ML19330C381

Proposed Changes to Tech Specs 3.9 & 4.9 Re Limiting Conditions for Operation & Surveillance Requirements of Auxiliary Electrical Sys.Includes Justification for Proposed Tech Specs Changes

ML19330C381
Person / Time
Site:	Browns Ferry
Issue date:	08/06/1980
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19330C374	List: ML19330C373 ML19330C381
References
NUDOCS 8008080301
Download: ML19330C381 (20)

Text

9 e

e O

UNITS 1 AND 2 PROPOSED CliANGES i

1 l

9 8

- 800 8 0 8030l-

l LIMITI4C CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARY ELECTRICAL SYSTEM 4.9 -AUXILIARY ELECTRICAL SYSTEM Applicability' Applicability AppliesL to all the auxiliary elec-Applies to the periodic testing trical power system.

requirements of the auxiliary electrical systems.

Objective Objective To assure an adequate supply of

. electrical power for operation of Verify the operability of the those systems required for safety.

auxiliary electrical system.

. Specification Specification A.

Auxiliary Electrical Equipment A.

Auxiliary Electrical Equipment A reactor shall not be started 1.

Diesel Generators up (made critical) from the

- cold. condition unless four a.

Each diesel generator units 1 and 2 diesel generators shall be manually started are operable, both 161-kV trans-and loaded once each month mission lines, two common sta-to demonstrate operational tion service transformers readiness. The test shall continue for at least a and the require-one-hour period at 75% of ments of 3.9.A.4 through rated load or greater.

3.9.A.7 are met.

During.the monthly gene-A reactor shall not be started rator test the diesel'-

up (made critical) from the generator starting air Hot Standby Condition unless compressor shall be all of the following condi-checked for operation and

' ts ability to recharge tions are' satisfied:

i air receiverv. The opera-

'l.

At least.one off-site 161-kV tion of the diesel fuel transmission line and its.

oil transfer pumps shall common transformer are be demonstrated, and the available ano capable of diesel starting time to automatically supplying reach rated voltage and' auxiliary power to the speed shall be logged.

shutdown boards.

b.

Once per operating cycle 2.

Three units 1 and.2 diesel a test will be conducted

, generators shall'be operable..

to demonstrate the emer-gency diesel generators 3.

An additional source of will start and accept power consisting.of one of emergency load within the'following:

ta. _A second 161-kV trans-mission line and its

.292

i LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A Auxiliary Electrical ~ Equipment 4.9.A Auxiliary Electrical Equipment common transformer and the specified time sequence.

cooling tower trans-former capable of sup-c.

Once a month the quantity plying power to the of diesel fuel available shutdown boards.

shall be logged.

b.

A fourth operable units d.

Each diesel generator 1 and 2 diesel generator.

shall be given an annual inspection in accordance 4.

Buses and Boards Available with instructions based on the manufacturer's a.

Start buses lA and 1B recommendations, are energized.

e.

Once a month a sample of b.

The units 1 and 2 4-kV diesel fuel shall be shutdown boards are checked for quality. The energized.

quality shall be within acceptable limits c.

The 480-kV shutdown specified in Table 1 boards associated with of the latest revision the unit are energized.

to ASTM D975 and logged.

2.

D. C Power System - Unit d.

The Units 1 & 2 Diesel Batteries (250-Volt) Diesel Aux Boards are energized Generator Batteries (125-Volt) and Shutdown Board Batteries i

e.

Undervoltage rel.,ys (250-Volt) operable on start buses lA and 1B and 4-kV shut-a.

Every week the specific down boards, A, B, C, gravity and the voltage of and D.

the pilot cell, and

, temperature of an adjacent f.

Shutdown Busses 1 & 2 cell and overall battery energizedi voltage shall be measured and logged.

5.

The 250-Volt unit and shut-down board batteries and a battery charger for each b.

Every three months the battery boards are operable.

measurements shall be made of voltage of each 6.

Logic Systems cell to nearest 0.1 volt3 specific gravity of each a.

Common accident signal cell, and temperature of logic system is operable.

every fifth cell. These measurements shall be b.

