ML20138J300

Change 1 to Rev 5 to Procedure OP2347B, Normal Station Svc Transformer 15G-2S (Nsst)

ML20138J300
Person / Time
Site:	Millstone
Issue date:	08/15/1985
From:	Keenan J NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20138J272	List: B11803, Forwards Change 1,Rev 5 to Procedure OP2347B, Normal Station Svc Transformer 15G-2S (Nsst). Encl Change Suppls 841204 Submittal Re Procedures for Degraded Grid Voltage ML20138J300
References
TAC-51701, NUDOCS 8510290308
Download: ML20138J300 (20)

Text

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f are Apvo,M gy 5tapn superintencent Effsctive Date STATION Mt0CE00RE OR F0 eat CHANCE A. IDENTIFICATION V@ PROCEDURE OR FORM NUMBER _ CM 2 3Y 7 A REv.

(Circle One) 5 CaANcE NO.

/

• PROCEDURE OR FORM TITLE bw (Circle One) bd mn INITIATED BY __ / W j

.nra .as ca. 6. .s.r) hc C. REASON FOR CHANCE

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Ck 0 *fh *9~ Q 2. "0 L L P$ Wm..nd d % C &p e. M k T- W?

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MON-INTENT CHANGE AUTHOR 12ATIDW (N/A for Intent Changes)

TITLE SIGNATURE DATE .

, * [.

, _ Shift Supervisor (on duty)

.- .., .5

. E. REVIEVED

' '.* Department Head 8.

- 8/ ,.

unreviewed Safety Questi Evaluation Documentation Required: *

.' (Significant change in procedure method or scope -

as described in FSAR)

(If yes, stari-nt in PORC/SORC meeting minutes) [ J YES Qd NO '

i

~

ENVIROW4 ENTAL IMPACT

,i

.: (Adverse environmental impact)

' (If yes, document in PORC/50RC meeting minutes) [ ] YES [)(NO - l E .*~/s F. INTEGRATED SAFETY REVIEW REQUIRED f.

,m.. .

[ j

~C _

(Affects msponse of Safety Systaas, performance i;

47 .

of safety-related control systems or performance

[ ] YES [4 No j g fe . : of control systans which may indirectly affect e

g:

C6 safety systaa response.) .

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f@fd.,

(If yes, enciment in PORC/50RC meeting minutes.)

hl r '

,- E.

PORC/50RC REcomENDS APPROVAL (or confirmation of interia change within 14 dys) e (,

PORC/SORC Meeting Nimber)'I"/7h ~

N.

< APPROVAL AND IMPLEMENTATION

+ The change is hereby implemented and is effective this date, except for interia i changes which were implemented and effective per the Aut riz ion of D above.

w .3. / w&

5tay Superintenodt/ unit 5 per/ttencent F// DaterY .

SF 302 8510290308 851016 . . ..

amer 7 - a.

PDR ADOCK 05Cg3 6 Page I of I P

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DECRADED VOLTACE (DRAPT)

Addition to OP 2347B 8.2(a) NSST Degraded Voltage C04L CA-8 Initiating Device Setpoint Computer Point s

>3620 volts '

EE032 (90% + 20V)

Bus 24 A/B (4.16KV)

• • And/or the following alarms **

ESAS UV 2A Trip Bus 24D COI A-44 ESAS UV 2B Trip Bus 24D COI B-44 ESAS UV 2C Trip Bus 24D Col C-44 ESAS UV 2D Trip Bus 24D COI D-44 Initiating Device Setpoint 70% for .5 sec. or 88% for 8 sec.

UV 2 Bistable BA113 85.5 VAC or 106 VAC for 8 seconds UV 2 Bistable BA213 85.5 VAC or 106 VAC for 8 seconds UV 2 Bistable BA313 85.5 VAC or 106 VAC for 8 seconds UV 2 Bistable BA413 85.5 VAC or 106 VAC for 8 seconds ESAS UV 1 A Trip Bus 24C COI A-43 ESAS UV 1 B Trip Bus 24C COI B-43 -

ESAS UV 1 C Trip Bus 24C COI C-43

• ESAS UV 1 D Trip Bus 24C COI D-43 Initiating Device F' Setpoint 70% for .5 sec. or 88% for 8 sece $,l UV 1 Bistable BA112 ..

' 85.5 VAC or 106 VAC for 8 seconds .

