Text

Proposed marked-up Tech Specs Re Dc Electrical Sources
	ML20236X048
Person / Time
Site:	Braidwood
Issue date:	12/03/1987
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML20236X045	List: ML20236X043; ML20236X048;
References
	NUDOCS 8712080389
	Download: ML20236X048 (8)
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PROPOSED CHANGES TO APPENDIX A ,

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78CHNICAL SPECIFICATIONS OF. ,

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l , ;. ..PACILITY OPRATING LICENSE NPP-72.

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ELECTRICAL POWER S',' STEMS, F . . .

3/4.8.2 D.C. SOURCES ~ 1 i

4 OPERATING' k

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' LIMITING /00NDITION FOR OPERATION ji

3. 8. N.1[ s a' minimum the following D.C. electrical. sources shall'be OPERABLE.

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a. 125-Volt D.C. Bus 111 fed from' Battery 111 for~ Unit 1 (Bus 211 fed from Battery 211 for Unit 2), and its. associated. full capacity charger .

and

b. 125-Volt D.C. Bus 112 fed from Battery 112 for Unit 1 (Bus 212 fed from Battery 212 for Unit 2), and its associated full capacity charger.

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

ACTION:

a. With one of the required battery banks and/or chargers. inoperable, restore the inoperable battery bank and/or battery bus to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least M0T STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months 'and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With the normal full capacity charger inoperable: 1) restore the affected battery and/or battery bus to operable status with the opposite units full capacity charger within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months , and 2) restore the normal full a t /Ch r to operable status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at ea t OT S ND n the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the followinq 3 aours.

I C . ( S e t. .In3e r t SURVEILLAf;CE REQUIREMENTS s - x - -- -

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

4.8.2.1.2 Each 125-volt battery bank and its associated charger shall be demonstrated OPERABLE:

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

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

2) The total battery terminal voltage is greater than or equal to 126 volts on float charge.

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. 111fandl211,?or busL112:and3212).shall be: limited.toLthe'._following: ,

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, y' m 4, (2)) With a D.C.Lbus. inoperable or!not energized on a' shutdown" unit r f(Mode 5'or 6),sthe affected D.C. bus may be1 energized from the;

An. A; operating unitj(Mode 1, 2'13 or 4). opposite D.Cf bus.via'the _l 7 ,

. crosstie breakers' af ter limiting l the' D.C. -loads on the affected .

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-D.C.! bus;Loperation may then continue for'up to ~1 days or open the.

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. ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS'(Continued)

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b. At least once per 92 days and within 7 days after a battery discharge i 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 connection resistance of these items is less than 150 x 10 8 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 i coated with anticorrosion material, ,

3) The resistance of each cell-to-cell and terminal connection is !

less than or equal to 150 x 10 8 ohm *, and

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

d. At least once per 18 months, during shutdown, by verifying that the battery capacity is adequate to supply and maintain in OPERABLE d status all of the actual or simulated emergency loads for 240 minutes when the battery is subject to a battery' service test;

e. At least once per 60' months, during shutdown, by verifying that the battery capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test. This performance discharge test may be performed in lieu of the battery service test required by Specification 4.8.2.1.2d.;

f. At least once per 18 months during shutdown, by giving performance discharge tests of battery capacity to any battery that shows signs of degradation or has reached 85% of the service life expected for the application. . Degradation is indicated when the battery capacity

{r,opsmorethan10%ofratedcapacityfromitsaverageonprevious perform'5iiceAeht helow 90% of the manufacturer's rating.

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I ta' d W Lubtrac14 N resistance of: 1) the cross room rack connector (400 x 10 6 ohm, typical) and 2) the bi-level rack connector (50 x 10 6 ohm, typical); from the measured cell-to-cell connection resistance.

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Atileast once per,12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months ',1when in: specification?. . . .