480-V load shedding logic

logged, system is operable.

c.

A battery ratad discharge

7. :There shall be a minimum of (capacity) test shall be 103,300 gallons of diesel performed.and the volt'ge, a

fuel in the standby diesel time, and output current generatorfuel; tanks.

measurements shall be logged at intervals not 293 to exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

~

LIMITING CONDITIONS FOR~ OPERATION SURVEILLANCE REQUIREMENTS 13.9.B: JOperation with' Inoperable 4.9.B Operation with-Inoperable Equipment Equipment I

Whenever a reactor is in Startup'.

mode or Run mode and not in a cold condition,'the availability of

. electric power shall be as specifi-Led in 3.9.A, except as specified

.herein.

1.

From and after the date that 1.

When one 161-kV line or one common one 161-kV line or one common station transformer or one start 1

station transformer.or one start bus is.found to be inoperable, all I

-bus becomes inoperable, ' reactor units 1 and 2 diesel generators operation is permissible under and associated boards must be this condition for!seven days.

demonstrated to be operable

.2.

From and-after the date that the 4kV bus-tie board becomes 2.

When the 4kV bus tie board is

. inoperable, reactor operation inoperable both common station is permissible for 30 days service transformers shall be provided both common station-shown to be energized daily.

service transformers are energized.

3.

When one of the units 1 and 2 3.

When one of the units 1 and 2 diesel diesel generator is inoperable, generator is found to be inoperable, continued reactor operation all of the CS, RHR (LPCI and Contain-is permissible during the ment Cooling) Systems and.'the succeeding 7 days provided that remaining die--1' generators and both offsite 161-kV trans-associated boards shall be demon-mission lines and both common strated to be operable immediately station transformers cne one and daily thereafter.

common transformer-and one 4-

-cooling tower transformer (not parallel with the ener-

.gized common transformer) and

-bus tie board and available, and all-of the CS, RHR (LPCI and Containment Cooling)

Systems, and the remaining three-units 1 and 2 diesel generators are operable.

i 295

' LIMITING CONDITIONS'FOR OPERATION SURVEILLANCE REOUIREMENTS 13.9.B -Operation with Inoperable 4.9.B Operation with Inoperable

' Equipment' Equipment 4.

When-one units 1 and 2 4-kV

4. When one 4-kV shutdown board shutdown board is inopesable,'-

is found to be inoperable, all 1

continued reactor operation remaining 4-kV' shutdown boards is permissible for a period and associated diesel genera-

~

not to exceed 5 days, provided tors, CS and RHR (LPCI and that both off-site 161-kV Containment Cooling) Systems transmission lines and both supplies by the remaining 4-kV common station transformers shutdown boards shall be demon-or one-common. transformer and strated to be operable, imme-one cooling tower transformer diately and daily thereafter, and 4-kV bus tie board are available and'the remaining

5. When one shutdown bus is found 4-kV shutdown boards and to be inoperable all 1 & 2 diesel associated diesel generators, generators shall be proven operable CS, RHR (LPCI and Containment immediately and daily thereafter.

Cooling). Systems, and all 480 V emergency power boards are operable.

5. When one of the shutdown busses is inoperable reactor operation is permissible for a period

-of 7 days.

6.'When one of the 480V diesel Aux.-boards becomes inoperable reactor! operation is per-missible for a period of 5 days

7. From and after the date that one of the three 250-Volt unit batteries and/or its' associated battery board is found to be inoperable for any' reason, continued reactor operation is permissible during the succeeding

'sevenLdays. Except for routine surveillance testing the.NRC-shall be notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the situation, the precautions to be taken-during this period and the plans to' return the failed component to an operable state.

8.!From and after the date that one of the four 250-volt-shutdown 296 s

e i

[.

H. i_

a.1

.er

^'

m e

5:I E LIMITING CONDITIONS FOR' OPERATION

- SURVEILLANCE' REQUIREMENTS-c329.B jOperation with Inoperable-4.9.B iOperation with Inoperable

Equipment:

f;

> Equipment

~

t board batteries'and/or~its.