UV 1 Bistable BA212 f 85.5 VAC or 106 VAC for 8 seconds ./

UV 1 Bistable BA312 85.5 VAC or 106 VAC for 8 seconds DV I Bistable BA412 -l 85.5 VAC or 106 VAC for 8 seconds g-5:.

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NOTE:

8.

The computer voltage alarm EE032 may be the first alarm due to a degraded condition. The ESAS alarms could precede or follow if the grid voltage continues to fall.

With a voltage of 3520 volts (88%) for a time period of 8 seconds; the RSST feeder breaker will open.

['

If the grfd voltsge falls to 2820 volts the ESAS alarms will come in.

Buses 24C and 24D will load shed and both diesel generators will start.

ACTION:

Auto .

1. None

_ Initial

1. Verify proper operation of the Turbine Generator and its exciter per procedure OP 2324A.

2. Verify actual degraded voltage condition by observation of bus voltmeters.

Bus 24A,B,C,D.E <3620 volts Bus 22E,F <424 volts

3. a) Call convex to raise 24KV generator voltage / increase VAR t

output.

b) Call convex to raise system voltage.

4.

Af ter 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of degraded voltage (<3620 volts on bus 24A,B,C,D, E) complete the following. '

a) lockout the RSST feeder breaker to the 4KV bus (24C or 24D),

whichever is supplying bus 24E.

b) t Start the diesel generator on the 4KV bus (24C or 24D), i whichever one is supplying bus 24E, per OP 2346A.

i c) Match diesel generator load with bus load. [;

d)_ K Open bus. the tie breaker to the non-vital loads on the affe,cted g, J L_. affected bus.

The tie-breaker also disconnects the NSST from the .e cc EL . e) Raise J diesel generator output voltage and frequency to T' normal rimning conditions. ,,

f) Trip the ESAS undervoltage module for the affected bus.

?,,-

~ [?

' y NOTE:

If the undervoltage module is not tripped and if an SIAS were to b

$I occur, the starting of HPSI, LPSI and Containment Spray Pumps *y would overload the diesel generator. '

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_ _ _ - m _ _ _ _- _m , - ,

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NOTE:

The above steps are protecting two out of three pumps from undervoltage. Only one of the two pumps are running at any time on the affected buses.

No safety related pumps (HPSI, LPSI, Containment Spray) are running. All surveillance on operating and safety related pumps f

\

and motors are to be secured.

5. After 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> of degraded voltage and if reactor / turbine has not occurred, manually trip reactor / turbine.

SUBSEQUENT

1. Determine cause of degraded voltage condition and log reason, action taken and time period to restore normal voltage.

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4

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2-ENG-1.44 Rev. 0 l Page 1 of I  ;

Attachment IB l MP2 PDCR Routing / Review woc.es .

This M will be presented to PORC on ek//6/8[ ~

PORC Member Routing - O MMy # A If no response is received by Md340 , it is assumed that there is not comment.

R,. W. Bates D. C. Kross F. R. Dacino J. J. Parillo J. S. Keenan R. A. Place J. J. Kelley Department Design Review (completed prior to PORC) This design review involves a face to face discussion including these topics as a minisme.

2) The problem to be resolved 2) The design intent 3) Installation

). 4) Repair ease during operations 5) Dperational Concepts 6) Test Program cnd Procedures.

Operations -

Signature Maintenance Signature Instrumentation Signature -

Production Test Signature if required Betterment Signature if required '

Quality Control Signature  :

pg i a2 -

P 4

• '* E. J. Mroczka

'# 2-1-85 Fcra Apprsvid by Statien Sup::rintendent Effective Date STATION PROCEDURE COVER SHEET

) A. IDENTIFICATION )

Number OP 2347B Rev. 5 Title NORMAL STATION SERVICE TRANSFORMER 15G-2S (N.S.S.T.) '

Prepared By R. H. Burnside

.?

i B. REVIEW \

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

TITLE SIGNATURE DATE DEPARTMENT HEAD b J!7!8r

&Auw /' f Os* % ke un/ec

</

C.

UNREVIEWED SAFETY QUESTION EVALUATION DOCUMENTATION REQUIRED:

(Significant change in procedure method or scope as described in FSAR)

YES [ ] NO ((

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

t (Adverse environmental impact)

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

YES [ ] NO [ [

D.

