ML20101D060

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Change 2,Rev 5 to Procedure OP 2347A, Reserve Station Svc Transformer 15G-22S
ML20101D060
Person / Time
Site: Millstone Dominion icon.png
Issue date: 12/02/1983
From: Johari Moore
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20101D053 List:
References
TAC-51701, NUDOCS 8412210286
Download: ML20101D060 (17)
v • d • e


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Effective Date ea % 5tatio p perintendent STATION PROCEDURE OR FORpt CHANGE l

4 A. IDENTIFICATION PROCEDU " OR FORM NUMBER 23 hh /h MV. C M E No. A rcle One)

PROCEDURE OR FORn TITLE bESEXVE STAT)n/ SERVICE $RAMM l%~223 (Circle One)

INITIATED BY M 6MA

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. 8r I A crioN vtM IE G - T.1 R 4, a . , & n SG -?T * -

C. REASON FOR CHANGE yvfr6

k D. NON-INTENT CHANGE AUTHORIZATION (h/A for Intent Changes)

I' TITLE SIGNATURE OATE Shif t Supervisor (on outy)

E. REviEWE0 Department Mead 8. // 3 i Unreviewed Safety Question E luation Documentation Reoutred:

! (5ignificant change in procedure method or scope j as described in FSAR)

(If yes, doceent in PORC/50RC meeting einutes)

[ ] YES [(W

[

ENviR08stENTAL IW ACT i

l (Adverse environmental fapact) [ ] YE5

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[T2 l (If yes, doceent in PORC/50RC meeting einutes) l l F. PORC/50RC REcosteEWS APPROVAL (or confirmation of interia change within 14 days)

PORC/SORC Meeting Embed-IMNb G. APPROVAL AE IIFLEE NTATION l

The change is hereby implemented and is effective this date, encept for interia imp 1 1

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Q changes w Ehich hntedandeffectivepertheAuthorizationof0above.

15V 5tatlin 5 p rinidneent/ Unit 54perintendent ahla Date

( SF-302 new. 6 l 8412210286 841204 Page 1 of 1

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E.J. Mroczka 12-28-81

-l Form Approved by Station Superintendent Effective Date STATION PROCEDURE COVER SHEET A. IDENTIFICATION Number OP 2347A Rev. 5_

Title Reserve Station Service Transformer 15G-225 Prepared By R. Burnside B. REVIEW I have reviewed the above procedure and have found it to be satisfactory.

TITLE SIGNATURE DATE DEPARTMENT HEAD Nereo_ /7)Oh C. UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRED:

  • (Significant change in procedure method or scope as described in FSAR) YES [ ] N0 h (If yes, document in PORC/SORC meeting minutes) l -

ENVIRONMENTAL IMPACT (Adverse environmental impact) YES [ ] NO @ '

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

D. PORC/SGAC APPROVAL PORC/99RC Meeting Number J- IA- lle3 E. APPROVAL AND IMPLEMENTATION The attached procedure is hereby approved, and effective on the date below:

1)Ylf}] tate h Station /Sekvice/ Unit Superinfenent

~

/ Y3 Effdct19e Date SF-301 Rev. 5 l

- OP 2347A Pega 1 Rev. 5

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UNIT 2 RESERVE' STATION SERVICE TRANSFORMER 15G-22S

- PAGE NO. EFF. REV.

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PROCEDURE TABLE OF CONTENTS PAGE

, s- 7.1 Energizing RSST 15G-22S ** 5 7.2- Isolating RSST 15G-22S 5

- f.3 Manual Operation of 15G-2251-4 5 4

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OP 2347A Page 3

, Rev. 5

1. OBJECTIVE

. 1.1 To provide a procedure for startup, shutdown, normal and casualty operations of the Reserve Station Service Transformer.

2. LICENSE REQUIREMENTS 2.1 Refer to Technical Specifications 3/4.8.
3. REFERENCES 3.1 F.S.A.R. Chapters 8.

.9

4. PLANT OPERATING REQUIREMENTS
4.1 The reserve station service transformer is the preferred source of 6.9 KV and 4.16 KV power during periods of plant startup, shutdown and when the main turbine generator is off load or whenever the normal station service transformer 15G-2S is not available.

!* 5. PREREQUISITES l 5.1 R4 serve station service transformer 15G-22S 480 VAC auxiliary l power is available. (MCC 22-2A - MCC 22-1DA). Cooling equipment

is in automatic.

is 5.2 125 VDC control power in service.