16. ' When one units 1 & 2 diesel-

associated battery-board'is'-

Aux board is found to be found to be inoperable for

. inoperable the.remainingidiesel any reason,l continued reactor Aux board and each unit 1 & 2-

~

-operation is' permissible

diesel generator shall be proven-during=the' succeeding five.

operable immediately and' daily

days inLaccordance

with thereafter.,

V-

'l 13.9.B.7.

I-9.-;WhenoneidivisionoftheLogic

System is-inoperable, continued

, reactor operation is permis-sible under chis-condition-for seven' days.provided the'CSCS

. requirements list _ed'in specifi-

'l cation 3.9.B.3 are satisfied.

~

the NRC'shall be notified

within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of.,the situa-Ltion, the precautions to be taken during-this period and the!. plans ltoireturn the failed-component to an crer-able state.

i

'10. JUndervoltage relays on lA or-1B

' start bus may be inoperable -

~for a period of 7.' days provided the other start bus and smder-

. voltage relay'are operable

-(withinLsurveillance schedule of. 4'.9. A.4a).

"11.JUndervoltage relays on'a

-' shutdown' board-may be inoperabl e

5Jdays provided the other eshutdown boar'ds~andLundervoltag e

_ relays:are operable'.(within

-survcillance schedule'of

'4.9.A.4.b) 12'. :- When one '480 ' volt shutdown board.

<is found::to be inoperable the

~

reactor will be placed in hot

. standby.within-12 hoursiand' l cold ~ shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.-

~

013.-lIf$the:requ'irement's:foroperating Ein the conditions'specifled.by.

gi 3;9.B.1;through?3.9.B12 cannot qbe lmeti,-- an orderly, s' hutdown shall

~

'.be; initiated and the reactor shall--

'{}

}be shutdown andOih'the cold Leondition within-24 hours. -

297-y.

pt.

LIMITIN_p' CONDITIONS FOR OPERATION KHRVRTf_fjtNcF RFOHTRFMENTR 3.9.C Operation in cold shutdown i Whenever both reactors are'~in cold shutdown condition with irradiated fuel in either reactor, the avail-ability of electric power shall be as specified in section 3.9.'A except as specified herein.

1.

At least two units 1 and 2 diesel generators _and-their associated 4-kV shutdown boards shall be operable.

2.

An additional source of power consisting of at least one of the following:

a.

One 161-kV transmission line and its associated common station transformer or either-cooling tower transformer and a 4-kv bus tie board capable of supplying power to the Units 1 and 2 shut-down boards.

b.

A third operable diesel generator.

3.

At least one 480-V-shutdown board for each unit must be

. operable.

i i

238 4

2

,c

.y g.-

s:

3'.9 BASES ^

The objective of this specification is to assure an adequate source of electrical power to operate facilities to cool the plant during shut-down and~to operate the engineered safeguards following an accident.

There are three sources of alternating current electrical energy available, namely, the 161-kV transmission system, the nuclear genera-ting units, and the' diesel' generators.

The 161-kV offsite power supply consists of two lines which are fed from

~

different sections of the TVA 161-kV grid. In the normal mode of opera-

. tion, the 161-kV system is operating and four diesel generators are opera-tional. If one diesel generator is out of service, there normally remain the 161-kV sources, the nuclear generating units, and the other three diesel generators. For a-diesel generator to be considered operable its associated 125 V battery must be operable.

The minimum fuel oil requirement of 103,300 gallons is sufficient for 7 days of full load operation of 3 diesels and is conservatively based on availability of a replenishment supply.

Auxiliary power for Browns Ferry Nuclear Plant is supplied from two sources; either the unit station transformers or from the'161-kV transmission system through the common station transformers or the cooling tower transformers.

If a common station transformer is lost, the units can continue to operate since the unit station transformers are in service, the other common station transformer and the cooling tower transformers are available, and four diesel generators are operational.

If a common station service transformer is out of service the shutdown busses can be fed through a cooling tower transformer and bus tie board. Both cooling tower transformers or 4kV bus tie board may remain out of service for 30 days as long as both common transformers are in service. This is allowed due to the standby service required of the cooling tower transformers and bus tie board and the high reliability of the offsite power circuits.

