ML062200511

Technical Specifications, Correction to Amendment Nos. 353, 355, 354 for Oconee Units 1 and 2

ML062200511
Person / Time
Site:	Oconee
Issue date:	08/08/2006
From:	NRC/NRR/ADRO/DORL/LPLII-1
To:
Olshan L N, NRR/DORL, 415-1419
References
Download: ML062200511 (20)

Text

AC Sources - Operating B 3.8.1 B3.8 ELECTRICAL POWER SYSTEMS B 3.8.1 AC Sources - Operating BASES BACKGROUND The AC Power System consists of the offsite power sources (preferred power) and the onsite standby power sources, Keowee Hydro Units (KHU). This system Is designed to supply the required Engineered Safeguards (ES) loads of one unit and safe shutdown loads of the other two units and Is so arranged that no single failure can disable enough loads to jeopardize plant safety. The design of the AC Power System provides Independence and redundancy to ensure an available source of power to the ES systems (Ref. 1). The KHU turbine generators are powered through a common penstock by water taken from Lake Keowee.

The use of a common penstock Is justified on the basis of past hydro plant experience of the licensee (since 1919) which Indicates that the cumulative need to dewater the penstock can be expected to be limited to about one day a year, principally for Inspection, plus perhaps four days every tenth year.

The preferred power source Is provided from offsite power to the red or yellow bus in the 230 kV switchyard to the units startup transformer and the E breakers. The 230 kV switchyard Is electrically connected to the 525 kV switchyard via the autobank transformer. Emergency power Is provided using two emergency power paths, an overhead path and an underground path. The underground emergency power path Is from one KHU through the underground feeder circuit, transformer CT-4, the CT-4 Incoming breakers (SK breakers), standby bus and the standby breakers (S breakers). The standby buses may also receive offsite power from the 100 kV transmission system through transformer CT-5 and the CT-5 incoming breakers (SL breakers). The overhead emergency power path is from the other KHU through the startup transformer and the startup incoming breakers (E breakers). In addition to supplying emergency power for Oconee, the KHUs provide peaking power to the generation system. During periods of commercial power generation, the KHUs are operated within the acceptable region of the KHU operating restrictions.

This ensures that the KHUs are able to perform their emergency power functions from an Initial condition of commercial power generation. The KHU operating restrictions for commercial power generation are contained In UFSAR Chapter 16, (Ref. 2). The standby buses can also OCONEE UNITS 1, 2, & 3 Borrected by AmendmentNO B 3.8.1-1,ece us " 8, 2006 letter dated iiugust

AC Sources - Operating B 3.8.1 BASES BACKGROUND receive power from a combustion turbine generator at the Lee Steam (continued) Station through a dedicated 100 kV transmission line, transformer CT-5, and both SL breakers. The 100 kV transmission line can be supplied from a Lee combustion turbine (LCT) and electrically separated from the system grid and offslteloads. The minimum capacity available from any of the multiple sources of AC power is 22.4MVA (limited by CT-4 and CT-5 transformer capacities).

APPLICABLE The Initial conditions of design basis transient and accident analyses SAFETY ANALYSIS in the UFSAR Chapter 6 (Ref. 4) and Chapter 15 (Ref. 5) assume ES systems are OPERABLE. The AC power system is designed to provide sufficient capacity, capablidy, redundancy, and reliability to ensure the avalabllity of necessary power to ES systems so that the fuel, reactor coolant system, and containment design limits are not exceeded.

Consistent with the accident analysis assumptions of a loss of offsite power (LOOP) and a single failure of one onsite emergency power path, two onsite emergency power sources are required to be OPERABLE.

AC Sources - Operating are part of the primary success path and function to mitigate an accident or transient that presents a challenge to the Integrity of a fission product barrier. As such, AC Sources -

Operating satisfies the requirements of Criterion 3 of 10 CFR 50.36 (Ref. 3).

LCO Two sources on separate towers connected to the 230 WV switchyard to a unit startup transformer and one main feeder bus are required to be OPERABLE. Two KHUs with one capable of automatically providing power through the underground emergency power path to both man feeder buses and the other capable of automatically providing power through the overhead emergency power path to both main feeder buses are required to be OPERABLE. The Keowee Reservoir level is required to be 2 775 feet above sea level to support OPERABILITY of the KHIUs.

The zone overlap protection circuitry Is required to be OPERABLE when the overhead electrical disconnects for the KHU associated with the underground power path are closed to provide single failure protection for the KHUs. The zone overlap protection circuitry Includes the step-up transformer lookout, the underground KHU lockout, the Keowee emergency start signal, and the underground breaker for the overhead KHU to ensure the zone overlap protection circuitry logic Is OPERABLE.

