ML20140C527
| ML20140C527 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/12/1997 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20140C499 | List: |
| References | |
| PROC-970512, NUDOCS 9706090299 | |
| Download: ML20140C527 (70) | |
Text
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Pump Inspection Record 7m (sheet 3pf 3) l t,v I
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Step No.
Function Performed Initials NA i.
4.8.1.m.
Record force to press shaft I
4.8.2.d.
Record number of cone gaskets 4.12.27.e.
Record reading (E) l 4.12.27.h.
Record reading (F) 4.12.27.i.
Calculate and record:
(G)=(F)-(E)=
4.12.29.c.
Record thickness of shims to be installed l
4.14.6 Record number of rings before lantern
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Record number of rings after lantern Record number of total packing rings Comments:
l Work Performed by / Date Data Reviewed by / Date i
Maintenance Supervisor 2
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MP 728.1 i V Level of Use "srof
'T[HINI (ACM 'EEVl5@
Rev.5 General
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45 of 45 9706090299 970603 i
PDR ADOCK 05000245 P
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l MILLSTONE NUCLEAR POWER STATION MAINTENANCE PROCEDURE i
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l Metal-Clad Switchgear 'I)pe M-26 MP 772.6 Rev. 3
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je ja lo Approval-A U
PORC Mtg. No:
I-99-08l Date:
5-IE-9'7 Effective Date:
G-l@ - D Level of Use Subject Matter Expert:
l General D. Chase l
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Millstone Unit 1 f
Maintenance Procedure V
Metal-Clad Switchgear Type M-26 l
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TABLE OF CONTENTS 1.
PURPOSE....................................................3 2.
P R E REQ UI S ITES.............................................
4 l-3.
P R E CAU TI O N S................................................
8 4.
IN STRU CTI ON S............................................
10 4.1 Switchgear Exterior and Door Cleaning, Lubrication, an d Inspectio n........................................... 10
. 4.2 -
Cubicle Interior Cleaning and Inspection....................
12
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l 4.3 Primary Disconnect Penetration Measurement and i
I.
Adjustment - Preferred Method..........................
21 l
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4.4 Primary Disconnect Penetration Measurement and
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Adjustment - Alternate Method (Optional).................
23 4.5 Primary Bushing Finger Adjustment........................
28 gV 4.6 Elevator Lifting Bracket Adjustment (Optional)..............
29 4.7 Switchgear Primary Bushing Alignment (Optional)............
33 4.8 Operational Checkout, Interlock Roller and Auxiliary Switch '
I Adj ust m e n ts............................................
3 6 4.9 Sto p Pins and Stop Bolts Clearance Measurement and Adjustment......................................... 40 4.10 Secondary Disconnect Gap Measurement and Adjustment (Optional)...................................
40 4.11 Transformer Rollout Cleaning and Inspection (Optional)......
42 4.12 Bus Connection Cleaning and Inspection (Optional)..........
45 4.13 Post Maintenance Testing.................................
51 5.
REVIEW AN D SIG N-OFF....................................
54 6.
R E FE R EN CES.............................................
5 4 7.
S U M M A RY O F CH AN G ES....................................
55 l
ATTACHMENTS AND FORMS l
-, "'Fypical Switchgear"..............................
56 L, " Elevating Mechanism Details".....................
57
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Level of Use
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'., " Bus Connection Torque Wlues"...................
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. Maint. Form 772.6-1, " Metal-Clad Switchgear Dpe M-26 Inspection Checklist" -
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Maint. Form 772.6-2," Metal-Clad Switchgear Dpe M-26 Inspection Checklist (Optional)"
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- 1. PURPOSE
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1.1 Objective l
This procedure provides instructions for cleaning and inspection of i
-General Electric (GE) 4160-volt, metal-clad switchgear, type M-26.
l 1.2 - Discussion r
This procedure provides instructions for performing inspection, cleaning, and adjustment of GE type M-26 switchgear. This procedure is based on GE recommendations, Unit 1 Maintenance, Engineering, and Nuclear Training personnel experience, and the Electric Power Research Institute (EPRI) Preventive Maintenance Program Basis for Medium Voltage Switchgear. The procedure is divided into sections that accomplish each l.
major preventive maintenance task. Some tasks require the buses to be L
deenergized and are not required to be performed for each maintenance
(
j interval. These sections are followed by "(Optional)"in the section title.
Maintenance may be performed on several cubicles at the same time if necessary.
Unless directed othenvise by Engineering or FLS, switchgear PM includes performance of the following sections:
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l Section 4.1,"Switchgear Exterior and Door Cleaning, l
j Lubrication, and Inspection" Section 4.2, " Cubicle Interior Cleaning and Inspection" j
Section 4.3," Primary Disconnect Penetration Measurement and Adjustment -Preferred Method" l
Section 4.5," Primary Bushing Finger Adjustment" Section 4.8," Operational Checkout, Interlock Roller and i
l Auxiliary Switch Adjustments" Section 4.9,"Stop Pins and Stop Bolts Clearance Measurement and Adjustment" Section 4.13," Post Maintenance Testing" f~h Q
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The following sections are performed as directed by FLS, Engineering or Q
an AWO:
l Section 4.4," Primary Disconnect Penetration Measurement and Adjustment-Alternate Method (Optional)"
Section 4.6," Elevator Lifting Bracket Adjustment (Optional)"
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.Section 4.7,"Switchgear Primary Bushing Alignment (Optional)"
Section 4.10," Secondary Disconnect Gap Measurement and Adjustment (Optional)"
Section 4.11," Transformer Rollout Cleaning and Inspection (Optional)"
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Section 4.12," Bus Connection Cleaning and Inspection l
(Optional)"
i 1.3 Applicability 1.3.1 This procedure applies to GE 4160-volt, M-26 switchgear.
- 2. PREREOUISITES 2.1 General i
2.1.1 Electrician has reviewed Main One Line schematic for equipment j
l under maintenance.
i 2.2 Documents j
l 2.2.1 Main One Line schematic for switchgear and bus, as necessary i
2.2.2 MP 772.2,"High Voltage Grounding 4160 Switchgear" l
2.3 Personnel I
2.3.1 Personnel performing this procedure shall be qualified on medium-voltage circuit breakers and switchgear, or shall be i
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overseen by qualified persons.
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l 2.4 Definitions 2.4.1 STRIKE-hit forcefully O
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h) 2.5 Measuring and Test Equipment (M&TE) 2.5.1 All M&TE has been calibrated in accordance with WC 8,
" Control and Calibration of Measuring and Test Equipment" and the calibration is current.
2.5.2 QA torque wrenches (click or dial type) with a minimum accuracy and maximum torque wrench full scale value listed in the table below for the specified torque application range.
Specified Torque Maximum Torque Wrench Minimum Accuracy Application Range Full Scale Value 23 to 27 in-lbs between 75 and 100 in-lbs 5%
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2.5.3 Megger with a range of 0 to 5000 volts, and a minimum accuracy of 2%, such as QA-1554 2.5.4 Biddle ductor low resistance ohmmeter with range of 0 to 600 milliohms, and an accuracy of 0.4% of reading, such as OA-1609 U
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MP 772.6 Level of Use
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q 2.6. Tools and Consumables
- O 2.6.1 Tools L
Bushing finger alignment tool (fabricated)
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Combination wrench set /4" to 1"
' Container, one pint capacity l
Electrician's standard tool kit l.
Feeler gages l
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I Level (2 to 3 feet long)
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Mechan'ic's standard tool kit i
Nut driver set /4" to /2" f
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Q-tips l
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Ruler, tape i
s Ruler,6-inch steel i
Soft-bristle brush a
.i Soft-mallet hammer j
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Wooden or fiber scraper t
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MP 772 6 Level of Use
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i 2.6.2 Equipment l
Face shield i
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High-voltage rubber gloves j
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Hight-voltage source tester -
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Flash jacket
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T.I.E voltage tester (with' extension handle)
Vacuum cleaner equipped with nonmetallic cleaning
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. attachments 1
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2.6.3 Consumables l Q-Approved cleaning solution such as Electrokleen Approved cleaning solution such as Simple Green Approved degreasing solvent such as PF Degreaser l
Cleaning swabs l
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Denatured alcohol Fine grit abrasive
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l GE D50H109 joint compound or other approved joint compound l
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GE D50H119 filler compound or Solarite KM 1592, or other 4
l approved filler compound l
GE RTV-103
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1 GE D6A15Al grease or Mobilgrease 28 (red grease) l j
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[h Insulating tape v
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Low-lint cloths Scotch 33 tape i
Sterling U310 and U311 varnish or other approved varnish i
- 3. PRECAUTIONS l
3.1-Consumables to be used in or on power plant components must be l-controlled in accordance with CC 1," Control of Chemical Consumable l
Products."
3.2 ' Eye protection and rubber gloves should be used when handling D50H109 joint compound.
3.3 During disassembly, all disassembled parts should be tagged or identified.
All mating parts should be identified for proper match-up during assembly.
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!h 3.4 During disassembly, inspection, repair, and assembly, switchgear llH) components should be protected from operations that can generate foreign particles.
3.5 Some sections of a switchgear lineup may remain energized depending on plant conditions. Low voltage circuits such as space heaters, annunciators, de power supplies and protective relays may be energized. A thorough understanding of the scope of the job and tagging required for each switchgear is necessary prior to the start of work.
3.6 When the cubicle being serviced is energized with 4160 volts, and the shutter doors are open or the elevators are raised, the cubicle should not be entered. Only when primary voltage to both the bus and the load side disconnects are tagged out, may the elevator assemblies or shutter mechanism be adjusted or disassembled.
3.7 Some buswork connections in 4160-volt switchgear cubicles are insulated with a material called Ductscal. This material may contain asbestos.
