoperable charger without a load restriction.

b. With both of the crosstie breakers closed for the 125-Volt D.C. bus that is required to be OPERABLE and with both units shutdown (Modes 5, 6. or

, the 125-Volt D.C. bus may energize the opposite unit's 125-Volt-defueled)for D.C. bus up to 7 days provided items 1 and 2 below are satisfied.

Otherwise : pen one of the crosstie breakers.

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

Opposite Bus Operable Bus Load Battery St,ttui Battery Tvoe Restriction 100 Amps Inoperable AT&T Inoperable M c4O roo e Amps Either None OPERABLE (2) If a load restriction applies then once per-12 hours verify _that the l oppositeshutdownunit'sbusloadingwillnotexceedtheload restriction.

c. With the required 125-Volt D.C. bus inoperable, except for the allowances above, immediately suspend all operations involving

, of ACTIONS (a)

CORE ALTERATIONS, pos or (b)itive reactivity additions, or movement of irradiated fuel; initiate corrective action to restore the required bus to OPERABLE l status as soon as possiDie; and within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, depressurize and vent the

' Reactor Coolant System through at least a 2 square inch vent.

SURVEILLANCE REOUIREMENTS L

4.8.2.2 The above required 125-volt D.C. bus fed from its battery and its associated charger shall be demonstrated OPERABLE per Specifications 4.8.2.1.1 l

and 4.8.2.1.2.

i

-AMENDMENT _NO. 47

'BRAIDWOOD'-_ UNITS 1 & 2- 3/4 8-13

ELECVRIC F0WER SYSTEMS '

BASES A.C. SOURCES. D.C. SOURCES. Un ON3f TE T'0WER DISTRIBUTION (Continued)

The Surveillance Re mirr 1t for demonstrating the CPERABILITY of the l station batteries is bin .ne reconnendations of Regulatory Guide 1.129,

" Maintenance Testing anc Replacement of Large Lead Storace Batteries for i Nucitar Power Plants," February 1978, and IEEE Std a50-1980, "IEEE Recommenced l Practice for Maintenance Testing, ar.d Replacement of Large Lead Storage l Batteries for Generating Stations and Substations."  !

The modified I ha:ge test is described in N ?" r., :99P

" **"! M :: t: $erformancEEE Std 450', "!EEE Reconnended Practice for Maiittenance, Testing and Replacement cf Vented Lead-Acid Batteries for Stationary Applications." It is permissi61e to perform a modified ps.lormance discharge l test on the=A M e battery in li,i o'l a service test and a performance discharge l test as required by Regulatory buide 1.129, Regul.nory Position C.1, because the test discharge rate envelopes the load cycle of the service test.

Verification of the crosstie loading lirits in Specifications 3.8.2.1 and 3.8.2.2 ensures that the OPERABLE battery will have sufficient capacity to energize the design basis loads of its DC bus while maintaining the limited DC loads of the innperable DC bus on a shutdown unit. .

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage on float charge, and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at tt.it time with the rated capacity.

as-The battery service test )s a special found to satisfy the design requirements (battery duty cycle of thetest of battery ca ability,D.C.

electrical power system. T.be discharge rate and length of th battery service test corresponds to the design duty cycle requirements as specified in UFSAR Subsectica 8.3.2.1.1.

Table 4.8-2 soecifies the normal limits for each designated pilot cell and each connected' cell for electrolyte level, float voltage and spGific gravity. The limits for the designated pilot cells float voltage and specific gravity, greater than 2.18 volts ( AT&T) 2.13 volts Woold) and 0.015 below the

/ manufacturer's full charge spRific gravity or a battery charger current that is characteristic of a charged cell with d4 7h had stabilized adequate at a low valueThe normai limits for each connected cell for float voltage capacity.

\ and specific gravity greater than 2.18 volts (AT&T) 2.13 volts @eneW) and not more than 0.020 below the manufacturer's full charge specific gravity with an average specific the manufacturer' s fullgravity charge of all thegravity, specific connected ensurescells not more thanand the OPERABILITY 0.010 below capability of the battery.

Operation with a battery cell's parameter outside the normal limit but within the allowable value specified in Table 4.8-2 is permitted for up to 7 days. During this 7-day period: (1) the allowable values for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capabilit of all the cells, y; (2) the allowable value for the average specific gravitynot more ensures that the decrease in rating will be less than the safety margin charge specific providegravity, the allowable d-inansizing; value fer an (3) individual individual cell's specific gr cell's specifir. gravity, ensures that will not be more than 0.040 below the mc.ufacturer's full charge specific gravity and thP. the overall capability of the be:tery will be maintained the allowable value for an individual within an acceptable cell's float voltage, greater limit; and than(4)2.14 volts (AT&TL 2,07 volts yd),

ensures the battery's capability to perform its des'gn function. g q c3 }

B 3/4 8-2 AMENDMENT NO. 47 BRAIDWOOD - UNITS 1 & 2

ATTACHMENT C EVALUATION OF SIGNIFICANT liAZARDS CONSIDER ATION FOR PROPOSED CIIANGES TO APPENDIX A TECIINICAL SPECIFICATIONS OF FACILITY OPERATING LICENSES NPF-72 AND NPF-77 Comed has evaluated the proposed amendment and determined that it involves no significant hazards considerations. According to 10 CFR 50.92(c), a proposed amendment to an operation i license involves no significant hazards consideration if operation of the facility in accordance with the proposed amendment would not:

1. Involve a significant increase in the probability of consequences of an accident "eviously 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.