OCONEE UNITS 1, 2, & 3 63.8.1-2 mendmenett t ugust 8, 2006 j Corrected by etter dateu

AC Sources - Operating B 3.8.1 BASES LCO Operable offsite sources are required to be 'physically Independent" (continued) (separate towers) prior to entering the 230 kV switchyard. Once the 230 kV lines enter the switlhyard, an electrical pathway must exist through OPERABLE power circi breakers (PCBs) and disconnects such that both sources are available to energize the Unit's startup transformer either automatically or wfth operator action. Once within the boundary of the switchyard, the elecrical pathway may be the same for both independent offsite sources. In addition, at least one E breaker must be available to automatically supply power to a main feeder bus from the energized startup transformer. The voltage provided to the startup transformer by the two Independent offsite sources must be sufficient to ensure ES equipment w, operate. Two of the folowing offslte sources are required:

1) Jocassee (from Jocassee) Black or White,

2) Dacus (from North Greenville) Black or White,

3) Oconee (from Central) Black or White,

4) Calhoun (from Central) Black or White,

5) Autobank transformer fed from either the Asbury (from Newport), Norcross (from Georgia Power), or Katoma (from Jocassee) 525 kV line.

An OPERABLE KHU and its required emergency power path are required to be able to provide sufficient power within specified limits of voltage and frequency within 23 seconds after an emergency start Initiate signal and Includes its required emergency power path, required Instrumentation, controls, auxiliary and DC power, cooling and seal water, lubrication and other auxiliary equipment necessary to perform Its safety function. Two emergency power paths are available. One emergency power path consists of an underground drcuit while the other emergency power pathway uses an overhead circuit through the 230 kV switchyard.

OCONEE UNITS 1, 2, & 3 B 3.8.1-3 Amendment Nos.

Corrected by letter datedl August 8, 2006

,AC Sources - Operating B 3.8.1 BASES LCO This LCO Is modified by three Notes. Note I hidicates that a unit startup (continued) transformer may be shared with a unit in MODES 5 and 6. Note 2 Indicates that the requirements of Specification 5.5.18, "KHU Commercial Power Generation Testing Program," shall be met for commercial KHU power generation. Note 3 Indicates that the requirements of Specification 5.5.19, "Lee Combustion Turbine Testing Program," shagl be met when a Lee Combustion Turbine (LCT) is used to comply with Required Actions.

APPLICABILITY The AC power sources are required to be OPERABLE In MODES 1, 2, 3, and 4 to ensure that:

a. Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of accidents and transients, and

b. Adequate core cooling Is provided, and containment OPERABILITY and other vital functions are maintained In the event of a postulated accident.

AC source requirements during MODE 5 and 6 are covered In LCO 3.8.2, AC Sources-Shutdown.

ACTIONS The ACTIONS are modified by a Note. The Note excludes the MODE change restriction of LCO3.0.4 when both standby buses are energized from an LCT via an Isolated power path to comply with Required Actions.

This exception allow entry into an applicable MODE while relying on the ACTIONS even though the ACTIONS may eventually require a unit shutdown. This exception Is acceptable due to the additional capabilities afforded when both standby buses are energized from an LCT via an Isolated power path.

A.1. A.2., A.3.1. and A.3.2 Inthe event a startup transformer becomes Inoperable, it effectively causes the emergency overhead power path and both of the offslte sources to be Inoperable. A KHU and Its required underground power path remain available to ensure safe shutdown of the unit Inthe event of a transient or accident without a single failure.

OCONEE UNITS 1, 2, & 3 B 3.8.1-6 Amendment Nos. I Corretted by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS A.1, A.2, A.3.1, and A.3.2 (continued)

Operation may continue provided the KHU and its required underground emergency power path are tested using SR 3.8.1.3 within one hour if not performed Inthe previous 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. This Required Action provides assurance that no undetected failures have occurred In the KHU and its required underground emergency power path. Since Required Action A.1 only specifies "perform," a failure of SR 3.8.1.3 acceptance criteria does not result In a Required Action not met. However, if the KHU and its required underground emergency path falls SR 3.8.1.3, both emergency power paths and both required offsite circuits are Inoperable, and Condition I for both KHUs and their required emergency power paths inoperable for reasons other than Condition G and H is entered concurrent with Condition A.

If available, another Unit's startup transformer should be aligned to supply power to the affected Unit's auxiliaries so that offsite power sources and the KHU and its required overhead emergency power path will also be available If needed. Although this alignment restores the availability of the offslte sources and the KHU and Its required overhead emergency power path, the shared startup transformer's capacity and voltage adequacy could be challenged under certain DBA conditions.

The shared alignment is acceptable because the preferred mode of Unit shutdown is with reactor coolant pumps providing forced circulation and due to the low likelihood of an event challenging the capacity of the shared transformer during a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period to bring a Unit to MODE 5.