Safety and IIcalth Department recommends the following actions be takenpriorto removal of Ductsealinsulation:
Safety and Health Department must be notified to establish recommended work practices.
(mj A bulk sample of Ductscal must be taken and analyzed.
i Air sampling may be performed as necessary.
3.8 When returning a 4KV circuit breaker to cubicle, an elevator handle latch must be installed if the breaker is to remain on the cubicle floor. The j
elevator handle latch must be removed if breaker is to be rolled out of cubicle.
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- 4. INSTRUCTIONS
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4.1 Switchgear Exterior and Door Cleaning, Luhrication and Inspection ALARA Use of a vacuum cleaner in contaminated areas should be with the consent of the Health Physics Department.
NOTE Maint. Form 772.6-1 contains checklist with acce switchgear exterior and door cleaning, lubrication,ptance criteria for and inspection.
4.1.1 Using the following, CLEAN outside of switchgear:
Soft-bristle brush Approved cleaning solution
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Low-lint cloths l
Vacuum cleaner with nonmetallic cleaning attachment 4.1.2 1E necessary, using approved degreasing solvent and low-lint cloth, CLEAN tightly adhering grease and dirt from switchgear externals.
4.1.3 INSPECT externals for dirt or damage, and RECORD inspection results on Maint. Form 772.6-1.
MP 772.6 Level of Use ACT-Rev. 3 REVIEW STOP"
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4.1.4 INSPECT switchgear for the following damage and RECORD i
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inspection results on Maint. Form 772.6-1:
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Broken or missing cover lenses on instruments i
i Damaged switch handles a
Broken or cracked indicator light bulbs or lenses i
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Dragging or misaligned doors l
Damaged or inoperable door-latching mechanism
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Pitting or flaking of external paint j
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4.1.5 IE inspection results are not satisfactory, CONSULT FLS for l
further maintenance instructions.
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Using D6A15A1 grease or Mobilgrease 28 LUBRICATE the
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following components, as necessary, and RECORD on Maint.
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Form 772.6-1:
Door latch handle mechanism J
Door catch at top of cubicle j
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Captive screw threads at top of door
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l 4.2. Cubicle Interior Cleaning and Inspection i
l STOP WARNING STOP l
If cubicle being serviced is energized with 4160 volts, it is good practice to install a Plexiglass protective barrier (des added protection for personn shutter) below the installed metal l
shutters. This Plexiglass barrier provi i
working in the circuit breaker area of an energized cubicle. The Plexiglass J
barrier should not be used instead of metal shutter doors.
a l
NOTE l
Maint. Form 772.6-1 contains checklist with acceptance criteria for circuit l
breaker cubicle interior cleaning and inspection.
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4.2.1 IE cubicle is energized with 4160 volts, INSTALL Plexiglass
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protective barrier below installed metal shutter unless otherwise directed by FLS.
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i 4.2.2 IE not previously performed, REMOVE circuit breaker from l &]
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cubicle.
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4.2.3 RECORD component identification number for cubicle on each page of Maint. Form 772.6-1.
l ALARA I
I Use of a vacuum cleaner in contaminated areas should be with the consent of the Health Physics Department.
L 4.2.4 Using the following, CLEAN circuit breaker cubicle:
Soft-bristle brush
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Approved cleaning solution e
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Low-lint cloths Vacuum cleaner with nonmetallic hose attachment i
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MP 772.6 Level of USe
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4.2.5 INSPECT circuit breaker cubicle for damage, and RECORD D
l:G inspection results on Maint. Form 772.6-1.
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NOTE Racking mechanism is raised and lowered as necessary in this section to l
facilitate cleaning, inspection, and lubrication.
4.2.6 RAISE and LOWER racking mechanism as necessary.
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STOP WARNING STOP
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Primaries may be energized. Do not open shutter doors during steps 4.2.7 and 4.2.8.
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4.2.7 Using approved degreasing solvent, low-lint cloth, and small f
bristle brush, CLEAN tightly adhering grease and dirt from the followmg as necessary:
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Jack screws
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..lV Guide rails l
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i Lin.ng brackets j
Rack down levers Shutter cams and doors Miter gears Chain and idler a
Slide clutch Anti-creep plunger Ground shoe l
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Level of Use n
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MP 772.6 Generai 87 E ' *#
[ACT MIEW Rev. 3 13 0f 58
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/7-NOTE G
Structural damage and defects include breakage, cracks, deformation, distortion, corrosion, pitting, scoring, scratches, erosion, galling, and j
indications of misalignment. Evidence of metal shavings or binding may 1
indicate misalignment 4.2.8 INSPECT the following components for wear, structural damage, l
and defects.
1 Jack screws l
=
I Guide rails I
l Lifting brackets
=
Rack down levers
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a i
Shutter cams and doors Miter gears Chain and idler Slide clutch Anti-creep plunger
=
Ground shoe a
l 4.2.9 IE inspection results are not satisfactory, CONSULT FLS for further instructions.
4.2.10 With clutch handle released, ENSURE anti-creep plunger is fully seated in clutch.
4.2.11 IE anti -creep plunger does not fully engage clutch, CONSULT FLS for further direction.
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NOTE Drive chain must be tightened with a slight play, but chain must not bounce up and down excessively when operatmg.
4.2.12 INSPECT drive chain is tightened with a slight play.
4.2.13 E drive chain adjustment is necessary, LOOSEN idler assembly and ADJUST as necessary.
4.2.14 ENSURE idler assembly is tightened.
4.2.15 E circuit breaker cubicle is suspected of being unserviceable, CONSULT FLS for guidance.
4.2,16 Using D6A15A1 grease or Mobilgrease 28, LUBRICATE t' e following, as necessary:
Jack screws Guide rails Lifting brackets a
Rack down levers a
Shutter cams and doors Miter gears Chain and idler a
Slide clutch a
Anti-creep plunger
=
Ground shoe
=
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MP 772.6 Level of Use
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' REVIEW Rev.3 General i(
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y STOP WARNING STOP
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To prevent injury to >crsonnel and damc; :o equipment, energized.
interlocking circuits indicator li his, annunciator, control power circuits) should be identified nd avoide.
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4.2.17 ENSURE energized circuits are identified.
i 4.2.18 Using soft-bristle brush or low-lint cloths, CLEAN dust and debris from control wiring and terminal blocks.
l 4.2.19 Visually INSPECT wiring for the following:
)
Broken wire strands
)
Loose connections Cut or damaged insulation
=
Signs of overheating or burned insulation
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'4.2.20 IE wiring shows signs of overheating, PERFORM the following:
a.
INSPECT the following to determine potential source of overheating:
Lugs Cable insulation
)
Cable jacket High-voltage terminations
=
l b.
CONSULT FLS for further instructions.
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4.2.21 RECORD wiring inspection results on Maint. Form 772.6-1.
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4.2.22 Visually INSPECT terminal blocks for signs of damage.
4.2.23 IE inspection results are not satisfactory, CONSULT FLS and l
REPLACE terminal block.
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MP 772.6 Level of Use
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4.2.24 RECORD terminal block inspection results on Maint. Form
.t 772.6 - 1.
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4.2.25 Visually INSPECT fuse block and fuse holder as follows:
Visually INSPECT fuse block and holder for cracks or signs a.
of arcing.
b.
E inspection results are not satisfactory, CONSULT FLS and l REPLACE fuse block.
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c.
ENSURE male contact probes in fuse holder are perpendicular to cover.
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d.
E black contact grease is installed on contact probes in fuse holder, using approved solvent and low-lint cloth or wooden scraper, REMOVE black contact grease.
e.
APPLY thin layer of D6A15A1 grease or Mobilgrease 28 to l
contact probes.
f.
REMOVE and INSERT fuses in fuse holder.
g.
E fuses are easily rotated by hand while installed in holder,
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REMOVE fuse and TIGHTEN fuse clips.
l h.
INSERT and REMOVE fuse holder in fuse block.
i.
E fuse holder is loose in fuse block, CONSULT FLS for l
further instructions.
4.2.26 RECORD fuse block and fuse holder inspection results on Maint.
Form 772.6-1.
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l NOTE The following cleaning and inspection of relays is not usually performed as part of routine mamtenance.
4.2.27 E directed by FLS, CLEAN and INSPECT relays as follows:
l a.
Using approved cleaning solution and low-lint cloth, CLEAN top and sides of relay.
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MP 772.6 Level of Use
",STOP '
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/ 4 17 of 58
I' b.
ENSURE relay mounting hardware is tight.
c.
ENSURE relay covers fit tightly.
d.
Visually INSPECT relay for damage, e.
INSPECT relay wiring for looseness or damage.
f.
E inspection iesults are not satisfactory, CONSULT FLS for l further instructions.
l 4.2.28 RECORD relay inspection results on Maint. Form 772.6-1.
l NOTE Further inspection and adjustment of the secondary disconnect is performed later in this procedure.
4.2.29 CLEAN and INSPECT secondary disconnect as follows:
a.
Using approved cleaning solution and low-lint cloth, CLEAN external surfaces of secondary disconnect.
1 b.
REMOVE screws and secondary disconnect cover, c.
INSPECT wiring connections for the following:
Loose connections or pins Damaged terminals Signs of overheating l_
l d.
INSTALL secondary disconnect cover.
e.
Using approved cleaning solvent and swab, CLEAN secondary disconnect contacts.
f.
E contacts are badly tarnished, using a swab made of fine or extra-fine Scotch Brite or other approved fine abrasive, i
gently CLEAN contacts.
g.
E inspection results are not satisfactory, CONSULT FLS for further maintenance instructions.
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MP 772.6 Level of Use
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Using swab, APPLY thin layer of D6A15A1 grease or
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Mobilgrease 28 to secondary disconnect contacts.
l 4.2.30 RECORD secondag disconnect inspection results on Maint.
Form 772.6-1.
