ML20101D056

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Change 2,Rev 4 to Procedure OP2347B, Normal Station Svc Transformer 15G-2S
ML20101D056
Person / Time
Site: Millstone Dominion icon.png
Issue date: 08/30/1984
From:
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20101D053 List:
References
TAC-51701, NUDOCS 8412210285
Download: ML20101D056 (18)
v • d • e


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Fors App 8thf en/gy 5tatippuperintendent a i ri:

Effective Date

- $1AT10h Pe0CEDutt OR F0tp CNANCE (

. . 1 A. 10!WTIFICAT]DN 1

PROCEDURE OR FORM NLMBER OO[349 b REV.CMMIGE 4 80. b '

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s PROCEDutt QR FotM TITLE w

<C<rc's One) isc -2,s e u. a.r y INITIATED BY_ O* > _O g . * =

C. REASON FOR CHANCE h% l g% W Af , o 189 -o 2 -d g

r D. a04-INTENT CNueCE AUTHORIZATION (K/A for Intent Changes) -

TITLE 11CRATutE SATE Shift Seervisor (en duty)

E. REVIEWED l . SePartment Mead f, & _

,1, finreviewed safety Questien tva ' '

tien noementation teosired:

i (51gnificant cha in procedwre method er scope

[]TES [ W

( as describes in SAR) .

(If yes, doceent in P0tC/50tC meeting ofnetes)

DrvitoesqENTAL !wACT

'(Adverse envirormental teact) { ] VES [ ,

(If yes, doceent in P0tc/50RC asettag afnetes)

-f.-N/50tc SECOs00e1 APPRDVAL1er tentfruatten nfinterfe dange erf9fn144) ,

P0tC/50RC Heetf ag Ember ,"J '-ENO

4. APPt0 VAL me 1*LDENTATION The change is hereby feptemented and is effectfee tAfs este escept for letarle re laplemented and effective per the AutherI3atten of 3 above.

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, (If yes, doceent in P00C/500C netting minuten)

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(If yes, decaent in P0tC/50tc emetfag minutes)

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90tC/50tC Restfng Emberh*b *k i S. APPtevAt Ale leLDEWTATIon The f.henge is hefgby fgfamented and is effective thfs date, encept for laterle s umf f T nted and af fee per the Awt&orfastion of 8 above. - .

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., . , 8 ATTACHMENT TO GEE-84-1311

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, F *.U 0S E E F P.'I S I 0t TO OF2347B

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1. C .anec i te , "E.2 f..$ . 5.1. Unde rvol t age", to i ten B.2 (b)

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2. Add nen- iter. S.2(a) to read as follows: '
  • 6.2 (a) N.S.S.T. Degraded Vol tage '

. C04L CA-8

,vr initiating Device set Point Computer Print-342g y EE032

. Bus 24 A/B (4.16KV)

Action Auto *

1. None' initial
1. Verify proper operation of the turbine generator and its exciter per Procedure OP3234A.

( 2. Verify actual degraded voltage condition by observation of .

L bus voltmeters. '

Bus 24A, B, C, D, s E 3620V Bus 22E s F , 424V l

If possible reduce affected busses loads to increase voltage.

. 3 -

4. (a) Call Convex to raise 24'tV Cenerator Voltage / Increase VAR l output. .. ..

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4. (b) Call Convex to raise system voltage.

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l 5 Inform Duty officer if Degraded voltage persists.

900TE: ^ T/ff".ssber DL42RDRTJonl Vol74'6 FOR JAfETY ElLRT&O MOTod,$ TS aff % of 99Y68 V0ZT$dd,.

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'~ tg ATTACHMENT TO GEE-84-1311 c Pcga 2

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i Subsecuent

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1. Determine cause of degraded voltage condition and log '

reason, action taken, and time period taken to restore normal voltage.

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E.J. Mroczka 12-28-81

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Form Approved by Station Superintendent Effective Oste' 'i j;

~ STATION PROCEDURE COVER SHEET '.

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A. IDENTIFICATION . j

'l Number OP 2347B Rev. 4_

Title Normal Station Service Transformer 15G-2S (N.S.S.T.)

Prepared By R. Burnside

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B. REVIEW I have reviewed the above procedure and have found it to be satisfactory.