Required Action A.3.1 requires that the unit startup transformer be restored to OPERABLE status and normal startup bus alignment In 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> or Required Action 3.2 requires designating one unit sharing the startup transformer, to be shutdown. For example, IfUnit I and 2 are operating and CT-2 becomes Inoperable, Unit 2 may align CT-1 to be available to the Unit 2 main feeder buses and continue operating for up to 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. At that time, If CT-2 has not been restored to OPERABLE status, one Unit must be "designated" to be shutdown. The designated Unit must be shut down per ACTION B. Note that with one Unit In MODES 1, 2, 3 or 4 and another Unit In a condition other than MODES 1, 2, 3, or 4, the units may share a startup transformer Indefinitely provided that the loads on the unit not In MODES 1, 2, 3 or 4 are maintained within acceptable limits. For example, if Unit I Is In MODE 5 and CT-2 becomes Inoperable, Unit 2 may align CT-1 to the Unit 2 main feeder buses and continue operation Indefinitely.

OCONEE UNITS 1, 2, & 3 B 3.8.1-7 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS B.1 and B.2 (continued)

When a unit is designated to be shutdown due to sharing a unit startup transformer per Required Action A.3.2, the unit must be brought to a MODE In which the LCO does not apply, since the shared unit startup transformer's capacity could be challenged under certain DBA conditions.

To achieve this status, the unit must be brought to at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions In an orderly manner and without challenging unit systems.

C.1. C.2.1, C.2.2.1, 0.2.22, C.2.2.3. Q.22.4, and C.2.2.5 With the KHU or Its required overhead emergency power path Inoperable due to reasons other than an inoperable startup transformer (Condition A), sufficient AC power sources remain available to ensure safe shutdown of the unit In the event of a transient or accident. Operation may continue Ifthe OPERABILITY of the remaining KHU and Its required underground emergency power path Is determined by performing SR 3.8.1.3 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Ifnot performed Inthe previous 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and once every 7 days thereafter. This demonstration assures the remaining emergency power path Is not Inoperable due to a common cause or other failure. Testing on a 7 day Frequency is acceptable since both standby buses must be energized from an LCT via an isolated power path when in Condition C for > 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. When the standby buses are energized by an LOT via an Isolated power path, the likelihood that the OPERABLE KHU and its required underground emergency power path will be required Is decreased. Since Required Action C.1 only specifies

• perform," a failure of SR 3.8.1.3 acceptance criteria does not result In a Required Action not met. SR 3.8.1.3 Is only required to be performed when the KHU associated with the underground emergency power path Is OPERABLE.

If the KHU and Its required underground emergency path falls SR 3.8.1.3, both KHUs and their required emergency power paths are inoperable, and Condition I (Both KHUs or their required emergency power paths Inoperable for reasons other than Condition G or H) Is entered concurrent with Condition C.

OCONEE UNITS 1, 2, & 3 B 3.8.1-8 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS C.1. C.2.1, C.2.2.1, C.2.2., C.2.2.3. C.2.2.4. and C.2.2.5 (continued)

If the Inoperable KHU or Its required overhead emergency power path are not restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> as required by Required Action C.2.1, a controlled shutdown must be Initiated as required by the Required Actions for Condition M unless the extended Completion Times of Required Action C.2.2.5 are applicable. The second Completion Time for Required Action C.2.1 establishes a limit on the maximum time allowed for a KHU to be Inoperable during any single contiguous occurrence of having a KHU inoperable. If Condition C is entered as a result of switching an Inoperable KHU from the underground to the overhead emergency power path, it may have been Inoperable for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This could lead to a total of 144 hours0.00167 days <br />0.04 hours <br />2.380952e-4 weeks <br />5.4792e-5 months <br /> since the Initial failure of the KHU. The second Completion Time allows for an exception to the normal "time zero" for beginning the allowed time "clock." This will result In establishing the Otirne zero' at the time the KHU become Inoperable, Instead of at the time Condition C was entered.

The extended Completion Times of Required Action C.2.2.5 apply when the KHU or its required overhead emergency power path Is Inoperable due to an Inoperable Keowee main step-up transformer or an Inoperable KHU (if not used for that KHU In the previous 3 years). In order to use the extended Completion limes, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of entering Condition C both standby buses must be energized from an LCT (Required Action C.2.2.1), KHU generation to the grid except for testing must be suspended (Required Action C.2.2.2), the remaining KHU and its required underground emergency power path and both required offsite sources must be verified OPERABLE, the LCOs Indicated in Required Action C.2.2.3 must be verified.to be met, and alternate power source capability must be verified by performing SR 3.8.1.16.

Required Action C.2.2.5 permits maintenance and repair of a Keowee main step-up transformer which requires longer than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

Transformer replacement Is rare but is time extensive. A 28 day Completion Time Is permitted by Required Action C2.2.5 to restore the KHU and its overhead power path to OPERABLE status when Inoperable due to an Inoperable Keowee main step-up transformer. This allows a reasonable period of time for transformer replacement.

