ML20127N908
| ML20127N908 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/27/1983 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20127N901 | List: |
| References | |
| PT21429, TAC-53133, NUDOCS 8507020240 | |
| Download: ML20127N908 (11) | |
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form Approved 4ffation Supe /Intendent Effective Date STATION PROCEDURE COVER SHEET A.
IDENTIFICATION Number PT 21429 Rev.
2 Title Reactor Trin Switchaear Shunt Trio a Undervoltage Device Test Prepared By Production Test B.
REVIEW I have reviewed the above procedure and have found it to be satisfactory.
TITLE SIGNATURE DATE
/d 27 f
DEPARTMENT HEAD rffr J~upin<. w re> rt
$l l1. 7 6 3 l
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C.
UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRED:
(Significant change in procedure method or scope as described in FSAR)
YES [ ]
NO [x]
(If yes, document in PORC/SORC meeting minutes)
ENVIRONMENTAL IMPACT l
(Adverse environmen'tal impact)
YES [ ]
NO [x]
i (If yes, document in PORC/SORC meeting minutes) l D.
PROCEDURE REQUIRES PORC/SORC REVIEW YES [x3 NO [ ]
E.
PORC/SORC APPROVAL PORC/50RC Meeting Number 7-83-?Al F.
APPROVAL AND IMPLEMENTATION The attached procedure is hereby approved, and effective on the date below:
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On 9fLcALLv1Y a.h,Ir, Sta[t' ion / Service / Unit Superint'endent Effective Date SF-301 I"
Rev. 6 hhk70ggy $$8
$ 6 P
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Proc. PT21429
( )
P fsicn: 2 ~ Dat2: 12-27-83' F.,e 1 g
w REACTOR TRIP SWITCHGEAR SHUNT TRIP AND UNDERVOLTAGE DEVICE TEST Page No.
Effective Revision Date 1
2 12-27-83 2
2 12-27-83 3
2 12-27-83 4
2 12-27-83 5
2 12-27-83 6
2 12-27-83 7
2 12-27-83 8
2 12-27-83 9
2 12-27-83
Proc. PT21429 R""ision: 2 Date: 12-27-83 d.-
F _,k 2 1.
OBJECTIVE 1.1 The purpose of this procedure is to establish a uniform method of inspection and test of the General Electric Undervoltage Trip Device
- 269C282.5 used in the Reactor Trip Switchgear, and detennine the response time of the breaker to a loss of control power.
1.2 The procedure will also be used to verify that the shunt trip device will independently trip the Reactor Trip Switchgear breakers.
1.3 The scope of this test will be Ifmited to verifying that the under-voltage trip device and shunt trip device will onerate within the limits of the Acceptance Criteria when a simulated input is applied.
These instructions do not purport to cover all details or variations in equipment nor to provide fcr every possible contingency to be met in connection with installation, operation, or maintenance. Should further infonnation be desired or should particular problems arise, the matter should be referred to the appropriate instruction book or to the General Electric Company.
2.
ACCEPTANCE CRITERIA 2.1 When energized at 125VDC, the shunt trip device should cause the breaker to open.
2.2 The pickup of the undervoltage device should be 106VDC (-2, +4 v'olts) when the device is at room temperature.
2.3 The dropout of the undervoltage device should be 60% or less of the nominal voltage rating (125 volts).
2.4 The breaker will trip in 50 milliseconds or less when the control power is removed.
Proc. PT21429 t 1 i ;ision: 2 Date: 12-27-83 P:ge 3 3.
REFERENCES 3.1 GEH-2021A 3.2 GEI-50299A 3.3 GE Service Advice 175-9.3 and 175-9.3S 3.4 Control Schematic for RTS breakers 25203-32045, Sheets 1-9.
4.
PREREQUISITES 4.1 Test Equipment Digital voltmeter Variable source of D.C. voltage Doble timer 4.2 Reactor is shutdown.
