ML20212P021
| ML20212P021 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/18/1986 |
| From: | Murgatroyd R FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20212N983 | List:
|
| References | |
| PM-101, NUDOCS 8703130249 | |
| Download: ML20212P021 (29) | |
Text
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Rev. 12 04/14/86 HKC 04/30/86 t' q T a % - % _.g # " tr:sa l* . 't un y ' '. a y .s a i i o n o u t yy pl ,
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PREVENTATIVE %% MAINTENANCE
_._ _ . PRocwunt j' PM-101 FLORIDA POWER CORPORATION -
CRYSTAL RIVER UNIT 3 4.16 kV and 6.9 kV SWITCHGEAR l12 THIS PROCEDURE ADDRESSES SAFETY RELATED COMPONENTS l
THIS PROCEDURE ADDRESSES ENVIRONMENTALLY QUALIFIED (EQ) EQUIPMENT l
APPROVED BY: Responsible Section Su erintendent/ Supervisor Date 4#-/8-bb INTERPRETATION CONTACT: Nuclear Maintenance Supt.
8703130249 PDR 870305 P
ADOCK 05000302 PDR
HKC 04/30/86 1.0 PtmDOSE 1.1 To Provide instructions for checking, cleaning, and testing 4.16 kV and 6.9 kV switchgear.
Procedure Section Dissassembly of 4.16 kV and 6.9 kV Switchgear 7.1 Check of 4.16 kV and 6.9 kV Switchgear 7.2 Cleaning and Lubrication of 4.16 kV and 6.9 kV Switchgear 7.3 Testing and Reassembly of 4.16 kV and 6.9 kV Switchgear 7.4 Circuit Breaker Installation 7.5 2.0 nmnrwr n 2.1 IMPLEMENTING REFERENCES 2.1.1 CP-115, In-Plant Equipment Clearance and Switching Orders 2.1.2 CP-113, Handling and Controlling Work Requests and Work Packages 2.2 DEVELOPMENTAL REFERENCES 2.2.1 Nuclear Plant Instruction Manual 856, Indoor Metal-Clad Switchgear, Could-Brown Boveri (ITE) 2.2.2 Nuclear Plant Instruction Manual #650, Visicorder Instruction Book PM-101 Rev. 1g Page 1
3.0 ENCLOSURM Enclosure 1 View Showing Arc Chute and Contact Structure Enclosure 2 Front View of Control Panel Enclosure 3 Method of Racking Out Circuit Breaker Enclosure 4 Contact Pressure and Bridge Pivot Pressure Enclosure 5 Latch check Switch Adjustment Enclosure 6 Racking Mechanisa Enclosure 7 Hipot or Megger Connection Diagram Enclosurc 8 Breaker Contact Connection Diagram 4.0 LIMITS AND PRECAUTIONS 4.1 Do not attempt breaker removal if mechanical flag indicates that breaker is closed.
4.2 When work is performed on energized equipment, such as terminals, cables, busses, or cubicles, or when work is performed on or around batteries, all tools, tool boxes, and other equipment used must be insulated.
4.3 when closing spring operation is desired while breaker is removed, be sure to stay clear of moving parts.
4.4 For CR-3 equipment designated as "QQ' on the safety Listing that requires replacement parts, work shall be handled through CP-113, Handling and Controlling Work Requests and Work Packages.
PM-101 Rev. 1 2 Page 2
5.0 EQUIPMENT AND PERSONNEL REQUIRDENTS 5.1 Personnel assigned shall be knowledgeable, experienced, and qualified to perform the specified tasks as determined by the appropriate supervisor.
5.2 Hipot Set.
5.3 Microhmaeter.
5.4 Vacuum Cleaner and Small Brush.
5.5 Flashlight and Assorted Hand Tools.
5.6 Oscillograph.
5.7 3/16, 7/64, 5/32, 9/64, 1/8, and 1/32-in. Rods or Drills.
5.8 Manual Charge Handle.
5.9 Spring Retainer Bracket.
5.10 D.V.M. Fluke (or equivalent).
5.11 1/2-in. Combination Wrench, 3 '8 in. Wrench, 9/16-in.
