ML20099H361

Proposed TS 3/4.8.2 & Bases Re Limiting Conditions for Operation for Electrical Power Sys Dc Sources - Operating

ML20099H361
Person / Time
Site:	Catawba
Issue date:	08/05/1992
From:	DUKE POWER CO.
To:
Shared Package
ML20099H359	List: ML20099H357 ML20099H361
References
NUDOCS 9208190008
Download: ML20099H361 (18)

Text

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P ATTACIIMENT 1 REVISED PROPOSED CATAWilA TECIINICAL SPECIFICATIONS CIIANGES L

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ELECTRICAL POWER SYSTEMS N0 CHANGE 3 fHl3 PACE AHON0Nti 3/4.8.2 0.C. SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.0.2.1 The following D.C. channels and trains shall be OPERABLE and energized:

Channel I consisting of 125-Volt 0.C. Bus No. EDA, 125-Volt D.C.

Battery Bank No. EBA and a f ull-capacity charger,*

b.

Channel 2 consisting of 125-Volt D.C. Bus No. EDB, 125-Volt D.C.

Battery Bank No. EBB and a full-capacity charger,*

c.

Channel 3 consisting of 125-Volt D.C. Bus No. EDC, 125-Volt D.C.

Battery Bank No. EBC and a full-capacity charger,"

d.

Channel 4 consisting of 125-Volt D.C. Bus No. EDD, 125-Volt D.C.

Battery Bank No. EBD and a full-capacity charger,"

e.

Train A consisting of 125-Volt D.C. Bus No. EDE, and f.

Train B consisting of 225-Volt D.C. Bus No. EDF.

APPLICABILITW MCDES 1, 2, 3, and 4 ACTION:

a.

With 125 VDC Bus EDE or EDF inoperable, restore the inoperable bus to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b.

With one 125 VDC Bus EDA, EDB, EDC or EDD inoperable, restore the inoperable bus to OPERABLE status within B hours or be in at least i

HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

c.

With either 125 VDC Battery Bank No. ESB or EBC and/or its full-capacity charger inoperable, restore the inoperable battery and/or full-capacity charger to OPERABLE status within 10 days, or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

d.

With either 125 VDC Battery Bank No. EBA or ESD and/or its full-capacity charger inoperable and 125 VDC diesel generator Batteries DGBA and DGBB and their full-capacity chargers in servi'ce powering Busses EDE and EDF during this period of time, restore the inoper-able battery and/or full-capacity charger to OPERABLE status wit'.:n "A vital bus may be disconnected from its D.C. source for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for the purpose of performing an equalizir.g charge on its associated battery bank provided that the vital busses associated with the other battery banks are OPERABLE and energi:ed.

Also when the spare charger is being used as a replacement for the normal battery charger verify that the A.C. input to the charger is from thu same A.C. division as the normal charger which 'it is replacing.

CATAWBA - Ur4ITS 1 & 2 3/4 8-12

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ELECTRICAL POWER SYSTEMS FOR INFORMAll0N ONLY LIMITING CONDITION FOR OPERATION ACTION (Continued) 10 days or be in at least HDT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, e.

With two 125 VOC batteries and/or their full-capacity chargers inoperable and 125 VDC Batteries EBA and EBC and/or their full-capacity chargers in service, or 125 VDC Batteries EBB and E80 and/or their full :apacity chargers ir service during this period of time, restore at least one battery and/or its full-capa:ity charger to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCEWEhUIREMENTS 4.8.2.1.1 Each 125 volt battery bank and charger shall be demonstrated OPERABLE:

a.

At least once per 7 days by verifying that:

1)

The parameters in Table 4.8-3 meet the Category A limits, 2)

The total battery terminal voltage is greater than or equal to 125 volts on float charge, and 3)

There is no visible indication of damaging electrolyte leakage.

b.

At least once per 92 days and within 7 da;i af ter a battery discharge with battery terminal voltage below 310 volts, or battery overcharge with battery terminal voltag: above 150 volts, by verifying that:

1)

The parameters in Table 4.8-3 meet the Category B limits, 2) ihere is no visible corrosion at either terminals or connectors, or the connection resistance of these items is less than 150 x 10 8 ohm, and 3)

The average electrolyte temperature of six connected cells is above 60*F.

c.