Required Action C.2.2.5 also permits maintenance and repair of a KHU which requires longer than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The primary long term maintenance Items are expected to be hydro turbine runner and discharge ring welding OCONEE UNITS 1, 2. & 3 B 3.8.1-9 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS C.1. C.2.11, .C2.2.1, C.2.2.2, C.2.2.3. C.2.2.4, and C.2.2.5 (continued) repairs which are estimated to be necessary every six to eight years.

Also, generator thrust and guide bearing replacements are necessary.

Other Items which manifest as failures are expected to be rare and may be performed during the permitted maintenance periods. As such, the 45 day restoration time of Required Action C.2.2.5 is allowed only once In a three year period for each KHU. This Completion Time is 45 days from discovery of Initial Inoperability of the KHU. This effectively limits the time the KHU can be Inoperable to 45 days from discovery of Initial inoperability rather than 45 days from entry Into Condition C and precludes any additional time that may be gained as a result of switching an Inoperable KHU from the underground to the overhead emergency power path.

Required Actions C.2.2.1, C.2.2.2, C.22.3, and C.2.2.4 must be met in order to allow the longer restoration times of Required Action C.2.2.5.

Required Action C.2.2.1 requires that both standby buses be energized using an LCT through the 100 kV transmission circuit. With this arrangement (100 kV transmission circuit electrically separated from the system grid and all offsIte loads), a high degree of reliability for the emergency power system is provided. In this configuration, the LCT Is serving as a second emergency power source, however, since the 100 kV transmission circuit Is vulnerable to severe weather a time limit is Imposed. The second Completion Time of Required Action C.2.2.1 permits the standby buses to be re-energized by an LCT within I hour in the event this source is subsequently lost. Required Action C.2.2.2 requires suspension of KHU generation to the grid except for testing.

The restriction reduces the number of possible failures which could cause loss of the underground emergency power path. Required Action C.2.2.3 requires verifying by administrative means that the remaining KHU and its required underground emergency power path and both required offsIte sources are OPERABLE. This provides additional assurance that offslte power will be available. In addition, this assures that the KHU and its required underground emergency power path are available.

Required Action C.2.2.3 also requires verifying by administrative means that the requirements of the following LCOs are met:

OCONEE UNITS 1, 2, & 3 B 3.8.1-10 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS C.1. C.21. C.22.1. C.2.2.2. C.2.2.3. C.2.2.4, and C.2.2.5 (continued)

LOO 3.8.3, "DC Sources - Operating;"

LCO 3.8.6, Vital Inverters - Operating;"

LCO 3.8.8, "Distribution Systems - Operating;"

LCO 3.3.17, 'EPSL Automatic Transfer Function;'

LCO 3.3.18, 'EPSL Voltage Sensing Circuits;'

LCO 3.3.19, "EPSL 230 kV Switchyard DGVP;" and LO 3.3.21, "EPSL Keowee Emergency Start Function.'

This increases the probability, even in the unlikely event of an additional.

failure, that the DC power system and the 120 VAC Vital Instrumentation power panelboards will function as required to support EPSL, power will not be lost to ES equipment, and EPSL will function as required.

Verifying by administrative means allows a check of logs or other Information to determine the OPERABILITY status of required equipment In place of requiring unique performance of Surveillance Requirements.

Ifthe AC Source Is subsequently determined Inoperable, or an LCO stated In Required Action C.2.2.3 Is subsequently determined not met, continued operation up to a maximum of four hours is allowed by ACTION L Required Action C.2.2.4 requires verifying alternate power source capability by performing SR 3.8.1.16. This confirms that entry Into Condition C Is due only to an Inoperable main step-up transformer or an Inoperable KHU, as applicable. If SR 3.8.1.16 is subsequently determined not met, continued operation up to a maximum of four hours Is allowed by ACTION L OCONEE UNITS 1,2, & 3 B 3.8.1-11 Amendment Nos. I Corrected by letter dated August 8, 20*6

AC Sources - Operating B 3.8.1 BASES ACTIONS D.1. D.2 and D.3 (continued)

With the KHU or Its required underground emergency power path Inoperable, sufficient AC power sources remain available to ensure safe shutdown of the unit In the event of a transient or accident. Operation may continue for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> if the remaining KHU and its required overhead emergency power path are tested using SR 3.8.1.4 within one hour If not performed in the previous 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. SR 3.8.1.4 is only required to be performed when the KHU associated with the overhead emergency power path Is OPERABLE. This Required Action provides assurance that no undetected failures have occurred Inthe overhead emergency power path. Since Required Action D.1 only specifies "perform," a failure of SR 3.8.1.4 acceptance criteria does not result in a Required Action not met. However, If the KHU and its required overhead emergency path falls SR 3.8.1.4, both KHUs and their required emergency power paths are inoperable, and Condition I for both KHUs and their emergency power paths Inoperable for reasons other than Condition G or H is-entered concurrent with Condition D. This demonstration is to assure that the remaining emergency power path is not Inoperable due to a common cause or due to an undetected failure.