The shutdown busses distribute power to the shutdown boards and allow for flexibility of access to the offsite circuits. A 480V diesel Aux-board is allowed to be out of service for short periods of time for tests and maintenance.

A 4-kV shutdown board is allowed to be out of operation for a brief period to allow for maintenance and testing, providing all remaining 4-kV shutdown 1 boards and associated diesel generators CS, RHR, (LPCI and Containment Cooling) Systems supplied by the remaining 4-kV shutdown boards, and all emergency-480 V power boards are operable.

There are eight 250-volt d-c battery systems each of which consists of a battery, battery charger, and distribution equipment. Three of these sys-

.tems provide power for unit control-functions, operative power for unit motor loads,_and. alternative drive power for a 115-volt a-c unit preferred motor-generator. set.' l One 250-volt d-c system provides power for coc=on plant and transmission system control functions, drive power for a 115-volt a-c ' plant preferred motor-generator set, and emergency drive power for certain unit large motor loads. The four remaining systems deliver con-trol power to the~4160-volt shutdown boards, f

299

p. --

j;..

a, 0

9 4

k I,

h, UNIT 3 PROPOSED CHANGES U

,8 1

e I

]

l

LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9-AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARY ELECTRICAL SYSTEM..

b.

The fourth operable unit 3 diesel 4

generator.

4.

Buses and Boards 4.

Undervoltage Relays Available a.

Once every 6 a.

Both start buses to-unit 3 are energized.

months, the condition under

'(

which the undervoltage b..

The 4-kV bus tie board and relays are shutdown boards required shall be simulated (3EA, 3 EB, 3EC, with an 3ED) are energized, undervoltage on start buses 1A and 1B to c.

The 480-V demonstrate that shutdown boards the diesel associated with the unit are generators will start.

energized.

b.

Once every 6 d.

Undervoltage months, the relays operable conditions under on start buses k

which the 1A or la and 4-kV shutdown undervoltage relays are boards, 3EA, required shall 3EB, 3EC, and be simulated 3ED.

With an undervoltage on

.e.

The 480V diesel each shutdown Act Boards are board to energized, demonstrate that the associated diesel generator will start.

320 I-t l

l m

i i

s aLIMITING CONDITIONS FOR.0PERATION-SURVEILLANCE REQUIREMENTS

-l

3.91 AUXILIARY

ELECTRICAL SYSTEM

~4.9 AUXILIARY ELECTRICAL SYSTEM-a 2.= When one unit 3 diesel

-2. ' When one unit 3

' generator'(3A,.3B,.3C,.

diesel' generator is or ; 3D) '. is. inoperable, found to be continued reactor-

-inoperable, all of

-operation.is permissible _

the.CS, RHR (LPCI and during the succeeding 7.

Containment Cooling)

days, provided that both Systems,and the

.offsite 161-kV trans--

remaining unit 3 mission. lines, and both.

diesel. generators and cooling tower trans-associated boards

- formers are available-shall~be demonstrated and capable of supply-to be' operable.-

-ing power to the' Unit 3

'immediately and daily shutdown boards, and thereafter.

l all of.the CS, RHR (LPCI and Containment Cool-ing_ Systems, and the regaining three unit 3 diesel generators are operable.-

benthe4kVbustieora 3.

When the 4kV bus tie or 3.

unit 3 start. bus is a unit 3 start bus is inoperable or not capable found to be ' inoperable all 1

of.being supplied from the unit 3 diesel generators cooling tower transformers

'and associated boards shall operation is permissible be demonstrated operable

~

-for 7 days provided that immediately and daily both-161-kV lines and both-thereafter. The cooling cooling' tower transformers-tower transformers and start and the unit 3 diesel' busses shall be shown to be.

generators are operable.

energized daily.

4

~

323 9:

4

. LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARY ELECTRICAL SYSTEM 4.

When one unit 3 4-kV 4.