~

TITLE SIGNATURE DATE -- a DEPARTMENT HEAD /!f!b i

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C. UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRED:

(Significant change in procedure method or scope I( as described in FSAR) YES [ ] NO #

(If yes, document in PORC/SORC meeting minutes) l ENVIRONMENTAL IMPACT

+'

(Adverse environmental impact) . YES [ ] NO W (If yes, document in DORC/SORC meeting minutes)

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1 D. PORC/SORC APPROVAL , _ .$

-PORC/60RC Meeting Number d-83-I N[i

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E. APPROVAL AND IMPLEMENTATION The attached procedure is hereby approved, and effective a the date below:

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. G5tation/S1llirvice/ Unit Superintendent Effe'ctive Date .

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  • s OP 2347B Paga 1 Rev. 4

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UNIT 2 NORMAL STATION (ERVICE TRANSFORMER 15G-25 (N.S.S.T.)

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, PAGE NO. EFF. REV. -

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. OP 2347B Paga 2 Rev. 4

' (l PROLEDURE TABLE OF CONTENTS ,  :

1

  • 1 PAGE s

7.1 Energizing N.S.S.T. 15G-25 5

.. 7.2 De-energizing N.S.S.T. 15G-25 5 .

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OP 23478 Paga 3 j 

             -,                                                                      Rev. 4
              .                                                                                                                                                 -i
1. -0BJECTIVE 1.1 To provide a procedure for startup, shutdown, normal and ,

casualty operations of the Normal Station Service Transformer . y , (N.S.S.T.).

2. LICENSE REQUIREMENTS 2.1 Refer to Technical Specifications 3/4.7.

1

3. REFERENCES 3.1 F.S.A.lh Chapter 8.
y. i,
4. PLANT OPERATING REQUIREMENTS 4.1 The N.S.S.T. is the preferred source of 6.9-KV and 4.16-KV power during Turbine Generator at power operations.
5. PREREQUISITES 5.1 125 VDC control power in service.
    '(                    5.2 Station relaying available as required.

5.3 Telephone communications as required. 

                                                                                                                                                              ~

5.4 Cooling Supply Power from MCC 22-2A and MCC 22-1DA is available and Cooling Control in Automatic. l 5.5 Data Logger Computer in service (desired). l 5.6 N.S.S.T. N2 Gas bottles pressure between 500 psig and 2000 psig and gas system in service. Normal tank pressure range 1.0 psig - _ . w to 1.5 psig. i - 5.7 Verify Transformer Deluge System available for service.

6. PRECAUTIONS 6.1 Before racking out any low side breaker, check to make sure the ,

breaker is open. 6.2 Do not close breakers locally without contacting Control Room Operator. 6.3 Check switching and tagging log to assure clearance of all tags on equipment to be energized. L r 

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OP 2347B Paga 4 Rev. 4 b 6.4 Before energizing any equipment following maintenance, a visual inspection will be made to ensure that all portable grounds have been removed, all bus compartment panels have been replaced, . all breakers on the equipment are open, all foreign objects from in and around the equipment have been removed, all protective relay targets are reset, potential transformer fuses are installed and all compartment doors are closed. i 6.5 N.S.S.T. will be energized anytime the turbine generator is energized, except whenever the isolated phase links between the generator terminals and N.S.S.T. terminals have been removed. . 6.6 For forced-oil-cooled (FCA or F0W) transformers with all pumps or fans or both inoperative, the following operating conditions

are assumed to occur infrequently and without undue damage to .<

the transformer:

1. Rated load may be maintained for approximately 1
  .                                                 (one) hour following normal operation at nameplate

,'. rating at 30*C ambient. ( '

2. Rated load may be carried for approximately 2 (two) hours if started with the windings and oil at 30*C l - ambient.

I

3. Rated voltage may be maintained for 6 (six) hours at no load, following continuous operation at nameplate rating at 30*C ambient with cooling equipment in operation. .
4. Rated voltags may be maintained for 12 hours at no load starting with the windings and oil at 30*C i ambient.