The proposed changes allow fw the replacement of the 125 volt de AT&T batteries with new 125 volt de C&D batteries and revises the crosstic loading limitation.

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

The replacement C&D httery has been selected to meet or exceed the design, functional, and operational requirements of those of the present AT&T battery, including crosstie load limitations. The C&D batteries are similar in c'.esign to the previously .'nstalled Gould batteries (e.g. elecirolyte specific gravity and construction of the plates; except for capacity. The replacement C&D batteries have a significantly larger capacity than either the previously installed Gould, or the currently installed AT&T, batteries. This increased capacity can provide additional margin for future use.

Also, tne C&D batteries are qualified for a 20 year life and meet the latest applicable standards. The short circuit current provided by the C&D batteries is well within the interrupting capability of the existing DC system Circuit breakers.

Additionally, the crosstic limit is increased to take advantage of the larger C&D battery capacity. The C&D batteries were sized based on having sufficient capacity to energize the design basis DC loads of an operr, ting unit with the IEEE-485 design margin while I

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

Also, although adherence to the performance testing intervals stated in IEEE Std 450 could result in a planned shutdown and possible subsequent increase in the probability of occurrence of an accident (e.g. Turbine Trip), it would be part of a controlled and planned shutdown, therefore the increases would not be considered significant.

The overall design, function, and operation of the DC system and equipment has not been altered by these changes. The proposed changes do not affect any accident initiators of precursors and do not alter the design assumptions for the systems or <

components used to mitigate the consequences of an accident as analyzed in UFSAR Chapter 15. Therefore, there is no increase in the probability or consequences of an accident previously evaluated.

B. The proposed change does not create the possibility of a new or Merent kind of accident from any acci&nt previously evaluated.

The replacement C&D batteries will provide the same function as t'mse of the installed AT&T batteries and will be operated with the same types of operational controls.

These limite include battery float terminal voltage, individual cell vo ltage and electrolyte specific gravity, and crosstic loading. Crosstic conditions are allowed under the present Technical Specifications. The crosstie limit is increased to take advantage of the larger C&D battery capacity. The remaining changes are administrative in nature or provide clarification to maintain consistency with other Technical Specifications.

The DC system and its equipment will continue to perform the same function and be operated in the same fashion. The proposed changes do not create any new or common failure modes. The proposed changes do not introduce any new accident initiators or precursors, or any new design assumptions for the systems or components used to mitigate the consequences of an accident. Therefore, the possibility of a new or different kind of accident from any accident previously evaluated has not been created.

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

The replacement C&D batteries will meet or exceed the design, functional, and qualifications of the installed AT&T batteries.' The proposed Technical Specification ,

limitations for the C&D batteries are derived from the same methodology as the AT&T batteries with applied margins in accordance with IEEE 485. Increasing the crosstic i

loading limits takes advantage of the larger C&D battery capacity with its increased

! design margin. The proposed change to the crosstie loading limit will continue to conservatively envelope the postulated design requirements. The remaining changes are administrative in nature or provide clarification o maintain consistency with other Technical Specifications.

2-

i

.- The inherent design conservatism of the DC system and its equipment has not been altered. The DC system and its equipment will continue to be operated with the same degr' sf conservatism. Therefere, there is no reduction in the margin of safety. 1 I

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

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4 ATTACHMENT:D -

ENVIRONMENTAL ASSESJh'GNT FOR-  !

PROPObED CHANGES TO APPENDIX A TECilNICAL SPECIFICATIONS OF :

FACILITY OPERATING LICENSES NPF-72 AND NPF-77

~l Comed has evaluated the proposed amendment and determined that is meets the criteria for a categorical exclusion set forth in 10 CFR 51.22(c)(9). .This determination is based upon the fbilowing; The proposed amendment changes requirements regarding the installation and use of facility compenents located within the testricted area (as defined in 10 CFR 20) and  ;

surveillance requirements; and the proposed amendment involves no significant hazards considerations, no change in the amount or type of any effluent that may be released ofTsite, i and no increase in individual or cumulative cecupational radiation exposure. Pursuant to 10 -

CFR S t.22(b), neither an environmental impact statement nor an environmental assessment is necessary for the proposed amendment.

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