ML20211C538
| ML20211C538 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/11/1997 |
| From: | Lizee N NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20211C529 | List: |
| References | |
| SP-3712T, NUDOCS 9709260236 | |
| Download: ML20211C538 (41) | |
Text
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- 78 of 82 9709260236 970918 PDR ADOCK 05000423 P
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qj alli,1, STONE NUCLEAlt POWElt STATION MAINTENANCE PltOCEDUltE Containment Penetration Overcurrent Device Surveillance Testing for Load Center, MCC, and Molded Case Breakers 1
SP 3712T 3
Rev. 6 S
i dTOP" HINK kCT#'
EVfEW 2
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Approval:
1 i
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PORC Mtg. No:
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Effective Date:
4///['77
/
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l Level of Use Subject Matter Expert:
General N. Lizcc
4 Millstone Unit 3 g,
Maintenance Procedure Containment Penetration Overcurrent Device Surveillance Testing for Load Center, MCC, and Molded Case Breakers TABLE OF CONTENTS 1.
PURPOSE.....................................................2 2.
P R E R EQ U I S ITES.............................................
3 1
3.
P R E CAUTI O N S...............................................
4 4.
I N ST R U CTI O N S..............................................
5 4.1 Load Center Breaker Overcurrent Test.......................
5 4.2 Gould MCC Starter Overcurrent Test..,.....................
8 4.3 Molded Case Breaker Overcurrent Test...................... 11 5.
REVIEW AN D SIGNOFF.....................................
14 6.
R E F E R E N CES...............................................
14 7.
S U M M A RY O F C H AN G ES....................................
15 ATTACHMENTS AND FORMS l, " Load Center Breaker Trip Times"................... 16
- AtIachment 2, "Gould Ampcap Trip Coil Acceptance Criteria"........ 17, "Gould Heater 300% Overload Current Tables"........ 18 " Molded Case Breaker Acceptance Criteria"..........
21 Maint. Form 3712T-1," Containment Penetration Conductor Overcurrent Protection Device Surveillance Test" Maint. Form 3712T-3," Load Center Breaker Containment l
Penetration Surveillance Test Data Shect" Maint. Form 3712T-4,"Gould Ampeap MCC Containment Penetration l
Surveillance Test Data Shect" Maint. Form 3712T-5," Molded Case Breaker Containment Penetration l
Surveillance Test Data Shect" SP 3712T Level of Use
-' TH!NK
.~ACT REVIEW Rev. 6 General STOP' 1of21
4
- 1. PURPOSli l.1 Objective This procedure satisfies Technical Specification Surveillance 4.8.4.1.a.2 for overcurrent testing of the following containment penetration overcurrent protection devices:
Load center breakers Gould Ampcap MCC starters j
Molded case breakers 1.2 Discussion Surveillance requirement 4.8.4.1.a.2 requires that 10% of each type of penetration conductor overcurrent protective devices below 4KV be functionally tested every 18 months. The function of the penetration conductor overcurrent protective device is to open the circuit on an overcurrent condition. Operability is proven by injecting overcurrent levels into the protective device and ensuring it trips within its required time band.
Satisfactory completion of section 4.1, meets the requirement for load center breakers.
Satisfactory completion of section 4.2, meets the requirement for Gould Ampeap MCC Starter.
Satisfactory completion of section 4.3, meets the requirement for molded case breakers.
For each circuit breaker found inoperable during these functional tests, an additional 10% of all the circuit breakers of the inoperable type shall also be tested until no more failurcs are found or all circuit breakers of that type have been tested.[+ LER 97-004-00]
This procedure should be performed prior to performing Urcaker PMs (SP 3712TA and SP 3712TB). Performing the PM first would precondition the breaker.
Instructions on operating the test equipment may be found in its operating instruction manual or in the MP 3787 series procedures. This procedure overrides any conflicts found between it and the operating instruction manual or the MP 3787 series procedure.