6.7 For forced-oil-cooled transformers (FOA or F0W) ratings with part of coolers in operation, use the following: , Table 92.01 - 244 

                                          % of Total Coolers in Operation                                                Permissible Load in %

of Nameplate Rating 

                           .c*

100 100 80 90 b 60 78 b L 

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OP 2347B Pagn 5 Rev. 4 50 70 4 40 60 33 50 . 6.8 Do not exceed the low side rates of X-Wdy 6.9KV 30MVA 2513 i amps, Y-Wdy 4.16KV 15MVA 2084 amps. 6.9 When -racking a 4160 or 6900V breaker up and down, stand off to the side of the compartment, use only the left hand for racking operation, and turn your face away. 6.10 Whenever opening or closing a 4160 or 6900V breaker locally, 

                    .                      stand to the side of the compartment, extend only one arm                                      ,
    ~

across the front of it and turn your face away. - s

7. PROCEDURE 7.1 Energizing N.S.S.T. 15G-2S.
7.1.1 Verify N.S.S.T. low side breakers, 2S2-25A-2, 252-258-2, 2S3-24A-2 and 2S3-248-2 are open.

[ 7.1.2 Refer to OP2324A for Turbine Generator Excitations operations which will energize the N.S.S.T. 7.2 De-energizing N.S.S.T. 15G-25. l' , NOTE: ,In order to de-energize the N.S.S.T. during normal conditions, the Turbine Generator must be removed from service and its excitation de-energized. 

                                            '.'. 2.1       Refer to OP2342 for 6.9-KV oreakers and OP2343 for                       ,

4.16-KV breakers operations. _ 7.2.2 Refer to OP2324A for Turbine Generator Excitations - 

                 ~

removal from service.

8. ALARMS AND MALFUNCTIONS 8.1 N.S.S.T. Lockout Channel I CD8 A1 ,

Initiating Device Set Point 86T1 or 86T2 - - 15G-25 ,15G-25 (87T-A) (87T-B) (87T-C) Transformer Differential b 15G-25 

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OP 23478 Page 6 Rev. 4-N.S.S.T. Lockout Channel II C08 B1 Initiating Device Set Point 87T3 or 86T4 - - W2S W 2S 50/51T- B), (C) High Voltage Overcurrent _ _ 50/51T- B'(}

l. Grounding Transformer Overcurrent _ S3 Low Voltage Ground Fault 6.9KV 2

' ~ s. i Low Voltage Ground Fault 4.16KV 3 . Action . Auto

1. Trips Turbine Generator.  ;

( 2. Trips Auto Transfer Trip Channel I & II of Main Transformer, which trip 15G-8T-2 and 15G-9T-2. l , 3. Trips 2S2-25A-2 and 252-258-2, 6.9-KV breakers.

4. Trips and lockouts 253-24A-2 and 253-24B-2, 4.16-KV breakers.
5. Trips and lockouts of the Generator Field Breaker. .
6. Initiates transfer of stations service loads to the -

+ - . Reserve Station Service Transformer. Initial

1. Verify all auto actions take place.
2. Initiate OP2502 Emergency Shutdown Procedure if plant load was greater than 15% F.P. at time of trip. , ,

Subsequent Determine cause of trip by observation of relay targets, 1. record targets and relay drops.

2. Notify CONVEX, and Maintenance Department of problem.
3. After problem has been corrected, reset targets and b relays.

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OP 2347B Pige 7 Rev. 4

4. Reset Lockout relays 86T1, 86T2, 86T3 and 86T4.
5. Restore system to normal as per OP23478.

NOTE: For operation without the N.S.S.T. . If the N.S.S.T. cannot be restored to service, it may be isolated by removing the removable links in the isolated phase bus. This would need a special maintenance procedure and operating procedure. 8.2 N.S.S.T. Undervoltage C08 C1' Initiating Device Set Point 2_7X-1 and 27X-1 (6.9KV) < 70% of normal 15G-252 15G-2S2 27X-1 and' 27X-1 (4.16KV) < 70% of normal 15G-2S3 15G-2S3 Action Auto

1. Blocks closing of the following breakers: .

C 2S3-24A-2, N.S.S.T. to Bus 24A 253-24B-2, N.S.S.T. to Bus 24B + 2S2-25A-2, N.S.S.T. to Bus 25A 2S2-25B-2, N.S.S.T. to Bus 25B - Initial

1. Verify proper operation of the turbine generator and its exciter. -
2. Verify actual undervoltage condition by observation of bus voltmeters.
3. If possible reduced affected buses loads to restore voltage to normal.