4.3 Maintenance Department has completed lubrication and PM's on breaker (Maintenance Form: 2701J-1).
i 4.4 Shift Supervisor has been notified of work to be done.
5.
INITIAL CONDITIONS 5.1' Reactor trip switchgear breakers are racked out.
6.
PRECAUTIONS 6.1 All undervoltage trip devices are to be verified while mountad on a breaker and in a level upright position.
7.
PROCEDURE 7.1 Clean the undervoltage device of dirt, dust or any foreign particles.
7.2 Check for proper clearances and air gaps on the undervoltage device.
NOTE: This step need only be done if an undervoltage device has been replaced or if the results of Step 7.3 are unacceptable.
Pr c. PT21429 I lisicn:
2 Date: 12-27-83 Pagn 4 7.2.1 Insert a feeler gauge through the side of the frame to measure the clearance between the armature and rivet, refer to Figure 9.1.
Optimum operating conditions exist when the clearance between rivet (13) and armature (3) is between 0.001 and 0.010 inches. Measurements should be taken at the outer edge of the j
armature where a constant radius is in close proximity to the 4
rivet.
J 7.2.2 If adjustment is required, it can be accomplished by loosening l
screws (11) and moving the magnet (10) up or down as necessary I
to obtain the proper clearance. Retighten screws (11) and l
check that clearance is still acceptable.
7.2.3 Set the open air gap between the armature and magnet at k inch with the undervoltage device de-energized. This is accomplished l
by setting the gap at point 1 in Figure 9.2 at 0.201 inches (use a drill bit) and adjusting the screw in the front upper left portion of the undervoltage device.
7.2.4 Set the closed air gap between the armature and magnet at 1/32 inch with the undervoltage coil in the picked up position.
This is accomplished by use of feeler gauges and adjustment of the screw (6) in Figure 9.'1.
7.2.5 Upon completion of,all adjustments, the undervoltage device should be reinstalled on the circuit breaker.
7.3 Check and/or adjustment of the undervoltage device pickup.
7.3.1 Apply a variable DC voltage source to fingers 6 and 7 of auxiliary block B (Figure 9.3).
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Proc. PT21429 r Jsion: 2 Data: 12-27-83 i
Pcg2 5 7.3.2 Increase voltage until the undervoltage device picks up, record pickup voltage "as found" on data sheet fonn PT21429-1. Repeat two more times. Acceptable pickup voltage is 106VDC -2, +4 volts.
CAUTION: CARE SHOULD BE TAKEN NOT TO ENERGIZE THE UNDERVOLTAGE COIL FOR A LONG PERIOD BECAUSE THE COIL RESISTANCE INCREASES AS THE COIL HEATS AND THE PICKUP VOLTAGE WILL INCREA'SE WITH COIL TEMPERATURE.
7.3.3 With the undervoltage device energized and picked up, decrease the applied voltage until the device drops out. Record drop out voltage "as found" on data sheet form PT21429-1. Repeat two more times. Acceptable drop out voltages are 75 volts or less.
7.3.4 If the pickup of the undervoltage device is not acceptable, adjustment can be made by removing the locking wire and turning the adjusting screw (14) in Figure 9.1.
Turning in a clock-wise direction will increase pickup voltage.
7.3.5 After calibration and reinstallation of the locking wire, the undervoltage device should be allowed to cool for one hour to attain room ambient temperature and then the pickup voltage should be rechecked with three quick measurements.
If pickup voltage is not acceptable, then repeat Step 7.3.4.
If pickup voltage is acceptable, then record the "as left" voltage values on data sheet form PT21429-1 and repeat Step 7.3.3 to obtain "as left" values of drop out voltage, record on data sheet.
7.4 Check and/or adjustment of the undervoltage device overtravel (posi-tive trip).
NOTE: This step is necessary only if the undervoltage device was removed from the breaker in order to make adjustments.