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C A U TIO N Cleaning switches with solvents may lead to premature switch failure.
NOTE It is recommended that compressed air be between 25 and 30 psig.
4.2.31 CLEAN and INSPECT switches as follows:
Using low-lint cloth or compressed air, CLEAN the a.
following:
Station auxiliary switch (52 STA)
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Circuit breaker position switch (52 TOC or truck switch) l
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' =
Local operator switch on door b.
INSPECT switches for the following:
Loose wiring
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.i Damage
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Cracks
=
Smooth operation
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c.
INSPECT circuit breaker position switch operator and guide for excessive wear or damage.
d.
IE applicable, ENSURE 52 TOC switch lever set screw is tight.
1 b) i
't MP 772.6 Level of Use
' "REV EW Rev.3 General sw
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I E applicable, TORQUE switch tie bolts to 25 in-lbs (23 to l
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27 in-lbs).
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E inspection results are not satisfactory, CONSULT FLS for l l-further instructions.
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4.2.32 RECORD switch inspection results on Maint. Form 772.6-1.
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L 4.2.33 CLEAN and INSPECT elevating handle mechanism as follows:
a.
Using approved cleaning solution and low-lint cloth, CLEAN elevating handle mechanism.
b.
E black contact grease is installed on slide and pivot l
locations, using approved solvent and low-lint cloth or l
wooden scraper, REMOVE black contact grease.
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c.
APPLY thin layer of D6A15A1 grease or Mobilgrease 28 to slide and pivot.
d.
INSPECT cicvating handle mechanism for loose or missing 3
j hardware.
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e.
ENSURE elevating handle mechanism operates smoothly l
v without binding.
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4.2.34 RECORD elevating handle mechanism inspection results on l
Maint. Form 772.6-1.
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4.3 Primary Disconnect Penetration Measurement and Adjustment-
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Preferred Method l
C A UTIO N l
In the following step, elevator motor travels fully and stops by itself.
Motor must not be stopped prematurely.
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NOTE l
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1.
This section may be used when the cubicle is energized or deenergized.
i 2.
The interlock roller-to-flag dimension is critical. All other elevator mechanism adjustments are dependent upon this dimension. Care should be used in obtaining the interlock roller-to-flag dimension.
4.3.1 IE not previously performed, INSTALL circuit breaker in cubicle and electrically RAISE to connected position.
l 4.3.2 Refer To Figure - 1, and MEASURE dimension "X" between bottom ofinterlock roller and top of flag.
l Interlock Plate Interlock Roller
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Dimension "X" U/16 to /8 nch) 1 i Flag Figure - 1. Interlock Roller-to-Flag Dimension 4.3.3 RECORD dimension "X" on alaint. Form 772.6-1.
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V MP 772.6 Level of Use Rev. 3 i
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l
NOTE The flag device is~ not to be adjusted at any time. This device is set to the proper dimension at the factory or by GE field representatives.
4.3.4 E dimension "X," recorded in step 4.3.3,is less than /16 nch OR 1
i 1 i greater than /8 nch, PERFORM the following adjustment:
l a.- LOWER circuit breaker to tracks and REMOVE circuit j
breaker from cubicle.
b.
Refer 'Ib Figure - 2 and ADJUST upper limit switch (mercury switch) as follows:
l E dimension "X," recorded in step 4.3.3, is less than /16 1
=
inch, LOOSEN mounting hardware on upper limit switch i
and POSITION switch slightly upward to raise circuit breaker elevation.
l i
l E dimension "X," recorded in step 4.3.3, is greater than l
1 i
/8 nch, LOOSEN mounting hardware on upper limit
(
switch and POSITION switch slightly downward to lower -
circuit breaker elevation.
1
/
i' cL Breaker Lifting Bracket (Raised Position) b (x
Breaker Lifting Bracket EE S ic i
l (Intermediate Position)
~
Figure - 2. Upper Limit Switch i
c.
ENSURE upper limit switch mounting hardware is tight.
l b
Level of Use
,a~
/-
v MP 772.6 General
.ACT REVIEv Rev. 3 STOP' THINK
&(
22 0f 58 q
J l.
i d.
Go To step 4.3.1.
l
, r3 lh C AUTION l
l If the breaker is closed, the elevator clutch handle will not engage the l
elevator motor.
NOTE The following inspection checks that circuit breaker cannot be lowered when it is closed. The circuit breaker shall not physically be closed when 3erforming this check. Holding the interlock roller in place simulates the
]reaker set to the closed position.
4.3.5 With inteilock roller manually held in place, ATTEMPT to pull clutch handle back and PERFORM the following:
VERIFY clutch does not engage elevator motor.
VERIFY motor switch does not operate.
=
. O
!V 4.3.6 IE inspection results are not satisfactory, CONSULT FLS or Engineering for further direction 4.3.7 RECORD elevator motor engagement inspection results on Maint. Form 772.6-1.
l 4.4 Primary Disconnect Penetration Measurement and Adjustment-l Alternate Method (Optional) i
)
STOP WARNING STOP s
/
i l
Severe injury or death may occur during the following steps if the 4KV bus or load is energized.
i l
4.4.1 ENSURE bus and load are deenergized, tagged out, and grounded.
1 4
A OV i
MP 772.6 I Level of Use
. REVIEW Rev. 3
'STOP' THINK
-ACT~
Generai 23 0f 58
i
!/7 i
NOTE G
When making measurements for disconnect gap, and GE D50H119 filler i
compound or Solarite KM 1592 is not available, any industrial grade of Ductscal:nay be used. However, special attention must be paid to l
. cleaning disconnects and fingers after measurements.
4.4.2 APPLY small amount of Solarite to end of each primary disconnect bushing on circuit breaker.
4.4.3 APPLY an even coating of D6A15A1 grease or Mobilgrease 28 to primary disconnect contact balls on circuit breaker.
4.4.4 INSTALL circuit breaker and electrically RAISE circuit breaker l
to connected position.
l 4.4.5 LOWER circuit breaker to tracks and REMOVE from cubicle.
4.4.6 VERIFY each segment of stationary disconnect device made heavy impression in lubricant on contact ball.
4.4.7 Canfully CUT section of Solarite and EXPOSE cross section of one or two segments showing primary disconnect gap.
4.4.8 Refer To Figure - 3 and MEASURE exposed primary disconnect gap (s).
i Stationary Disconnect Segment Impression\\
]
h s
N x
X t
Solarite Primary disconnect gap Cross Section (Greater than or f
equalto /8 nch) 1 i Herkolite Bushing Figure - 3. Primary Disconnect Gap 4.4.9 RECORD primary disconnect gap measurements on Maint. Form p
772.6 - 2.
MP 772.6 t
Level of Use
~ACT REVIEW Rev. 3
~L-STOP-THINK' General 24 of 58 l
l
.=
i i
=
l*.
'4.4.10 IE one or more primary disconnect gap measurements is less than 1
i
/8 nch, PERFORM the following:
ADJUST upper limit switch (mercury switch) as follows:
- a. -
- 1) LOOSEN mounting hardware and POSITION switch slightly downward to lower circuit breaker elevation.
- 2) TIGHTEN switch mounting hardware.
b.
Go To step 4.4.2.
2 i 4.4.11 lE gap measurements are greater than or equal to /8 nch, RECORD as-left re:iult as " SAT" on Maint. Form 772.6-2.
4.4.12 Refer To Figure - 4 and MEASURE distance from top edge of.
i each primary disconnect contact ball to top of closest wipe and RECORD measurements on Maint. Form 772.6-2.
Greater than or 1 i l
equal to /8 nch.
l 3
n:ygg
_ u.; ivmV!
Wipe closest to L
top of ball l
Figure - 4. Primary Disconnect Ccmtact Ball Wipe i
1 i 4.4.13 IE any measurement, recorded in step 4.4.12 is less than /8 nch, PERFORM the following:
a.
Refer To Section 4.5 and PERFORM primary bushing finger adjustment and OPEN finger (s) as necessary.
b.
Go To step 4.4.12.
i i.
lO MP 772.6 j
Level of Use l
General
,* P l*
L^ T,, " F Rev.3 e ~,
25 of 58 o
- ~
I
.-h NOTE i U 1 i 1.
All contact ball wipe widths must be greater than or equal to /8 nch.
2.
Uneven contact ball wipe width may indicate that primary bushings l
need adjustment.
4.4.14 Refer To Figure - 5, and for each primary disconnect contact ball, visually DETERMINE the thinnest contact ball wipe (smallest wipe width).
Thinnest Wipe
/
4f0 l
l I
Greater than or._
1 equal to /g inch i
r l
l
, r Figure - 5. Primary Disconnect Contact Ball Wipe Width Measurement L
4.4.15 For each contact ball, RECORD width measurement for the thinnest wipe on Maint. Form 772.6-2.
4.4.16 1E contact ball wipes are wider on one side of contact ball than l
the other AND other contact balls have same problem on same side, Refer To Section 4.7 and PERFORM primary bushing alignment.
1 i 4.4.17 IE any contact ball wipe width is less than /8 nch AND there is no distinct pattern to suggest a primary bushing alignment j
problem, PERFORM the following:
a.
Refer To Section 4.5 and PERFORM primary bushing finger adjustment and CLOSE finger (s) as necessary.
)
b.
Go To step 4.4.14.
c.
IE contact ball wipe widths cannot be corrected, CONSULT FLS or Engineering for direction.
MP 772.6 Level of Use THINK ACT REVIEW Rev. 3
.~
General ST P~
j 26 of 58 i
l
i.
l-i
- (~N NOTE U
If lubricant in Figure pressure lines or finger patterns do not conform to those shown 6, they must be corrected using the bushing finger abgnment tool.
