ML20236N779

Rev 2 to Procedure 3.M.1-1.2, Electrical

ML20236N779
Person / Time
Site:	Pilgrim
Issue date:	09/05/1978
From:	BOSTON EDISON CO.
To:
Shared Package
ML20236N770	List: ML20236N767 ML20236N775 ML20236N779 ML20236N781 ML20236N784 ML20236N787 ML20236N791 ML20236N817 ML20236N847
References
FOIA-87-644 3.M.1-1.2, NUDOCS 8711170006
Download: ML20236N779 (6)

Text

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. NUCLEAR OPERATIONS DEP/aTMENT PILGRIM NUCLEAR POWER STATION PROCEDURE NO. 3.M.1-1.2 .

ELECTRICAL ,

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O List of Effective Pages 3.M.1-1.2-1 Rev. 2 3.M.1-1.2-2 Rev. 2 ,

3.M.1-1.2-3 Rev. 2 '

3.M.1-1.2-4 Rev. 2 3.M.1-1.2-5 Rev. 2 3.M.1-1.2-6 Rev. 2

.y Attachments None li t

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Approved v 7/r . up Pil,g'rir Station Manage:

th 9s XV Date i

8711170006 871112 3.M.1-1.2-1 Rev. 2 ,

PDR FOIA PDfk SORGIO7-644 - - _ - Y)f-

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' t I .~ . PURPOSE t() ii A. To establish - the guidelines of preventativecmaintenance to be. performed on electrical equipment at Pilgrim Station.

B. To provide assistance in the' scheduling of electrical maintenance.

C. To provide insight to Pilgrim Station Electric Preventative Maintenance Program, s o II. DISCUSSION This procedure lists Pilgrim' Station's major' electrical components and the appropriate ' - e tests to provide operating reliability.-

Plant conditions will dictate the maintenance schedule to be performed with most ,/

of the work to be scheduled during' Refueling Outages. '

)

Many of the tests can be performed.other than during Refueling Outages and an attempt will be made to schedule them during Refuel Outages.

, i III. REFERENCE MATERIAL , ,

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A. Maintenance and Calibration Procedure f

B. Surveillance Procedure >

C. Vendor Manual Calibration and Testing Procedures

( )-

D. ,

r ,o IV. PREREQUISITES / ,

Proper Maintenance Requests and Radiation Work Permits l l

V. APPARATUS ' ,

A. The appropriate test equipment +

'B . Test equipment when being used on safety-related. cquipment must have certification , i

)

date verified.

VI. PRECAUTIONS

' The Maintenance Request procedure must be strictly adhered to, j 3 VII. TROCEDURE /

The procedures'and work instructions to be used will be delineated by the, Electrical ,

Engineer on individual Maintenance Requests. The following is a compon'ent list '

'> 't-with their appropriate tests:

a O -

.,3 . M .,1-1. 2- 2 Rev. 2 .

'O' 4

, a ,

s A. MAIN CENERATOR AND EXCITER

() 1. General Electric Co. Tests and Reports Boston Edison Visual Inspections and Reports

2. i

3. Main Generator Stator and Field D.C. Hi-Pot >

4. Main Generdtor,Sgater Insulation and Resistance

5. Main Generator Field Insulation and Resistance i V

6. Main Generator Stator Power Factor , e

7. Exciter Stator Insulation and Resistance

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8. Exciter Field Insulation and Resistance

9. Main Generator Rtd. and Thermal Couples ,

10. Relays Calibrated and Tested

11. Brushes - visual inspection and replacement  ;

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12. Field Breaker Overhauled )

13. Bearings (Meggar). )

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() 14 Special Tests and Reports t

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B. MAIN TRANSFORMER

1. Power Factor (Transformer) and Lightning Arrestors ,

2. Oil Samples - Dieletric, Acidity and Combustionable Gas ,

3. Alarms Calibrated and Tested ' i

4. Deluge System Tested i v l

l 5. Relays Calibrated and Tested i l

l >

6. Screen Test and Dissolved Gas ,

< r C. UNIT AUXILIARY TRANSFORMER l

1. Oil Stuples - Dieletric, Acidity and Combustionable Gas

'2. Deluge System Tested s i f' ,

3. Relays Calibrated and Tested *

4. Alarms Calibrated and Tested bO D. START-UP TRANSFORMER '

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1. Power Factor Transformer a.,d Lightning Arrestors 3.M.1-1.2-3 Rev. 2 t

