ML17174A579

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: ML17174A577 ML17174A579 ML17174A580 ML17174A581 ML17174A582 ML17174A584 ML17174A585 ML17174A590 ML20062K353
References
6900-1, NUDOCS 8012160519
Download: ML17174A579 (4)

Text

DOP 6900-1 Arr Ac/I M&IVT ..3 Re.vision* 3 250 V_DC ELECTRTCJ\L SYSTEM 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.

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

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

(

3. .-APPROVED SEPl 1 '79 1

nnc.D

DOP 6900-1 Revision 3

. a* Equalizing battery * .* .. *.

(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, turn the timer dial up again to 24 hot.lrs. *D.O.S.R.

(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.

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

1;i:.

(1) The temperature corrected specific gravity of any R~11 is less than 1.205. (10 points below full charge value).

(2) When any .cell has a voltage less than 2.13 voi'ts~ (.04

~olts below nominal voltage of 2.17 volts).

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

. 2

nor 6900,...1 Revision 3*

(4) Before a battery discharge test *

(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 i t 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

uur> li;J00-1

. . Revision 3 CHECKLIST A

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

67

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

68 69

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

70 71 72 Unit Battery_ _ _ _ _ _ _ _ _ _ _--'--____

Operator_ _ _ _ _ _ _ _ _ ___;_

APPROVED

&Pl 179 D.0.S.R.

• Z. ( f i na 1)