At least once per 18 months by verifying that:

1)

The cells, cell plates (if visible), and battery rscks show no visual indication of physical damage or abnormal u;;irioration, 2)

The cell-to-cel; and terminal connections are clean, tight, and coated with anticorrosion material, 3)

The resistance of each cell-to-cell and terminal connection is less than or equal to 150 x 10 8 ohm, and CATJ.VBA - UNITS 1 & 2 3/4 8-13 Amendment No. 26 (Unit 1) l Amendment No.16 (Unit 2) l 1

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e ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 4)

The battery charger will supply at least 200 amperes at a minimum of 125 volts for at least 8 nours.

Atleastonceper18monthsduringshutdownfbyverifyingthatthe l

d.

battery capacity is adequate to either:

1)

Supply and maintain in OPERABLE status all of the actual emergency loads for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> when the battery is subjected to a battery i

service test; or 2)

Supply a dummy load from Batteries EBA and EBD and from Bat-teries EBB and EBC of greater than or equal to 373 amperes for the first minute of the first hour, greater than or equal to 213 amperes for the next 59 minutes of the first hour 2nd a dummy load only from Batteries EBA and EBD of greater than or equal to 210 amperes for the second hour while maintaining the battery terminal voltage greater than or equal to 105 volts e.

At least once per 60 months, during shutdown, by verifying that the battery ~ capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test.

Once per 60 month interval this performance discharge test may be performed in lieu of the battery service test require 9 by Specification 4.8.2.1.1d.; and f.

At least once per 18 months, during shucdown, by giving performance discharge tests of battery capacity to any battery that shows signs of degradation or has reached 85% of the service life excacted for the application.

Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its average on previous performance tests, or is below 90% of the mar,ufacturer's rating.

4.8.2.1.2 Each 0.C. channel shall be determined OPERABLE and energized with tie breakers open between redundant busses at least once per 7 days by veri-fying correct breaker alignment, indicated power availability from the charger and battery, and voltage on the bus of greater than or aqual to 125 volts.

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MnArnent No.

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CATAWBA - UNITS 1 & 2 3/4 B-14

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3/4.8 ELECTRICAL POWER SYSTEMS f 0R INFORMAll0N ONLY BASES 3/4.8.1, 3/4.8.2 and 3/4.8.3 A.C. SOURCES, 0.0. SOURCES. and CNSITE POWER DISTRIBUTION The OPERABILITY of the A.C. and D.C power sources and associat>d distribu-tion systems during operation ensures that sufficient power will be available to supply the safety-related equipment required for:

(1) the safe shutdown of the facility, and (2) the micigation and control of accident conditions within the facility.

The minimum specified independent and redundant A.C. and D.C.

power sources and distribution systems satisfy the requirements of Genersl Design Criterion 17 of Appendix A to 10 CFR Part 50.

The ACTION requirements specified for the levels of degradation of the power sources prod de restriction upon continued facility operation commensurate with the level of degradation.

The OPERABILITY of the power sources are consistent with the initial condition assurations of the safety analyses and b

are based upon maintaining at least one redundant set of onsite A.C. and 0.C.

power sources and associated distribution systems OPERABLE during accicent conditions coincident with an assumed loss-of-offsite power and single failure of the other onsite A.C. source.

The A.C. and D.C. source allowable out-of-service times are based on Regulatory Guide 1.93, " Availability of Electrical Power Sources," December 1974.

Whe one diesel generator is inoperable, there is an additional ACTION requirement to dfy that all required systems, subsystems, trains, components and dev1.o, that deptad on the remaining CPERABLE diesel generator as a source of emergency power, are also OPERABLE, and that the steam-driven auxiliary feedwater pump is OPERABLE.

This require-ment is intended to provide assurance that a loss of-offsite power event w'll not result in a complete loss of safety function of critical systems dur iy the period one of the diesel generators is inoperable.

The term, verify, as used in this context means to administratively : heck by examining logs or other information to determine if certain components are out-of-service for maintenance or other reasons.

It does not mean to perform the Surveillance Requirements needed to demonstrate the OPERABILITY of the component.

The ACTION requirements for diesel generator testing in the event of the inoper-ability of other electric power sources also reflect the potential for degra-dation of the diesel generator due to excessive testing.