Proc. PT21429
- 1 F ision: 2 Data:
12-27-83 Paga 6 1
7.4.1 The undervoltage device armature should have enough overtravel in its motion to ensure the trip paddle moves more than the amount necessary to trip the breaker. This overtravel should be 1/32 inch plus 1/64 inch minus 0 inch. Place a 1/32 inch diameter wire between the open air gap stop and the armature extension. The contacts should just start to close when the mechanism is operated to the closed position.
7.4.2 Adjustment can be accomplished by turning screw (20)-in f
Figure 9.1.
7.4.3 With the 1/32 inch wire removed, the breaker should be trip free with no contact movement or resistance when the mechanism 1
is operated.
i 7.5 Shunt trip device trip test.
1 7.5.1 Independently test the shunt trip device to verify that it will trip the breaker open when the shunt trip is energized.
7.5.2 Place the breaker in the test position, verify the under-voltage device is picked up, locally close the breaker using the test pushbuttons located inside the door on the lower right portion of the breaker frame.
7.5.3 Use the local test " trip" pushbutton to trip the breaker while visually verifying that the undervoltage device does not drop I
e i
out.
7.5.4 Rack the breaker out and leave in the disconnect position.
7.6 Breaker response time to undervoltage condition.
7.6.1 Rack out the breaker and connect the 3 line stabs together and connect the 3 load stabs together.
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Proc. PT21429
- .I F #sicn: 2 Date: 12-27-83 Pcge 7 7.6.2 Place the breaker in the test position.
CAUTION: ENSURE THE CONNECTORS USED TO JUMPER THE STABS TOGETHER DO NOT TOUCH THE BUS BARS IN THE BACK OF THE CUBICLE.
7.6.3 Connect the timing device stop circuit to two leads brought out from the jumpered stabs.
- 7. (,. 4 Connect the timing device start circuit to the control power fuses so that the timer will start when the fuse is pulled.
7.6.5 Close the breaker using the test pushbutton located inside the door on the lower right portion of the breaker frame.
7.6.6 Pull one of the control power fuses.
7.6.6.1 The breaker should trip.
7.6.6.2 The timer should operate and indicate a time <50 m sec.
7.6.6.3 Record response time on data sheet.
7.6.7 Repeat Steps 7.6.5 and 7.6.6 two more times.
7.6.8 Rack out breaker and remove test leads.
t 8.
RESTORATION 8.1 Remove any test equipment connected to breaker.
8.2 Replace any covers removed for access.
9.
fir;URES l
9.1 Undervoltage Device 9.2 Air Gap Setting 9.3 Auxiliary Block B Layout l
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Proc. PT21429
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Fevision: 2 Date: 12-27-P3
' 'Page 8 i
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!s 1.
Mounting Screw 2.
Frame 1
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Armature 4.
Spring f., '%Is 5.
Shading Plug r.y.
6.
Adjusting Screw
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7.
Locking Nut (N
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Bushing 9.
Clamp E[
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- 10. Magnet
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- 11. Screws d
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- 14. Adjusting Screw l
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- 15. Locking Wire
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- 16. Mounting Nut 5
- 17. Mechanism Frame
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- 18. Trip Paddle Clamps o
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- 19. Trip Paddle i w
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- 20. Adjustirvj Screw 2
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FIGURE 9.1 l
Proc. PT21429
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l levision:
2 Date: 12-27-83
-Page 9 i
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FIGURE 9.3
l PORC Mtg. No.1-85-14l Date: INMl6 honn pproval V
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UNDERVOLTAGE TRIP DEVICE DATA SHEET U. V. Device Model Circuit Breaker I
Control Schematic Test Data i
Pickup Dropout As Found As Left As Found As Left l
Breaker Response Time to U.V. Condition 1.
2.
3.
Test Equipment Used QA No.
Due For Calibration Comnents:
N Test Technicians m
Date of Test Fonn PT 21429-1 Revision: 1 Date: i?.-T7-63 i
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