Subsequent

1. Determine cause of undervoltage and correct. ,

8.3 N.S.S.T. Trouble C08 0-1 Initiatina Device Set Point N.S.S.T. Local Panel Common Alarm Light 

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DP 23478 Pago 8 Rev. 4 

               '               ",                                                                                                                                                                                                                                                  2 b                               Action Auto
                                                 - 1.      None.                                                                                                                                                                                                 .

Initial j l ,

1. Monitor main control board indication of voltage, current, j

! KW, etc. , or other alarms to determine if a fault exists . 

                                                          .on-the N.S.S.T.                                                                                                                                                                                                             j
2. Monitor N.S.S.T. Lemperature and other parameters on the plant Data Logger.

. 3. Dispatch an operator to the N.S.S.T. local common, alarm i ~ light panel to determine what the alarm is. - 

                                                                                                                                                                                                                                                                                  ']

Subsequent .

1. , Refer to. Subsequent action under individual N.S.S.T.

I alarms. 8.3.1 N.S.S.T. cooler Power Auto Transfer Local Panel 2

Initiating Device Set Point
Transfer Device Loss of selected power supply
.{ -

Action Auto

1. Automatic transfer of power to the alternate source.

Initial

1. Reset local alarm to enable future N.S.S.T. alarms to annunciate main control board "N.S.S.T. Trouble".. /~ .
                                                                                                                                                                                                                                                  '               _v_---qs
2. Check closed breakers 8C-2, 8C-3 on local panel. < ~1 N' d 4
3. Check for blown fuses, FU-1, on local panel. -

!. 4. Check closed power supply breakers on MCC22-2A and MCC22-1DA.

5. Insure fans and pumps are running as applicable.

Subsequent .

1. If cause of trouble cannot be ietermined, notify Maintenance Department.
8.3.2 N.S.S.T.

High Combustible Gas Initiating Device Set Point 

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OP 2347B Pagn 9 

         ,                                                              Rev,. 4 Fault Gas Monitor               1%

Action 

                              -Auto                                                                             -
                               -1. None.'

Initial

1. . Reset local alarm to enable future alarms to annunciate Main Control Board "N.S.S.T. Trouble".
                              ' 2.   ~ Observe local fault gas monitor indication.
3. Notify Control Room of indication.

A.

  • Classification of Total Combustible Gas Reading TCG Reading % Course of Action -

0 - 0.5 No Action 0.5 - 1 Caution: Close surveillance for upward Trends 1 - 5 Investigate cause immediately (.- 

                                                                                                                           ~

i 5 - Remove transformer from service until cause is located and remedied 4 Subsequent

1. High fault, gas monitor reading could indicate an internal -

fault, notify CONVEX of indication. I 2. Proceed as directed by CONVEX. - 

                                                                                                         ~

8.3.3 N.S.S.T. Hi-Lo Tank Pressure Indicating Device Set Point Pressure Sensor Hi 3.0 psig Pressure Sensor to .25 psig Action . Auto 

                                                                                                                         ~
1. None.

Initial

1. Reset, local alarm to enable future alarms to annunciate main control board "N.S.S.T. Trouble".
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OP 2347B P ga 10 Rev. 4

2. Observe local gas regulator pressure, tank l'iquid level and winding temp.
3. Notify Control Room. .
Subsequent
1. Hi Tank pressure could result from a failed nitrogen regulator or an internal / external fault (normal range is 1.0 psig to 1.5 psig) or from increasing transformer load.

! 2. If there is an internal or external fault, notify CONVEX ! and proceed as directed.

3. 'If N2 regulator has failed, replace same as per General Electric instruction manual for the N.S.S.T. after notifying CONVEX of,the malfunction.
4. If tank pressure is low, have Electrical Maintenance carry out the required adjustment. If regulator has failed,

[ repeat subsequent action step (3). If N2 bottle is 

   .                                     exhausted, replace same.

8.3.4 N.S.S.T. Liquid Temp N.S.S.T. Winding Temp (Y) Local Panel N.S.S.T. winding Temp (X) 

                -                               Initiating Device              Set Point
1. Oil Temp. Detector 90'C
2. Winding Temp. Detectors 105*C Action _

Auto . N'

1. None.

Initial

1. Reset local alarm to enable future alarms to annunciate Main Control Board "N.S.S.T. Trouble". .
2. Check local temperature indicators.
3. Check cooling fans and oil pumps operating select " hand" operation for cooling fans and oil pumps at local panel, if necessary.
4. Check closed cooling fan and oil pumps CKT Bkrs. at local b panel 8C-4, 8C-5, 8C-6, 8C-7. .