For outages of the KHU and its required underground emergency power path in excess of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, an LCT (using the 100 kV transmission circuit electrically separated from the grid and offsite loads) must energize a standby bus prior to the outage exceeding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. This ensures the availability of a power source on the standby buses when the KHU and Its required underground emergency power path are out of service In excess of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The second Completion Time of Required Action D.2 permits the standby buses to be re-energized by an LCT within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> In the event this source is subsequently lost.

The second Completion Time for Required Action D.3 establishes a limit on the maximum time allowed for a KHU to be Inoperable during any single contiguous occurrence of having a KHU Inoperable. If Condition D is entered as a result of switching an Inoperable KHU from the overhead to the underground emergency power path, it may have been Inoperable for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This could lead to a total of 144 hours0.00167 days <br />0.04 hours <br />2.380952e-4 weeks <br />5.4792e-5 months <br /> since the Initial failure of the KHU. The second Completion Time allows for an exception OCONEE UNITS 1, 2, & 3 B 3.8.1-12 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources .-- Operating B 3.8.1 BASES ACTIONS D.1. D.2 and D.3 (continued) to the normal *time zero! for beginning the allowed time 'clock.' This will result in establishing the "time zero' at the time the KHU become Inoperable, Instead of at the time Condition D was entered.

I E.1 and E.2 It the Required Action and associated Completion Time for Required Action D,2 are not met, the unit must be brought to a MODE In which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for one Oconee unit and 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for other Oconee unit(s) and to MODE 5 within 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions In an orderly manner and without challenging plant systems.

F.1 and F.2 With the zone overlap protection circuitry Inoperable when the overhead electrical disconnects for the KHU associated with the underground power path are closed, the zone overlap protection circuitry must be restored to OPERABLE status or the overhead electrical disconnects must be opened within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. In this Condition, both KHUs and their required emergency power paths are OPERABLE, however a single failure could result In the loss of both KHUs.

G.1 With both emergency power paths Inoperable due to an E breaker and S breaker Inoperable on the same main feeder bus, one breaker must be restored to OPERABLE status. In this Condition, both emergency power paths can still provide power to the remaining main feeder bus.

OCONEE UNITS 1,2, &3 B 3.8.1-13 Amendment Nos. I.

Corrected by letter dated August 8, 2006 C

AC Sources - Operating B 3.8.1 BASES ACTIONS H.1 and H.2 (continued)

With both KHUs or their required emergency power paths Inoperable for planned maintenance or test with both standby buses energized from an LCT via an Isolated power path, the KHU must be restored to OPERABLE status within 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />. Operation with both KHUs and their required power paths Inoperable is permitted for 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br /> provided that both standby buses are energized using an LCT through the 100 kV transmission circuit and the requirements of the Note to the Condition are met. The Note to the Condition indicates that it may only be entered when both offsite sources are verified by administrative means to be OPERABLE and the requirements of the following LCOs are verified by administrative means to be met:

LCO 3.8.3, "DC Sources - Operating;"

LCO 3.8.6, Vital Inverters - Operating;*

LCO 3.8.8, "Distribution Systems - Operating;"

LCO 3.3.17, aEPSL Automatic Transfer Function;,

LCO 3.3.18, "EPSL Voltage Sensing Circuits;" and LCO 3.3.19, hEPSL 230 kV Switchyard DGVP."

This Increases the probability, even in the unlikely event of an additional failure, that the DC power system and the 120 VAC Vital Instrumentation power panelboards will function as required to support EPSL, power will not be lost to ES equipment, and EPSL will function as required.

OCONEE UNITS 1,2, & 3 B 3.8.11-14 Amendment Nos. I Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS H.1 and H.2 (continued)

Verifying by administrative means allows a check of logs or other information to determine the OPERABILITY status of required equipment in place of requiring unique performance of Surveillance Requirements.

If the AC Source is subsequently determined Inoperable, or an LCO stated in the Note to Condition H is subsequently determined not met, continued operation up to a maximum of four hours Is allowed by ACTION L With both standby buses energized from an LCT via an Isolated power path (100 kV transmission circuit electrically separated from the system grid and all offslte loads), a high degree of reliability for the emergency power system is provided. In this configuration, the LCT is serving as a second emergency power source, however, since the Oconee Units are vulnerable to a single failure of the 100 kV transmission circuit a time limit of 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br /> Is Imposed. Required Action H.1 permits the standby buses to be re-energized by an LCT within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> In the event this source is subsequently lost.

If both emergency power paths are restored, unrestricted operation may continue. If only one power path Is restored, operation may continue per ACTIONS C or D.