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2. Oil Samples - Dieletric, Acidity and Combustionable Gas t'm L) 3. Alarms Calibrated and Tested

! 4 Relays Calibrated and Tested I,

3. Deluge System Tested I

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6. Insulation Test on 4.16Kv Feeder Cables E. SHUTDOWN TRANSFORMER

1. Oil Samples - Dieletric, Acidity and Combustionable Gas 4

2. Alarms Calib' rated and Tested l

3. Relays Calibrated and Tes'ted

-4. Deluge System Tested

5. Insulation Test and 4.16Kv Feeder Cables

6. Load Test F. 345Kv SYSTEM

1. Relays Calibrated and Tested 1

r-(x,) 2. Wave Traps Calibrated and Tested 1

3. Breakers

a. Power-factored

b. Timed

c. Overhauled

d. Contact Resistance ,

4. Disconnect Switches Overhauled G. DIESEL GENERATORS

1. Power Factor

2. Stator and Fld Insulation

3. Stator and Fld. Resistance i 4. Insulation Test on Feeder Cables i

.5. Relays Calibrated and Tested

6. Alarms Calibrated and Tested s

,, ~s 7. Brushes Checked t i , , i

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8. Sequential Load Test i H. 4.16 Kv BUS Al THROUGH A6 i

1. Breakers Overhauled i 3.M.1-1.2-4 Rev.' 2

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,f 9 i-Relays Calibrated and Tested b

2.

Motors with, Feeder Cables Insulation Teste

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3.

4. A5 and A6 Busses Insulation Test .

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5.- A5 and A6 Transformers Feeder Cables Insulation Test 480V LOAD' CENTERS B1 THROUGH BS I. ' *

1. Breakers Overhauled  :> ,.

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'2. Relays Calibrated and Tested , i a3. B1 and'B2 Transformers Insulation Test-i

4. B1, B2 and,B6 Feeder Cables Insulation Idst:" '

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5. i B1, B2 and B6 Automatic Transfer ~ Scheme . Tested' a. ., p

6. ' B1,' B2 and B6 Motel Control Center Feeder CablesLInsulation, Test', . }

7. B1, B2, B3, B4, B'5, B7 and B8,Sapply Transformer Askeral Samples Tested ,

J. 480V MOTOR-CONTROL CENTERS

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1. Motor'and Feeder Cables Insulation Test

(), 2. Breakers Overhauled

3. ' Breaker Overcurrent Devices Calibrated f

"} '

4-K. RECIRCULATING MOTOR GENERATOR SETS A&B ' ,

1. Relays Calibrated and Tested c

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2. Alarms Calibrated and Tested  ;

3. Brushes - Checked >

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4. Generator Field Breaker Overhauled ,

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5. Calibrate Meters , ,

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6. Generator Field Insulation > ,

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7. Drive Motor Ins.ulation , ,

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, L. VITdL MOTOR GENERATOR SET.. .,<,. .i ;

1. . Relays Calibrated and Tested <

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, 2. Brushes . Checked , 5

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3. Test Transfer Sch'me e ,

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4. Generator and. Drive Motor Insulation Test ,,

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• M. REACTOR PROTECTION MOTOR GENERATOR SETS <A&B '

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• 1. Relays Calibrated and Tested. ,' ,,

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2. ' Generator and Drive Motor Insulation Tes't

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N. BATTERY: SYSTEMS ,

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1. Discharge Test , ,

2. Relays Calibrated and Tested a

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3. Alarms Caldbrated and Tested ,

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4. Meters Calibrated, l

5. Test Transfer Schemes , ,

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6. Clean Batteries , .

VIII. ACCEPTANCE CRITERIA ~ '

, .o j The appropriate procedure acceptance criteria will apply when' applicable. When.no -- ' " , j acceptance criteria is spelled out the Electrical Engineer will: verify.the results

i for acceptance. -

c a g IX. ATTACHMENTS A +

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• UNITED STATES.

NUCLEAR REGULATORY COMMISSION e 0FFICE OF INSPECTION AND ENFORCEMENT ' '

WASHINGTON, D.C. 20555.

~

{dh111 R TH E M f Eq7 Date: April 17, 1979

Page 1.of 3 5 t

! FAILURES OF GE TYPE AK-2 CIRCUIT' BREAKER IN SAFETY RELATED SYSTEMS

n. '

Description of Circumstances: ,

Twelve failures of General Electric (GE) type AK-2 (i.e., AK-2A-15, 25, b 50, 75, or 100) Circuit Breakers installed in safety-related systems-a, '

have been reported since 1975. The 4'ailures occurred at the following -

• facilities: .

a

Date Facility System Arkansas-1 Control Rod Drive System.