Combination Wrench, and 1/2-in. Socket.
6.0 REOUIRED INITTAI. CONDITIONS AND PLANT STAIQS 6.1 The equipment to be worked on is to Se isolated and removed from service using an approved Operating procedure and an Equipment Clearance Order per CP-115, In-plant Equipment Clearance and Switching Orders.
PM-101 Rev. 12 page 3
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HKC 04/30/86 NOTE: Ensure control power is removed from the breaker by removal of control power fuses.
6.2 Obtain a Radiation Work Permit (RWP), if required.
6.3 Notify the Nuclear Shift Supervisor of breakers to be removed.
7.O Prot *FnURE
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7.0.1 Ensure o Limits and Precautions of Section 4.0 have been reviewed, o Equipment and Personnel are available per Section 5.0. '
o Initial Conditions of Section 6.0 have been me..
. Completed By Date _
7.1 DICACSEMBLY OF 4.16 kV AND 6.9 kV SWITCHGEAR NOTE: This procedure is designed to be used with (ne 4.16 kV or 6.9 kV Switchgear.
Tag No. Serial No.
PM-101 Rev. 12 Page 4
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- 7.1.1 circuit nr..her n==aval (Enclosure 3) 7.1.1.1 Open sliding door in front compartment door.
7.1.1.2 Engage racking crank and push racking unlocking lever to left.
7.1.1.3 Rotate racking crank counterclockwise approximately \ turn, then release unlocking lever. Continue cranking counterclock-wise until rack mechanism automatically stops at " Test" i
position.
7.1.1.4 Again push the racking unlocking lever to the lef t and turn the racking crank counterclockwise only until resistance to motion is felt, (approximately 2-3 turns - DO NOT FORCE).
7.1.1.5 Remove the circuit breaker from the compartment by pulling on the handle or by pulling at lower edge of front barrier sheet using breaker removal tool (fifth wheel). -
NOTE: The closing springs, if charged, will automatically discharge when the circuit breaker is withdrawn from the switchboard.
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7.1.1.6 Verify charging springs are discharged.
Completed By Date i
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l PM-101 Rev'. 12 Page 5 t
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7.1.1.7 Record the number of operations prior to maintenance.
No. Operations Completed By Date 7.1.2 Agnev11 of Inte-chase narrier 7.1.2.1 Remove two lower front sheet screws and lift front sheet up and away from the breaker.
7.1.2.2 Remove arc chute tie bar at upper front of are chutes.
7.1.2.3 Pivot rear brace at rear of each barrier upward and slide the separate barriers forward and away from the circuit breaker.
NOTE: The barriers will not stand unsupported and. must be braced.
Completed By Date 7.1.3 menoval of Arc chutes (Enclosure 1) 7.1.3.1 Remove nut and gently disconnect return cornection.
7.1.3.2 Remove bolt connecting the front leg of the are chute to the block on the base sheet of the circuit breaker.
PM-101 Re( 1 2 Page 6 I
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HRC 04/30/86 7.1.3.3 Slowly raise the arc chute by hand with two people. It will pivot at its terminal connection.
CAUTION: When performing Step 7.1.3.4 be sure return connection is clear and does not catch on the are chute. Block wheels on 6.9 kV breaker to prevent rolling.
7.1.3.4 Guide the are chute straight out of the pivot guide slot and fingers and remove away from circuit breaker.
NOTE: If only a visual check is to be saIe, each are chute may be tilted back gently, hand held and are chute tilt support bolted into place between are chute leg and block.
Completed By nate PM-101 Rev. 12 Page 7
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HKC 04/30/86 7.2 CEECI 0F 4.16 kV and 6.9 kV SWITCHCEAR (Enclosure 6) 7.2.1 Check of Rackine Mechanism 7.2.1.1 Remove lower front mechanism coverplate.
7.2.1.2 Close circuit breaker.
7.2.1.3 Check adjustment at 'A' between trip link and biccking lever as follows:
6.9 kV Breaker = 5/32 1 1/32 4.16 kV Breaker = 9/64 - 0 + 1/32 7.2.1.4 If not adjusted properly make adjustment by regulating length of connecting rod.
7.2.1.5 open circuit breaker.
