ML20011F358

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Rev 5 to Preventive Maint Procedure PM 9.5-41, Testing of Molded Case Circuit Breaker Overloads
ML20011F358
Person / Time
Site: 05000000, Haddam Neck
Issue date: 07/15/1986
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20008D796 List:
References
FOIA-89-404 PM-9.5-41, NUDOCS 9003050191
Download: ML20011F358 (8)
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Preventive Maintenance Procedure W.

No. PNP 9.5-41 PLAlt? OPgRATHMes agvitW CetuMTTER APPROVAL ' bi nw&s

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TESTINC 0F MOLDED CASE CIRCUIT BREAKER h.;.

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APPe0VfD fiPPECTivtDATh i

1.0 OBJECTIVE C/- / bh

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1.1 -This procedure provides the etepe necessary to test the overload-g 4'

tripping of Westinghouse type RFA RFB, TA, or FS circuit breakers.

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2.0 LICENSE OR ADMINISTRATIVE REQUIREMENTS

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2.1 FDSA Section 9.4.2.

N 2.2 Technical Specifications Section 3.12.

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3.0 REFERENCES

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s 3.1 Connecticut Yankee Accident Frevention Manual.

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4.0 PREREQUISITES M,..

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4.1 This procedure could be used to perform preventive maintenance-on any g#

molded case circuit breaker at Connecticut Yankee, some of which are safety-related.. Therefore, the Shif t Supervisor shall sign the g

i Checkoff to acknowledge that involved reactor operational personnel'

are aware of what safety related equipment to being teken out of or W,

returned to service. If redundant equipment to' required to be in FJ service while a breaker is being worked on, the Shif t Supervisor shall fg

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sign the Checkoff to acknowledge verification of the operability of L

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the redundant equipment.

IM 4.2 Work Order issued.

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4.f Equipment to be tested disconnected from bus and load with line and

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p,, [.7 load side leads tagged and disconnected.

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4.4 Test instrumente shall be la cartent calibration.

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4.5 Af ter complettoe of all werk or testing, the Shif t Supervisor hall e'

sign the Checkoff to acknowledge verification of operability of safety C.

,O related equipment associated with breaker worked os, prior to

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retwening equipeest to servlee.

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5.0 PRECAUT10Ns-5.1 Mark all connections before disconneettag.

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5.2 Check all vites with voltage tester prior to removing for testing.

5.3 Ensure motor controller or breaker assembly la returned to M.C.C. and

~c locked in after completion of testing.

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6.0' PRO'EDURE I-b.

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6.2 QC Required Inspector to verf fy wiring diagram correct.

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6.3~, Disconnect wires and remove breaker coupertment frou the MCC.

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1 6.4 - Disconnect wires from phase A and close the breaker.

' {' i 6.5 Conneet teet leads to phase A and apply 3002'of the rated current of g

the breaker.

g, t-6.6 Record trip time on Check List' and compere with table in Attachment 2.

r L-6.7 -Close th'e breaker.-

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. 6.8 Apply 15002 of the rated current of the breaker to phase A.

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6.10 Disconnect test leads and reconnect compartment wires for phase A.

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,.r 6.11 Wait at least 5 minutes and then repeat Steps 6.4 through 6.10 for

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i, 6.12 Wait at.leasc 5 minocea and then repeat Stepe 6.4 through 6.10 for k

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g.J 6.13 Install breaker compartment and connect wires per wiring diagram from 4

L. D, 6.14 QC Required Inspector to verify wiring connected per wiring diagres

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removed free service per Step 4.1.

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7.2 Redundant equipment operability verified

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gfv 7.3 Prerequisites set per Stepe 4.3, 4.4 and 4.5.

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7.4 Wiring diagrams drawn on Attachment 3 per Step 6.1.

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7.5 oc Required Inspector to verify viring diagram.

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7.6 Wires disconnected and breaker compartment removed 3.C s,.

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.7.7 Breaker closed, leads connected to phase A, and

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3001 test current applied to phase A per Stepe

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7.8 Trip time phase A agrees with table la Y

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l test current applied to phase "A"per Step 6.7 and 6.8. ~

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7.10 Trip time is less than one second.

Time W:2 7.11 Test leado disconnected per Step 6.10.

.,'i 1 7.11 Independent verification of trip times for A phase.

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Ke 7.13 treaker closed lesde connected to phase B, and

-3002 test current applied to phase B per Steps 6.11.

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L agrees with table in 7.14 Trip time phase 8!

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7.15 Bresher elooed and 15001 test current applied p'

to l'hase 3 per Step 6.11.

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7.16 Trip time is less than one second.

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7.17 Test leada disconnected per Step 6.!!.

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7.18 Independent verificatice of trip times for B phase.

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7.20 Trip time phase C agrees with table in

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7.23 Test lesJa disconnected per Step 6.12.

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t 7.24 Independent verification of trip times for C phase.

7.25 Breaker assembly-installed and wires cor.nected as per.

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i 7.26 QC Required Inspector to verify wires ccnnected as C

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i 7.27 Equipment crerability verified per Step 4.5.

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Shitt Supervisor Date

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7.28 Involved reactor operation personnel have been informed of what breaker is being 8

returned to service per Step 4.1.

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