Text

Proposed Tech Specs Re Auxiliary Electrical Sys,Auxiliary Electrical Equipment & Availability of Diesel Fuel Oil
	ML18033B167
Person / Time
Site:	Browns Ferry
Issue date:	01/31/1990
From:	; TENNESSEE VALLEY AUTHORITY
To:	;
Shared Package
ML18033B165	List: ML18033B164; ML18033B167;
References
	NUDOCS 9002130129
	Download: ML18033B167 (28)
	v • d • e

Enclosure l Proposed Technical Specification Browns Ferry Nuclear Plant Units l, 2, and 3

(TVA BFN TS 277) 9002130129 900131 PDR ADOCK 05000259 P

PDC

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AUXILIARYELECTRICAL SYSTEM C

LIMITING CONDITIONS FOR OPERATION 3.9 uxi ia Electrica S stem SURVEILLANCE REQUIREMENTS 4.9 Auxi iar Electrical S stem A licabi it A licabilit Applies to all the auxiliary electrical power system.

Applies to the periodic testing requirements of the auxiliary electrical system.

~Ob ective

~Ob 'ective To assure an adequate supply of electrical power for operation of those systems required for safety.

Verify'the operability of the auxiliary electrical system.

S ecification A.

Auxiliar Electrical E ui ment A.

Auxilia Electrical S stem 1.

Prior to startup from a COLD CONDITION, the follow-ing must be satisfied:

a.

Diesel generators A,

B, C, and D OPERABLE.

b.

Requirements 3.9.A.3 through 3.9.Ae6 are met.

c.

At least two of the following offsite power sources are available:

(1) The 500-kV system is available to the units 1 and 2 shut-down boards through the unit 1 station-service transformer TUSS/1B with no credit taken for the two 500-kV Trinity lines. If the unit/2 station-service transformer is the second

choice, a minimum of two 500-kV lines must be available.

1.

Diesel Generators a.

Each diesel generator shall be manually started and loaded to demonstrate operational readiness in accordance with the frequency specified in Table 4.9.A on a staggered test basis.

The test shall continue for at least a one hour period at 100% or greater of the continuous rating of the diesel gener-ator and the operation of the diesel fuel oil trans-fer pumps shall be demon-strated.

Also, the diesel generator starting air compressor shall be checked for operation and its ability to recharge air receivers.

Once per 18 months, each diesel generator will be tested at a load of at least 2800 KW to demon-strate full load carrying capability for an interval of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3.9/4.9-1 BFN Unit 1

I 4

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AUXILIARYEL CAL SYSTEM

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LIMITING CONDITIONS FOR OPERATION 3.9.A.

Auxilia Electrica E ui ment SURVEILLANCE REQUIREMENTS 4.9.A.

Auxiliar Electr cal S ste 3.9.A.l.c.

(Cont'd) 4.9.A.l. (Cont'd)

The diesel generator fast starts (10 seconds) from standby conditions shall be performed once per 184 days in these surveillance tests.

All other engine starts for the purpose of this test may be preceeded by an engine idle start.

Additional reporting requirements due to failures are noted in Table 4.9.A.

All diesel generator starts shall be logged.

(2) The Trinity 161-kV line is available to the unit 3 shutdown boards through a common station-service or cooling tower transformer.

NOTE FOR (2):

If units 1 and 2 are both in operation and claiming the Trinity line as an offsite

source, TUSS 3B must be claimed as the other offsite source for unit 3.

(3) The Athens 161-kV line is available to unit 3 shutdown shutdown boards through a common station-service or cooling tower transformer.

NOTE FOR (3):

If either unit 1 or unit 2 is claiming the Athens line as an offsite source, it may not be claimed as an offsite source

" for unit 3.,

b.

Once per operating

cycle, a test will be conducted simulating a loss of offsite power and similar conditions that would exist with the presence of an actual safety-injection signal to demonstrate the following:

(1) Deenergization of the emergency buses and load shedding from the emergency buses.

(2) The diesel starts from ambient condition on the auto-start signal, energizes the emer-gency buses with per-manently connected

loads, energizes the auto-connected emer-gency loads through load sequencing, and operates for greater than or equal to five miutes while its gen-erator is loaded with the emergency loads.

3.9/4.9-2 BFN Unit 1

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AUXILIARYELECTRICAL SYSTEM CO L'IMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.

Auxilia Electrical E ui ment 4.9.A.

Auxiliar E ectrical S stem 3.9.A.l.c.

(Cont'd) 4.9.A.l.b (Cont'd)

(4) The Athens 161-kV line is available to the units 1

and 2 shutdown boards through a common station-service transformer when unit 1 is in Cold Shutdown and unit 3 is not claiming the Athens line as an offsite source.