Completed By Date 7.2.2 Visually check wiring, contacts, and terminal boards for evidence of deterioration, arcing, or grounding.
Sat. Unsat.
Completed By Date PM-101 Rev. 12 Page 8
7.2.3 Check cubicle space heaters for proper operation.
Sat. Unsat.
Completed By Date 7.2.4 It may be necessary to adjust space heater thermostat located in upper cubicle to activate space heater. Return thermostat to original setting.
7.2.5 Check Breaker contacts 7.2.5.1 Check breaker contacts for excessive pitting.
7.2.5.2 If pitting is excessive dress the contact as follows:
7.2.5.2.1 Cover the puffer nozzle with a cloth.
7 1.0.2.2 Follow the contour of the contacts with a fine file.
NOTE: Do not attempt to eliminate pitting entirely.
7.2.5.2.3 Remove cloth from puffer nozzle.
7.2.5.2 4 Replace contacts if contact material thickness is reduced to 50% of original.
Completed By Date pH-101 Rev', 12 ,
Page 9
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l HKC 04/30/86 7.2.5.2.5 If contacts are replaced or dressed perform contact pressure check and millivolt drop check.
A 7.2.6 Check Arc Churga 7.2.6.1 Check are chutes internally. for breakage to liner plates rnd arc plates.
7.2.6.2 Check liner plates for crust buildup. If found remove by ,
scraping of storing. '
7.2.6.3 Blow out arc chutes with air. '
7.2.6.4 Replace are chute if entire leading edge and porticos of the .'
flat are plate are noted to be heavily encrusted with gi ss beads. -
J Completed By Date 7.2.7 check of Puf QII (Enclosure 1) 7.2.7.1 Close breaker.
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CAUTION: Keep clear cf moving parts.
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PM-101 Rev. 12 page 10
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f 5 HKC 04/30/86 7.2.7.2 Place a piece of cloth over puffer jets.
~ 7.2.7.3 Open breaker and verify a moderate blast of air at the breaker s
contacts.
4 IIOTE: All three poles must have puffing action.
Completed By Date 7.2.8 Measure resistance of blowout coils with D.V.M. Fluke or equivalent.
s Resistance Reading A0 B0 CO Test Set ID Cal Due Date
! Completed By Date _._
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7.2.9 check of contact Pressure (Enclosure 2 and Enclosure 1) 7.2.9.1 Turn racking screw clockwise two to three turns until racking -
unlocking lever snaps into first position. (nisconnect position).
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. 7.2.9.2 Manually slow-close the circuit breaker and check adjustments as follows:
7.2.9.2.1 Engage manual charge handle with charging lever.
7.2.9.2.2 Pump charging lever until breaker closing springs snap into charge position. Remove handle.
I PM-101 Revt 12 Page 11
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1.2.9.2.3 Insert both tangs of spring retainer bracket into holes of closing spring guides.
7.2.9.2.4 Pull manual close lever to discharge closing springs onto tangs of spring retainer bracket.
NOTE: At this time the contacts will partially close.
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7.2.3.2.5 Re-engage manual charge handle with charging lever.
7.2.9.2.6 slowly pump to slow close breaker contacts. Close only to point where the first are contact just touches.
7.2.9.2.7 Check that the other are contacts touch within 1/32".
7.2.9.2.2 Continue slow-close operation to fully close breaker.
7.2.9.2.9 Check contact compression at 'A' (Enclosure 4), between edge of metal stop plate and 'sain contact stop to be 5/32 2 1/32.
7.2.9.2.10' if readings are out of spec. , adjust contacts with adjusting s r.ed .
Completed By Date l
l 7.2.9.3 With breaker in charged position remove spring retainer bracket.
7.2.9.4 Discharge closing springs by pulling manual close lever and pushing manual trip button at same time to effect a trip free l
operation.
l Completed By Date l
l PM-101 Rev. 12 page 12
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7.3 N ING m I.UBRTEATION OF 4.16 kV and 6.9 kV SWITCHGEAR 7.3.1 Vacuum the cubicle and check condition of breaker frame sliding ground connection at the breaker and the cubicle.