1.1. 1.2. and 1.3 With both KHUs or their required emergency power paths Inoperable for reasons other than Conditions G and H, Insufficient standby AC power sources are available to supply the minimum required ES functions. In this Condition, the offslte power system Is the only source of AC power available for this level of degradation. The risk associated with continued operation for one hour without an emergency power source is considered acceptable due to the low likelihood of a LOOP during this time period, and because of the potential for grid Instability caused by the simultaneous shutdown of all three units. This instability would Increase the probabiiy of a total loss of AC power. Operation with both KHUs or their required power paths Inoperable is permitted for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> provided that Required Actions 1.1 and 1.2 are met. Required Action 1.1 requires that both standby buses be energized using an LCT via an isolated power OCONEE UNITS 1, 2, & 3 B 3.8.1 -15 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS 1.1. 1.2. and 1.3 (continued) path. With this arrangement (100 kV transmission circuit electrically separated from the system grid and all offsite loads), a high degree of reliability for the emergency power system Is provided. In this configuration, the LCT Is serving as a second emergency power source, however, since the Oconee Units are vulnerable to a single failure of the 100 kV transmission circuit a time limit of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Is imposed. The second Completion Time of Required Action 1.1 permits the standby buses to be re-energized by an LCT within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> In the event this source Is subsequently lost. Required Action 1.2 requires that the OPERABILITY status of both offsite sources be determined by administrative means and that the OPERABILITY status of equipment required by the following LCOs be determined by administrative means:

LCO 3.8.3, "DC Sources - Operating;'

LCO 3.6.6, 'Vital Inverters - Operating;*

LCO 3.8.8, 8Distnlbution Systems - Operating;*

LCO 3.3.17, "EPSL Automatic Transfer Function;*

LCO 3.3.18, "EPSL Voltage Sensing Circuits;' and LCO 3.3.19, 'EPSL 230 kV Switchyard DGVP."

This Increases the probability, even In the unlikely event of an additional failure, that the DC power system and the 120 VAC Vital Instrumentation power panelboards Will function as required to support EPSL, power will not be lost to ES equipment, and EPSL will function as required.

Determining by administrative means allows a check of logs or other Information to determine the'OPERABILITY status of required equipment in place of requiring unique performance of Surveillance Requirements.

If the AC Source Is Initially or subsequently determined Inoperable, or an LCO stated In Required Action 1.2 Is Initially or subsequently determined not met, continued operation up to a maximum of four hours is allowed by ACTION L.

If both emergency power paths are restored, unrestricted operation may continue. Ifonly one power path is restored, operation may continue per ACTIONS C or D.

OCONEE UNITS 1, 2, & 3 B 3.8.1-16 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS J.1. J.2, and J.3 (continued)

With one or both required offsite sources inoperable for reasons other than Condition A, sufficient AC power sources are available to supply necessary loads In the event of a DBA. However, since the AC power system Is degraded below the Technical Specification requirements, a time limit on continued operation Is Imposed. With only one of the required offsIte sources OPERABLE, the likelihood of a LOOP Is Increased such that the Required Actions for all required offsite circuits Inoperable are conservatively followed. The risk associated with continued operation for one hour without a required offsite AC source is considered accbptable due to the low likelihood of a LOOP during this time period, and because of the potential for grid Instability caused by the simultaneous shutdown of all three units.

Operation with one or both required offsite sources Inoperable Is permitted for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided that Required Actions J.1 and J.2 are meeL Required Action J.1 requires that both standby buses be energized using an LCT via an Isolated power path. With this arrangement (100 kV transmission circuit electrically separated from the system grid and all offslte loads), a high degree of reliability for the emergency power system is provided. In this configuration, the LCT Is serving as an emergency power source, however, since the Oconee units are vulnerable to a single failure of the 100 kV transmission circuit a time limit Is Imposed. The second Completion Time of Required Action J.1 permits the standby buses to be re-energized by an LCT within I hour in the event this source Is subsequently ost. Required Action J.2 requires that the OPERABIUTY status of both KHUs and their required emergency power paths be determined by administrative means and that the OPERABILITY status of equipment required by the following LCOs be determined by administrative means:

LCO S.8.3, 'DC Sources - Operating;"

LCO 3.8.6, 'Vital Inverters - Operating;"

LCO 3.8.8, "Distribution Systems - Operating;"

LCO 3.3.17, "EPSL Automatic Transfer Function;'

LCO 3.3.18, "EPSL Voltage Sensing Circuits;'

LCO 3.3.19, 'EPSL 230 kV Switchyard DGVP," and LCO 3.3.21, "EPSL Keowee Emergency Start Function.'

