ML17174A579

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DOP 6900-1,Revision 3, 250 Vdc Electrical Sys
ML17174A579
Person / Time
Site: Dresden 
Issue date: 07/31/1979
From:
COMMONWEALTH EDISON CO.
To:
Shared Package
ML17174A578 List:
References
6900-1, NUDOCS 8012160519
Download: ML17174A579 (4)
v • d • e


Text

(

Arr Ac/I M&IVT..3 250 V_DC ELECTRTCJ\\L SYSTEM DOP 6900-1 Re.vision* 3 July 1979 The purpose of this procedure is to outline the u*ethod. used to.

pl:tce 'the battery,J1.1i-gcr i.n sci-vice, operate it norrn:1lly, trans-ferr:i.ng to an alternate poh*er source,.:ind rc*rnov.ing the battet*y chn.q;er from ~;*~rvi.ce *an the 250 VDC electrical system.

B.

REFERF:Ncr:s

1.
  • . None.
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 made or found to be inoperabl~ for any reason, continued reactor operation is permissible only during the succeedi.ng seven days unless such battery system is ~ooner made operable.

F.

PROCEDURE

1.

Placing Charger in Service.

a.

CLOSE the charger 480-V suppli breaker (MCC 28-2 fo~

2 charger, MCC 29-2 or 39-2 for 2/3 charger, ~nd MCC.

38-2 for 3 charger).

b.

The supplies for the 2/3 charger are key interlocked

  • so that only one may be closed.
c.

CLOSE the a-c breaker at the charger. cabinet.

d.

CLOSE the d-c breaker at the charger cabinet.

e.

CLOSE the d-c breaker CHARGER to BATTERY BUS 2(3) at 250 VDC turbine building MCC 2(3).

2.

Nonnal. operation.

3.
    • :a~::_;.;_<;rite charger control will be in.FLOAT.

Verify t_hat

  • ~~ttery ~oltage is being maintained, and the charger is at 260.4 volts.

.-APPROVED SEPl 1 '79 1

nnc.D

. a*

b.

Equalizing battery

  • DOP 6900-1 Revision 3 (1)

Verify tfiat the eleetrolyte levels in the cells_

are between the low level 3nd hieh level marker~.

Fill with water if low.

Avoid spilling ~ater

. o.n top of cells.

If any is_ spilled, wipe it dry.to avoid shurti.ng cells.

(2)

Turn dial on battery chareer to 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> equalize.

Repeat St1?p 6 two adMti1)nal tir.1es.

The charger should re<Id 270.0 volts during the equalize charge.

(3)

  • Battery is to be equalized for at lc;ist 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

(4)

Giv~ the time of $tart of cqu3lizing charge to the Shift Engineer so he can record it and passA. pp. ROVE it on to the following ~hifts.

~

(5)

Verify periodically' the electrolyte levels.

SEP 11 '79 (6)

After appro~imately 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> of charging ti.me,

  • D.O.S.R.

turn the timer dial up again to 24 hot.lrs.

(7)

After approximately 69 hours7.986111e-4 days <br />0.0192 hours <br />1.140873e-4 weeks <br />2.62545e-5 months <br />. of chargirig time turn dial up to at least 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.

(8). When cha_rging current has tapered and stabilized.*

(no further ieduction for 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />), continue charging until there is no further increase in_

the lowest cell voltage.

Perform this by doing:

the following at t~e end of the 66th, 67th, 6~th; 69th, 70th, 7lst and.72nd hours:

(a)

With a voltmeter, find the lowest cell v6ltage-and record on attachment A.

(b)

Read the charging current off the battery

  • charger_ and record on attachment A.

(9)

If no changes in the readings are noted, terminate equalization.

If there is a change, continue steps. i~ (6) until no chang~ is found.

(a)

Terminate equalizing by turning equalizer timer dial to zero.

Place the.charger in the.EQUALIZE mode for the condit;ions listed below.

1;i:.

(1)

(2)

The temperature corrected specific gravity of any R~11 is less than 1.205.

(10 points below full charge value).

When any.cell has a voltage less than 2.13 voi'ts~

~olts below nominal voltage of 2.17 volts).

(.04 (3)

When the battery has received an emergency discharge lasting 15 minutes or more.

2

(4)

Before a battery discharge test

  • nor 6900,...1 Revision 3*

(5)

Monthly, r.~gar<lless of.the conditions 011tlim~d ;11:11we.

c.

Observe nonr..11 bus *voltage 1luring operilti.on.

4.
  • .Transfer 250 VDC *reactor buildi.ng MCC to alternate source.
a.

OPEN the reactor huildi.ng ~iCC fcc<l brL'<.1ker. from th!:! cipposite nni*

turbine bui. lding :-tCC :rnd tag it OUT-OF--SEi\\VICE.

b.

Verify that the rr;Ktor building MCC frcd brl!<lker from the respective u11it turbine building MCC is* open, and tag it OUT-OF-SERVICE *.

c.

Remove the copper links from their present location*

and insert them in the altern;ite feed location.

  • d.

Clear the OUT-OF-SERVICE cards and CLOSE, the reactor building MCC feed b~eaker from the respective turbine building Mee.

5.

Removing a charger from service.

a.

Verify that another* charger is connected to the ba~tery bus.

. b.

. OPEN the CHARGER TO BATTERY BUS breaker at the 250. *.

VDC turbine building MCC 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 volt r.iOt'ot control center.

(MCC 28-2 Unit 2, MCC 38-2 Unit 39

  • MCC 29-2 or MCC 39-2 Unit 2/3).
f.

Rack out the breaker and place cards as required.

G.

CHECKLISTS

1.

Checklist A.

H.

TECHNICAL SPECIFICATION REFERENCES

. 1.

Section 3.9.

2~

Section 4.9.

.APPROVED SEPl 1 '79 D.O.S.R.

3

CHECKLIST A uur> li;J00-1 Revision 3

  • . *:,i~~=; ~\\~J=~~:~~~~r:Cll,:R:~~j-~R~:=

67

*------.--------*~ **--------*--**------*-*--**---

68 69

. -- ----*-------- *--,----*------------------1--------------------

.,__ 70 71 72 Unit ---------,--------

Battery ___________ --'--____

Operator __________ __;_

  • Z. ( f i na 1)

APPROVED

&Pl 179 D.0.S.R.

I.

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