SP 3712T Level of Use STOP THiNK ACT REVIEV[
Rev.6 General 20f21
1.3 - Applicability gi This procedure applies to all circuit breakers described in Tecn:. cal Specifications, Millstone Nuclear Power Station, Unit No. 3, OPS Form 3273 - 3/4.3.8.4.1," Containment Penetration Conductor Overcurrent Protective Devices." This surveillance applies in modes 1,2, 3, and 4, 1.4 Frequency A minimum of 10% of each type of breaker below 4KV shall be functionally tested at least once every 18 months. Circuit breakers selected for functional testing shall be selected on a rotating basis.
- 2. PREREOUISITES 2.1-General 2.1.1 Surveillance cover sheet has been authorized by SM/US for surveillance testing to begin.
2.2 _ Documents f
2.2.1 Specification SP-EE-321 l
2.3 Measuring and Test Equipment 2.3.1 DMM, one of the following or as directed by FLS:
Fluke Model 8060A Fluke Model 8050A Fluke Model 27 2.3.2 High current test source, one of the following or as directed by FLS:
Multi-Amp Model CD-8130 Multi-Amp Model 832 Hipotronics Model 9050 2.3.3 Wahl Heat Prober Termocouple Thermometer, Model 2500MVX '
or as directed by FLS SP 3712T Level of Use
-THINK
-ACT
-REVIEW Rev. 6 STOP ~-
bened 3 0f 21
4 s
2.4 I)efinitions i.;a!. i l
2.4.1 FLS - First Line Supervisor i
- 3. P9ECAUTIONS 3.1 During testing, very high currents are generated. Although the voltage is l
low, a dangerous amount of power could be passing through the conductors. Do not break any test connections while a test is in progress.
i l
F I
l SP 3712T Level of Use General ST P TH!NK ACT-REVIEW Rev 6 4 of 21
4
- 4. INSTRUCTIONS 4.1 Load Center Breaker Overcurrent Test j
4.1.1 Refer To Specification SP-EE-321 and Attachment I and COhiPLETE page 1 of hiaint. Form 3712T-3.
I 4.1.2 PERFORhi instantaneous trip test as follows:
I a.
CONNECT one phase of load center breaker to a high current test sourec.
l b.
ENSURE breaker is closed, c.
Starting at a current level below minimum instantaneous pick-up value, PERFORM following:
1 NOTE Spurious trips may be minimized by maintaining the test time close to 0.10 seconds.
- 1) APPLY current to one phase of breaker for a minimum l
of 0.10 seconds.
- 2) E breaker has exceeded its acceptable trip current value AND did not trip, STOP test and CONSULT FLS.
- 3) E breaker did not trip, INCREASE current value and Go To step 4.1.2.c.1).
)
- 4) E breaker tripped AND time was greater than
(-
0.10 seconds, Go To 4.1.2.c.1).
- 5) E breaker tripped, RECORD trip current and time on Maint. Form 3712T-3.
d.
E trip current DR time does not meet acceptance criteria, CONSULT FLS.
REPEAT step 4.1.2 until all phases have been tested.
c.
SP 3712T
- Level of Use "k.
num R v.6 S*
^cr General 5 of 21
,,r.-.,.. - -..,.,,
- y s
.l-
--4.1.3 -
PERFORM short time delay test as follows:
<v a.
CONNECT one phase of load center breaker to a high -
current test source, b.
ENSURE breaker is closed.
c.
APPLY specified test current to one phase of breaker.
d.
E breaker has exceeded its acceptable trip time ANQ did imt l
trip, STOP test and CONSULT FIA l-c.
WHEN breaker trips, RECORD trip time on Maint. Form 3712T-3.
l-
[
f.
E trip time does not meet acceptance criteria, CONSULT l
FLS.
g.
REPEAT step 4.1.3 until all phases have been tested.
t 4.1.4 PERFORM long time delay test as follows:
a.
CONNECT one phase of load center breaker to a high current test source, b.
ENSURE breaker is closed.
c.
APPLY specified test current to one phase of breaker.
d.
E breaker has exceeded its acceptable trip time AND did not trip, STOP test and CONSULT FLS.
I c.
WHEN breaker trips, RECORD trip time on Maint. Form 3712T-3.
f.
E trip time does not meet acceptance criteria, CONSULT FLS.
g.