OCONEE UNITS 1, 2. & 3 B 3.8.1-17 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS J.1, J.2, and J.3 (continued)

This Increases the probability, even in the unlikely event of an additional failure, that the DC power system and the 120 VAC Vital Instrumentation power panelboards will function as required to support EPSL, power will not be lost to ES equipment, and EPSL will function as required.

Determining by administrative means allows a check of logs or other information to determine the OPERABILITY status of required equipment In place of requiring unique performance of Surveillance Requirements.

If the AC Source Is Initially or subsequently determined Inoperable, or an LCO stated in Required Action J.2 is Initially or subsequently determined not met, continued operation up to a maximum of four hours Is allowed by ACTION L K.1 The two trip circuits for each closed N and SL breakers are required to ensure both breakers will open. An N breaker trip circuit encompasses those portions of the breaker control circuits necessary to trip the associated N breaker from the output of the 2 out of 3 loglc matrix formed by the auxiliary transformers undervoltage sensing circuits up to and including an Individual trip coil for the associated N breaker. The undervoltage sensing channels for the auxiliary transformer are addressed In LCO 3.3.18, 'Emergency Power Switching Logic (EPSL)

Voltage Sensing Circuits.' An SL breaker trip circuit encompasses those portions of the breaker control drcuits necessary to trip the SL breaker from the output of both 2 out of 3 logic matrices formed by each standby bus's undervoltage sensing circuits up to and Including an Individual trip coil for the associated SL breaker. The undervoltage sensing channels for the CT- 5 transformer are addressed In LCO 3.3.18, "Emergency Power Switching Logic (EPSL) Voltage Sensing Circuits." With one trip circuit Inoperable a single failure could cause an N or SL breaker to not open. This could prevent the transfer to other available sources.

Therefore, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Is allowed to repair the trip circuit or open the breaker (opening the breaker results In exiting the Condition). The Completion Time Is based on engineering Judgement taking into consideration the time required to complete the required action and the availability of the remaining trip circuit.

A Note modifies the Condition, Indicating that separate Condition Entry Is permitted for each breaker. Thus, Completion Times are tracked separately for the N1, N2, SL1, and SI.2 breaker.

OCONEE UNITS 1, 2, & 3 B 3.8.1-18 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES ACTIONS L.1, L.2, and L.3 (continued)

With an AC Source inoperable or LCO not met, as stated in Note for Condition H entry; or with an AC Source Inoperable or LCO not met, as stated in Required Action C.2.2.3 when in Condition C for > 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; or with an AC Source Inoperable or LCO not met, as stated in Required Action 1.2 or J.2 when in Conditions I or J for > 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. or with SR 3.8.1.16 not met, Required Action I1, L.2 and I.3 requires restoration within four hours. Condition L Is modified by a Note Indicating that separate Condition entry Is permitted for each Inoperable AC Source, and LCO or SR not met. The Required Action Is modified by a Note that allows theremalning OPERABLE KHU and its required emergency power path to be made Inoperable for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> If required to restore both KHUs and their required emergency power paths to OPERABLE status.

This note is necessary since certain actions such as dewatering the penstock may be necessary to restore the Inoperable KHU although these actions would also cause both KHUs to be Inoperable.

The purpose of this Required Action is to restrict the allowed outage time for an Inoperable AC Source or equipment required by an LCO when In Conditions C, H, I or J. For Conditions I and J when the LCOs stated are initially not met, the maximum Completion Time Is four hours or the remaining Completion Time allowed by the stated LCO, whichever Is shorter.

M.1 and M.2 If a Required Action and associated Completion Time for Condition C, F, G, H, I, J, K or L are not met-, or Ifa Required Action and associated Completion Time are not met for Required Action D.1 or D.3, the unit must be brought to a MODE in which the L00 does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and to MODE 5 within 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br />. The alowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.

SURVEILLANCE SR 3.8.1.1 REQUIREMENTS This SR ensures proper circuit continuity for the offsite AC electrical power supply to the onstte distribution network and availability of offslte AC electrical power. The breaker alignment verifies that each breaker Is in its correct position to ensure that distribution buses and loads are OCONEE UNITS 1, 2, & 3 B 3.8.1-19 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.1 (continued)

REQUIREMENTS connected to their power source, and that appropriate separation of offsite sources Is maintained. The 7 day Frequency is adequate since breaker poslion Is not likely to change without the operator being aware of It and because its status is displayed In the control room.

SR 3.8.1.2 This SR verifies adequate battery voltage when the KHU batteries are on float charge. This SR is performed to verify KHU battery OPERABILITY.

The Frequency of once per 7 days Is consistent with manufacturers recommendations and IEEE-450 (Ref. 8).

SR 3.8.1.3 This SR verifies the availability of the KHU associated with the underground emergency power path to start automatically and energize the underground power path. Utilization of either the auto-start or emergency start sequence assures the control function OPERABILITY by verifying proper speed control and voltage. Power path verification Is Included to demonstrate breaker OPERABILITY from the KHU onto the standby buses. This Is accomplished by closing the Keowee Feeder Breakers (SK) to energize each deenergized standby bus. The 31 day Frequency is adequate based on operating experience to provide reliability verification without excessive equipment cycling for testing.