J l
4.4.18 Refer To Figure - 6 and visually INSPECT lubricant pressure lines length and pattern on inside of stationary disconnect segments.
l 1.ubricant Stationary Disconnect I.ubricant Pressure Segment Line (3 i
/8 nch min.)
Contact 13ali e
~
[ }ll
--g.-----
\\
Final l
E s
w contact u v v v v v v v point
/
A B
C A
B Ideal Penetration Misaligned Segments Imoroner Penetration
{
l Penetration equalon A No contact at final A Penetration too all segments contact point great I(
Good contact at upper B Insufficient contact at B Penetration too (j
cnd of pressure line final contact point short C No contact Figure - 6. Primary Disconnect Lubricant Pressure Line 4.4.19 COMPARE lubricant pressure line length and pattern with criteria in Figure - 6 and RECORD finger pattern inspection result on Maint. Form 772.6-2.
4.4.20 IE finger pattern indicates misaligned segments OR lubricant 3
pressure line is less than /s inch, PERFORM the following:
Refer 'Ib Section 4.5 and PERFORM primary bushing finger a.
adjustment and ADJUST fingers for affected bushing as necessary.
b.
Go To step 4.4.19.
C,')
MP 772.6 t
Level of Use STOP
' THINK' ACT "REVIEV/
Rev. 3 General 27 0f 58 l
l
i
{
NOTE FLS may suggest elevator lifting bracket adjustment be performed per Section 4.6 when finger pattern cannot be prope:
,djusted.
' IE finger pattern cannot be properly adjusted, CONSULT c.
FLS or Engineering for further direction.
NOTE Special attention must be paid to cleaning disconnects and fingers after measurements.
l i
4.4.21 REMOVE all Solarite from bushing and stationary disconnect l
fingers.
L 4.4.22 ENSURE all Solarite is removed from bushing.
i 4.5 Primary Bushing Finger Adjustment i
J C A UTIO N l
\\
Finger adjustments can only be done safely in switchgear that is deenergized and grounded on both bus and line sides.
NOTE i
1 The following section is performed as specified by other portions of the procedure. The bushing finger alignment tool is a special GE tool or similarly fabricated tool.
4.5.1 VERIFY breaker is removed.
4.5.2 On cubicle to be worked, VERIFY both bus and line sides are deenergized and grounded.
l 4.5.3 Using bushing finger alignment tool, Refer To Figure - 7 and l
SPREAD primary bushing fingers as necessary.
b
+
MP 772.6 Level of Use
~ NV}EVT Rev. 3
,, W 4
~
Td s
R General f4 28 of 58
~'
l
ll.
~
v y
i-l
(
~
~
g y
y LM' Push toolin this yD l
Push tool in this direction to OPEN
@ L direction to 7
'i fingers CLOSE fingers Figure - 7. Bushing Finger Alignment Tool 4.5.4 APPLY heavy coat of D6A15A1 grease or Mobilgrease 28 to l
contact balls.
1 4.5.5 INSTALL breaker.
l l
4.5.6 Manually RAISE circuit breaker.
l-4.5.7 Manually LOWER circuit breaker to tracks and REMOVE from l []
cubicle.
! V 4.6 Elevator Lifting Bracket Adjustment (Optional) l NOTE 1.
This section is normally performed upon direction of FLS or Engineering.
l 2.
This section is normally performed with the bus deenergized. If the bus is energized the FLS must be informed prior to starting this section.
4.6.1 IE not previously performed, LOWER circuit breaker to tracks and REMOVE from cubicle.
1 4.6.2 IE left side elevator lifting bracket is /g inch higher than right side bracket AND pressure lines are higher on left side of contact l
balls, CONSULT GE or Engineering for further direction (left side lifting bracket adjustment cannot be performed).
- O
\\~#
3 MP 772.6 Level of Use
.?
L General VP
'NK ACT REVIEW Rev. 3 l
p '-
29 of 58 i
I i
l I'
4.6.3 E left side elevator lifting bracket is /8 nch lower than right side 1 i l - [\\ -
9 bracket AND pressure lines are higher on right side of contact l
balls, CONSULT GE or Engineering for further direction (left side lifting bracket adjustment cannot be performed).
NOTE Normally, the Icft side lifting bracket is adjusted up or down to achieve a
' level lift l
4.6.4 E necessary, PERFORM left side adjustment as follows:
E either line or bus is ungrounded, INSTALL Plexiglass
)
a.
shutter barrier.
b.
REMOVE elevator motor.
1 c.
LOOSEN drive chain idler assembly.
1 i
d.
E drive chain idler assembly is dirty AND needs lubricating, OBSERVE how it is assembled and REMOVE drive chain j
idler assembly.
O e.
E drive chain idler assemblywas removed, using D6A15A1 grease or Mobilgrease 28, CLEAN and LUBRICATE all disassembled parts.
NOTE i
Chain cannot be moved by hand when anti-creep mechanism engages.
f.
PULL drive chain and ENSURE anti-creep mechanism of l
clutch is engaged.
i' L
LOCATE and REMOVE master link of drive chain.
l g.
h.
REMOVE drive chain from gears.
i._ -
MP 772.6 Level of Use
..n._.
..~
m.
General sTor AcT-neview Rev. 3 r
~'-g 30 of 58
l*.
1 i n L
i.
PERFORM applicable action:
V E pressure lines are higher on right side of contact balls, TURN left jackscrew as necessary to LOWER left side 1
i l
lifting bracket /16 nch.
E pressure lines are higher on left side of contact balls, TURN left jackscrew as necessary and RAISE left side 3
1 i
lifting bracket /16 nch, j.
Using D6A15Al grease or Mobilgrease 28, CLEAN and LUBRICATE drive chain.
k.
Loosely INSTALL idler assembly.
1.
INSTALL drive chain,
- m. INSTALL master link.
NOTE L
Drive chain must be tightened with a sli and down excessively when operating. ght play, but it must not bounce up l
l.
n.
While pushing up on idler assembly, TIGHTEN idler assembly.
o.
E installed, REMOVE Plexiglass shutter barrier.
p.
INSTALL elevator motor.
. NOTE Heavy and uniform coats of grease on contact balls make it easier to see
' contact ball wipes.
i q.
APPLY uniform coat of D6A15A1 grease or Mobilgrease 28 to all circuit breaker contact balls.
r.
INSTALL breaker into cubicle.
e A
MP 772.6 Level of Use.
.. N
.r -
' ST P ~
THINK 4ACT?
~ REVIEW Rev. 3 General g."
' "W
[$
31 of 58
1 i
/^\\
i j' Q STOP WARNING STOP i
l Racking breaker up with Plexiglass shutter barrier installed can result in i
i personal injury and equipment damage.
l l
4.6.5 Electrically RAISE breaker until there is approximately a 1 -inch i
i gap between female and male portions of secondary disconnect.
4.6.6 REMOVE elevator motor and INSTALL manual elevator crank.
J 4.6.7 Using manual crank, ATTEMPT to raise circuit breaker to within 1 s inch of stop pin engagement.
/
h 4.6.8 IE circuit breaker is very difficult to raise in the last 1 inch of travel, PERFORM the following:
a.
LOWER circuit breaker.
b.
Visually EXAMINE contact balls and DETERMINE if l
pressure lines are level.
i
[v]
c.
JE pressure lines are not level, REPENT Section 4.6.
l 4.6.9 REMOVE manual elevator crank.
4.6.10 INSTALL elevator motor.
4.6.11 LOWER circuit breaker to tracks and REMOVE circuit breaker from cubicle.
I l
4.6.12 OBSERVE contact ball wipe for each ball.
4.6.13 IE wipe is not level around all contact balls, REPEAT Section 4.6.
i l
i O
O MP 772.6 Le el of Use OP NK ACT REVdW Rev. 3 j
eneral 32 of 58
.c
4.7 Switchgear Primary Bushing Alignment (Optional)
- 3a sToP WARNING STOP Bushing, alignments can only be done safely in switchgear that is deenergized and grounded on both bus and line sides.
NOTE Engineering approval and direction is necessary to perform the following section.
4.7.1 REQUEST guidance from Engineering for new bushing position.
4.7.2 On cubicle to be worked, VERIFY bus and line side are deenergized and grounded.
4.7.3 IE not previously performed, REMOVE top and front access panels from cubicle.
O i
4.7.4 MARK position (outline) of bushing on cubicle to be used as a V
teference for moving the bushing later.
4.7.5 Using impact gun or other suitable tool, LOOSEN primary i
bushing mounting bolts.
4.7.6 REMOVE PVC boots from bus joints that must be loosened,.
4.7.7 IE necessary, LOOSEN bus joint hardware to free up bushing.
4.7.8 POSITION bushing relative to reference mark as required and TIGHTEN mounting bolts.
4.7.9 APPLY heavy coat of D6A15A1 grease or Mobilgrease 28 to breaker contact balls, l
l N
a STOP
-.. '. ~...
?
MP 772.6 Level of Use
. THINK ACT REVIEW Rev.3 General
-9 4
33 0f 58 s
1
'~
4.7.10 Manually RAISE circuit breaker until circuit breaker plunger to 1 i t
auxiliary switch rod gap is "not touching" to /8 nch.
U Plunger Auxiliary Switch Rod A
N/
153 Plunger to rod gap 1
2-4h C
v l w i
d/
\\
t,
,/
l 3
i O
m Figure - 8. Plunger to Auxiliary Switch Rod Gap Measurement 4.7.11 Manually LOWER circuit breaker to tracks.
NOTE 1
Measurement must be greater than or equal to /g inch between top of contact ball and top of all wipes.
4.7.12 Refer b Figure - 9 and MEASURE distance from top edge of all contact balls to top of wipes.
(~\\
MP 772.6 Level of Use sToe" misi<
AcT
'navis#
Rev.3 General 34 of 58
L'.
(
)
NOTE 1
l 1.