.1. 9/16/78 Control Rod Drive System

2. 9/25/78 Arkansasil '

Arkansas-1 Control Rod Drive System

, 3. 10/17/78 Control Rod Drive System

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4. 1/22/78 Crystal River-3 Control. Rod Drive System I 5. 8/7/75 Oco' nee Unit-3 Control Rod Drive system g

3

6. 1/18/79 Oconee Unit-3 f Oconee Unit-1 Control Rod Drive System-1 7. 1/22/79 ' Control Rod Drive System

8. 1/31/79 Oconee Unit-1 j

TMI/1 Control. Rod Drive System

, '. 4 9. 4/25/75 Containment Spray Pump

10. 11/26/78 Oyster Creek-l' ,

Oyster Creek-1 Service Water Pump No. 1

11. 11/30/78 Service Water Pump No. 2

12. 11/30/78 Oyster Creek-1 It is significant to note that during a Losp of-off-site power test on

, November 30,1978, at 0yster Creek, both service. water pump circuit lJ breakers failed to'. trip, as required. The undervol,tage relays which monitor voltage' level l on each emergency bus functioned properly but

.} could not actuate the trip mechanism via the undervoltaae trio dpy_i.ge within each circuit breaker. These failures, in' turn, created a poten-q

o tial overload condition'on each emergency diesel generator unit by allowing simultaneous starting of multiple high horse powerimotors

!., during the sequential loading phase of the test.

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• u The causes for failure were attributed to either bindina within the 3' li.nka_ge_me3ba'nism of the undervoltage (UV)Ttrip device and . trio shaft '

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.assemblv or out-of-adiustment conditions in the. same 1inkace mechanism. -

I Babcock.and Wilcox (B&W)'and GE determined that the bindina adjustment resulted from inadequate preventive maintenance programs"

~ and out-of- >

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IE. Bulletin No. 79-09

{ .-, Date: April 17,1979

- Page 2 of 3 ,

In each ca'se listed'above, cleanina  !

I at the affected operating facilities. )

and re' lubricating.th_e__ trip shaft mechanism within the circuit breaker  ;

' was required to correct the problem. )

The enclosed GE Service Advice Letter ~(SAL) 175(CPDD) 9.3 is being sent Y to all power reactor facilities notifying them.of the potentialeproblems.

for failu_rf_an_d_.provides_thelf raem-mded ,

f. , -

The SAL identifies the causes_Tification of the problem has been issued J- _corracHva AcHan. Similar no by B&W to all specific B&W designed facilities.

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a.+ . ,

Action to,.be Taken by Licensees  ;

I E For all power reactor facilities with,an operating license.or construc- ' ' ,

l

c tion permit

.

Determine whether or not GE type AK-2 breakers are used or planned -

(

p. for use in safety-related systems at your facility (ies). - , 4 If such circuit breakers are used .or planned foruse, identify the.

[' p. safety system involved and provide' in written fonn your plans for 1 n developing'a preventive maintenance program which will assure

,f/

design performance .with the GE type AK-2 circuit breaker. .

I. - 3. The program shall include as a minimum but not be limited'to the .

- following:

4 Establ.ish and adhere to .a preventive maintenance schedule

. a. '

,G regarding the subjec't circuit breakers. ,

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b. Have'the maintenance performed.by qualified personnel. Th'e . GE - .

E.[ power circuit breaker instruction manual should be used.as

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),' i gtii' dance in setting up the inaintenance procedures, , ,

4, i During the preventive maintenance, perform the recommended f -

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corrective actions described in the' enclosed GE Service. Alert Letter No ]75(CPDD) 9.3, dated' April 2, . ]979. A copy of this s., .

v letter is enclosed for you.r information and appropriate use.

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4. For facilities with an operatin lic'ense, a written report of tihe above actions, iricluding the da' e(s) when they will be completed,

$! shall be submitted within 30 days of receipt of this Bulletin. < ,

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", Date: April 17,-1979 Page 3 of 3

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$ 5. For facilities with a construction permit, a written report,of the J , , above actions, including the date(s) when they will be completed, d' shall be , submitted within 60 days of receipt of this Bulletin.'