INTEGRATED SAFETY REVIEW REQUIRED (Affects response of Safety Systems, performance of safety-related control systems or performance YES [ ] NO ((

of control systems which may indirectly affect

-safety system response.)

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

E.

PROCEDURE REQUIRES PORC/SORC REVIEW YES [ g NO [ ] ,(.

F. PORC/SQRC APPROVAL k

F i

PORC/SGRE-Meeting Number 2-86-39 '

[.

G. APPROVAL AND IMPLEMENTATION li The attached proEedure is hereby approved, and effective on the date below: E Y,

e f

Station / Service / Unit Superintendent 3fE2 W .

. Effective Date SF 301 Rev. 7' f, ,

Page 1 of 1 .

= 9 ,'

OP 23478 Page 1 Rev. 5 g-UNIT 2 NORMAL STATION SERVICE TRANSFORMER 15G-25 (N.S.S.T.)

Page No. Eff. Rev.  ?-

1 - 14 5

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OP 23478 Page 2 Rev. 5

}. -

TABLE OF CONTENTS

7. PROCEDURE PAGE 7.1 Energizing N.S.S.T. 15G-25 s 5

7.2 De energizing N.S.S.T. 15G-2S 5 5

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OP 2347B Page 3 Rev. 5

) 1. OBJECTIVE 1.1 To provide a procedure for startup, shutdown, normal and casualty operations of the Normal Station Service Transformer (N.S.S.T.). .

[.

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

3. REFERENCES 3.1 F.S.A.R. Chapter 8.

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.

i 5.3 Telephone communications as required.

5.4 Cooling Supply Power from MCC 22-2A and MCC 22-1DA is available i

and Cooling Control in Automatic.

5.5 Data Logger Computer in service (desired).

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 g

to 1.5 psig.

f, 5.7 Verify Transformer Deluge System available for service.

S e'

.s c.

6. PRECAUTIONS N

6.1 Before racking out any low side breaker, check to make sure the pr breaker is open. {

6.2 Do not close breakers locally without contacting Control Room g Operator. $

6.3 $

Check switching and tagging log to assure clearance of all tags  ?

on equipment to be energized.

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OP 23478 Page 4 Rev. 5 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.

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 (FOA or F0W) transformers with all pumps i 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 carrist'. .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 E-load starting with the windings and oil at 30 C '

ambient.

s $i 6.7 ^

For forced-oil-cooled transformers (FOA or F0W) ratings with

~

part af coolers in operation, use the following: [

- Table 92.01 - 244

((

% of Total Coolers in Operation Permissible load in %

of Nameplate Rating :v 3-r-

F

OP 2347B Page 5 Rev. 5

~[) -

100 100 80 90 60 78 50 70 40 '

60 '

33 50 6.8 Do not exceed the low side rates of X-Wdy 6.9KV 30MVA 2513 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.

7. PROCEDURE 7.1 Energizing-N.S.S.T. 15G-2S. .

7.1.1 Verify N.S.S.T. low side breakers, 252-25A-2, 2S2-25B-2, 2S3-24A-2 and 2S3-248-2 are open. 9 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. .

NOTE:  :

In order to de-energize the H.S.S.T. during normal conditions, the Turbine Generator must be removed E.:

/*.

from service and its excitation de energized. .?

v:.

' 3-7.2.1 ,

f+

Refer to OP2342 for 6.9-KV breakers and OP2343 for -

4.16-KV breakers operations. 94 7.2.2  ?.

Refer to OP2324A for Turbine Generator Excitations removal from service. (( '"

9'.

lh 4

. 9

. . ~ . . . . -

.,a OP 2347B Page 6 Rev. 5 i h 8. ALARMS-AND MALFUNCTIONS 8.1 N.S.S.T. Lockout Channel I C08 Al  ;

Initiatina Device Set Point

_86T1 or 86T2 - -

15G-25 15G-2S .\

Transformer Differential (87T-A) (87T-B) (87T-C) 15G-25 N.S.S.T. Lockout Channel II C08 B1 Initiatino Device _ Set Point t

87T3 or 86T4 - -

EU~2S EF2S High Voltage Overcurrent 50/51T- ), (C)

Grounding Transformer Overcurrent 50/51T-A B , (C)

Low Voltage Ground Fault 6.9KV 5 N-  :

2 Low Voltage Ground Fault 4.16KV 5 15G-2 3 Action ,

Auto

1. Trips Turbine Generator. $

2. hi Trips Auto Transfer Trip Channel I & II of Main Transformer, s which trip 15G-8T-2 and 15G-9T-2. , h v-3.