NOTE FOR (3)

AND (4):

With no cooling tower pumps or fans running, a cooling tower transformer may be substituted for a common station-service transformer.

(3)

On diesel generator breaker trip, the loads are shed from the emergency buses and the diesel output breaker recloses on the autostart signal, the emergency buses are energized with permanently connected

loads, the autoconnected emergency loads are energized through load sequencing, and the diesel operates for greater than or equal to five minutes while its generator is loaded with the emergency loads.

c ~

Once a month the quantity of diesel fuel available shall be logged.

d.

Each diesel generator shall be given an annual inspection in accordance with instructions based on the manufacturer's recommendations.

e.

Quarterly the quality of each diesel generator's (A, B, C, and D) seven day fuel supply shall be checked.

The fuel oil quality shall be within the acceptable limits specified in table 1 of ASTM-D975.

3.9/4.9-3 BFN Unit 1

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4 AUX LIARY ELECTRICAL SYSTE LIMITING CONDITIONS FOR OPERATION 3.9.A.

Auxil a Electrical E ui ment SURVEILLANCE REQUIREMENTS 4.9.A.

Auxilia Electrical S stem 4.9.A.4. (Cont'd) c.

The loss of voltage and degraded voltage relays which start the diesel generators from the 4-kV shutdown boards shall be calibrated annually for trip and reset and the measurements logged.

These relays shall be calibrated as specified in Table 4.9.A.4.c.

d.

4-kV shutdown board voltages shall be recorded once every 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

5.

Logic Systems a.

Common accident signal logic system is OPERABLE.

5.

480-V RMOV Boards 1D and 1E a.

Once per operating cycle the automatic transfer feature for 480-V RMOV boards 1D and 1E shall be functionally tested to verify auto-transfer capability.

b.

480-V load shedding logic system is OPERABLE.

6.

There shall be a minimum of 35,280 gallons of diesel fuel in each of the 7-day diesel-generator fuel tank assemblies.

3.9/4.9-7 BFN Unit 1

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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 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 500-kV transmission

system, and the diesel generators.

The unit station-service transformer B for unit 1 or the unit station-service transformer B for unit 2 provide noninterruptible sources of offsite power from the 500-kV transmission system to the units 1 and 2 shutdown boards.

Auxiliary power can also be supplied from the 161-kV transmission system through the common station-service transformers or through the cooling tower transformers by way of the bus tie board.

The 4-kV bus tie board may remain out of service indefinitely provided one of the required offsite power sources is not supplied from the 161-kV system through the bus tie board.

The minimum fuel oil requirement of 35,280 gallons for each diesel generator fuel tank assembly is sufficient for seven days of full load operation of each diesel and is -conservatively based on availability of a replenishment supply.

Each diesel generator has its own independent 7-day fuel oil storage tank assembly.

The degraded voltage sensing relays provide a start signal to the diesel generators in the event that a deteriorated voltage condition exists on a 4-kV shutdown board.

This starting signal is independent of the starting signal generated by the complete loss of voltage relays and will continue to function and start the diesel generators on complete loss of voltage should the loss of voltage relays become inoperable.

The 15-day inoperable time limit specified when one of the three phase-to-phase degraded voltage relays is inoperable is justified based on the two-out-of-three permissive logic scheme provided with these relays.

A 4-kV shutdown board is allowed to be out of operation for a brief period to allow for maintenance and testing, provided all remaining 4-kV shutdown 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-V dc 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 unit motor loads, and alternative drive power for a 115-V ac unit-preferred mg set.

One 250-V dc system provides power for common plant and transmission system control functions, drive power for a 115-V ac plant-preferred mg set, and emergency drive power for certain unit large motor loads.

The four remaining systems deliver control power to the 4,160-V shutdown boards.

3.9/4.9-19 BFN Unit 1

4 9

BASES

<0 The monthly test of the diesel generators is primarily to check for failures and deterioration in the system since last use.

The diesels will be loaded to at least 100 percent of its continuous rating (i.e., g 2600 KW) while engine and generator temperatures are stabilized (about one hour).

A minimum 75-percent load will prevent soot formation in the cylinders and injection nozzles.

Operation up to an equilibrium temperature ensures that there is no overheating problem.

The tests also provide an engine and generator operating history to be compared with subsequent engine-generator test data to identify and to correct any mechanical or electrical deficiency before it can result in a system failure.

Diesel testing once per 18 months (i.e., at least once per fuel cycle) at a minimum load of 2800 KW for an interval of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , assures that each diesel generator will be capable of supplying the maximum load during the first 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months of a loss of offsite power/loss of coolant accident.

This test also demonstrates each diesel generator's long-term load carrying capability.