5.3 Stati8nrelayingavailableasrequired.

5.4 Telephone communications as required.

5.5s.345 KV power available.

5.6 Data Logger Computer in operation. (Desired)

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 switchi,ng and tagging log to assure clearance of all tags on equipment to be energized.

. .. =. - . - -- - -_

2 OP 2347A Pagt 4 Rev. 5 6.4 Before energizing or de-energizing the reserve station service

' transformer 15G-22S clear switching with CONVEX.

6.5 Before. operating 15G-22SI-4 motor-operated disconnect be sure breakers 2253-2-2, 2253-3-2, 2252-25A-2, 2252-258-2 and 15G-2251-9 are open.

6.6 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 are removed, all protective relay targets are reset, potential' transformer fuses are -

installed arid all compartment doors are closed.

86T1_ , 86T2 _, 86T3 _ , and 86T4 6.7 . Verify 15G-22S 15G-225 15G-225 15G-22S are reset before attempting to close 15G-2251-4.

6.8 For forced oil-cooled (FOA or F0W) transformers with all pumps l

or fans or both inoperative, the following operating conditions are assumed to occur infrequently and without undue damage to i

i the transformer:

1. Rated load may be maintained for approximately 1 (one) l 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 ambient.
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 voltage may be maintained for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> at no load starting with the windings and oil at'30*C ambient.

6.9 For forced-oil-cooled transformer (FOA or F0W) ratings wi'h j

l part of coolers in operation, use the following:

Table 92.01-244 X of Total Coolers Permissible Load in X in Operations of Nameplate Rating 1

I

- - -. - . _ _ _ , . - . - ~ . . . . . _ . . _ . . _ . . . . . _ . . . _ . . . _ . . _ - . . . - - - , - - , - - _ . . _ . . . - _ - - - . . . . - - , . - - , - . , _ _ - - _ _ _ - _ _ _ _ . .

s OP 2347A Prg2 5.

.: Rev. 5 100 100 i 80 90

60. 78 50 '

70

40 60 33- 50 6.10 When racking a 4160 or 6900V breaker up or down, stand off to the side of the compartment,'use only the left hand for the racking operation, and turn your face away.
6.11 When opening or closing e 4160 or 6900V breaker locally, stand to the side of the compartment, extend only one are across the

= front of it and turn your face away. .

7. PROCEDURE 7.1 Energizing reserve station service transformer 15G-225-

.- 7.1.1 Check open the following:

a. 15G-22S1 "
b. 22S2-25A-2 and 22S2-25B-2
c. 22S3-3-2 22S3-2-2, 22S3-24C-2, and 2253-24D-2 j

7.1.2 Close 15G-2251-4 from Unit #1 GETAC as directed by CONVEX, and verify visually that the disconnect is

' -' closed.

7.1.3 Close low side breakers as necessary.

7.2 Isolatint, reserve station service transformer 15G-22S NOTE: Refer to Technical Specifications 3/4.8.

7.2.1- Open or check open 6.9 KV breakers 2252-25A-2 and 22S2-25B-2 as per OP 2342.

7.2.2 Open or check open 4.16 KV breakers 2253-3-2, 22S3-2-2, 22S3-24C-2 and 22S3-24D-2 as per OP 2343.

7.2.3 Open 15G-22SI-4 from Unit #1 GETAC as directed by CONVEX.

7.3 Manual operation of 15G-22SI-4.

i- CAUTION: When racking a 4160 or 6900V breaker up or down, stand off to the side of the compartment, use only l

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.- . . . ~ . . . - _ , . _ . _ . _ _ _ . - . _ . - , . _ _ - _ . . . . - . . _ . . - - . . . _ . _ _ _ _ _ - -

. e OP 2347A- Page 6 Rev. 5

' the left hand for the racking operation, and turn your face away.

CAUTION: When 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 awity.

7.3.1 Open, rack down, and remove Kirk Keys from the.

following breakers:

Breaker Kirk Key 2252-25A-2 C3 4 2252-258-2 C4 22S3-2-2 C5 22S3-3-2 C6 7.3.2 At Bus 24G, place Kirk Keys C3, C4, C5 and C6 into transfer interlock and remove Kirk Key C7.

7.3.3 At 15G-22SI-4, insert Kirk Key C7 and operate 15G-2251-4 by hand.

NOTE: After 15G-22SI-4 has been operated, Kirk Key C7 may be removed and placed into i transfer interlock device so as Kirk Keys

  • C3, C4, C5 and C6 can be removed and their associated breakers racked up and operated. -

i

8. ALARMS AND MALFUNCTIONS 8.1 RSST Lockout Channel I C08 A-3 RSST Lockout Channel II CD8 B-3 Channel I Initiating Device Setpoint 86T1 86T2 87T 15G-22S or 15G-225 15G-22S d A, B, C Differential Prot.