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~~v'. - fassociatedifull-capacity / charger?shallLbeiOPERAB~~

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~~h W APPLICABILITY:: iMODES 5jand 6.~~

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~~4With .thelrequired'batteryLbank and/or full-capacity charger inoperable,Timmet i I*'~~
Y,V (diately: suspend all'operationsyinvolving CORELALTERATIONS,f positive- reactivityJ '
WW .fchanges.orimovementcof' irradiated fuel;. initiate corrective action to restore f 4
T the. required. battery bank and. full-capacity chargerLto:0PERABLEistatus'as sooni '9 (4 i s:asipossible.iand withinL8; hours,;depressurize?and vent the Reactor:Coolante '
l i, i 4aSystem;through Tat: leastLa" 2 ls.quare . inch vent.
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1 SURVEILLANCE' REQUIREMENTS:
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4 J : [4,8.2.2NTheaboverequired125-voltD.C.l bus fed from'its battery:and'its' s
Lassociated charger shall:be demonstrated 0PERABLE per Specifications 4.8.2.1.1-
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~~SUMMARY~~
OF PROPOSED CHANGE .r F I 7 e, j
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This proposed amendment modifies the.D.C.1 system technical- .
W Specifications toLaddressl operation of;the'D'.Cf crosstie between units for , ,
~~- the1following two situations:~~
withbothunitsoperating.andonebatterychargerfails,theD.C.
. crosstie may'be used, for up to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , to maintain the D.C.' bus in'an o * "
~~.. operable status while the-battery charger is being. repaired.- :-~~
'iWith one unit operating and/the other unit shut'down with'al battery and:'
'its associated battery charger out of_ service..the D.C. Crosstie'may.be'
, . .used.for up to 'l days,1to maintain.the D.C.' bus inlan operable' status'.
Calculations.have been performed to justify use of the D.C.-
F L crosstie lforithe two situations discussed above..-For~the firstcsituation,
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Leach battery will be' connected to its bus. One' battery charger will serve' both buses. ' As a result',: use of. the D.C. crosstie will- not. exceed the -
,.o idesignl parameters lof'the D.C. system.
. 1 For the second situation, the battery charger and battery of the
~
l operable D.C.. bus lwill' supply both buses. .In th s i case, the D.C.-crosstie.
load will be limited'to 63 amps (per, proposed surveillance-requirement 4.8.2.1?.3)isince:a battery does not*have sufficient capacity to supply the '
, design load' cycle forlboth D.C. buses.
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EVAU mTION OF SIGNIFICANT HAZARDS CONSID_ERATIONS
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Hl -Commonwealth Edison has evaluated this proposed amendment and' determined that,it' involves no.significant hazards considerations.
According to'10 CPR 50.92(c),-a' proposed amendment to.an' operating license.
involves no significant hazards considerations if operation of the_tacility.
l in accordance with the proposed amendment would not:.
(1).' Involve a~significant increase.in the probability or consequences
~of.an accident'previously evaluated; or
.(2) Create the possibility ofLa new or different kind of accident.from
, , any accident'previously evaluated; or ;
> (3) Involve,a significant reduction-in.a margin of safety.
'This' proposed amendment controls the use of the'D.C. crosstie between opposite unit D.C. buses. Accidents previously evaluated assume a certain load profile on a D.C. bus. .The D.C. bus loading, when using the crosstie, will be restricted so the capacity of the operating unit's battery will not be exceeded in the event of a single failure.and simultaneous
~a ccidentiand loss of offsite power conditions. A single failure and simultaneous accident and loss of-offisite power are the conditions assumed u for a'D.C. bts in previously evaluated accidents. As.a result, the-E probability or consequences of accidents previously evaluated are not changed by this proposed amendment.
. The only new or different kind of accident which could be created by this proposed amendment would involve an interaction between the two D.C.
buses which are crosstied. However, a breaker exists on either side of the crosstie which would isolate any potential short circuit from either unit.
These breakers are coordinated with the D.C. bus main breaker to assure the crosstie will isolate from the affected D.C. bus before the battery would be
~
isolated. All of these breakers'are Class 1E. For these reasons, a new or different kind of accident will not be created from this proposed amendment.
This proposed amendment will allow use of-some margin in the capacity of the batteries which was allocated for future D.C. loads.
However, no design margin in the batteries (i.e., aging or temperature correction factors) has been affected by this proposed amendment.
Accordingly, no margin of safety has been reduced.
Based on the preceeding assessment, Commonwealth Edison believes this proposed amendment involves no significant hazards considerations.
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ML20236X048

Text

SUMMARY

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