The test during refueling outages is more comprehensive, including procedures that are most effectively conducted at that time.

These include automatic actuation and functional capability tests to verify that the generators can start and be ready to assume load in 10 seconds.

The annual inspection will detect any signs of wear long before failure.

BFN tests the 7-day diesel generator fuel oil supplies in accordance with Table 1 of ASTM-D975-81.

Each fuel oil supply is tested quarterly.

Battery maintenance with regard to the floating charge, equalizing

charge, and electrolyte level will be based on the manufacturer's instruction and sound maintenance practices.

In addition, written records will be maintained of the battery performance.

The plant batteries will deteriorate with time but precipitous failure is unlikely.

The type of surveillance called for in this specification is that, which has been demonstrated through experience to provide an indication of a cell becoming irregular or unserviceable long before it becomes a failure.

The equalizing charge, as recommended by the manufacturer, is vital to maintaining the ampere-hour capacity of the battery, and will be applied as recommended.

The testing of the logic systems will verify the ability of the logic systems to bring the auxiliary electrical system to running standby readiness with the presence of an accident signal from any reactor or an undervoltage signal on the 4-kV shutdown boards.

The periodic simulation of accident signals in conjunction with diesel-generator voltage available signals will confirm the ability of the 480-V load shedding logic system to sequentially shed and restart 480-V loads if an accident signal were present and diesel-generator voltage was the only source of electrical power.

3.9/4.9/21 BFN Unit 1

t3 4

AUXILIAR EL -

. CAL SYSTEM

("

LIMITING CONDITIONS FOR OPERATION 3.9 AUXILIARYELEC RICAL SYSTEM SURVEILLANCE REQUIREMENTS 4.9 AUXILIARYELECTRICAL SYSTEM A licabilit A licabilit Applies to all the auxiliary electrical power system.

Applies to the periodic testing requirements of the auxiliary electrical system.

~Dh 'ective Ob ective To assure an adequate supply of electrical power for operation of those systems required for safety.

Verify the operability of the auxiliary electrical system.

S ecification S ecification A.

Auxiliar Electrical E ui ment 1.

Prior to startup from a COLD CONDITION, the follow-ing must be satisfied:

A.

Auxilia Electrical S stem 1.

Diesel Generators a.

Diesel generators A,

B, C, and D OPERABLE.

b.

Requirements 3.9.A.3 through 3.9.Ae6 are met.

c.

At least two of the following offsite power sources are available:

(1) The 500-kV system is available to the units 1 and 2 shut-down boards through the unit 1 station-service transformer TUSS 1B with no credit taken for the two 500-kV Trinity lines. If the unit 2 station-service transformer is the second

source, a minimum of two 500-kV lines must be available.

a ~

Each diesel generator shall be manually started and loaded to demonstrate opera-tional readiness in accord-ance with the frequency specified in Table 4.9.A on a staggered test basis.

The test shall continue for at least a one hour period at 100% or greater of the con-tinuous rating of the diesel generator and the operation of the diesel fuel oil transfer pumps shall be demonstrated.

Also the diesel generator starting air compressor shall be checked for operations and its ability to recharge air receivers.

Once per 18 months, each diesel generator will be tested at a load of at least 2800 KM to demonstrate full load carrying capability for an interval of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3.9/4.9-1 BFN Unit 2

4 AUXILIARYEL

. ICAL SYSTEM CO LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A. Auxilia E ect ca E u ment 4.9.A. Auxilia E ectrical S stem 3.9.A.l.c. (Cont'd) 4.9.A.l. (Cont'd)

The diesel generator fast starts (10 seconds) from standby conditions shall be performed once per 184 days in these surveillance tests.

All other engine starts for the purpose of this test may be preceeded by an engine idle start.

Additional reporting requirements due to failures

,noted in Table 4.9.A.

All diesel generator starts shall be logged.

(2) The 500-kV,system is avail-able to the units 1 and 2 shutdown boards through the unit 2 station-service transformer TUSS 28 with no credit taken for the two 500-kV Trinity lines.

If the unit 1 station-service transformer is the second

choice, a minimum of two 500-kV lines must be available..

b.

Once per operating cycle, a

test will be conducted simu-lating a loss of offsite power and similar conditions that would exist with the presence of an actual safety-injection signal to demonstrate the following:

(1) Deenergization of the emergency buses and load shedding from the emer-gency buses.

(3) The Trinity 161-kV line is available to the units 1

and 2 shutdown boards through both common station-service transformers.

NOTES FOR (3):

(a) If unit 3 is claiming the Trinity line as an offsite source, see unit 3 technical specifications, section 3.9.A.l.c.2.