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OP 2347A P:ge 7.

,. Rev. 5-Channel II Initiatina Device Setpoint 3

"" 345 KV Wdg. overcurrent 50/51 22S 22S d, A, B, C 50

. Ground overcurrent 25 Hi-Side neut. overcurrent 51N-3 M 25 51 6.9 KV Wdg. ground 25 51N-2 4.16 KV Wdg. ground 15G-22S Action

. Auto I *

1. Trips and Lockout bkrs. 2253-2-2 and 22S3-3-2
2. Trips 2252-25A-2 and 22S2-25B-2
3. Starts both diesel generators.

. 4. Opens 15G-1T-2, 15G-4T-2 and 15G-T1-2 Initial

1. Verify above listed breakers trip and the diesel generators start.

Subsequent

1. Notify CONVEX.
2. Determine cause of trip by relay operations
3. Record and reset relays
4. Proceed as directed by CONYEX in order to restore the RSST to service.

8.2 RSST Undervoltage C08 C-3 Initiating Device Setpoint 27-l'or 27-2 Approx. 70% normal voltage

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OP 2347A Pcge 8

.. Rev. 5 Action Auto

1. Blocks closing 22S2-25A-2 and 22S2-258-2.

- 2. Block auto transfer of the in-houses buses to

.the RSST on a generator trip.

Initial

1. Verify undervoltage condition.

Subsequent

1. Determine the cause of problem.
2. After problem has been corrected, reset relays and restore RSST as per CONVEX instructions.

8.3 RSST Trouble C08 C-3 Initiatina Device Setpoint RSST Local Panel Common Alarm Drop Action Auto

1. None Initial
1. Monitor main control board indications of voltage, current, KW, etc., or other alarms to determine if a fault exists of the RSST.
2. Monitor RSST temperature and other parameters on the plant ,

data logger.

3. Dispatch an operator to the RSST local panel to determine

. what is in alarm.

Subsequent

1. Refer to subsequent action under individual RSST alarms.

8.3.1 RSST Power Supply #1 Failure Local Panel RSST Power Supply #2 Failure Local Panel Initiatina Device Setpoint Supply #1 Undervoltage 70% of normal voltage Supply #2 Undervoltage 70% of normal voltage

OP 2347A Page 9

. Rev. 5

. Action Auto

1. Transfer of power supply to the available source.
2. Cooling Power Auto Transfer Alarm.

Initial

1. Verify cooling power is available.

. Subsequent

1. Determine reason for loss of supply power, check local panel circuit breaker.
2. Check feed for Supply #1 at MCC22-2A/ Supply #2 at MCC22-1DA
closed.

. 3.. Notify Control Room of actions taken and indication of ,

breaker positions.

8.3.2 RSST Cooling Power Auto Transfer Local Panel Initiatina Device Setpoint Transfer Device Loss of selected Power Supply 7

Action Auto

1. Auto transfer of power to the available source.

Initial

1. Reset local alarm to enable future alarms to ant.unciate main control board "RSST Trouble Alarm".
2. Verify cooling power available.

Subsequent

1. Refer to OP.2347A 8.3.1.

8.3.3 RSST Control Power Failure Local Panel Initiating Device Setpoint Control Power Undervoltage 70% of normal voltage Action Auto

1. L'oss of RSST fans and oil pump.

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OP 2347A Page 10 Rev. 5 Initial l

1. Close or check closed control power circuit breaker and l power supply breakers.

- 2. Notify Control Room of indication and actions taken. -

Subsequent

1. If control power cannot be restored, remove RSST from service as per OP 2347A - 7.2.
2. Notify Maintenance Dept. and HELCO Test Dept. of the problem.

8.3.4 RSST Hi 011 Temperature Local Panel RSST Winding Hi Temperature Local Panel Initiating Device Setpoint Oil Temperature Detector 90*C (194*F)

Winding Temperature Detector 120*C (248'F)

Action Auto

1. None Initial
1. Reset local alarm to enable future alarms to annunciate main control board "RSST Trouble Alarm".
2. Observe local temperature indication.
3. Verify running or manually start the transformer fans (6) and oil pump (1).

, 4. Notify Control Room of indication and corrective actions taken.

j. Subsequent
1. If transformer temperatures cannot be reduced or controlled, reduce transformer loads in order to reduce the temperature.