REPEAT step 4.1.4 until all phases have been tested.
4.1.5 E any data exceeded acceptance criteria, NOTIFY FLS:
lFLS l
a.
INITIATE a CR.
SP 3712T Level of Use
' THiNK '
-ACT REViEv/
Rev. 6 General STOP 6 of 21 s
c
i i
I i
b.
CONSULT work planning to schedule surveillance to bc
. ;i performed on an additional 10% sample of all the breakers of the inoperable type for each breaker found inoperable.
[+ LER 97-004-00]
4.1.6 RECORD date testing completed on Maint. Form 3712T-1.
j i
4 1
1 I
l l
1 Level of Use -
SP 37.12T ST P THiNK ACT REAEW Rev. 6 General 7 of 21
4.2 - Gould MCC Starter Overcurrent Test
.?:
4.2.1 Refer To Attachment 2 and DETERMINE acceptance criteria for instantaneous overload test and RECORD on page 1 of Maint Form 3712T-4.
4.2.2 ENSURE breaker test area temperature is 72 to 82*F.
4.2.3 MEASURE and RECORD breaker test area air temperature on Maint. Form 3712T-4.
4.2.4 Wi-IEN starter has been in breaker test arca for greater than 5 l
minutes, PERFORM instantaneous overcurrent test as follows:
l NOTE L
For instantaneous overcurrent testing, current should not be passed l
through thermal overload heaters. Heaters may be removed or bypassed l
as desired.
a.
CONNECT one phase of breaker to a high current test
,_l
- source, b.
ENSURE breaker is closed, c.
Starting at a current level below minimum instantaneous trip value, PERFORM following:
NOTE To minimize spurious trips, an attempt should be made to maintain test time as close as possible to 7 cycles,
- 1) For a minimum of 7 cycles, APPLY current to one phase of breaker,
- 2) IE breaker has exceeded its acceptable trip current value AND did not trip, STOP test and CONSULT FLS.
- 3) IE breaker did not trip, INCREASE current value and Go To step 4.2.4.c.1).
SP 3712T Level of Use TH!NK ~-
'-ACT.
' REVIEW Rev.6 General STOP' S of 21
- p o
- 4) E breaker tripped AND trip time exceeded 7 cycles, Q)
REPEAT step 4.2.4.
5)- E breaker tripped AND trip time was 7 cycles or less, RECORD trip current and time on Maint. Form 3712T-4,
- d. - E trip current does not meet acceptance criteria, CONSULT FLS.
c.
REPEAT step 4.2.4 until all phases have been tested.
4.2.5 E breaker did not meet acceptance criteria, CONNECT in series, ll two phases of breaker to high current test ource.
[+ LER 97-004-00]
a.
For a n'inimum of 7 cycles, APPLY current tc Srcaker, b.-
E breaker has exceeded its acceptable trip current value AND did not trip, STOP test and CONSULT FLS.
c.
E breaker did not trip, INCREASE current value and Go To step 4.2.5.a.
d.
E breaker tripped AND trip time exceeded 7 cycles, Go To stcp 4.2.5.a.
c.
E breaker tripped AND trip time was 7 cycles or less, RECORD trip current and time on Maint. Form 3712T-4.
- f. - CONTINUE testing until all phase combinations have been
- tested, g.
E trip current and time does not meet acceptance criteria, CONSULT FIS.
4.2.6 PERFORM thermal heater overload test as follows:
a.
Refer To Attachment 3 and DETERMINF at current for l
thermal heater overload test.
b.
RECORD test current for thermal heater overload test on page 2 of Maint. Form 3712T-4.-
SP 3712T Level of Use -
..S1 P.
--THINK...
~
REVIEW Rev.6 General ACT 9 0f 21
O
,. :e 1
( -.W NOTE m,
g LThe most common method of testing thermal overloads,la to apply current-l through the contactor and the heaters. This method uses the contactor dropping out to stop the test.
j e-e c,. CONNECT one phase of starter to a high current test sourec.
2 i_
d.
APPIX specified test current to one phase of breaker.
i 2
c.