Contact ball wipe widths must be /g inch or greater.
l 2.
Uneven ccntact ball wipe width may mean that primary bushings need adjustment.
'4.7.13 Refer To Figure - 9 and MEASURE contact ball wipe
+
1 widths.
Greater than or l
equal to /g inch.
1 Wipe Greater than or _
equal to /g inch.
N 1
Wipe Width i
l f)
Figure - 9. Contact Ball Wipe v
4.7.14 IE contact ball wipes are not satisfactory, PERFORM one of the following:
Go To step 4.7.4.
l l
IE it has been determined that primary bushing alignment is correct AND contact ball wipes are not satisfactory, Refer To Section 4.5 and PERFORM primary bushing finger adjustment.
l 4.7.15 Refer To torque values in Attachment 3, and TORQUE l
previously loosened bus bolts.
4.7.16 For each joint that was loosened, PERFORM the following:
a.
RECORD ductor serial number and calibration due date on Maint. Form 772.6-2.
f%
i\\U MP 772.6 Level of Use
...THINK ~
iACT~
REVIEW Rev. 3 STOP' General.
1 a
35 0f 58 1
l J
, "!pm b.
DUCTOR each joint and RECORD as-left value on Maint.
1-Form 772.6-1.
U 1
c.
IE ductor reading is greater than 5 microhms, LOOSEN bolts and Go To step 4.7.15.'
4.7.17 INSTALL PVC boots.
4.7.18 ' INSTALL access panels.
4.8 Operational Checkout, Interlock Roller and Auxiliary Switch Adjustments NOTE Maintenance Form 772.6-1 provides a checklist for the following mspection.
4.8.1 Elec'rically RAISE circuit breaker to connected position and i
VERIFY the following:
)
1 i Motor cut-off switch operates during last /4 nch of vertical l travel.
. g Clearance between bottom of positive interlock roller and
=
interference plate (flag) is between /16 and 1/8 inch.
l 1
l Cradle provides a level, horizontal lift of breaker to elevated
=
position.
Using feeler gages, INSPECT stationary auxiliary switch rod l
and circuit breaker plunger are not touching and gap is not 1
greater than /s inch.
Secondary disconnects engage and have a gap of 1/g inch or less at the widest point. It is acceptable for connector pins to be visible.
l.
4.8.2 1E positive interlock roller clearance is not between /16 and 1/8 1
l inch, Refer To Section 4.3, and ADJUST clearance as necessary.
b 4
MP 772.6 Level of Use s
STOP" THINK i ACT REVIEW Rev.3 general v
4
/. '(
36 of 58 l
l
D NOTE t y 1
t 1 i Interlock roller to flag dimension must be /16 o /8 nch before performing the followm, g step.
4.8.3 E stationary auxiliary switch rod and circuit breaker plunger are 1 i touching DJ1 gap is greater than /8 nch, ADJUST stationary auxiliary switch plunger gap as follows:
l a.
MEASURE auxiliary switch plunger gap.
b.
Electrically LOWER circuit breaker to tracks.
c.
REMOVE circuit breaker from cubicle d.
PERFORM applicable action to adjust gap:
E rod and plunger are touching, REMOVE shims until l
clearance is between 1 1
/16 and /g inch.
1 E auxiliary switch plunger gap is greater than / inch, l
' ADD shims until clearance is between 1/16 and /s inch.
b)'
V i
e.
INSTALL circuit breaker in cubicle.
1 f.
RAISE circuit breaker.
g.
MEASURE auxiliary switch gap as follows:
- 1) PULL circuit breaker approximately 1 inch out of l
cubicle.
i
- 2) PULL and HOLD clutch handle.
1
- 3) MEASURE overlap in interference blocks and RECORD inspection results on Maint. Form 772.6-1.
- 4) E interference blocks do not overlap a minimum of 3fg inch, CONSULT FLS.
i 1
h.
Go To step 4.8.3.a.
- C MP 772.6 L
Level of Use
.~sm[
ym y
TEqEw Rev. 3 l
General 3
t 37 of 58
l~
4.8.4 IE gap /g inch, PERFORM the following adjustment:betw O
than v
a.
LOWER circuit breaker to tracks and REMOVE from
' cubicle.
b.
INSPECT for hardened grease in female secondary disconnect contacts.
i c.
Using non-conductive swab, APPLY light coating of D6A15A1 grease or Mobilgrease 28 to female secondary disconnect contacts.
d.
Using brush or rug, APPIX light coating of_ D6A15A1 grease or Mobilgrease 28 to male secondary disconnect contacts.
l e.
INSTALL circuit breaker in cubicle, f.
RAISE circuit breaker, j..
i.
s I
I L
l l
3 4,n!b i
J.
MP 772.6 Level of Use m-m.
- f Rev. 3 Generai THINK s ACT..
REVIEv
~STOP^
pc y3 38 of 58
1 l
l*
\\
i l*Qp 1 i Using /8 nch gap gage, INSPECT gap between secondary g.
l disconnect connector blocks.
l Secondary disconnect female side
/
n v 8
u t
A
{j, 2
- 3Es 1
/
Connector gap C
O
\\
/
\\
WHI in!
o f
I i
/
14_
1. (m)
Secondary
/.
disconnect male side I
I i
Figure - 10. Secondary Disconnect Gap Measurement C A UTIO N A hammer or other tool must not be used to strike top of upper contact block metal cover.
1 i E gap is greater than /8 nch, using gloved fist, manually h.
STRIKE top of upper contact block metal cover one or two times.
l i.
E gap cannot be adjusted satisfactorily, Refer To Section 4.10, and perform secondary disconnect gap adjustment.
' O MP 772.6
- ~.
'4 Rev. 3 i
Level of Use
' STOP ' '
THi,NK
'ACT' REVIEW Gener i 39 0f 58 l
I 4.9 Stop Pins and Stop Iloits Clearance Measurement and Adjustment V
NOTE l
l Interlock roller to flag dimension must be /16 o /g inch before 1
1 t
performing the following step.
i 4.9.1 E not previously performed, Refer To Section 4.3 and MEASURE and ADJUST interlock roller to flag dimension as necessary.
4.9.2 LOWER circuit breaker.
4.9.3 INSTALL small pieces of Solarite onto heads of stop pins and stop bolts.
l 4.9.4 POSITION circuit breaker in cubicle and RAISE circuit breaker l
to connected position.
4.9.5 LOWER circuit breaker to tracks.
l l
4.9.6 MEASURE thickness of Solarite on stop pins and stop bolts and i
DETERMINE clearance.
3 4.9.7 E clearance is not between /32 and 1/s inch, PERFORM the following:
a.
ADJUST stop pins or stop bolts as necessary.
l b.
Go To Step 4.9.3.
l l
4.9.8 RECORD inspection results on Maint. Form 772.6-1.
l 4.9.9 REMOVE all Solarite from stop pins and stop bolts.
i l
4.10 Secondary Disconnect Gap Measurement and Adjustment (Optional) 4.10.1 IE not previscusly performed, Refer To Section 4.8, and PERFORM operational checkout.
4.10.2 POSITION circuit breaker in cubicle and electrically RAISE circuit breaker to connected position.
O M P 772.6 Level of Use
.nsvie T Rev. 3 g
General 40 of 58
i.
4.10.3 At widest portion of gap, MEASURE gap between secondary l
)
contact disconnect blocks.
1 i 4.10.4 LE gap measurement is greater than /8 nch, PERFORM the following:
j Using gloved fisted hand, STRIKE top of cubicle-mounted a.
secondary contact disconnect block once or twice.
b.
At widest portion of gap, MEASURE gap between secondary disconnect blocks.
1 i c.
LE gap measurement is greater than /8 nch, PERFORM the following:
- 1) REMOVE secondary disconnect cover.
- 2) LOOSEN cubicle-mounted secondary disconnect mounting bolts.
- 3) Using soft-mallet hammer or hand, TAP cubicle-mounted secondary disconnect into contact with circuit breaker secondary disconnect and COMPRESS r'^3 springs on cubicle-mounted secondaiy dis onnect
't )
approximately 1/8 inch.
- 4) TIGHTEN mounting bolts.
- 5) INSTALL secondary disconnect cover.
- 6) LOWER and RAISE circuit breaker
- 7) Go To step 4.10.3.
4.10.5 RECORD inspection results on Maint. Form 772.6-2.
l 5
i l
l i
/--
i'"
Level bi Use
' THINk.
. REVIEW ~.
Rev. 3 MP 772.6 STOP' ACT (sseneral 41 of 58
l'
'n 4.11 Transformer Rollout Cleaning and Inspection (Optional) l U
STOP WARNING STOP 1
Severe injury or death may occur during the following steps if the 4KV bus or load is energized.
4.11.1 IE necessary to clean transformer drawer slides OR adjust primary contact fingers, REMOVE transformer drawer, as necessary.
4.11.2 ENSURE bus and load are deenergized, tagged out, and grounded.
4.11.3 REMOVE access covers as necessary, and OBTAIN access to transformers.
l ALARA Use of a vacuum cleaner in contaminated areas should be with the consent lV CT of the Health Physics Department.
l 4.11.4 Using an approved cleaning solution, low-lint cloths, and vacuum cleaner, CLEAN the following:
Potential and grounding transformers Primary disconnects Secondary disconnects Transformer drawer slides l
l
{
l i
i (O
MP 772.6 i
Level of Use
.STOP THINK
'ACT -
REVIEW Rev. 3 n-eneral 42 of 58
/^)
NOTE Maint. Form 776.2-2 provides a checklist for the following inspection.
4.11.5 INSPECT transformers and disconnects for the following:
Excessive dirt Damage Cracking Tracking 4.11.6 ENSURE mounting and structural hardware are tight.