7.3.2 Clean breaker using a vacuum cleaner and small brush.
7.3.3 Perform any required lubrication on racking mechanism with NO-0X-ID, Grade "A" lubricant.
NOTE: Do not use NO-0X-ID grease on any main and arcing contact surfaces.
Completed By Date 7.4 ' TESTING AND RFARSEMBLT OF 4.16 kV and 6.9 kV SWITCHGEAR 7.4.1 Millivolt Droo Test 7.4.1.1 Measure contact resistance of each phase.
Phase 1 alcro-ohms Pha: e 2 micro-ohms Phase 3 micro-ohms Test Instrument ID Cal Due Date Completed By Date PM-101 Rev. 12 Page 13
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. 7.4.1.2 Verify resistance is as follows:
6.9 kV Breaker 1 45 micro-ohns 4.16 kV Breaker 1 38 micro-ohms 7.4.1.2.1 If resistance value exceeds specified values above, dress contacts with a fine file, clean and adjust for proper contact pressure and re-perform resistance measurements.
7.4.1.2.2 If resistance value still exceeds specified values, readjust the bridge pivot pressure (Enclosure 4).
Completed By Date 7.4.2 install-Arc Chutes (Enclosure 1) 1 1
7.4.2.1 Position arc chute in tilted position, squarely down into its rear pivot quir e slots and fingers, then lower slowly into position.
NOTE: Be sure return connection is clear and does not catch on the are chute.
7.4.2.2 Securely faster return connection by its nut.
l 7.4.2.3 Rebolt the front are chute support leg to its hold down block.
Completed By Date l
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PM-101 Rev. 12 Page 14
HKC 04/30/86 7.4.3 Install Internhase Barrier 7.4.3.1 Slide the interphase barriers in place between the lead support soldings and inside of clips on outside molding.
7.4.3.2 Pivot the rear brace downward behind the are chutes.
7.4.3.3 Install arc chute tie bar at upper front on are chute.
7.4.3.4 Lift front sheet in place so it hooks over are chute tie bar.
7.4.3.5 Secure barrier front sheet in place with front sheet screws.
t Completed By Date 7.4.4 Yn= tall covers 7.4.4.1 Install backside access panels.
7.4.4.2 Install front cover.
7.4.4.3 Install lower front mechanism cover.
NOTE: Ensure all locking devices are installed during assembly.
Completed By Date 1
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I PM-101 Rev. 12 Page 15
9 7.4.5 areaker Insulation Test (Enclosure 7) 7.4.5.1 Perform breaker insulation test using the following HIPOT information:
6.9 kV Breaker - 30 kVDC 4.16 kV Breaker - 16 kvDC Test time - 1 minute 7.4.5.2 Take five (5) readings as shown on Enclosure 7.
Test 1 DC Volts Micro Amps .
Test 2 DC Volts Micro Amps Test 3 DC Volts Micro Amps Test 4 DC Volts Micro Amps Test.5 DC Volts Micro Amps HIPOT Test Inst. No. -
Cal Due Date Completed By Date 7.4.6 Breaker Timina Test NOTE: Attach visicorder traces to this procedure.
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CAUTION: Not acceptable unless AC reference signal is present.
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PM-101 Rev. 12 Page 16
7.4.6.1 Use 125 VDC traces to monitor the following:
- a. Phase 'A' Main Contact
- b. Phase "B" Main Contact
- c. Phase 'C' Main Contact
- d. "A" Contact
- e. *B' Contact
- f. Trip Signal
- g. Close Signal 7.4.6.2 Measure the following and record.
- a. Trip Time (1.38 - 1.8 Hz) Hz
- b. Close Time (6.9 kV Breaker 6.0 - 8.7 Hz) Hz (4.16 kv Breaker 3.0 - 5.4 Hz) Hz
- c. Trip Free Time (< 1.8 Hz) Hz AC'Peterence Signal, 120V, 60 Hz d.
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Completed By Date NOTE: Adjustments to correct speeds, if found to be outside above limits, are critical and Gould-Brown Boveri should be contacted for recommendations.
7.5 CIRCUIT BREAKER INSTALLATION (Enclosure 3) 7.5.1 Check metal bump on bottom of cubicle which automatically discharges springs.
