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Proposed Tech Specs,Clarifying in Revised Bases of 3/4 Chapter 8,that Alignment of Standby Auxiliary Transformer Intended to Be Temporary Alignment & Will Be Utilized When Normal Preferred Offsite Power Source,Rat Unavailable
	ML20085G717
Person / Time
Site:	Vogtle
Issue date:	06/14/1995
From:	; GEORGIA POWER CO.
To:	;
Shared Package
ML20085G705	List: ML20085G702; ML20085G717;
References
	NUDOCS 9506200334
	Download: ML20085G717 (8)
	v • d • e

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. 3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES' OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. electrical power; rces shall be 3 OPERABLE:

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a. Two physically independent circuits etw en the offsite transmission network and the onsite Class IE Distribution System, each with an automatic load sequencer, and

b. Two separate and independent diesel generators, each with:

1) A day tank containing a minimum volume of 650 gallons of fuel (52% of instrument span) (LI-9018, LI-9019),

2) A separate Fuel Storage System containing a minimum volume of-

' 68,000 gallons of fuel (76% of instrument span) (LI-9024, LI-9025), ,

3) A separate fuel transfer pump, and -_

4) An automatic load sequencer.

4 APPLICABILITY: MODES 1 d4 es6 abC O ** IGf'

With onekeffs4t h; ;7 p;

..;;; ir.;;;r d'; due to other than an inoperable automatic load sequencer, demonstrate the OPERABILITY of.the remaininge.C.

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by performing Surveillance Requirement.4.8.1.1.1.a within '

I hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. Restore offsite g circuit to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at 'le @ast HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the E following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . ;;i

b. With either diesel generator inoperable due to other than an inoperable automatic' load sequencer, demonstrate the 0PERABILITY of g I

C.N .N the above reauired A.C. offsite-r ece: by performing Surveillance o /f A Requirement 4.8.1.1.1.a within l' hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .i g . ,o thereafter. If the diesel generator became inoperable due to any 3L 0 cause other than an inoperable support system, an independently N testable component, or preplanned preventive maintenance or testing,, 3 ' L 9.

demonstrate the OPERABILITY of the remaining OPERABLE diesel gener-ator by performing Surveillance Requirements 4.8.1.1.2.g.1 and P 'f:

4.8.1.1.2.a.5 within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months *#, unless the. absence of any potential 9.

common mode failure for the remaining diesel generator is demonstrated. Restore the inoperable diesel generator to OPERABLE 3 s: .

status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least HOT STANDBY within the next - '

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

This test is required to be completed regardless of when the inoperable diesel generator is restored to OPERABILITY.

The diesel shall not be rendered inoperable by activities performed to support testing pursuant to the ACTION Statement (e.g., an air roll).

V0GTLE UNITS - 1 & 2 3/4 8-1 Amendment No. 86 (Unit 1)

~ Amendment No. 64 (Unit 2) 9506200334 950614 PDR ADOCK 05000424 p P . .PDR

ELECTRIC,'/_ POWER SYSTEMS U g g ,i CONDITION FOR OPERATION

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ACTION (Continued) _g gnl one A.6. owe cM+ OPERABLE

c. 'With ::: Off:.t: :ir a it and one diesel generator of the above required ~

A.C. electrical' power sources inoperable due to other than an-inoperable automatic load sequencer, demonstrate the 0PERABILITY of the remaining n.C. Off;it: :: r n by performing Surveillance Require-

4. -p ment 4.8.1.1.1.a within I hour and at least once-per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months p

4-thereafter, and, if the diesel generator became inoperable' due to any S cause other than are inoperable support system, an independently 1

testable component, or preplanned preventative maintenance or testing,

( demonstrate the OPERABILITY of the remaining OPERABLE diesel generator by erforming Surveillance Requirements 4.8.1.1.2.g.1:and 4.8.1.1.2.a.5 -

3> l h I ~ wit in 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months *, unless the OPERABLE diesel generator is already. opera remainin ener tor is-demonstrated. Restore at least on

' o 4 (hj;;;;rd':Jou _ to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or'be in at 1 east HOT STANDB wi n the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUT 00WN within j: @E the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Restore the other 'A.C. power source (pffsite

D circuit or diesel generator) to OPERABLE status.in accordance With the _

o provisions.of 3.8.1.1, ACTION Statement a or b, as appropriate, with.

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, the time requirement of that ACTION Statement based on the time of 7 L initial loss of the remaining inoperable A.C. power source. A.

yI successful test of diesel generator 0PERABILITY per. Surveillance . .