Reports should be' submitted to the cDirector of the appropriate.,NRC- i 3 , -

Regional Office. . A copy of your report should be sent. to the thS.- >

i Nuclear Regulatory Comission, Office of ' Inspection and Enforcement,

[ Division of Reactor Operations Inspection, Washington, D.C.> 20555.

j, . ' Approved by GA0, B180225 (R0072); clearance expire.s '7/31/80. ' Approval f..

was given under a blanket clearance specifically fog identified g'eneric '

i: e problems. ' '

g,

Enclosures:

G

1. Copy of Text of General Electric < l t '

l '

, Electric Service Advice > >

k- Letter (SAL) No.175('CPDD) 9.3 ,

l ff , 2. List of IE Bulletins Issued (

3;:  ; in Last Twelve Months ,

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EXTRACT OF GE SERVICE ADVICE LETTER

• / NO. 175(CPDD)9. 3 o

An undervoltage device is used on some AK type breakers to trip the ,

breaker when loss of voltage occurs on the undervoltage device coil. The undervoltage device >is an' optional accessory for tripping the breaker and is used in some circuits in place of a shunt trip device because of the inference that it " fails safe" i.e., it trips the breaker when all normal sources of control voltage have become unavailable for shunt trip

- - type operations. Because of the many constraints imposed on the under- ,

voltage device, such as the need to withstand rated voltage continuously, '

to pick-up at 80 percent or rated voltage (industry standards now require  ;

pick-up at 85 percent of. rated voltage) and to drop out at 30 ' percent to ,

60 percent of rated voltage, both the undervoltage device and breaker l t

must be maintained at a high laval of p.erfor._m._ance to provide the assur-

, y ance the breaker will trip when voltage is removed from the undervoltage device coil. The following is recommended and except where the breaker is in warranty, should be performed at the customer's ' expense.

• ., l Refer To Figure'l

1. Check the undervoltage trip device to assure there i's not excessive clearance between the armature and the rivet and that there are no l binds as the armature moves through its travel wheri manually operated.

O, If excessive clearance or binding exists, it should be adjusted by ,

loosening screws (11) and moving the magnet (10) up or down as i necessary 'to obtain the proper freedom of the armature (3) with

~ respect to its pivot on magnet (10) and the guide provided by pivet

(.13 ) . , ,

i This

2. Check (and adjust if necessary) the trip ' latch engagement.

adjustment is described in the maintenance manual for that par- )

ticular breaker.

3. Check (and adjust if necessary) the pick-up setting of the instan-taneous undervoltage device. In some instances, the standards for l

l .'.. nominal voltage ratings and pick up settings have been raised since (f  ; the breakers were shipped from the factory. The new nominal volt-ages'and pick-up settings deviate substantially'from these values, r

' the device should be readjusted while' it is on the breaker.

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PRt -sp Setting Nominal Voltage .

106 125V DC 213 250V DC 102 120V AC 204.

, 240V AC To adjust the_picku p of the Astantaneous undervoltage trip de ,

remove the Loctics Wire (15) End turn the adjusting screw (14)

A suitable i

, clockwise to raise the picksup to the desired setting. 'l voldneter and adjustable voltage source sho ,

breakers or the secondary disconnects for drawout type breakers. j

On AC devir es, the pick-up voltage After should thebe pick-upread immediately is l before the armature closes its air . gap.

adjusted, locking wire (15) should:be installed. .

,t No adjustment is necessary on time-delay undl time-delay unit.

l

4. The torque required on the trip shaft to trip a' closed breakerTl

! should not exceed 1.5 pounds-inches. i 1

equivalent of an open-end wrench fabricated _from a' piece'o 'l metal to which a spring scale can be fastened approxima

,4 frpm the trip shaft centerline. i  ;

J

tiie breaker exceeds 1.5 poundinches, harden ,

have accumulated on the trip latch surface.be Excessive grease and replace

) CRC 5-56 or the bearings must be replaced. t

}{ dirt should be removed from the trip latch surface.

The adjustment between the undervoltage 5.

rYJ i L positive trip is maintained (positive trip exists when approxi-d mately 1/32 inch additional travel This of the armature adjustment is made occurs aft S' undervoltage device trips the breaker.)

h; with adjusting screw (20).

J.

D U, 6. The frequency of inspection of the invp1ved There-

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? grease is effective for the normal maintenance .

i' maintenance intervais.

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Attachment:

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