SR 3.8.1.4 This surveillance verifies the availability of the KHU associated with the overhead emergency power path. Utilization of either the auto-start or emergency start sequence assures the control function OPERABIUTY by verifying proper speed control and voltage. The ability to supply the overhead emergency power path is satisfied by demonstrating the ability to synchronize (automatically or manually) the KHU with the grid system.

The SR also requires that the underground power path be energized after removing the KHU from the overhead emergency power path. This surveillance can be satisfied by first demonstrating the ability of the KHU associated with the underground emergency path to energize the underground path then synchronizing the KHU to the overhead emergency power path. The SR Is modified by a Note Indicating that the requirement to energize the underground emergency power path Is not OCONEE UNITS 1, 2, &3 B 3.8.1-20 Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.4 (continued)

REQUIREMENTS applicable when the overhead disconnects are open for the KHU associated with the underground emergency power path or 2) when complying with Required Action D.I. The latter exception Is necessary since Required Action D.1 continues to be applicable when both KHUs are Inoperable.

The 31 day Frequency for this Surveillance was determined to be adequate based on operating experience to provide reliability verification without excessive equipment cycling for testing.

SR 3.8.1.5 This surveillance verifies OPERABILITY of the trip functions of each dosed SL and each closed N breaker. Neither of these breakers have any automatic close functions; therefore, only the trip coils require verification. Cycling of each breaker demonstrates functional OPERABIUTY and the coil monitor circuits verify the Integrity of each trip coil. The 31 day frequency Is based on operating experience.

This SR modified by a Note that states it Is not required to be performed for an SL breaker when Its standby bus Is energized from a LCT via an Isolated power path. This is necessary since the standby buses are required to be energized from a LCT by several Required Actions of Specification 3.8.1 and the breakers must remain closed to energize the standby buses from a LCT.

SR 3.8.1.6 Infrequently used source breakers are cycled to ensure OPERABILITY.

The Standby breakers are to be cycled one breaker at a time to prevent inadvertent interconnection of two units through the standby bus breakers. Cycling the startup breakers verifies OPERABILITY of the breakers and associated Interlock circuitry between the normal and startup breakers. This circuitry provides an automatic, smooth, and safe transfer of auxiliaries In both directions between sources. The 31 day Frequency for this Surveillance was determined to be adequate based on operating experience to provide reliabiity verification without excessive equipment cycling for testing.

This SR Is modified by a Note which states the SR Is not required to be performed for an S breaker when its standby bus Is energized from a LCT via an Isolated power path. This is necessary since the standby OCONEE UNITS 1, 2. & 3 B 3.8.1-21. Amendment Nos.

Corrected by letter dated August 8, 2006

AC Sources - Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.6 (continued)

REQUIREMENTS buses are required to be energized from a LCT by several Required Actions of Specification 3.8.1 and cycling the S breakers connects the standby buses with the main feeder buses which are energized from another source.

SR 3.8.1.7 The KHU tie breakers to the underground path, ACB3 and ACB4, are Interlocked to prevent cross-connection of the KHU generators. The safety analysis utilizes two Independent power paths for accommodating single failures in applicable accidents. Connection of both generators to the underground path compromises the redundancy of the emergency power paths. Installed test logic Is used to verify a circuit to the close coil on one underground ACB does not exist with the other underground ACB closed. The 12 month Frequency for this surveillance is adequate based on operating experience to provide reliability verification without excessive equipment cycling for testing.

SR 3.8.1.8 Each KHU tie breaker to the underground emergency power path and tie breaker to the overhead emergency path, are Interlocked to prevent the unit associated with the underground circuit from automatically connecting to the overhead emergency power path. The safety analysis utilizes two Independent power paths for accommodating single failures in applicable accidents. Connection of both generators to the overhead emergency power path compromises the redundancy of the emergency power paths. Temporary test Instrumentation Is used to verify a circuit to the close coil on the overhead ACB does not exist with the Underground ACB closed. The 12 month Frequency for this Surveillance was determined to be adequate based onoperating experience to provide reliability verification without excessive equipment cycling for testing.

SR 3.8.1.9 This surveillance verifies the KHUs' response time to an Emergency Start signal (normally performed using a pushbutton in the control room) to ensure ES equipment will have adequate power for accident mitigation.

UFSAR Section 6.3.3.3 (Ref. 9) establishes the 23 second time requirement for each KHU to achieve rated frequency and voltage. Since the only available loads of adequate magnitude for simulating a accident OCONEE UNITS 1, 2, & 3 B 3.8.1-22 Amendment Nos.

Corrected by letter dated August 8, 2006