ML18033B301
| ML18033B301 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/14/1990 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML18033B300 | List: |
| References | |
| NUDOCS 9005170261 | |
| Download: ML18033B301 (29) | |
Text
Enclosure Revisions To TVA BFN TS 277 Browns Ferry Nuclear Plant Units l, 2, and 3 9005170261 900514 PDR ADOCK 05000259 P PDC UNIT 1 EFFECTIVE PAGE LIST REMOVE INSERT 3.9/4.9-1 3.9/4.9-2 3.9/4.9-3 3.9/4.9-4 3.9/4.9-21 3.9/4.9-22 3.9/4.9-1 3.9/4.9-2*
3.9/4.9-3*
3.9/4.9 4+3.9/4.9-21 3.9/4.9.-22*
- Denotes overleaf or spillover page.
3.4.AUXILIARY ELEC RICAL SYSTEM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 Auxil a ectrica S ste 4.9 Aux a Electrical S stem licab Applies to all the auxiliary electrical power system.e Applies to the periodic testing requirements of the auxiliary electrical system.Ob ective To assure an adequate supply of electrical power for operation of those systems required for safety.~Ob ective Verify the.operability of the auxiliary electrical system.S ecification S ecification A.Auxi ia 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.A.6 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.
'.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 con-tinuous rating of the diesel generator, and the operation of the diesel fuel oil trans-fer pumps shall be demonstrated.
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 demonstrate full load carrying capability for'FN Unit 1"3.9/4.9-1 4 AUXILIARY ELECTRICAL S STE LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.uxilia Electrical E ui ment 4.9.A.Auxilia Electrical S ste 3.9.A.l.c.(Cont'd)(2)The 500-kV system is available to the units 1 and 2 shutdown boards through the unit 2 station-service transformer TUSS 2B 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.
4.9.A.l.a.(Cont'd)an interval of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.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.(3)The Trinity 161-kV line is available to the units'and 2 shutdown boards through both common station-service transformers.
Additional reporting requirements due to failures are noted in Table 4.9.A.All diesel generator starts shall be logged.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.(b)If unit 1 is in cold shutdown, only one common station-service transformer is required.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 o f the emergency buses and load shedding from the emergency buses.(2)The diesel starts from ambient condition on the auto-start signal, energizes the emergency buses with permanently connected loads, energizes the auto-connected emer-gency loads through BFN.Unit 1 3.9/4.9-2
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.Auxilia E ectrical E ui ment 4.9.A.Auxilia Electrical 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 to~er transformer may be substituted for a common station-service transformer.
load sequencing, and operates for greater than or equal to five minutes while its gener-ator is loaded with the emergency loads.(3)On diesel generator breaker trip, the loads are shed from the emer-gency buses and the diesel output breaker recloses on the auto-start signal, the emergency buses are energized with permanently connected loads, the auto-connected emergency loads are energized through load sequencing, and the diesel operates for gre'ater 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 inspec-tion in accordance with instructions based on the manufacturer's recommendations.
e.Quarterly the qual'ity 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.
BFN Unit 1 3.9/4.9-3 4 AUXILIARY ELECTRICAL SYSTEM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.Auxilia Electrical E ui ment 4.9.A.Auxilia Electrical S stem 2.The reactor shall not be started up (made critical)from the HOT STANDBY CONDITION unless all of the following conditions are satisfied:
2~DC Power System-Unit Batteries (250-V), Diesel-Generator Batteries (125-V)and Shutdown Board Batteries (250-V)a.At least one offsite power source is'" available as specified in 3.9.A.l.c.
a.Every week the specific gravity, voltage and temperature of the pilot cell and overall battery voltage shall be measured and logged.b.Three units.1 and 2 diesel generators shall be OPERABLE.b.Every three months the measurement shall be made of voltage of each cell to nearest O.l volt, specific gravity of each cell, and temperature of every fifth cell.These measurements shall be~logged.c.An additional source of power consisting of one of the following:
~(1)A second offsite power source available as specified in 3.9.A.l.c.
c.At least once every 24 months, a battery rated discharge (capacity) test shall be performed and the voltage, time, and output current measurements shall be logged.(2)A fourth OPERABLE units 1 and 2 diesel generator.
d.Requirements 3.9.A.3 through 3.9.A.6 are met.BFN.Unit 1 3.9/4.9-4 AMENDMENT go yg8
4.9 BASES (Cont'd)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.1 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 <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, assures that each diesel generator will be capable of supplying the maximum load during the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 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-D975-89.
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.
