Text

DOP 6900-2,Revision 4, 125 Vdc Electrical Sys
	ML17174A580
Person / Time
Site:	Dresden
Issue date:	07/31/1979
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML17174A578	List: ML17174A577; ML17174A579; ML17174A580; ML17174A581; ML17174A582; ML17174A584; ML17174A585; ML17174A590; ML20062K353;
References
	6900-2, NUDOCS 8012160522
	Download: ML17174A580 (5)
	v • d • e

125 VDC ELECTRICAL SYSTEM

DOP 6900...;.2 Revision 4

.July 1979 A.

PU~POSE The purpose o{ th:f.s procc*!ui*e i.s to* out line the method used to

pJ:":e the battery c.hargcr fn :;ervi.ce*, opet.*;1te i.t norrn:1lly,

. tc:l;lSfL~rcing to an <1lter11;1tc f*tlWCr

~>01lt:"Ce; and removing the h;.1ttery chare1~r frolil service on the 125 VDC. electrical system *.

B.

HEFf'~RENCES

1.

None.

C.

PREREQUISiTES

1.

None.

D'..

PRECAUTIONS

1.

None.

E._

LIMITATIONS AND ACTIONS

1 *.

From and after the date that one of the two 125/250 VDC

. battery systems is mad*e o.r found to be inoperable (or any *.

0 reaso.n, continued reactor operation is permissible only during the succeedin~ seven days unless such battery syste~

is sooner made operable.

F.

PROCEDURE

1.

Placing the charger in service.

a.

CLOSE the 480 VAC supply breaker at MCC 29-2 (MCC 39~2) for the unit charger and MCC 28-2 (MCC 38-2) for the..

reserve chargers.

b.

CLOSE the A.C. breaker at the charger cabinet.

c.

CLOSE the D.C. breaker at the charger breaker.

d.

CLOSE the D.C. breaker charger to battery bus 2(3) at 125 VDC turbine building Main Bus 2(3).

2.

Normal operation.

3.

a.

The charger control will be in the FLOAT mode.

Verify the battery voltage is being maintained and the charger is at 130.2 volts.

Float mode is obtained by turning*

the timer dial on the battery charger to "float".

EQUALIZE mode.

____ s_o_1.21 6 o~>'1" APPROVED SEPl l '79

""'~

1 n 0 c Q_

DOP 6900:,..2 Revision 4

a.

Equalizing battery *.

(1)

Verify that the electrolyte levels in the cells ate between the low level nnd high level markers.

Fill with water if I~~.

Avoid ~pilling water on top of c1~1.1s.

If :my i.s spilled, wipe it dry to avoid shorting ~ells.

(2)

Turn dial on h."ttery charger to 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months equalize.

(3)

The charger shci~ld rnad 135 volts. during the equalize charge.

(4)

Battery is to be equalized* for at least 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

(5)

Give the dine of start of equalizing charge to the Shift Engineer so he can record it and pass it on to.the following shifts.

(6)

Verify periodically the electrolyte levels.

(7)

When charging current has tapered and stabil iz_ed *

(no further rcdu~iion for 3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months ), continue charging until there is no further increase in the lowest cell voltage.

Perform this by doing

~he following at the end cf the 66th, 67th, 68th, 69th, 70~h, 7lst and 72nd ~our~:

{a)

With a voltmeter, fir:id the lowest cell vo~tage.

and record on Attach~ent A.

{b)

Read the charging current off the battery

charg¢r and record. on Att.achment *A.

(8) If no changes in the reading.s are noted, termin~te equalization.

If there is a change, continue steps in 3.a.(7) until no change is found.

(a) Terminate equalizing by turning equalizing*

timer dial to zero*

b.

Place the charger in.the EQUALIZE mode for the conditions listed below._.

(1). The temperature corrected cell is* less than 1. 205~

charge value).

2 specific gravity of.any (10 points below full APPROVE.D SEPl l '79 n_o~s.R.

DOP 6900-2 Revision 4*

(2)

When :my cP.11 h:1s :1 volt.1ge less than 2.13 volts.*

(.04 volts bclo~ nominal voltage of 2.17 volts).

(3)

When, the :h;1ttcry h:1s rcce:lvcd ;10 r.1ncq~ency dh;charge*

l<'sting 15 inint1t*:s or m1n*e *.

(4)

Before a hat t*cry lli::;ch.:H:ge test.

(5)

Honthly, r*~s:ir.dlcss *.)f the conrlitions outlined above.

4.

Tr<insfer of 125 VUC re;1c.tor bui.lding MCC to alternate source.

b.

Verify breaker E-2 (r.~:;crve Turbine Building 125. VDC ~tCC to Reactor Building 12SVDc-MCc)is-~pcn:-~mdtag it OUT-OF-SERVICE.

c.

Remove t~e co~pe~ links from their present location arid insert them in the alternate feed location.

d.

Remove the OUT-OF-SERVICE cards and CLOSE.the breaker *.E-2 (reserve Turbine building 125 VDC MCC to Reactor Building 125 MCC).

5.

Removing a charger from s~rvice~

a.

Verify another.charger is connected to the battery bus.

b.

OPEN the CHARGER TO BATTERY BUS breaker at the 125.

VDC turbine building Main Bus 2 (3.).

c.

OPEN the charger D.C. breaker.

d.

OPEN the charger A~C.* breaker.

e.

OPEN the charger supply breaker at the 480 VAC MCC (MCC 29-2 Chgr #2, MCC 39-2 Chgr 113, MCC. 28...,.2 Chgr #2A~

MCC 38-2 Chgr #3A).

£.

Rack out the breaker and place OUT~OF-SERVICE carcis as required.

APPROVED.

SEP! 1 '79 D.O.S.R.*

DOP 6900,-2 Rev{sfon 4

.6.

Transfer of turbine bi:1ilding reserve bus.*

a.

No1mally each units reserve bus is supplied by the other uriits main bus.

This provi.des reLi:ibi.Uty for co,*.trol *powcr.

If it bcto;oic:s 11:~c:1~ss::iry to transfer**

the power supply on a hus, the following *procedure will be used to erisut'e conti.nqi.ty of control power:

(l)

CLOSE the r11 i. t 2 (3) Rcsc1:ve Bus Feed from Unit 2(3) at t1ie Unit 2(3) Hain flus 2(3).

(2)

OPEN the !Jn i. t 3 (2) Hain Rns S11pply to Unit 2 (3)

R*~serve Bus at the Unit 3(7-) Main Bus 3(2).

G.

CHECKLISTS

1.

Checklist A.

H..

TECHNICAL SPEGIFICATION REFERENCES

1.

Section 3.9.

2.

Section 4.9.

. ~,.. - -----------

-~.

APPROVED SEPl 1 '79

-'..:\\

>*:.:3-I.

i

~evTslon4.

CH!:CKL I ST A

--~-------**----*--*-*;_**~------** -*-**--*-**-***..:..__ __

llOIJR _,

LO\\~EST CELL VOLTAG~

CHl\\RGI tlG CURRENT

---~----* -----_--------- -*--------*--

- --*--:----* *--:--------~---*-----------

66

*---***--- -----------*** ***- - -***-- *-*--*------*--*-. ---7""-***-****-**- --*------- **--*-

67

~------ -***--_

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. 68

~---------------------*---------*---------------

69

,--- ------~*- -------------

70

+-------~-*----i- -------*-

71 72 L--__

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

Battery __________ --'-'---

y'r

.... t

~--'--- *------Srftnall

. f..

~ppt{O\\J~~

Sf.Pl 1~79 D.. 0.S.-R..

....

ML17174A580

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