IE starter has exceeded its acceptable trip time A.N_Q did not L
trip, CONSULT FLS:
i f,
WHEN starter has tripped, RELJRD trip time on Maint. Forrn 3712T-4.
[
g.
WAIT 5 minutes and REPEAT step 4.2.6 for all phases to be tested.
4.2.7 IE two phase testing.QR thermal overload testing data was not j.
within acceptance criteria, NOTIFY FLS:
L, l-lFLs l*
a.
INITIATE a CR.-
i j
b.
NOTIFY FLS and work planning to schedule surveillance to bc performed on an additional 10% sample of all the breakers of l-the inoperable type for cach breaker found inoperable, f
. [+ LER 97-004-00].
[
d 4.2.8 RECORD da:e testing completed on Maint, Form 3712T-1.
l-
-r 4
SP 3712T
.-Level of Use
'STOP
'THiNK ACT~
' REVIEW Rev.6 gemal 10 of 21
4.3 Molded Case lireaker OvercurreniTest r
.,ge 4.3.1 Refer To Attachment 4 and DETERMINE acceptance criteria for instantancous trip test.
4.3.2-RECORD acceptance criteria for instantaneous trip test on-page 1 of Maint. Form 3712T-5.
4.3.3 ENSURE breaker test area temperature is 72 to 82 F.
4.3A L MEASURE and RECORD breaker test area air temperature on Maint. Form 3712T-5.
4.3.5 WHEN starter has been in breaker test area for greater than 5 minutes, PERFORM instantaneous overcurrent test ns follows:
a.
CONNECT one phase of breaker to a high current test sourCc.
b.
ENSURE breaker is closed.
c.
Starting at a current level below minimum instantaneous trip value, PERFORM following:
NOTE 1.
'lo minimize spurious trips, an attempt should be made to maintain test time as close to 7 cycles as possible.
Excessive pulsing can cause premature trip.
- 1) For a minimum of 7 cycles, APPIY current to one phase of breaker.
- 2) E breaker has exceeded its acceptable trip current ulue M did not trip, STOP test and CONSULT FLS.
- 3) E breaker did not trip, INCREASE current value and
- Go To step 4.3.5.c.1).
- 4) E breaker tripped M trip time was 7 cycles or less, RECORD trip current and time on Maint. Form 3712T-5.
- 5) lE breaker tripped M trip time exceeded 7 cycles, Go To stcp 4.3.5.c.1).
Level of Use SP 3712T -
bened STOP THiNK' LACT
' REVIEW Rev. 6
- 4 ll of 21 s
r
+
'6);-- E breaker has exceeded its acceptable trip current value_
g AND did not trip, STOP test and CONSULT FLS.
I l
d, ' REPEAT step 4.3.5 until all phases have been tested.
NOTE l Two pole instantaneous testing is only required for 480V circuit breakers.
4.3.6 -
E breaker is used in a 480 V circuit AND a phase did not meet acceptance criteria, PERFORM the following testing:
(+ LER 97-004-00]
a.
CONNECT in series, two phases of breaker to high current test source.
l l
b.
Starting at a current level below minimum instantaneous trip value, PERFORM following:
- 1) For a minimum of 7 cycles, APPLY current to breaker.
- 2) E breaker did not trip, INCREASE current value and Go To step 4.3.6 b.1).
- 3) IE breaker tripped AND trip time was 7 cycles or less, RECORD trip current and time on Maint. Form 3712T-5.
- 4) E breaker tripped AND trip time exceeded 7 cycles, Go To step 4.3.6.b.1).
- 5) E breaker has exceeded its acceptable trip current value AND did not trip, STOP test and CONSULT FLS.
c.
CONTINUE testing until all phase combinations have been tested.
d.
IE trip current and time does not meet acceptance criteria, CONSULT FLS.
4.3.7 --
PERFORM time delay overcurrent test as follows:
O Refer To Attachment / and DETERMINE acceptance fh f
a.
L criteria for time delay overcurrent test.
SP 3712T Level of Use
PORC Mtg. No.