Xn 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.BFN ,Unit 1 4.9 BASES (Cont'd)REFERENCES 1.Normal Auxiliary Power System (BFNP FSAR Subsection 8.4)2.Standby AC Power Supply and Distribution (BFNP FSAR Subsection 8.5)3.250-V DC Power Supply and Distribution (BFNP FSAR Subsection 8.6)4.Memorandum from Gene M.Wilhoite to H.J.Green dated December 4, 1981 (LOO 811208 664)and memorandum from C.E.Winn to H.J.Green dated January 10, 1983 (G02 830112 002)~'FN Unit 1 3.9/4.9-22 MIBDMEHT NO.y gg
UNIT 2 EFFECTIVE PAGE LIST REMOVE INSERT 3.9/4.9-1 3.9/4.9-2 3.9/4.9-3 3.9/4.9-4 3.9/4.9-21 3.9/4.9-22 3.9/4.9-1 3.9/4.9-2*
3.9/4.9-3*
3.9/4.9 4+3.9/4.9-21 3.9/4.9-22*
- Denotes overleaf or spillover page.
4 AUXIL ARY ELECTRICAL SYS EM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 ILIARY ELECTRICAL SYS E 4.9 AUXILIARY ELEC R CAL SYSTEM A 1 cabi it A icab t 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.S ecification A.uxi ia Electrica F.ui ment Verify the operability of the auxiliary electrical system.S ecification A.uxilia 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.A.6 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.I f the unit 2 station-service transformer is the second sourc'e, 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 generator, and the operation of the diesel fuel oil transfer pumps shall be demonstrated.
Also the di'esel 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 demonstrate full load carrying capability for BFN ,.Unit 2 3.9/4.9-1
/4 AUXILIARY ELECTR CAL SYS EM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.Auxilia Electr cal E ui ment 4.9.A.Auxilia E ect ica S ste 3.9.A.l.c.(Cont'd)(2)The 500 kV system is available to the units 1 and 2 shutdown boards through the unit 2 station-service transformer TUSS 2B 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.
4.9.A.l.a.(Cont'd)an interval of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.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.
(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.(b)If unit 1 is in-cold shutdown, only one common station-service transformer is required.Additional reporting requirements due to failures are noted in Table 4.9.A..All diesel generator starts shall be logged.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 con-dition on the auto-start signal, energizes the emer-gency buses with permanently connec-ted loads, energizes the auto-connected BFN Unit 2 3.9/4.9-2
4 AUXIL ARY ELEC R CAL SYSTEM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.Auxilia Electrical E ui ment 4.9.A.Auxilia Electrica S stem 3.9.A.l.c.(Cont'd)4.9.A.l.b.(Cont'd)emergency loads through load sequencing, and operates for greater than or equal to five minutes while its generator is loaded with the emergency loads.(4)The Athens 161-kV line is available tothe 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.auto-start signal, the emergency buses are energized with permanently connected~loads, the auto-connected 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 inspec-tion 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 speci-fied in Table 1 of ASTM-D975.
BFN.:Unit 2 3.9/4.9-3 4.AUXILIARY ELEC AL SYSTE LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3;9.A.Auxilia Electrical E ui ment 4.9.A.Auxilia Electrical S stem 2.The reactor shall not be started up (made critical)from the HOT STANDBY CONDITION unless all of the following conditions are satisfied:
2;DC Power System-Unit Batteries (250-V), Diesel-Generator Batteries (125-V)and Shutdown Board Batteries (250-V)a.At least one offsite power source is available as specified in 3.9.A.l.c.
a.Every week the specific gravity, voltage and temperature of the pilot cell and overall battery voltage shall be measured and logged.b.Three units 1 and 2 diesel generators shall be OPERABLE.b.Every three months the measurement shall be made'f voltage of each cell to nearest 0.1 volt, specific gravity of each~cell, and temperature of every fifth cell.These measurements shall be logged.c.An additional source of power consisting of one of the following:
(1)A second offsite power source available as specified in 3.9.A.l.c.
c.At least once every 24'months, a battery rated discharge (capacity) test shall be performed and the voltage, time, and output current measurements shall be logged.(2)A fourth OPERABLE units 1 and 2 diesel generator.
d.Requirements 3.9.A.3 through 3.9.A.6 are met.BFN ,Unit 2 3.9/4.9-4 AMPHORA'5 NP gg$
4.9 BASES (Cont'd)The monthly tests of the diesel generators are 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 <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> assures that each diesel generator will be capable of supplying the maximum load during the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 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.The.diesel generators are shared by units 1 and 2.Therefore, the capability for the units 1 and 2 diesel generators to accept the emergency loads will be performed during the unit 1 operating cycle using the unit 1 loads.BFN tests the 7-day diesel generator fuel oil supplies=in accordance with Table 1 of ASTM-D975-89.