This concern has developed concurrently with increased industry experience with diesel genera-l tors and has been acknowledged by the NRC staff in Generic Letter 84-15.

l The OPERABILITf of the minimum specified A.C. and 0.C. power sources and c

associated distribution systems during shutdown and refueling ensures that:

(1) the facility can be maint:.ined in the shutdown or refueling condition for extended time periods, and (2) sufficient instrumentation and contrcl capa-bility is available for monitoring and maintaining the unit status.

The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guide 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971, 1.108, " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Syttems at Nuclear Power Plants," Revision 1, August 1977, Regulatory Guide 1.137, " Fuel-Oil Systemt for Standby Diesel Gener-atoes," Revisicn 1, October 1379, the NRC Staff Evaluatior. Report concerning the Reliability of Diesel Generators at Catawba, August 14, 1984, an.d Generic CATAWBA - UNITS 1 & 2 B 3/4 8-1 Amendment No.10 (Unit 1)

Amendment No. 3 (Unit 2) l 9 05/96

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ELECTRICAL POWER SYSTEMS JOR INf0RMAll0N ONLY BASES I

/..C.

SOURCES, D.C. SOURCES, and ONSITE POWER OISTRIBUTION (Continued)

Letter 84-15, " Proposed Staff Actions to Improve and Maintain Diesel Generator Reliability." If any other metallic structures (building, new or modified pip-ing systems, conduits) are placed in the ground near the Fuel Oil St.orage System or if the original system is modified, the adequacy and frequency of inspections for the Cathodic Protection System shall be reevaluated and adjusted in accord-ance with the manufacturer's recommendations.

The Surveillance Requirements for demonstrating the OPERABILITY of the station batteries-are based on the recommendations of Regulatory Guide 1.129,

" Maintenance Testing and Replacement nf Large Lead Storage Batte. ries for Nuclear Power Piants," February 1978, and IEEE S'd 450-1980, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generat'ng Stations and Substations."

Verifying average electrolyte temperature above the minimum for which tne battery was sized, total battery terminal voltage on float charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity.

Table 4.8-3 specifies the normal limits for each designated piant cell and ecch connected cell for electrolyte level, float voltage and specific gravity.

The limits for the designated pilot cells float voltage and specific gravity, greater than 2.13 volts and 0.015 below the manufacturer's 'ull charge s

specific _ gravity or a battery charger current that had stabilized at a low value, is characteristic of a charged cell with adequate capacity.

The normal limits for each connected cell for float voltage and specific gravity, greater than 2.13 volts and not more than 0,020 below the manufacturer s full charge specific gravity with an average specific gravity of all the connected cells not more than 0.010 below the manufacturer's full charge specific gravity, ensures the OPERABILITY and capability of the battery.

Operation with a battery cell's parameter outside the normal limit but within the allowable value specified in Table 4.8-3 is permitted for up to 7 days.

During this 7-day period:

(1) the allowable values for M ectrolyte level ens:res no physical damage to the plates with an adequate electron tran2fer capability; (2) the allowable value for the average specific gravity' of all the cells, not_more_than 0.020 below the manufacturer's recommended ful_1 charge specific gravity, ensures that the decrease in rating will be less tnan the safety margin provided in. sizing; (3) the allowable value for an individual i

cell's specific gravity, onsures that an individual cell's specific gravit,y will not be more than 0.040 below the manufacturer's full charg6. specific gravity and that the overall capability of the battery will be maintained within an acceptable limit; and (4) the allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capability to perform its design function.

-CATAWBA - UNITS 1 & 2 B 3/4 8-2 Amendment No.10(Unit 1)

Amendment No. 3 (Unit 2)

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NCharmind/Dhetunion Each unit at Catawba is provided with a separate 125-volt DC and 120-volt AC vital instmmentation and control (I&C) power system. The system provides a reliable, continuous source of power to Class IE instnunentation and controls. The system consists of four ladependent and physically separated load groups that supply I&C channels A, B, C, and D.

For the DC portion of the system, each load group contains its own battery, battery charger, DC dhtribution center, and DC panelboard.