)
4.1 L7 ENSURE electrical connections are tight.
4.11.8 Using D6A15A1 grease or Mobilgrease 28, LUBRICATE primary
)
and secondary disconnects on potential and grounding transformer rollouts.
l 4.11.9 IE tagging allows, ENSURE satisfactory wipe on primary and secondary disconnects, located on the rollout, as follows-1 I
SLIDE transformer rollout into normal position.
a.
1 b.
SLIDE transformer out.
c.
INSPECT grease marks on disconnects show at least % inch or greater of contact wipe.
d.
IE contact wipe is not at least % inch, BEND fingers as necessary, and Go To step 4.11.8.
e.
IE transformer rollout did not slide smoothly, using D6A15A1 grease or Mobilgrease 28, LUBRICATE rollout wheels.
l 4.11.10 VERIFY star washers installed between transformer feet and rollout tray.
4.11.11 INSPECT primary cables for proper support.
i O
4 MP 772.6 Level of Use "STOP" ThlNK iACT REViEVf Rev. 3 General 43 of 58
_. ~.
.. ~...
J t
~
[
4.11.12 IE cables are not properly supported, CONSULT FLS for further
\\s).
instruction.
t
\\
J 4.11.13 ENSURE smooth operation of rollout tray and latching l
mechanism.
l 4.11.14 Refer To Figure - 11 and INSPECT potential transformer i
barrier assembly for the following:
l Signs of arcing or overheating l
Proper location i
i l
Mounting hardware tightened L
i l.
l J
l Potential Transformers 1 in.
l 21
/ in.
2 F_
F 4
J m
i i
i i
(3 i
s si i
n ll lV
{__]
o
{"_ _ ]
/ in.
2 14 in.
4 in.58 11/ in.
4 v
v Barn.er 9
l 21/2 in.
L 1 in.
L.
Figure - 11 Potential Transformer Phase Barrier 4.11.15 RECORD inspection results on Maint. Form 772.6-2.
j l
4.11.16 1E inspection results are not satisfactory, CONSULT FLS for further instructions.
l i
t
( b)
L
- V MP 772.6 Level of Use g.
g
,ggg g,y, 3 General i
=4 44 of 58 7
1 f
4.12 Bus Connection Cleaning and Inspection (Optional) l j
STOP WARNING STOP i
Severe injury or death may occur during the following steps if the 4KV bus or load is energized.
4.12.1 ENSURE bus and load are deenergized, tagged out, and grounded.
{
4.12.2 REMOVE front, top, and rear cubicle access covers.
l 4.12.3 Visually INSPECT all insulation for the following:
Signs of overheatmg i
i
. Signs of tracking Cracks or damage 1.
-4.12.4 INSPECT primary disconnect porcelains for cracks.
D 4.12.5 RECORD visual inspection results on Maint. Form 772.6-2.
4.12.6 Randomly SELECT and REMOVE rubber boot from a bus joint on each cubicle, alternating phases at each cubicle.
i l
NOTE l
l Tape-wrapped connections are not to be unwrapped at this time.
l 4.12.7 Refer To Attachment 3, and using torque wrench, VERIFY tightness of the bolts for the randomly selected joint (s).
4.12.8 RECORD torque inspection results on Maint. Form 772.6-2.
I l
Level of Use MP 772.6
~-
~ STOP' THINK ACT
' REVIEW Rev.3 eneral p
.g 45 of 58 I
1 l
ll' 4.12.9 E visual or torque inspection results are not satisfactory, CONSULT FLS and Engineering and PERFORM the following i
on bus as directed-i 1
STOP WARNING STOP i
l Bus connections with tape wrap (" taped connections") may contain an asbestos duct seal compound. Tape or Ductseal compound is not to be l
touched or handled until Industrial Hygienist from Safety and Health Department has been contacted.
a.
REMOVE the following from applicable bus connections:
)
Sleeving Tape insulation (fiberglass and irrathane) l 1
PVC hoots
=
l
+
b.
E bus connection is to be torqued, PERFORM the j
j following-L ex
- V i
NOTE 1.
Bus connection insulation may contain asbestos. To prevent injury to ersonnel, asbestos must be handled in accordance with U1 WC 1 p(Att),"Contial of Asbestos Containing Materials."
2.
Prior to removing bus connection insulation, Safety and Health Department must be consulted.
- 1) E bus connection is taped, REQUEST Safety and l
Health Department to provide instructions for Ductseal l
removal, and REMOVE Ductseal.
- 2) RECORD ohmmeter serial number and calibration due date on Maint. Form 772.6-2.
l
- 3) DUCTOR across bus connection.
- 4) RECORD as-found ductor value on Maint. Form 772.6 - 2.
]
q
- 5) LOOSEN all bolts of bus connection.
MP 772.6 Level of Use
.-THINK '.
ACT.... REVIEW Rev.3
~ST P~
General 46cf58 rw
l l-i
- 'g)
- 6) Lightly APPLY D50H109 or other approved joint l!
- compound to bus connection.
l
each bolt of bus connection.
L
- 8) Using ohmmeter, DUCTOR across bus connection.
l
- 9) RECORD as-left ductor value on Maint. Form 772.6 - 2.-
I l
- 10) E as-left ductor values aregreaterthan 5 D, CONSULT FLS or Engineering for further direction.
I 4.12.10 CLEAN and 1NSPECT insulating boots as follows:
C AUTIO N 1
Damage to insulation may occur if No.yl/Lexan or Baybend bus sleeving is cleaned with solvents. Only denatured alcohol should be used for cleanmg.
O a.
Using denatured alcohol and low-lint cloth, CLEAN
'V insulating boot.
b.
E boot cannot be cleened, REPLACE boot.
l
. c.
INSPECT boots for cracking or damage, d.
E necessary, CONSULT FLS and REPLACE insulating l
boots, as necessary.
i 4.12.11 RECORD insulating boots inspection results on Maint. Form 772.6 - 2.
l 4.12.12 E removed, INSTALL sleeving, Ductseal, and tape insulation 1
(fiberglass and irrathane) or boots to bus connections.
i O
i V
A A
MP 772.6 4
f Level of Use o
m l
Generai ST P THINK
}ACT R,EVI W Rev. 3 m
470f58 1
x
i.
i
]
ALARA Use of a vacuum cleaner in contaminated areas should be with the consent -
+
of the Health Physics Department.
i 4.12.13 Using vacuum cleaner as necessary and low-lint cloths, CLEAN 1
compartment interior.
i C A UTIO N i
j Damage to insulation may occur if Noryl/Lexan or Baybend bus sleeving is cleaned with solvents. Only denatured alcohol should be used for cleamng.
4-I 4.12.14 Using approved cleaning solution and low-lint cloths, CLEAN the following:
i i
Buswork
)
Buswork supports 2
Current transformers Porcelain insulators
)
j
]
f' Secondary wiring i
i l
i
)
i MP 772.6 Level of Use
'STOP' THINK Rev. 3
'ACT' REVIEW General Ps 48 of 58
. - - _ - -. -. ~. - -. - -
NOTE In the following step, damage includes cracking or splitting.
4.12.15 JE not previously performed, INSPECT the following for damage, trackm, g or overheating:
Bus sleeving Tape insulation a
i Insulating boots Buswork supports Cable insulation Current transformers l
4.12.16 IE Noryl insulation has minor cracks, using Irrathane tape, TAPE l
l as follows:
t I
One layer,2 to 3 lapped Tape extending 2 inches beyond crack and secured with Scotch 33 tape.
4.12.17 IE bus removal is necessary for repair purposes, PERFORM the following:
j NOTE Buswork supports and bus bars, with or without sleeving, may need to be removed together. Each item removed should be tagged to ensure proper placement upon assembly.
I a.
MARK and REMOVE the following:
l Damaged thermoplastic sleeving Damaged tape insulation i
=
Bus bar or bus support
- O
)'
A MP 772.6 Level of Use n_.
Generai STOf
~ TNINK
'ACT REVIEW Rev. 3 m
y.
490f58 l-
. =. -.
b.
REMOVE bolting hardware from each connection adjacent
( )
to component bem, g replaced.
v c.
REMOVE bus duct or bus supports as required.
C AUTION Do not use sandpaper or abrasive cleaners on silver surfaces of buswork.
These will destroy silver coating.
NOTE l
It is not necessary to remove all stains or tarnish from silver contact area l
when cleaning with solvent. FLS or Engineering should provide guidance in judging serviceability of a component.
i d.
Using approved solvent and low-lint cloth, CLEAN buswork joints.
e.
INSTALL thermoplastic sleeving.
(
~
b f.
Lightly APPLY D50H109 or approved joint compound to bus l
contact surfaces.
l g.
POSITION bus bar or support in location from which it was removed.
h.
Refer To Attachment 3, and TORQUE cach bolt of bus l
connection to corresponding value.
l i.
REMOVE excess grease from joint.
j.
IE excess grease is not expelled from the joint during l
torquing, DISASSEMBLE connection and REPEAT steps l
4.12.9.f. through 4.12.9.i.
k.
DUCTOR cach bolted connection torqued in step 4.12.9.h.
l 1.
RECORD ductor readings on Maint. Form 772.6-2.
l
- m. Using approved tape, TAPE bus joint.
MP 772.6 Level of Use
. THINK ACT
, EVIEW Rev.3 ST P
. General 50 of 58 l
s 4.12.18 Visually INSPECT primary disconnect porcelain bottles, t
!:f including visible portions of the pitch that fills porcelain, for cracks and chips.
1 4.12.19 IE inspection result is not satisfactory, using GE RTV-103 compound, FILL minor cracks and voids.
4.12.20 REMOVE all tools and equipment from bus compartments and cubicles and RECORD on Maint. Form 772.6-2.
4.12.21 Independently VERIFY all tools and equipment have been removed from bus compartment and cubicles and RECORD verification'on Maint. Form 772.6-2.
l L
4.12.22 ENSURE all debris has been removed from all switchgear
. compartments.