1 

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OP 23478 Psga 11 J Rev. 4 Subsequent

1. If temperature control cannot be regained, notify CONVEX.
2. If temperature exceeds 105'C on NSST 6.9 KV windings, .
monitor temperature. If temperature exceeds 115*C, transfer one 6.9 KV bus to the reserve station service transformer.

8.3.5 N.S.S.T. Pressure Relief Indicating Device Set Point Pressure Relief Value (red light) > Spsi Action Auto p

1. Relieve overpressure condition in the tank.

Initial l

1. Reset local alarm to enable future alarms to annunciate i Main Control Board "N.S.S.T. Trouble".
2. ~ Observe which relief value has lifted, verify overpressure condition has been corrected and check that relief valve i(

has reset. l 3. Notify Control Room. Subsequent

1. Follow applicable portions of 09 Procedure, Section .

8.3.3.1 and 8.3.3.2 initial and subsequent action as to causes,and corrective action for tank overpressure. 8.3.6 .N.S.S.T. Liquid Level Local Panel - 

                                                                                                                                                                                                             # ,. m i4
                                   .-                                                                        Initiating Device                  Set Point                                                  ,

Liquid level gauge . Low Mark Action Auto

1. None. .

L l Initial

1. Reset local alarm to enable future alarms to annunciate l

Main Control Board "N.S.S.T. Trouble".

2. Check local level indications.
3. Check N.S.S.T. for oil leaks.

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OP 23478 Page 12 

      +                                                                                 Rev. 4 9

Subsequent

1. ' _On a major oil leak where the transformer windings will be uncovered, notify CONVEX and proceed to remove the N.S.S.T. .

from service.

2. On a minor oil leak, notify CONVEX and closely observe oil level until corrective action has been taken. j 8.3.7 N.S.S.T. loss of liquid flow Local Panel
    .                                                       Initiatina Device                Set Point Liquid flow gauge                Less than 90% normal Action                                                                                                                         (:

Auto - l

1. None.

, Initial

1. Reset local alarm to enable future alarm to annunciate i

Main Control Board "N.S.S.T. Trouble". ! 2. Check oil pumps operating.

3. Check breakers 8C-6, 8C-7 on local panel closed.

4 b 4. Check oil pump overloads reset. l

5. Check oil level.

l Subsequent

1. Place oil pumps in manual, if oil pumps will not run or L flow alarm will' not clear, notify Maintenance Department.

I

2. Notify CONVEX.

8.3.8 N.S.S.T. Loss of Control Power Local Panel . _ , .

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  • Initiating Device Set Point R' -w Control Power Undervoltage Less than 70% normal Action Auto
1. Loss of N.S.S.T. Cooling fans and oil pumps. . .
2. Loss of fault gas monitor.
                                                                                                                                                        ~

i 3. Loss of local panel heaters, lights and convenience outlets. Initial

1. Reset local alarm to enable future alarms to annunciate
h. Main Control Board "N.S.S.T. Trouble".

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b = OP 2347B Pcgn 13 Rev. 4

2. Check closed circuit breakers 8C-1, 8C-2 and 8C-3 on the local panel.
3. Check for blown fuses, FU-1, on local panel. -
4. Check closed power supply breakers on MCC22-2A and MCC22-IDA.

Subsequent - If control power cannot be restored, notify CONVEX and 1. proceed as directed to remove the N.S.S.T. from service. 8.3.9 N.S.S.T. Low Gas Cylinder Pressure Local Panel Initiating Device Set Point - Pressure Switch 63GC 200psig l Action , Auto

1. None.

Initial

1. Reset local alar = to enable future alarms to annunciate Main Control Board "N.S.S.T. Trouble".
2. Verify N.S.S.T. tank pressure as normal.

(

3. Verify low pressure condition of the N2 gas cylinder.

Subsequent

1. Notify Control Room of indications.
2. Replace the spent N2 gas cylinder with a full one.
3. Check system for leaks.
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