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.BFN Unit 2 3.9/4."9-21
4.9 BASES (Cont'd)The'eriodic 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 were the only source of electrical power.I REFERENCES 1.Normal Auxiliary Power System (BFNP FSAR Subsection 8.4)2.Standby AC Power Supply and Distribution (BFNP FSAR Subsection 8.5)3.250-V DC Power Supply and Distribution (BFNP FSAR Subsection 8.6)4.Memorandum from Gene M.Wilhoite to H.J.Green dated December 4, 1981 (LOO 811208 664)and memorandum from C.E.Winn.to H.J.Green dated January 10, 1983 (G02 830112 002)BFN Unit 2 3 9/4~9-22 AMENDMENT NO.I 4 9 UNIT 3 EFFECTIVE PAGE LIST REMOVE INSERT 3.9/4.9-1 3.9/4.9-2 3.9/4.9-3 3.9/4.9-4 3.9/4.9-20 3.9/4.9-21 3.9/4.9-1 3.9/4.9-2*
3.9/4.9-3*
3.9/4.9 4*3.9/4.9-20 3.9/4.9-21*
- Denotes overleaf or spillover page.
4.AUXILIARY ELECTRICAL S STEM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 Auxiliar Electrical S st 4.9 Auxilia E ectr cal S stem A licabi it Applies to all the auxiliary electrical power system.A licabilit Applies to the periodic testing requirements of the auxiliary electrical system.Ob ective~Ob ective To assure an adequate supply of electrical power'or operation of those systems required for safety.Verify the operability of the auxiliary electrical system.S ecification S ecification A.u ilia Electrica.E ui ment A.Aux lia Electrica S stem 1.PRIOR TO STARTUP from a COLD CONDITION, the following must be satisfied:
a.Diesel generators 3A,3B, 3C, and 3D OPERABLE.b.Requirements 3.9.A.3 through 3.9.A.6 are met.c.At least two of the following offsite power sources'are available:
(1)The 500-kV system is available to the unit 3 shutdown boards through the unit 3 station-service transformer TUSS 3B with no credit taken for the two 500-kV Trinity lines.1.Diesel Generators a.Each diesel generator shall be manually~, started and loaded to demonstrate operational readiness in accordance'ith 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 transfer pumps shall be demonstrated.
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 demonstrate full load carrying capability BFN ,Unit 3 3.9/4.9-1 4 AUX LIARY ELEC CAL SYS E LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.Auxi a Electrical E ui ment 3.9.A.l.c.(Cont'd)(2)The Trinity 161-kV line is available to the unit 3 shutdown boards through a common station-servt.ce or cooling tower.'ransformer.
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 3.4.9.A.Auxilia Electrical S stem 4.9.A.l.a.(Cont'd)for.an interval of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.The diesel generator fast starts (10 seconds)from standby conditions shall be performed once per 184 days in these surveil-lance 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.(3)The Athens 161-kV line is available to unit 3 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.'All diesel generator.starts shall be logged.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 con-dition on the auto-start signal, ener-gizes the emergency buses with perman-ently connected lo'ads, energizes the auto-connected emergency loads BFN ,rUnit 3 3.9/4.9-2
4 AUXILIARY ELEC R C L SYSTE LIMITING, CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A..Auxilia Electr ca gcLuuimerr t 3.9.A.l.c.(3)(Cont'd)4.9.A.A a Elect ca'~Ss tern 4.9.A.l.b.(Cont'd)NOTES FOR (2)AND (3): If both Athens and Trinity lines are claimed as the two offsite sources for unit"3, no credit may be taken for'he Athens-Trinity line tie breaker.Specifically, the Athens line supplies unit 3 through common station-service transformer A or cooling tower transformer 1, and the Trinity line must supply unit 3 through common station-service transformer B or cooling tower transformer 2.through load sequencing, and operates for greater than or equal to five minutes while its gener-ator is loaded with the emergency loads.(3)On diesel generator breaker trip, the loads are shed from the emergency buses and the diesel output breaker closes on the auto=start signal, the emergency buses are energized with permanently connected loads, the auto-connected emergency loads're 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 loggede d.Each diesel generator shall be given an annual inspection'n accordance with instructions based on the manufacturer's recommendations.
e.Quarterly the quality of each diesel generator's (3A;3B, 3C, and 3D)seven-day fuel load.supply, shall be checked.The fuel oil quality shall be'ithin the acceptable limits specified in'Table 1 of ASTM-D975.