U Load Center lireaker Containment Penetration Surveillance Test Data Sheet 13reaker Location:
AWO #:M3-Trip Device 'lype:
Settings From Specification SP-EE-321 Ampere 'lhp:
' Function Long Time Short Time Instantaneous Multiplier Tap:
Delay Band:
N/A ACCEPTANCE CRITERIA Delay Time Long Time to Seconds Short Time to Seconds Delay Test Current Value Ampere Tap x
Multiplier Tap x % = Test Current Amps Long Time x
x3=
Short Time x
x 1.5 =
)
Maint. Form 3712T-3 Rev. 4 Page 1 of 2
7 Step #
OA O 11 OC Results j
4.1.2.c.
Instantaneous Anips OSAT Setpoint O UNSAT 4.1.4.c.
l.ong Time Seconds OSAT Delay 0 UNSAT 4.1.3.c.
Sliort Time Seconds OSAT Delay 0 UNSAT COMMENTS: _
Work Performed By:
Date:
Data Reviewed By:
Date:
Maint. Form 3712T-3 Rev. 4 Page 2 of 2 a
--.e-,,-.-
_/
W/IN7 3 -97 (?2/
Form Apptoved by Dir c Mill atnit 3
[/
Eff(ctivdDato PORC Mtg. No.
Gould Ani > cap ICC Containment l'enetration b lance Test Data Sheet Ilreaker Location:
AWO #:M3-
"llip Coil'lype: A80_
'llip Coil Setting:
Starter Size:
l lleater G30T I
Ambient Temperature:
INSTANTANEOUS TRIP TEST ACCEL'TANCE CRITERIA Trip Range:
to Amps Trip Time: 7 Cycles or less Instantaneous Overcurrent Test Results Step # 4.2 4.c.5)
OA 0 11 OC Units Results TtP Cunent Amps ST and Time Time Cycles
[] UNSAT INSTANTANEOUS TRIP TEST USING TWO PIIASES Instantancotis Overcurrent Test Results
- N/A O St ep, 4.2.5.c.
OA--011 Oll-OC OA-OC Trip Current Amps Trip Time Cycles
- N/A if not performed Maint. Form 3712T-4 Rev. 5 Page 1 of 2
/
TIME DELAY OVEllCUltitENT Q,#
ACCEPTANCE CRITERIA llip Time 17 to 68 seconds lleater Overload Test Results Step # 4.2.6.f.
OA Oli OC Results U SAT Trip Time Seconds U UNSAT COMMENT / REMARKS
(
Woik Performed 13y:
Date:
Data Reviewed 13y:
Date:
f Maint. Form 3712T-4 Rev.5 Page 2 of 2
Form Appeoved by Director illstoptiUnit 3 -
Will97 3 '77 07)
~
Eff/ctiv6 Date PORC Mtg. No?
..+-
Molded Ci se lirca er Containinent l'enetration Su iltance Test Data Sheet l
13reaker Location:
AWO #:M3-Ilreaker Manufacturer 13reaker Rating 13reaker 'lype:
'llip Setpoint:
i Ambient Temperature:
1 INSTANTANEOUS TRIP TEST i
ACCICPTANCIC CRITl?!(IA Q Adjustable Q liixed Tiip Range:
to Amps Trip Time: 7 Cycles or less Instantaneous Overcurrent Test Results Step # 4.3.5.c.4)
OA 0 13 OC Units Results
' Dip Current Amps OST and Time Time Cycles O UNSnf INSTANTANEOUS TRIP TEST USING TWO PHASES Instantancons Overcurrent Test Results
- Step 4.3.6.3)
OA-OB OB-OC OA-OC Trip Current Amps Trip Time Cycles
- N/A if not performed Maint. Form 3712T-5 Rev. 3 Page 1 of 2
TIME DELAY OVERCURRENT td ACCEPTANCE CRITERI A Trip Time to seconds i
x (3) litcaker Rating 3009lr overload Test current i
Time Delay Overcurrent Results l
Step # 4.3,7.g.
OA Oil OC Results O SAT Trip Time Seconds l
0 UNSAT l
COMMENT / REMARKS Work Performed 13y:
Date:
Data Reviewed 13y:
Date:
Maint. Form 3712 T-5 Rev.3 Page 2 of 2