)
i 4.12.23 INSTALL all covers.
i 4.12.24 Unless front door is required to remain open for testing, CLOSE l
front door.
4.13 Post Maintenance Testing l
t i
STOP WARNING STOP
/
1 1
Severe injury or death may occur during the following steps if the 4KV bus or load is energized.
4.13.1 Refer To MP 772.2, "High Voltage Grounding 4160 Switchgear" l
and INSTALL bus side ground cart in cubicle.
1 NOTE Flash gear includes flash jacket, hardhat, face shield and high-voltage gloves.
o 4.13.2 DON flash gear and LIFT groundcart ground lead from any j
l-phase.
- O
. V 1
A q
A MP 772.6 i
Level of Use "THINK '. TACT'
' REVIEW Rev. 3 2.
^ST P' General I
<?q sg
)'
51 of 58 J
o c-
-n
,4 y
r
r I
C A UTIO N To prevent erroneous readings or damage to circuit breaker during l.
meggering of bus, circuit breakers must be disconnected from bus.
4.13.3. ENSURE all circuit breakers on the bus are racked down and l
disconnected.
NOTE Circuit breaker primary circuits are tested using a de megger at 5000 volts for one minute.
[
I 4.13.4 PERFORM insulation resistance test as follows:
j a.
RECORD megger serial number and calibration due date on Maint. Form 772.6-1.
b.
GROUND phases B and C, and MEGGER phase A to fS ground.
'O c.
GROUND phases A and C, and MEGGER phase B to l
ground.
d.
GROUND phast.s A and B, and MEGGER phase C to ground.
i l
e.
IE insulation resistance is less than 80 megohms, CONSULT FLS for further guidance.
4.13.5 RECORD ohmmeter serial number and calibration due date on Maint. Form 772.6-1.
l 4.13.6 DUCTOR each phase of bus duct and RECORD ductor readings l
on Maint. Form 772.6-1.
I I
4.13.7 IE ductor reading is greater than 0.005 milli-ohms (5pO),
CONSULT FLS for further instructions.
l 4.13.8 IE necessary, INSTALL circuit breaker in cubicle.
4
- O
+
MP 772.6 Level of Use
' THINK ACT REVIEW Rev.3 STOP' OOneral
~ m 52 of 58 I
i l*
l l
'n 4.13.9 IE circuit breaker is to remain on cubicle floor, INSTALL
(
i elevator handle latch.
i o
l O
V i
!(O v
MP 772.6 Level of Use STOP hilNK ACT
' REVIEW Rev.3 General 53 of 58
- 5. REVIEW AND SIGN-OFF D
l 5.1 The review and sign-off for this procedure is satisfied by the review and l
sign-off of the AWO and applicable Maintenance Forms.
. 6. REFERENCES 6.1
" Northeast Nuclear Energy Company Accident Prevention Manual" j
_6.2 Vendor Manuals 6.2.1 GEH-1802W, General Electric, " Metal-Clad Switchgear Types M26 and M36" L
6.2.2 GEF-4351C, General Electric," Renewal Parts Metal--Clad Switchgear Types M-26 and M-36" l
6.3 Administrative Procedures l
6.3.1 U1 WC 1, Unit 1 Work Control Process" l
l 6.3.2 WC 8," Control and Calibration of Measuring and Test Equipment"
- O
- l. U 6.3.3 CC 1," Control of Chemical Consumable Products" l
6.4 Maintenance Procedures 6.4.1 MP 772.2, "High Voltage Grounding 4160 Switchgear" 6.4.2 Vendor Procedure EMP-117," Medium Voltage Metal-Clad Switchgear Inspection and Insulation Replacement" 1
6.5 Other Documents l
6.5.1 Letter from S.J. Pasiuk, Industrial Hygenist, SJP96-021M, l
" Interim Guidance for Compliance with Asbestos Regulation and l
Procedure WC-1 During Work on 4160-Volt and 6900-Volt Breakers" 6.5.2 Letter from S.J. Pasiuk, Industrial Hygenist, SJP96-037M,
" Interim Guidance for Asbestos Control During the Removal of
. Ductseal" 6.5.3 EPRI," Preventive Maintenance Program Basis for Medium
(
Voltage Switchgear" 3
4 MP 772.6 Le el of Use g
,g7 g,y, 3 eneral-
~
f'
~
/ h, 54 of 58
l l
l lV
~
l( -
6.5.4 NMAC, " Circuit Breaker Maintenance, Volume 2: Medium Voltage Circuit Breakers, Part 2: GE Magne-Blast Breakers" 6.5.5 Installation and Service Engineering Service Advice," Type 4.16kV Vertical Lift Metalclad Switchgear Primary Disconnecting Device," No. 323.1
- 7.
SUMMARY
OF CHANGES L
7.1 Incorporated extensive Engineering Technical Review comments including l
major rewriting of some sections to update instructions to the latest GE l
practices.
l 7.2 Deleted Frequency section. Added Applicability section. Frequency section is only required if the procedure is a surveillance.
7.3 Revised Discussion section to reflect changes in procedure.
i 7.4 Added ALARA for use of vacuum cleaner.
l 7.5 Throughout procedure, added Mobilgrease 28 as the equivalent to GE 1
l D6A15A1 grease.
LA V
7.6 Removed cleaning of fuse blocks from Section 4.2. Block is usually energized and holder is cleaned.
7.7 Added new artwork to illustrate adjustments.
l 7.8 Incorporated previously PORC-approved Change 1 to Revision 2 regarding guidance for asbestos control during removal of Ductseal.
l 7.9 Added precaution and step to use elevator handle latch when breaker is stored on floor in cubicle in response to ACR M1-96-0845 and LER 96-057. See also Nuclear Safety Engineering OE Minute of November 7, 1996.
7.10 Updated References section to include supporting documents used as the basis for changes made during this revision.
7.11 Reorganized forms into two forms, one for normal PM tasks, and one for i.
optional tasks. Cancelled forms 772.6-3 through -6.
'l
'O MP 772.6 g
g' gy7 l
Le el of Use
..g. g g,y, 3 eneral
^
L f*
55 of 58 i
i
Elevating Mechanism Typical Switchgear (Sheet 1 of 1)
Terminal Blocks Gages and Indicators f
a %
~_
T lP
~
r i ~l l
1
/
si S chgear rJ!
\\
Handle b
J-
~
C 4
/
b s/
Circuit Breake/r
'/'
Secondary Cubicle-Mounted Disconnect Secondary q'
Disconnect
/s Circuit Breaker Plunger Ciccuit reaker A
MP 772.6 Level of USe gey 3 "STOP THINK
.ACT' REVIEW eeneral g.
g s
ll*.
i'a Elevating Mechanism Details i8 (Sheet 1 of 1) l [
i \\s Wer Gears Sprocket l
r __
_____7_
t d
u____2 l
S r,
Stop Bolt ll Stop Pin l
"" u
/
l ll I
I l
ll
{
l ll Jack Screw l
ll ll 4
Guido Rail l
Ufting Brackets l
(Cradle) ll IL~'
l l
Shutter i
m(v Il l
i r,
s ll
,_Et' _y _y___.____x i
- t. _
Ii 11
/l l
l ll ii li W
l ll lll lI
___l ll ll iii t i ii i
l ll ni ii ii i
s l
ll ui ll l
i i
11 i
!i
,i I
-llss i
o o
u li g
--+---
- c
-el ll ll l1 ll ii u.__9;____=_.n-l j
i ll
_q
==_
ll B
'8 ll l
It Ly L
Floor Line L
("%
b
~
i i
A MP 772.6 i
x Level of USe A
_!:u-SToP"s._.., $.1NK
-ACT*
REVIEW Rev.3 General
- ~
/ 4,
- -(
57 0r 58 e
4
}'
ps Attaclunent 3 C
Bus Connection Torque Values (Sheet 1 of 1)
A Torque (ftalb)
Bus connection with Bus connection with standard washer, standard washer, B lt Size lockwasher, nut, and prevailing torque lubed with D50H109 locknut, and lubed with D50H109 3/8 - 16 20 to 30 15 to 20 1/2 - 13 45 to 55 30 to 35 5/8 - 11 60 to 70 45 to 55 v
1 1
J A
i i
V 4
MP 772.6 o
Level of Use General g,z g7,4 ;gg7 g,y, 3
.ggg.
58 of 58 f
Q-rv:
e
-6lb t (-$~
l-W~D$$
Approval k3 Approval Date Effective Date PORC Mtg. No.