Trips 2S2-25A-2 and 2S2-25B-2, 6.9-KV breakers. g

4. 7:.

Trips and lockouts 2S3-24A-2 and 253-248-2, 4.16-KV breakers. s.

5.  %-

Trips and lockouts of the Generator Field Breaker. ,%,

• i-

6. j-i Initiates transfer of stations service loads to the Reserve $'

Station Service Transformer.

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OP 23478 Page 7 Rev. 5 h Initial-

1. Verify all auto actions take place.

2.

Initiate E0P 2525 Standard Post Trip Actions if plant load was j

greater than 15% F.P. at time of trip.

Subsequent

?

1.

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

1 2.

Notify CONVEX, and Maintenance Department of problem.

3.

After problem has been corrected, reset targets and relays.

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 phese bus. This would need a special maintenance procedure and operating procedure.

h 8.2 N.S.S.T. Undervoltage C08 C1 -

Initiatina Device Set Point 27X-1 and 27X-1 15G-252 (6.9KV) < 70% of normal EG752

-- 27X-1 and 27X-1 15G-2S3 7 (4.16KV) < 70% of normal 1TG fS3 -

Action u Auto  ?, ,

1. i-;

Blocks closing of the following breakers: n.

2S3-24A-2, N.S.S.T. to Bus 24A

., ,g.;

253-24B-2, N.S.S.T. to Bus 24B Y 252-25A-2, N.S.S.T. to Bus 25A 2S2-25B-2, N.S.S.T. to Bus 258 ['[i.

Initial' Q,

1. si Verify proper operation of the turbine generator and its exciter. .

s 6

e-

. ,* i OP 23478 Page 8 Rev. S) 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 H.S.S.T. Trouble C08 D-1 _Initiatino Device Set Point N.S.S.T. Local Panel Common Alarm Light Action , ME

1. None. .

Initial

1. i Monitor main control board indication of voltage, current, KW, etc. , or other alarms to determine if a fault exists on the ,

N.S.S.T.

2. _

                     ' Monitor N.S.S.T. temperature and other parameters on the plant

) Data Logger. [' 3. I-Dispatch an operator to the N.S.S.T. local common alarm light panel to determine what the alarm is. Subsequent 2

                                                                                                       ~

1. Refer to Subsequent action under individual N.S.S.T. alarms. ~ 8.3.1 N.S.S.T. cooler Power Auto Transfer Local Panel Initiatino Device Set Point ' Transfer Device , Loss of selected power supply i Action  ::. Auto ' 2. k

 ,    ,;. 1.        Automatic transfer of power to the alternate source.                                N Initial                                                                                 g; w

1. W Reset local alarm to enable future N.S.S.T. alarms to e.

N. 2. annunciate main control board "N.S.S.T. Trouble". Check closed breakers 8C-2, 8C-3 on local panel. hh:

3. 9:

Check for blown fuses, FU-1, on local panel. e

** i OP 2347B       Page 9 Rev. 5

{) 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 determined, notify Maintenance Department. 8.3.2 N.S.S.T. High Combustible Gas Initiating Device Set Point Fault Gas Monitor 1% Action Auto i

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 Readina TCG Reading % ,

_ Course of Action 0 - 0.5 No Action ^ 0.5 - 1 Caution: Close surveillance for upward Trends 1 -5 Investigate cause imediately . 5 - y Remove transformer from

                                                                                              ;f service until cause is located and remedied                     r.

Subsequent ,

                                                                                        ,    wt

1. sr High fault, gas monitor reading could indicate an internal Y pg fault, notify CONVEX of indication.

2. Proceed as directed by CON /EX.  ;

8.3.3 E}j;j N.S.S.T. Hi-Lo Tank Pressure N$ Indicating Device Set Point e Pressure Sensor Hi 3.0 psig Pressure Sensor lo .25 psig l

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OP 2347B Page 10 Rev. 5  ! Q 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 gas regulator pressure, tank liquid level and winding temp.

3. Notify Control Room.

Subsequent

1. Hi Tank pressure could result froi.

Siled 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 i-N.S.S.T. Winding Temp (Y) Local Panel t, N.S.S.1. winding Temp (X) g Initiatina Device g Set Point

1. Oil Temp. Detector .h' 90*C

2. Winding Temp. Detectors $.,

105'C Action @

  --                                                                                                       M Auto                                                                                           g

1. None. E

                                                                                                           ?QL Initial                                                                                        tjf, 1.