When one unit 3 4-kV shutdown board is shutdown board is inoperable, continued found to be reactor operation is inoperable, all permissible for a remaining unit 3 4-kV period not to exceed shutdown boards and 5 days, provided that associated diesel both offsite.161-kV generators,'CS and transmission lines-RHR (LPCI and and both cooling tower Containment Cooling) transformers are Systems supplied by available and the the remaining 4-kV remaining unit 3 4-kV shutdown boards shall shutdown boards and be demonstrated to be associated diesel operable, immediately generators, CS, RHR and daily thereafter.

(LPCI and Containment Cooling) Systems, and all unit 3 480-V emergency power boards are operable.

If this requirement cannot be met, an orderly shutdown shall be initiated and the reactor shall be shutdown and in the cold condition within e

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

5. 'From and after the date 5.

When one 480 Volt diesel that one of the 480 volt auxiliary board is found diesel Aux boards inoperable, the remaining becomes inoperable, diesel auxiliary board and reactor operation is each unit 3 diesel shall permissible"for a period be verified operable immediately of 5 days.

and daily thereafter.

O e

324 4

t

~: 5 +A s

. LIMITINC CONDITIONS FOR OPERATION'

~ SURVEILLANCE REQUIREMENTS' 3.9' AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARY ELECTRICAL SYSTEM 6.

From and after.

the date that the.

250-Volt' Shutdown board batteries'or-one of the three

+

~ batteries and/or its 250-Volt unit t

associated battery.

' board is found to be inoperable for any'

~ reason,: continued reactor operation is i-

. permissible during-i the succeeding-seven

days. -Except for routine. surveillance ytesting, the NRC-shall be notified within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of.

[

the situation..the precautions to be

taken during'this.

period and the plans to return'the failed component,tc an li operable state.

7. - When one division of-

-the Logic-System is inoperable, continued reactor operation is-permissible under; this condition for seven days,;provided the CSCS requirements.

listed in Specification-3.9.B.2.,

are satisfied. -The~

1NRC shall be: notified-

-c 1

within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of i

.the situation..the precautions to be{

--taken during this

}'

period andLthe plans to return-the. failed component to an-operable' state.

s 325 s

bs

-v,-

i st

,--w.-

w-.n--,,,

y

-w-

=.

LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARY ELECTRICAL' SYSTEM 8.

Undervoltage relays on lA or 1B start bus may be inoperable for a period of 7 days provided the other start bus and undervoltage relay are operable (within sur-veillance schedule or 4.9.A.4.a).

9. 'Undervoltage relays on a shutdown board may be inoperable 5 days provided the other shutdown boards'and undervoltage relays are operable (within' surveillance schedule of 4.9.A.4.b).

10.

When one 480 volt shutdown board is found to be inoperable, the reactor will be placed in hot standby within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

11.

If the requirements for operating in the conditions specified by 3.9.B.1 through 3.9.B.12 cannot be met, an orderly shutdown shall be initiated and the reactor shall be shutdown and in the cold con-dition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

9 9

h 4

325a 1

l e

'3.9 BASES The objective of this specification is to assure an adequate

- source of ~ electrical power to operate facilities to cool the unit during shutdown and to_ operate the engineered safeguards following an accident.. There are-three sources of alternating current electrical energy.available, namely, the 161-kV transmission system, the nuclear _ generating units, and the diesel generators.

(.

The 161-kV offsite power supply consists of two lines which are fed from different' sections of the'TVA 161-kV grid.

In the normal mode of operation,4the 161-kV system is operating and four diesel generators are operational.. If one diesel generator is out offservice, there normally; remain the 161-kV sources, and the other three diesel generators.; For a diesel ger.erator to be considered _ operable its associated 125 V battery must be operable.

The minimum fuel oil requirement.of 103,300 gallons is sufficient for ;7: days of full load operation of 3 diesels and is

. conservatively based on availability of a replenishment supply.

l E0ffsite auxiliary power for Browns Ferry Nuclear Plant Unit 3 is supplied from two sources: the unit station transformers from the main generator or the 161-kV transmission system through the cooling ~ tower transformers. If a cooling tower transformer is lost, the unit can continue to operate since the station transformer is in service, the other. cooling tower transformer is available,

and four diesel generators are operational.