Metal-Clad Switchgear Type M-26 Inspection Checklist Component ID AWO step Component / Inspection Acceptance Criteria As-Found As-Left section 4.1. switchgear Exterior and Door Cleaning, Lubrication and Inspection switchgear externals clean, not 4.1.3 switchgear external surface damaged, and debris removed O sat O Unsat O sat O unsat from work area Instrument cover lenses None missing or broken O sat O Unsat O sat O unsat switch handles Handles not damaged O sat O Unsat O sat O Unsat Indicator light bulbs and lenses None broken or cracked O sat O unsat O sat O Unsat 4.1.4 Door alignment Line up evenly, no dragging O sat O unsat a sat O unsat Door-latching mechanism Properly latches door O sat O unsat O sat O unsat External paint Good condition, no flaking O sat O Unsat O sat O Unsat Door latch handle mechanism Lubricated O sat O Unsat O sat O U nsat Door catch at top of cubicle Lubricated O sat O Unsat O sat O u nsat 4.1.6 Captive screw threads at top of Lubricated O sat O Unsat O sat O unsat section 4.2. Cubicle Interior Cleaning and Inspection 4.2.5 Circuit breaker cubici Ost O unsat O sat 0 Unsat c nd tion o da age Clean, no signs of damage or 4.2.21 Control wiring overheating, no loose O sat O unsat O sat O unsat connections Maint. Form 772.6-1 Rev. 2 Page 1 of 4
c.
m ry
(/
V
()
Metal-Clad Switchgear1ype M-26 Inspection Checklist Step Component / Inspection Acceptance Criteria As-Found As-Left section 4.2. Cubicle Interior Cleaning and Inspection (Cont) 4.2.24 Terminal blocks Clean, no signs of damage O sat O u nsat O sat O Unsat Contact probes properly greased, n
gns o da age or acking' O sat O unsat O sat O Unsat 4.2.26 Fuse blocks and holders holders are tight in fuse block Clean, no loose or wiring or O sat O unsat-O sat O Unsat 4.2.28 Relays damage, securely mounted, tight-fitting covers O Not Required O Not Required Clean external surface, no loose d"
d' 4.2.30 secondary Disconnect hed co ta tl 0 sat O u nsat O sat O unsat tact not t properly greased i
Clean, no loose wiring or damage, position switch lever set O sat O Unsat O sat O unsat 4.2.32 switches screw is tight Tie bolts torqued to 25 (23 - 27)
O sat O unsat O sat O unsat m-lbs i
Clean, no loose or missing 4.2.34 Elevating handle mechanism hardware, smooth operation, O sat O unsat O sat O Unsat slide and pivot properly greased L
Maint. Form 772.6-1 Rev.2 Page 2 of 4
a p
tv V
U V-Metal-Clad Switchge:r 'lype M-26 Inspecti:n Checklist Step Component / Inspection Acceptance Criteria As-Found As-Left Section 4.3. Primary Disconnect Penetration Measurement and Adjustment-Preferred Method 4.3.3 Dimension "X" =
inch 92p%ypg%%%py,%%%%Qpyp%%%g2MGZp%%/,(
Elevator motor engagement with Elevator motor does not engage 4.3.7 clutch handle pulled fonvard and and motor switch does not O Sat O unsat Sat unsat interlock roller held operate Section 4.8.- Operational Checkout, Interlock Roller and Auxiliary Switch Adjustments i
" ng1 4 n h of O Sat Unsat Sat O unsat Motor cut-off switch operation e tical tm el Interlock roller and interference plate clearance O Check if positive interlock Between /16 and /8 nch O Sat unsat Sat unsat 1
I i adjustment was performed (Section 4.3) j Raises breaker to elevated 4.8.1 Cradle position, circiut breaker remains Sat Unsat Sat Unsat i
horizonta!!y level during.'ift Stationary auxiliary switch plunger gap Plungers not touching and gap Sat Unsat Sat unsai Check if stationary aux.h.i ary less than /8 nch 1 i switch adjustment was performed (step 4.8.3)
Isc ects engag d t ap O Sat O unsat O Sat unsat Secondary disconnects ye
'P O Sat O unsat Sat O unsat 4.8.3.g.3)
Measure Auxiliary Switch Gap m of / in t
Maint. Form 772.6-1 Rev.2 Page 3 of 4
-m.
- m....
mm.
im n
M
+
b U
V Metal-Clad Switchgear 'lype M-26 Inspection Checklist I
Step Component / Inspection Acceptance Criteria As-Found As-Left 4.9. Stop Pins and Stop Bolts Clearance Measurements and Adjustments f
Stop pins and stop bolts clearance 3
1 i 4.9.8 0 Check if stop pins /stop bolts Between /32 and /8 nch O Sat O unsat O Sat O unsat adjustment was performed (step 4.9.7) 4.13. Post Maintenance Testing Megger Serial No.
Calibration Due Date Megger phase A I
77 3 -
gg 4.13.4
'6'A.
.[,
p gg Megger phase B 0 to 5 O h,'l Megger phase C p
)
MR Ohmmeter Serial No.
Calibration Due Date Ductor phase A pg pg 4.13.6 Ductor phase B 0 to 5 Q pg pg Ductor phase C g
g l
Comments FLS Date l
Maint. Form 772.6-1 Rev. 2 Page 4 of 4
.l Y i
MQ 5 iz-h M/f-f7 147-O&I
~
i Approval Q
Approval Date Effective Date PORC Mtg. No.
Metal-Clad Switchgear1)pe M-26 Inspection Checklist (Optional)
Component ID AWO Step Component / Inspection Acceptance Criteria As-Found As-Left Section 4.4. Primary Disconnect Penetration Measurement and Adjustment-Alternate Method (Optional) in.
in.
in.
in.
/8 nch
'. n.
{n.
St Primary disconnect gap
>1 i
in.
in.
O Unsat in.
in.
in.
in.
4.4.9 in.
in.
Primary disconnect gap 1.
In.
in.
O Sat i
(This section provided for second 2 /8 inch i
i Ow check.)
m.
m.
in.
in.
Distance from top edge of contact in.
in.
1 O Sat ball to top of closest wipe (Primary 2 /g inch m.
m.
OUm disconnect contact ball) in.
in.
4.4.12 Primary disconnect contact ball O Sat wipe
>I/8 inch m.
in.
O Unsat (This section provided for second check.)
Maint. Form 772.6-2 Rev. 1 Page1 of4
n f
ij V
G' Metal-Clad Switchgear Type M-26 Inspection Checklist (Optional)
Step Component / Inspection Acceptance Criteria As-Found As-Left in.
in.
> l/8 nch uniformly St i
Primary disconnect contact ball in' in' in.
O U nsat wipe width around contact ball m.
4.4.15 Primary disconnect contact ball 2 /8 nch uniformly O Sat 1 i wipe width (This section provided for second around contact ball O Unsat check.)
Ideal penetration:
O Ideal penetration Stationary disconnect contact on Uniform wip '
MIS II "*d E
O Misaligned segments 4.4.19 bushmg ball (finger pattern) lubrication pressure h.
3 i O Improper ne of /8 nch minimum O Improper penetration penetration Step Component / Inspection Acceptance Criteria As-Found As-Left Section 4.7. Switchgear Primary Bushing Alignment (Optional)
Ohmmeter Serial No.
Calibration Due Date Ductor phase A
'/
[
[j//
pg Ductor phase B 0 to 5pR
/
pg Ductor phase C pg Section 4.10. Secondary Disconnect Gap Measurement and Adjustment (Optional)
Secondary disconnect gap 4.10.5 0 Check if gap adjustment was S /8 nch O Sat O Unsat O Sat O unsat l
I i performed (step 4.10.4) l Maint. Form 772.6-2 Rev. 1 Page 2 of 4
_ ~ - _ _ -. _ _ _ - _ _
(
f%
f~W V)
V d
Metal-Clad Switchgear'lype M-26 Inspection Checklist (Optional)
I step Component / Inspection Acceptance Criteria As-Found As-Left section 4.11. Transformer Rollout Cleaning and Inspection (Optional)
Transformer, primary and No signs of dirt or damage, n O sat O Unsat O sat O Unsat 4.11.5 secondary disconnects tracking or crack, g m
unting and structural Tight O sat O Unsat O sat O Unsat 4.11.6 4.11.7 Electrical connections Tight O sat O Unsat O sat 0 Unsat l
Primag and s condary Contact between disconnects O sat O Unsat O sat O Unsat 4.11.9 d
d et en ro 0 ra 4.11.10 star washers Ost O Unsat O sat. O Unsat and tran 9,
g 9 fcet
" I "8
Sm th operation O sat O Unsat O sat O Unsat 4.11.13 ccl isn Section 4.11. Transformer Rollout Cleaning and Inspection (Optional) (Cont) i No sigris of arcing or overheating O sat O Unsat O sat O Unsat Potential transformer barrier 41),g InstMled in proper location O sat O Unsat O sat O Unsat i
assembly 51ounting hardware tight O Sat O Unsat O sat O Unsat section 4.12. Bus Connection Cleaning and Inspection (Optional) f us insuladon, primary No signs of overheating, trackmg O sat O Unsat O sat O Unsat 4.12.5 disconnect procelams or damge, porcelam, not cracked Randomly selected bus Torqued in accordance with O sat O U nsat O sat O Unsat 4.12.8 connection (s) tightness Maint. Form 772.6-2
- Rev. 1 Page 3 of 4 i
mui.
+ -
r f%
W V
V 5
Metal-Clad Switchgearlype M-26 Inspection Checklist (Optional)
Step Component / Inspection Acceptance Criteria As-Found As-Left Ohmmeter Serial No.
Calibration Due Date Ductor phase A pg pg Ductor phase B 0 to 5 O pg g
4 Ductor phase C g
g Randomly selected bus Lubricated and torqued in O sat O Unsat O sat O Unsat.
connection bolts accordance with Attachment 3 CIean, no cracks or damage, boot O sat O Unsat O sat O Unsat l
4.12.11 Insulating boots i st Ductor phase A
[ [
g f
/
4.12.17.1.
Ductor phase B 0 to 5 R g
Ductor phase C f
a Step 4.12.20 Tools and equpiment removed from bus compartments and cubicles (Electrician Initial /Date)
/
(Independent Verifier Initial /Date)
/
Comments
+
FLS Date l
Maint. Form 772.6-2 Rev. 1 Page 4 of 4
Procedure or Form Cancellation Request (Sheet 1 of1)
S % $ k $ % 51}Eil h $15 h k h N $ $ 7 N @ h $ d b h d i! { h h @ g h Document No.:Maint. Form 772.6-3 Revision No.':
0 7jtje.
Metal Clad Switchgear Type M - 26 Data Sheet C j
Initiated By: Tim McNernev
. Date:
1/6 /m I
l-Reason for Cancellation:
1 L
This information is now incorporated into Maint. Forms 7'72.6-1 Rev. 2 and 772.6-2, Rev.1.
1 l
One procedure or form cancellation per Attachment 7.
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