PM-101 Rev. 12 Page 17
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7.5.1.1 Engage racking crank and push racking unlocking lever to lett, then rotate racking crank counterclockwise only until resistance to action if felt (DO NOT FORCE).
7.5.1.2 Engage fif th wheel with hole; guide and push circuit breaker into compartment until it stops.
IIOTE: If closing springs were left in charged condition, they will automatically discharge.
7.5.1.3 Rotate racking crank clockwise until racking mechanism automatically stops at ' DISCONNECT" position.
NOTE: Do not rack in breaker if it is tagged.
7.5.~1.4 Push unlocking levt.r to left and' turn racking crank approximately 13 turn clockwise, then release unlocking lever.
7.5.1.5 Continue cranking until. racking mechanism automatically stops at " Test' position.
7.5.1.6 Repeat Steps 7.5.1.4 and 7.5.1.5 until stops at " Connected" l
( position.
l CAUTION: Do not attempt to rack any further.
l l ...............................................................
PM-101 Rev. 12 Page 18
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7.5.1.7 Check cubicle door for operability of the door holddown bolts.
7.5.1.8 Check cranking door for operability.
7.5.1.9 Record the operation counter.
Counts Completed By Date 8.0 POST-MAINTENANCE TESTING AND SYSTDI REETORATIQ]!
8.1 Release Clearance per requirements of CP-115, In-Plant Equipment Clearance and Switching Orders.
t PM-101 Rev. 1 g Page 19
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i ENCLOSURE 1
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View Showing Arc Chute and Contact 5fructure View Showing Arc Chute and Contact Structure 6.9 kV 4.16 kV PARTS ID FOR 6.9 kV PARTS ID FOR 4.16 kV 1 - Tie Bar Bushing 1 - Arc Chute 2 - Arc Chute 2 - Lead Support Molding 3 - Lead Support Molding 3 - Puffer Nozzle 4 - Contacts 4 - Attachment Points for Lifing Yoke 5 - Puffer Nozzle 5 - Return Connection 6 - Base Plate 6 - Nut 7 - Attachment Points for Lifting Yoke 8 - Bolt 9 - Block 10 - Front Leg (Arc Chute Leg) 11 - Connection (Return) 12 - Nut 13 - Arc Chute Tilt Support i
PM-101 Rev. 12 Page 20 1
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ENCLOSURE 2
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,e Parts ID for 6.9 kV and 4.16 kV pene%ew of Control Panel 1 - Motor Disconnect Switch 6.9 kV 2 - Closing Spring Guides
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3 - Charging Lever
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ENCLOSURE 3 f ,
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.i ie $ 4 Parts ID for 6.9 kV and 4.16 kV Method of Rocking Crcuit Breaker 1 - Front Compartment Door 6.9kV 2 - Sliding Door 3 - Racking Unlocking Lever 7 4 - Racking Crank i
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Method of Rocking Crcuit Breaker 4.16 kV PM-101 Rev. , 12 Page 22
ENCLOSURE 4 Parts ID for 6.9 kV m
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3 - Acusting Stud
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l Contact Pressure end Bridge Pivot Pressure l
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PM-101 . Ret.12 Page 23
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- ENCLOSURE 5 0
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Parts ID for 6.9 kV and i.16 kV 1 - Adjusting Screw Letch God Switch Adiostment 6.9kV 2 - Switch 3 - Reset Stop Pin 4 - Trip Latch G
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l PM-101 Rev. 12 Page 24
ENCLOSURE 6
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1 A Recidag Mechanism Parts ID for 6 9 kV and 4.16 kV 1 - Connectiny Rod 2 - Blocking Lever 3 - Trip Link PM-101 Rev. 1 2 Page 25
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ENCLOSURE 7 HIPOT OR MEGGER CONNECTION DIAGRAM .
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Page 26 PM-101 Rev.12
4 ENCLOSURE 8 i
BREAKER CONTACT CONNECTION DIAGRAM RT-3-100 OIGITAL MICR0HMMETER OR EQUIVALENT
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PM-101 Rev,. 1 2 Page 27 (LAST PAGE)
4 ITEM 2 i
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