Each of the 123 VDC batteries is sized to supply the continuous emergency load of its own load gmup and the loads of another load group for a period of one hour.

ch battery is also capable of supplying the anticipated inomentary loads during this one-honr period. The-batteries on Channels A and D are rated for 1200 ampere-hours and those on Channels B and C are rated for 825 ampere-hours. Tiie 1200 ampere-hour batteries have adequate capacity to supply these loads for two hours. The 825 ampere-hour batteries have adegaate capacity to supply these loads for a minimum of one hour. During nonnal operation, the batteries are 00ated on the DC dis'.ribution centers and are available to asume the loaus without interruption upon loss of a battery charger or AC power source. Each battery consists of 59 cells and is h>cated in a separate room in the Auxiliary Building.

Each battery charger is capable of supplying the steady state load 3 of ia own load group while charging its associated battery. A spare battery charger is provided to serve as a backup for any one of the nonnat battery chargers.

Bus tie breakers are pmvided between distribution centers A and C and between distribution

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centers B and D to allow the standby charger to feed a vital Las in case its normal charger is out of service and to allow the opposite battery to Hoat on the. bus when the bua main battery is oM u ervice. In this con 0guration, the affected bus and the associated cross-tied bus will vp d by two paralleled chargers and one battery. This is a normal alignment when Murt ace or testing is being perfonned on a battery or its associated charger. These tie b: b are manual breakers and are operated in accordance with approved pmcedures.

Figure 1 depicts the DC portion of the vital I&C power system.

Technical Specification Surveillance Requirement 4.8.2.1.1.d requies that a battery service test be conducted at least once every 18 months while the unit is shut down. Recently, t

- NRC Electrical Distribution System FunctionalInspection (EDSFI) was held at Catawba. As a result of the EDSFI, a violation (50-413, -414/92-01-02) was issued because Catawba had been conducting the 18-month battery service test while the unit was operating instead of while the unit was shut down, as required by technical specifications.

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Descrintion of PropsJ LThnicallnttlGrallmt.fhiulges

- Technical Speci0 cation Suneillance Requirement 4.8.2.1.1.d is modified to indicate via footnote that for battery 2EBD only, the 18-month service test may be conducted during n

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power operation on a one-time basis, provided the test is conducted prior to the expiration of c

the current grace period for this suiveillance requirement. The grace period will expire on

- August 24,1992. No changes to the Bases section of the Catawba Technical Specifications as they cunently exist are required to suppon this one-time amendment. The justincation for i

the proposed change, as well as the NRC Safety Evalur. tion Report (SER) for the change,

' will fonn the basis for this one-time amendment.

l AtillDrallon and Safety Analnis l

Because of the design of the DC ponion of the vital I&C power system at Catawba, deleting the shutdown requirement from Surveillance Requirement 4.8.2.1.1.d will have no significant effect upon nuclear safety. Due to Catawba's ability to cross-tic a vital bus to an alteniate battery as indicated in the above discussion and as illustrated in Figure 1, the affected channel will remain battery-backed while its battery is taken out of service in order to perfonn the service test. When a service test is being perfonned on a panicular battery, the I

associated battery charger is removed from service and the standby charger (ECS) is connected to the affected distribution center. Therefore, both a battery and two battery chargers remain available to supply the cross-tied channels during the test.

It should be noted that one af the Ondings of the Catawba EDSFI involved whether calculations support that a s. tall battery (825 ampere-hour) could adequately supply two channels in a cross-tied configuration while a large battery (1200 ampere-hour) is out of service. During the EDSFI audit, there was not suf0cient time to resolve the concern by updating the analytical model or correlating test ter.ults in detail.

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The 825 ampere hour battery calculations reviewed during the EDSFI are overly conservative because: 1) only two periods were established for the one-hour duty cycle (Grst minute =

1st period; last 59 minutes = 2nd period); 2) both non-continuous and momentary loads are assumed to be continuous for each respective period of the duty cycle; and,) loads were

- conservatively estinaated. Following the EDSFI, Duke Power Company has been in the l-process of revising this calculation. - Although the revision has not been finalized, preliminary assessments have identified specific conservatisms and demonstrate that the loads for the two channel cross-tied connguration are below the 825 ampere-hour battery capacity.

Table 1 details these specine load revisions, the respective bases for the load re/ision, and the revised load requirements for each period of the 825 ampere-hour battery duty cycle.