The'4-kV bus tie board provides the shutdown boards with backup access to the offsite power system through either cooling tower transformer.

A 4-kV shutdown board is allowed to be out of operation for a brief period to allow for maintenance and testing, providing all remaining 4-kV shutdown boards and associated diesel generators CS, RHR, (LPCI and' Con'tainment Cooling)' Systems supplied by the remaining 4-kV. shutdown boards, and all emergency 480 V power boards are operable.

The 480V diesel' Aux board may be out of service for short periods for tests and maintenance.

There are. five '250-Volt d-c battery systems each of which consists'of a battery,' battery charger, and distribution equipment. 'Three of these systems provide power for unit control functions, operative power.for vnit motor loads, and alternative

~

drive - power, for a 115-volt 'a-c unit-preferred motor-gener ator set. J0ne 250-Volt d-c system provides power-for common plant and transmission system. control functions, drive power for a ll5-Volt

a-c plant preferred motor-generator set, and _ emergency drive power :for certain unit _ large motor loads. The fifth battery system

-delivers' control power:to a 4-kV shutdown board, o

'327

+

A'

~ ~,

e

. ~. -, -

,,n..

. ~.,.,..

,,.,a-in.+c

.-,,-a.c,c

~~-n s,.-,

r r

,~, -

1 n

The.250-Volt d-c system is so arranged, and the batteries sized such, that 2

- the loss of any one unit battery will not prevent the safe shutdown and cooldown of all three units in the event of the loss of offsite power and a design basis accident in any one unit. Loss of control power to any engineered safeguard control circuit is annunciated in the main control room of the unit affected.

' The station battery supplies loads that are not essential for safe shutdown and cooldown of the nuclear system. This battery was not considered in.the accident' load calculations.

d e

J 1

l l

'328 l.

Y

1 t

ENCLOSURE 2 h

JUSTIFICATION r

9 5

I I

9-h a

f o

\\

i l

I-

[ ' :.

.u

~.

c A

i BROWNS FERRY NUCLEAR FLANT j

PROPOSED APPENDIX-A TECHNICAL SPECIFICATION CHANGES

-(TVA BFNP TS 141) i Description of Change

~'

l t. - Delete requirement-for cooling tower transformers.

2.

Add conditions for the shutdown busses and. diesel auxiliary boards to be

-energized.

3.

Specify 'a limit for operation with the bus tie board out of service.

4.

Specify a limit for operation with a 4-kV shutdown bus out of service.

5.

Specify a limit -for operation with a 480-volt diesel auxiliary board ent of service.

6.

Specify_a limit for' operation with-a 480-volt shutdown board out of service.

7.. Specify a limit for operation with undervoltage relays on a 4-kV start bus out of service.

. 8.

_Specify a limit for operation with undervoltage relays on a 4-kV shutdown board out of service.

Reason for Change

-1.

The cooling tower transformers are not needed for unit opera' tion except in degraded-conditions.

12.

Shutdown-busses and diesel-auxiliary boards are necessary for operation of the onsite and offsite power system.

3.

The bus tie board is needed in the event a common transformer is removed from service.

4.

Specifics a time limit that a 4-kV shutdown bus can be removed from

service for maintenance ~and testing.

5.

_ Specifies' a. time limit that a 480-volt diesel auxiliary board can be removed from service 'for maintenance and testing.

6. ~ Spec'ifies a time limit that a 480-vcit shutdown board can be removed from service for maintenance and testing.

7.

Specifies a time. limit that undervoltage relays on a 4-kV start bus can-be. removed from service for maintenance and testing.

8.

Spec'ifies a time limit that undervoltage relays on a 4-kV shutdown

" board 'can be removed froy service for' maintenance and testing.

1

/

.. ~..

c.g.-

-a W

4 2

1-

.The proposed)c.hanges are intended to. resolve-ambiguities which exist

'in the:anxiliary electrical system technical specifications. A.brief-

- description'and. reason 'for each; proposed change. is attached.

A 1.

I-i.-

ii i

d a

1

+

{. l~

e'-

j.

> ^

o l' -

n i

'g.

5 o

_..,