BFN Unit 3 3.9/4.9-3 4 AUXILIARY ELE CAL SYSTEM LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9.A.Aux ia Elect ica E ui e t 4.9.A.Aux ia Electrical
~Sseem 2.The reactor shall not be started up (made critical)from the HOT STANDBY CONDITION unless all of the following conditions are satisfied:
2~DC Power S ste-Unit Batteries (250-V), Diesel-Generator Batteries (125-V)and Shutdown Board Batteries'250-V) a.At least one offsite power source is available as specified in 3.9.A.l.c.
a.Every week the specific gravity, voltage, and temperature of the pilot cell, and overall battery voltage shall be measured and logged.b.Three units 3 diesel generators shall be OPERABLE.b.Every three months the measurements shall be made of voltage of each cell to nearest 0.1 volt, specific gravity of each cell, and temperature of every'fifth cell.These measurements shall be logged.c.An additional source of power consisting of one'f the following:
(1)A second offsite power source available as specified in 3.9.A.l.c.
(2)A fourth unit 3 diesel generator OPERABLE.c.At least once every 24 months, a battery rated discharge (capacity) test shall be performed and the voltage, time, and output current measurements shall be logged.d.Requirements 3.9.A.3 through 3.9.Ae6 are met.BFN.Unit 3 3.9/4.9-4'AMENDMENT NO.g, p 9 4.9 BASES (Cont'd)The monthly tests of the diesel generators are 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 temperatur'es 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 <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> assu'res that each diesel generator will be capable of supplying the maximum load during the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 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-D975-89.
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 system 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 start buses or 4-kV shutdown boards.The periodic simulation of accident signals in conjunction with diesel generator voltage available signals will confirm the ability of the'80-V load shedding logic system to sequentially shed and restart 480-V loads if an accident signal were present, and diesel generator voltage were the only source of electrical power.BFN.Unit 3 3.9/4.9-20 4 v 4,9 Refere ces 1.Normal Auxiliary, Power System (BFNP FSAR Subsection 8.4)2.Standby AC Power Supply and Distribution (BFNP FSAR Subsection 8.5)3.250-V DC Power Supply and Distribution (BFNP FSAR Subsection 8.6)4.Memorandum from'G.M.Wilhoite to H.J.Green dated December 4, 1981 (LOO 811208 664)and memorandum from C.E.Winn to H.J.Green dated January 10, 1983 (G02 830112 002)BFN Unit 3~/3.9/4.9-21 AMENoMBr NG.I pC The diesel generator fuel oil system for each unit includes a day tank mounted on the diesel engine skid and a seven-day tank assembly embedded in the diesel generator building floor.Transfer between the seven-day tank assembly and the day tank is accomplished automatically by transfer pumps controlled by float operated switches which sense fuel oil level in the day tank.New fuel oil added to the seven-day tank assembly is tested in accordance with plant procedures.
In addition, the auxiliary boiler reservoirs may be used as a long-term backup fuel oil supply.These reservoirs are sampled quarterly and fuel oil is not allowed to be transferred to the seven-day tank assemblies until the quality is verified to be acceptable per ASTM-D975, Table l.>>The BFN surveillance requirements are being revised to specify that the fuel oil supply for each diesel generator is tested quarterly.
This change is consistent with standard industry fuel oil sampling practices, regulatory guidelines, and the GE standard TSs.The bases section is being revised to state that BFN tests each seven-day fuel oil supply in accordance with Table 1 of ASTM-D975-89 quarterly.
4.Existing LCO 3.9.A.6 currently reads: There shall be a minimum of 103,300 gallons of diesel fuel in the standby diesel-generator fuel tanks.Proposed change to LCO 3.9.A.6.would read: There shall be a minimum of 35,280 gallons of diesel fuel in each of the seven-day diesel generator fuel tank assemblies.
Justification for LCO 3.9.A.6 This specification is being changed to'require that there be a minimum of 35,280 ga'lions of diesel fuel in each of the diesel generator seven-day fuel tank assemblies.
This change is made to clarify the nature of the diesel generator fuel oil storage system and make it applicable to each diesel generator.
e At BFN there are two sets of four diesel generators (Unit 1 and 2 diesel generators A, B, C, and D;and Unit 3 diesel generators 3A, 3B, 3C, and ,3D).The current technical specifications imply the existence of one large fuel storage tank for each set of diesel generators and that this tank will be required to contain at least 103,300 gallons of diesel fuel oil.Actually,'each diesel generator has its own independent seven-day fuel oil storage tank assembly.The diesel fuel oil system has the capability to transfer fuel oil from the yard tank to the seven-day tank assemblies and between the seven-day tank assemblies for each set of diesel generators.
However, this transfer system is not seismically qualified; therefore, each diesel generator seven-day fuel tank assembly must contain enough fuel oil to operate the associated diesel generator ,for'even days.Regulatory Guide 1.137, Fuel Oil Systems for Standby Diesel Generators, requires an adequate fuel supply for operation-of the diesel engines during the maximum expected time interval between replenishment.
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