L Tabiu 2 incorporates the changes listed in Table I and details the total kiads for two channels L

being fed from a single 825 ampere-hour battery. Based on Table 2,- the adjusted battery I

discharge current is approximately 316 amperes for the first minute,200 amperes for the 1-10 minute period,198.5 amperes for the 10-20 minute period, and 188 amperes for the 20-60 minute period.L The corresponding battery tenninal end voltages are 112.7 VDC,115.1 ~

VDC,114.5 VDC, and 113.3 VDC, respectively.

-The actual state of the 825 ampere-hour battery reDects a capacity girater than the revised calculated requirement. In order to verify that the batteries can perfonn tneir design function, a service test is perfonned every 18 months. During the savice test, the batteries 1.

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e are discharged at a rate enveloping their respective load prunles. For the 825 ampere-hour battery, the values are 373 amperts for the 1)rst minute and 213 amperes for the next full 59 minutes per Surveillance Requirement 4.8.2.1.1.d2. In addition to the c.ervice test, a perfonnance test is also perfonned on each battery. During the perfonnance test, the battery is discharged at its manufacturer-specined discharge rate to detennine its actual capacity and to provide an indication of remaining life span.

Perfonnance test data shows that the battely execeded the technical specincation required l

capacity of 80%, with an excess of the required capacity of 44.4%. Service test data also shows that hattery 2 EBB is consistently capable of exceeding the required load profile

. discharge, Conclusions Deleting the sliutdown requirement of Technical Specification Surveillance Requirement 4,8.2.1.1.d and allowing the 18-month service test to be conducted during power operation for battery 2EBD on a one-time basis will have no adverse effect upon nuclear safety. _ The design conDguration of the DC portion of Catawba's vital I&C power system supports such i

an amendment. Neither plant personnel nor the public will be adversely affecteel by the proposed amendment.

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I Table I CNC-1381.0511 125VDC Vital instrumentation Control Power System Battery and Battery Charger Sizing Calculation

• Preliminary Revis_fons To DC Loads OLO NEW LPAD O-1 min 1-60 min 0-1 min 1-10 min 10-20 min 20-60 min BASIS FOR REVISION 4 KV switchgear contro!

67 6

67 3.3 13.3 3.3 Breaker operations match D/G Ioading.

power Load center cor. trol 20 2

20 1

1 1

Breaker operations match D/G loading.

power D/G foad sequencer 10.4 4

10.4 4

1.7 1.7 Sequencer is reset during first 10 minutes.

Auxiliary feedwater 18.3 7.7 6.7 0.5 0.5 0.5 Loads deenergize to safe position on feedwater isol controls Feedwater system 31.5 12.1 0.1 1.3 0.1 0.1 Loads deenergize to safe position on feedwater isol l

controls l

Reactor trip switchgear 8

10 12 1

1 1

Breakers are not rectosed.

l Containment valve 7.7 7.7 7.7 0.1 0.1 0.1 Valves are deenergized 1

post-LOCA.

injection water system Containment H2 sample 3.6 3.6 04 0.4 0.4 0.4 Evaluated for use of system post-LOCA.

and purge system i

Radiation monitoring 2.7 0.3 0.3 1.4 0.3 0.3 Only 1 solenoid energized at at a time.

Main steam vent to 2.3 2.3 0

2.3 2.3 2.3 Valves are deenergized post-LOCA.

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' CNC-1381.05-11 125VDC Vital Instrumentation Control Power System Battery and Battery Charger Sizing Calcu'.ation" -

1

,,Ps elimina.ry R..,evis_ ion _s,To,A.C L. o. ads. _.

i NF#

OLD LOAD 0-1 min 60 min 0-I min 1-10 min 20 min 20-60 min BASIS FOR HEVISION f

i UHI solenoids and 8.

4.7-0-

0 0

0 System has been deleted.

transmitters I

Auxiliary feedwater 4.5 1.5 0.1 0.1 0.1 0.1 Loads deenergize to safe controls position on feedwater isol.

l.

Solid state protection 7.5 7.5 2.7 2.7 2.7 2.7 Backup power supply not system needed.

Fuel pool ventilation -

3.7 2.6 03 03 0.3 0.3 No system actuation in first f

system hour post-LOCA.

Process instrumentation 7.2 7.2 3.6 3.6 3.2 3.2

-Some circuitry deleted (UM:).

and control 4

i 4

4 i

i TOIALS 30.9 23.5 6.7 6.7 6.3 6.3 5

3 4

I I

I t

Page 3

,a u%.

