ML20011F346

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Rev 1 to Preventive Maint Procedure PM 9.5-41, Testing of Molded Case Circuit Breaker Overloads
ML20011F346
Person / Time
Site: 05000000, Haddam Neck
Issue date: 07/02/1979
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20008D796 List:
References
FOIA-89-404 PM-9.5-41, NUDOCS 9003050178
Download: ML20011F346 (6)
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yeventiveHalntemncePro:c4 art 1;o.th9.5D) s (d

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TESillir. Or l'OLOCD CASC CIRCULI CREtAER rr,7(o,t6 mTg wrt Fint*.%

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-1 1*1 This procedure provides ther steos etccssap to test th.

7 overload tel; ping of Wstir.31:o..se t/pc flin. I'F C,. A, 01, t

TB circuit breakers.

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2.1 FDSA section 9.4.2 t 3 2.2 Technical Specificatiens Dction 3.12 h

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' Connecticut Yantec Accidci.t Prevention !!anual

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4 4.1 This procedure cw!J t e used to per!orta preventive maintenance -

on any ciolded case circult breaker at Connecticut Yankee. some

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of which are saf ety related. Therefore. the shif t supervisor shall sip,n the checkoff to acknowledge that involved reactor operattenal personnel are aware of what safety related equipsent b

is belop, taken out cf or returned to service. If redundant equipment is required te be in serv..c while a breaker to beint, p

worktd on. the shif t wupervisor shall sis;n it.e checkof f to

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4.2 Work termit issued.

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4. 3 Equipment to be tested disconnected from bus and load with J

line and load side leads tagged and disconnected.

4. 4 Test instrurents shall oe in current celloration.

4.5 Af ter completion of all work or testing. the shif t supervisor sh.itl si.,n the checkot s' tu.icknowledge verif ication of operability k { p.

of saf ety related equipment asuciateJ vith breaker work on. prior i

to retututnc, equipment to service.

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5.1 Check all wires wit's velttge tester prior to remving for j

testing.

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5.2 Cnsure motor centro 11:r or breaker asserbly is returned to t

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6.1 Close the breater 6.2 Connect test leads to phase A and apply 300* of the rated current of the bre. iter.

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6.3 Record trip time on chee.L li.t and corpare with tatie f ri Attact.=ent

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6.4 Close the breaker.

o 6.5 Apply 1500% of the rated current of the breaker to phase A.

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6.6 Record the trip time on the check itst and veri.^/ ler." thv.1.0 j

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6.7 Disconnect test 1 cads from phase A.

l 6.8 Walt at least 5 minutes and then repeat steps 6.2 through 6.7 for phase B.

l 6.9 Wait at least 5 minutes e.nd then repeat steps 6.2 through 6.7 for pha.,e; C.

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.a PM 9.5-41 Rev. t o<

1M atlen M0II Type Current RatinR

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Involved reacter operat teml personnet have been inforsied j,

of what breaker in being renoved f rom service per step 4.1 7.1 g

Shif t Supervir.or _

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7.2 Redundant equipment operabt!!ty verified per step 4.1 j

Shif t Supervisor Date

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7.3 Prererloisites met per steps 4.3, 4.4 and 4.5 Job Supervisor l

7.4 Precaution

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Job Supervisor 7.5 Scope of work understood by all in'volved.

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7.6 Brealer closed, leads connected to phase A and 3005 test current applied to chase A per steps 6.1

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l 7.7 Trip time phase A nerecs with table in.

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7.8 Breaker closed per step

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7.9 Test current 150M app *,let per eter 6.5 l

l 7.10 Trip time is lers ths.n er.,eeeend Time l

7.!! Test leads disennnected per step 6.7 I

7,12 Breaker closed, leads connected to phase B. and3005 tett current applied to phase B per steps 6.1 1

and 6.8 t'

7.13 Trip time phase 0 agrees with table in L

.l AttacFaent 2 Time I

7.14 Breaker closed per step 6.S

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7 15 Test current 1%J% al.,*Ie,! ;er step 6.S t

7.16 Trip time is less th u one,recend Time 1

7.11 Test leads disconnected par stop 6.A f

I 7.18-Breaker closed, learfs connected to phase C, and 3004 l

l test current applied to phase C per steps 6.1 l

and 6.9 f

i 7.19 Trip time phase C _

agrees vith table in a + +., w.., + 9 n m.

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su.... e 7.20 Breaker closed per step 6.9 i

t 7.21 Test current 2;cof srptiel per etep 6.9 7.22 Trip time is lens thsn ene second.

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7.23 Test leads disconnetteJ per step 6.9 j'- l 7.24 E,gulpment operabt!!ty ver tfled per step 4.6 Shift Supervloor Date i

7.25 Involved reactor operttlonal rcr=onnel have been informed 3

of what breaker

(* bota; returned to service per step 4.1 t-'

Shift Supervisor Date f

8.0 Verify Job Order signed off and cor lete.

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Approved Date l

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Reviewed Dite L

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