(2) The diesel starts from ambient condition on the auto-start signal, ener-gizes the emergency with permanently connected

loads, ener-gizes the auto-connected emergency loads through load sequencing, and operates for greater than or equal to five minutes while its gener-ator is loaded with the the emergency loads.

(b) If unit 1 is in cold

shutdown, only one common station-service transmformer is required.

3.9/4.9-2 Unit 2 BFN

CO 4

AUXILIAR ELECTRICAL SYSTEM

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LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.

Auxilia Electrical E ui ment 4.9.A.

Auxil a Electrical S stem 3.9.A.l.c.

(Cont'd)

(4) The Athens 161-kV line is available to the units 1

and 2 shutdown boards through a common station-service transformer when unit 1 is in Cold Shutdown and unit 3 is not claiming the Athens line as an offsite source.

NOTE FOR (3)

AND (4):

With no cooling tower pumps or fans running, a cooling tower transformer may be substituted for a common station-service transformer.

4.9.A.l.b (Cont'd)

(3)

On diesel generator breaker trip, the loads are shed from the emergency buses and the diesel output breaker recloses on the autostart signal, the emergency buses are energized with permanently connected

loads, the autoconnected emer-gency loads are energized through load sequencing, and the diesel operates for greater than or equal to five minutes while its generator is loaded with the emergency loads.

c ~

Once a month the quantity of diesel fuel available shall be logged.

d.

Each diesel generator shall be given an annual inspection in accordance with instructions based on the manufacturer's recommendations.

e.

Quarterly the quality of each diesel generator's (A, B, C,

and D) seven day fuel supply shall be checked.

The fuel oil quality shall be within the acceptable limits specified in Table 1 of ASTM-D975.

3.9/4.9-3 BFN Unit 2

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4 AUXILIARYELECTR CAL SYSTFM LIMITING CONDITIONS FOR OPERATION 3.9.A.

Auxiliar Electrical E ui ment SURVEILLANCE REQUIREMENTS 4.9.A.

Auxi ia Electrical S stem 4.9.A.4. (Cont'd) c.

The loss of voltage and degraded voltage relays which start the diesel generators from the 4-kV shutdown boards shall be calibrated annually for trip and reset and the measurements logged.

These relays shall be calibrated as specified in Table 4.9.A.4.c.

d.

4-kV shutdown board voltages shall be recorded once every 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

5.

Logic Systems 5.

480-V RMOV Boards 2D and 2E a.

Common accident signal logic system is OPERABLE.

a.

Once per operating cycle the automatic transfer feature for 480-V RMOV boards 2D and 2E shall be functionally tested to verify auto-transfer capability.

b.

480-V load shedding logic system is OPERABLE.

6.

There shall be a minimum of 35,280 gallons of.

diesel fuel in each of the 7-day diesel-generator fuel tank assemblies.

3.9/4.9-7 BFN Unit 2

'I

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 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 500-kV transmission

system, and the diesel generators.

The unit station-service transformer B for unit 1 or the unit station-service transformer B for unit 2 provide noninterruptible sources of offsite power from the 500-kV transmission system to the units 1 and 2

shutdown boards.

Auxiliary power can also be supplied from the 161-kV transmission system through the common station-service transformers or through the cooling tower transformers by way of the bus tie board.

The 4-kV bus tie board may remain out of service indefinitely provided one of the required offsite power sources is not supplied from the 161-kV system through the bus tie board.

The minimum fuel oil requirement of 35,280 gallons for each diesel generator fuel tank assembly is sufficient for seven days of full load operation of each diesel and is conservatively based on availability of a replenishment supply.

Each diesel generator has its own independent 7-day fuel oil storage tank assembly.

The degraded voltage sensing relays provide a start signal to the diesel generators in the event that a deteriorated voltage condition exists on a 4-kV shutdown board.

This starting signal is independent of the starting signal generated by the complete loss of voltage relays and will continue to function and start the diesel generators on complete loss of voltage should the loss of voltage relays become inoperable.

The 15-day inoperable time limit specified when one of the three phase-to-phase degraded voltage relays is inoperable is justified based on the two-out-of-three permissive logic scheme provided with these relays.

A 4-kV shutdown board is allowed to be out of operation for a brief period to allow for maintenance and testing, provided all remaining 4-kV.

shutdown 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-V dc 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 unit motor loads, and alternative drive power for a 115-V ac unit-preferred mg set.

One 250-V dc system provides power for common plant and transmission system control functions, drive power for a 115-V ac plant-preferred mg set, and emergency drive power for certain unit large motor loads.

The four remaining systems deliver control power to the 4,160-V shutdown boards.

3.9/4.9-19 BFN Unit 2

4.9 Cg The monthly tests of the diesel generators are primarily to check for failures and deterioration in the system since last use.