.w-

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ww s-

d I

BUS 0-1 min.

1-10 min.

10-20 min.

20-60 min.

0.67 0.67 0.67 0.67 1 EPB (ADC) 45.60 23.93 15.23 14.33 1 EPD (ADC) 1 ERP8 (AAC) 23.25 23.25 23.25 23.25 1 ERPD (AAC) 75.20 70.45 70.05 70.05 1.27 1.27 1.27 1.27 1EDB (ADC) 1.27 1.27 1.27 1.27 1EDD (ADC) 110.04 21.44 29.14 19.14 1EDF (ADC) 44.23 44.23 44.73 44.23 1 Er8 (ADC) 112.56 107.12 106.66 106.66 1 ElO (ADC) 315.64 199.93 198.47 187.57 Total DC Load for Two Load Charsets (ACC) 825 AH Battery Terminal start of period 112.7 115.1 115.1 115.1 Voltage Profile (VDC) end of period 112.7 115.1 114.5 113.3 TABLE 2: ADJUSTED BATTERY LOAD VALUES

ATTACIIMENT 3 REVISED NO SIGNIFICANT IIAZARDS CONSIDERATION AND ENVIRONMENTAL IMPACT ANALYSES

.._.._.m

...m.-

l No SignifkanMarants_CemidtrahnArnth$b t

Duke Power Company h ; mace the detennination that this amendment request involves a no significant hazards consideration by applying the standards established by the Conunission's regulation in 10 CFR 50.92. This ensures that operation of the facility in accordance with the proposed amendment would not:

1) involve a signiGeant increase in the probability or consequences of an accident

~

previously evaluated; or 2) create the possibility of a new or different kind of accident from any accident previously evaluated; or 3) involve a sign 10 cant r: duction in a margin of safety.

The Commission has provided guidelines penaining to the application of the three standards by listing specific examples in 48FR14870. Example vi relates to a change which either may restJt in some increase to the pmbability or consequences of a previously-analyzed accident or may reduce in some way a safety margin, but where the results of the change are clearly i

within all acceptable criteria with respect to the system or component specined in the Standani Review Plan.

In this case the change proposed by this request is similar to Example vi in that it results in the deletion on a one-time basis of a specine conditional requirement for conducting a test required Sy technical specit; cations.

The following evaluation measures aspects of this proposal against the Part 50.92(c) requirements to demonstrate that all three standards are satisGed.

Eirsdatulant The amendment would not involve a significant increase in the pmbability or consequences of an accident previously evaluated.

Perfonning a service test of the vital batteries while at power will not result in the initiation L

of any accident scenarios, therefore ihere will be no effect on the probability of any accident.

L The design of the DC ponio.' of Catawha's vital I&C }Ower system allows the battery E

service test to be condtieted at power xhile maintninin(.at an operable battery and battery

- charger to supply the affected bus. Therefore, all vital tu;., will n: main battery backed at l

all timesi ScComLStandant The amendment would not create the posibility of a new or different kind of accident from any kind of accident previously evaluated.

1

L '

J No accident causal mechanisms are introduced by conducting the service test of the vital batteries during power opemtion. No equipment will be opemted in a new or deleterious manner, therefore there will be no effect on accident causal mechanisms.

IldnLSlandittd l

The amendment would not involve a significant reduction in a margin of safeiy.

As demonstrated previously, the affected bus will remain battery backed at all times while conducting the service test, thereby inaintaining DC power redundancy. Therefore, there will be no significant effect on any safety margin.

11ased on the above and the supponing technicaljusti0 cation, Duke Power Company has concluded that there is no significant hazard considemtion involved in this amendment reque3t.

EulklulnitutalluinarLAnalnis The proposed technical specification amendment has been reviewed against the criteria of 10 l

CFR 51.22 for environmental considerations. The proposed amendment does not involve a L

significant hazards consideration, nor increase the types and amuunts of effluents that may be released offsite, nor increase individual or cumulative occupational radiation exposures.

Therefore, the proposed amendment meets the criteria given in 10 CFR 51.22(c)(9) for a categorical exclusion from the quirement for an Envirunmental Impact St.itement.

E