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l

2. Notify CONVEX if transformer temperatures cannot be I controlled.

8.3.5 RSST Low Liquid Level Local Panel Initiating Device Setpoint Liquid level detector Low

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  • . OP 2347A Pcge 11 Rev. 5 l.

Action Auto

1. None Initial.
1. Reset local alarm to enable future alarms to annunciate main control board "RSST Trouble Alarm".
2. Observe local level-gauge, check for oil leaks.
3. Notify Control Room of indications.

Subsequent .

1. On a major oil leak where the ' transformer windings will be-uncovered, remove the RSST from service as per OP 2347A -

7.2.

2. On a minor oil leak, notify CONVEX and HELCO Test and maintain close observation of the leakage and oil level

. until corrective actions have been taken.

8.3.6 RSST Low 011 Flow Local Panel Initiatina Device Setpoint Oil Flow Detector 90%

i Action Auto

1. None Initial
1. Reset local alarm to enable future alarms to annunciate main control board "RSST Trouble Alarm".
2. Observe local flow indication at the pump and position of isolation valves.
3. Verify running or manually start the oil pump.
4. Notify Control Room of indications and corrective actions taken.

Subsequent

1. Monitor transformers temperature, reduce load to maintain temperature limit below the alarm point.
2. Notify CONVEX of the problem.

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OP 2347A Page 12 l

. Rev. 5 i

3. Notify-Maintenance Dept.

8.3.7 RSST Pressure Relief Operation Local Panel Initiating Device Setpoint i Pressure Relief Valve Valve Opening j Action l Auto

1. None.

Initial

1. Verify pressure relief has operatec and reseated.
2. Notify Control Room of indication and action taken.

Subsequent

1. Determine pressure increase is not due to an intern?1 fault in the RSST. ,
2. If an internal fault is indicated, notify CONVEX and proceed as directed.

8.3.8 RSST High Gas Volume Local Panel Initiating Device Setpoint Gas Volume Detector 200cc gas Action Auto

1. None -

l Initial

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

main control board "RSST Trouble Alarm".

2. Observe local gas volume detector indication.
3. Notify Control Room of indication.

Subsequent l 1. High gas volume could indicate an internal fault, notify l CONVEX of indication.

l 2. Proceed as directed by CONVEX.

l 8.4 RSST Primary Audio Tone T.T. Loss of Guard C08 A-4 l RSST Backup Audio Tone T.T. Loss of Guard C08 A-5 l

i l

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I OP 2347A Page 13 Rev. 5 Initiating Device Setpoint Tone Receiver Loss of guard signal or loss of Tone Receiver -

Action Auto

1. None Initial
1. Verify red guard light on C08R is out.

Subsequent

1. Notify CONVEX of indications
2. Proceed as directed by CONVEX 8.5 RSST Primary Audio Tone T.T. Trip Oper. C08 B-4 RSST Backup Audio Tone T.T. Trip Oper. C08 B-5 Initiatina Device Setpoint Tone Receiver Trip Line fault

. RSST fault Action Auto

1. Trips the following Breakers, 2253-2-2, 22S3-3-2, 22S2-25A-2, 2252-25B-2, 345 KV Breaker 15G-1T-2, 15G-4T-2, 15G-7T-2, and 15G-22SI-4.
2. Starts both Emergency Diesel Generators.

Initial

1. Verify that the above action takes place.

Subsequent

1. Determine cause of trip by relay operations.
2. Notify CONVEX and proceed as directed by the System Switching Supervisor.

8.6 RSST Audio Tone T.T. Test Switch in Test C08 C-4 Initiatina Device Setpoint Primary & Backup Mode Switch Switch in Test Action Auto

1. None

OP 2347A P ge 14 i Rev. 5 Initial

1. Verify that either the Primary or Backup Audio Tone T.T.

Receivers are being tested.

Subsequent

1. Ensure that the mode switch is returned to normal at the -

completion of the test.

8.7 345 KV Disconnect SW Air Press Low - C08 A-2 Initiating Device Setpoint PS 63 175 psig decreasing Action J

Auto

1. None Initial
1. Dispatch an operator to the Air Compressor Cabinet at 15G-22SI-4 to determine cause of alarm.

Subsequent i

1. If normal air pressure cannot be restored, notify CONVEX and proceed as directed.
NOTE
The MOD can be operated under voltage conditions without quenching air but will be damaged and must be inspected before further operations.
2. Natify Maintenance Dept. for repair of air supply system.

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