Reset local alarm to enable future alarms to annunciate Main h Control Board "N.S.S.T. Trouble". ,% a 0 se

       .* - i OP 2347B        Page 11 Rev. 5 h                      2.      Check local temperature indicators.

3. Check cooling fans and oil pumps operating select "ha'nd" operation for cooling fans and oil pumps at local panel, if necessary. 4. Check closed cooling fan and oil pumps CKT Bkrs. at local panel ' 8C-4, 8C-5, 8C-6, 8C-7, and red handle breaker in the right side of the local panel.

                    . 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 I 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 1. Relieve overpressure condition in the tank. Initial g

1. .

Reset local alarm to enable future alams to annunciate Main ) Control Board "N.S.S.T. Trouble". e

2. ..

Observe which relief value has lifted, verify overpressure condition has been corrected and check that relief valve has reset. f

3. Notify Control Room.

Subsequent $

1. C Follow applicable portions of OP Procedure, Section 8.3.3.1 and R 8.3.3.2 initial and subsequent action as to causes and ',

g corrective action for tank overpressure. 8.3.6 N.S.S.T. Liquid Level p.i-Local Panel Initiating Device ['. I Set Point Liquid level gauge 3[. Low Mark n

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(. . *' '* OP 23478 Page 12 Rev. 5 ) Action. Auto

1. None Initial 1.

Reset local alarm to enable future alarms to annunciate Main ' Control Board "N.S.S.T. Trouble". 2. Check local level indications. 3. Checx N.S.S.T. for oil leaks. 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. i from service. 2. On a minor oil leak, notify CONVEX and closely observe oil level until corrective action has been taken. 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

1. None

_ Initial  :

1. .

Reset local alarm to enable future alarm to annunciate Main

• Control Board "N.S.S.T. Trouble".

2. Check oil pumps cperating. ,

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

4. Check oil pump overloads reset. g

                              ~

5. Check oil level. ly, Subsequent ,

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

2. Notify CONVEX. {

8.3.8 M N.S.S.T. Loss of Control Power Local Panel Initiatina Device hI set Point Control Power Undervoltage Less than 70% normal fb e 4

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                                                                                                  .~

OP 2347B Page 13 Rev. 5 } Action Auto 1. Loss of N.S.S.T. Cooling fans and oil pumps.

2. Loss of fault gas monitor.

3. Loss of local panel heaters, lights and convenience outlets. ' s Initial 1. Reset local alarm to enable future alarms to annunciate Ma:n Control Board "N.S.S.T. Trouble". 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 MCC22-1DA. Subsequent 1.

                   , 1f control power cannot be restored, notify CONVEX and 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 i _ Set Point Pressure Switch 63GC 200psig Action  : Auto .

1. None  :

Initial

1. ,

Reset local alarm 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. h Verify low pressure condition of the N2 gas cylinder.

_ Subsequent [

1. Notify Control Room of indications.

                                                                                       ,       h:

2. 3. Replace the spent N2 gas cylinder with a full one. h Check system for leaks.  ?[ 8.4 N.S.S.T. Degraded Voltage C04L CA-8 (Computer) Initiating Device A: set Point  % (COMMITMENT: IE INFO NOTICE 84-02) 6 Computer Print b^ 3620V EE032 Bus 24 A/B (4.16KV)

4 .; 00 2347B Page 14 Rev. 5 ] Action Auto I

1. None Initial

1. Verify proper operation of the turbine generator and its excitcv per Procedure OP 2324A.

2. Verify actual degraded voltage conditioa by observation of bus voltmeters.

Bus 24A, B, C, D, & F < 3620V Bus 22E & F < 424V

3. If possible reduce affected busses loads to increase voltage.

4. Call Convex to raise 24KV Generator Voltage / Increase VAR output.

5. Call Convex to raise system voltage.

6. Inform Duty Officer if Degraded Voltage persists.

NOTE: The short degradation voltage for safety related motors is 85% of rated voltage. The time limit at this voltage before permanent damage is approximately 4 hours. Subsequent 1. Determine cause of degraded voltage condition and log reason, action taken, and time period taken to restore normal voltage, RHB:dlp c F-t f, m . w}}