Requirements 4.8.1.1.2.g.1-and 4.8.1.1.2.a.5 performed under the ACTION O

' Statement for an OPERABLE diesel generator or a restored to_0PERABLE diesel generator satisfies the diesel generator test requirement of 33 ACTION Statement b.

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d. With one diesel generator inoperable in addition to ACTION b. or c.

above, . veriff that: h

1. All reqdired systems, subsystems, trains, components, and devices that depend on the remaining OPERABLE diesel generator as a source of emergency power are also OPERABLE, and

2. When in MODE 1, 2, or 3, the steam-driven auxiliary feedwater pump is OPERABLE.

1 If these conditions are not satisfied within 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months s- be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the -

following 30. hours.

4 H e. WithM of t,he above required offsite A.C. circuits '..:;;rd.:,

restore at least one ':f th: i=;;rd':--offsite'-soupeeego OPERA 8LE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .or be in at least HOT STANDBY;within the riext 6 '

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hours. Following restoration of one offsite g=rn, follow ACTION-Statement a with the time requirement of that ACT ON t , t based-h>-

A. . circe ht

This test is required'to be completed regardless of when e_ no ab e EDG is - '

restored to OPERABILITY. .

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The diesel shall not be rendered inoperable by activities performed to support E testing pursuant to the ACTION Statement (e.g., an air roll).

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V0GTLE UNITS - 1 & 2- 3/4-8-2 Amendment No. 86-Amendment No. 64 (Unit' 1 (Unit-2).

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ELECTRICAL' POWER SYSTEMS

LIMITING CONDITION FOR OPERATI'N O ACTION (Continued) .

MOC0 on _the time of the initial loss of theNxining i=p:dh offsite a.c. circuit.

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f. With two of the 'above required diesel generators inoperable, demon- l

, strate the OPERABILITY of two-offsite A.C. circuits ~by performing the

, requirements of Specification.4.8.1.1.1.a. within'I hour and at least once pet 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore at least one of the inoperable diesel generators to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STAND 8Y within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the-following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Following restoration of one diesel generator.

unit, follow ACTION Statement b with the time requirement of that ACTION Statement based;on the time of initial loss of the remaining .

inoperable diesel generator.' - A successfu1~ test of diesel OPERABILITY ,

per Surveillance Requirements 4.8.1.1.2.g.1 and 4.8.1.1.2.a.5 performed l under this ACTION' Statement for_ a restored to OPERABLE diesel satisfies the diesel generator test requirements of ACTION Statement b.

g. With less than the above minimum required A.C. electrical _ power sources.

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OPERABLE due to an inoperable automatic load ' sequencer, restore the -

inoperable automatic load sequencer to OPERABLE status within 12. hours ;

or be. in at least HOT STANDBY within~ the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in I

, SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ., l lwe SURVEILLANCE REQUIREMENTS l /

4.8.1.1.1 Each of the'above required independent circuits etween the offsite transmission network and the Onsite Class IE Distribution System shall be:

a. Determined OPERABLE at least once per 7 days by verifying correct T

breaker alignments, and indicated power availability.

4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE:

a. In accordance with the frequency specified in Table 4.8-1 on a-STAGGERED TEST BASIS by: l

1) Verifying the- fuel level in the day tank (LI-9018, LI-9019),

2) Verifying the fuel level in the fuel storage tank (LI-9024, LI-

. 9025),

3) Verifying the fuel transfer pump starts and transfers fuel from the storage system to the day tank,

4) Verifying the diesel starts

and accelerates to at least 440 RPM with generator voltage and frequency at 4160 + 170, -135 volts and 60 1.2 Hz. The diesel generator shall be started for this test by. using one of the following signals:

All diesel generator starts for the purpose of surveillance testing as' required a- by Specification 4_.8.1.1.2 may be preceded by an engine prelube period as recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized.

V0GTLE UNITS - 1 & 2 3/4 8-3 Amendment No. 86 (Unit 1)

Amendment No. 64 (Unit 2)

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j ELECTRICAL POWER SYSTEMS A.C. SOURCES-SHUTDOWN LIMITING CONDITION FOR OPERATION l

l 3.8.1.2 ~As a minimum, the follming A.C. electrical power sources shall be OPERABLE:

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a. One circut twesn the offsite transmission network and the Onsite Class 1E Distribution System, including the loss of power and undervoltage function of the associated automatic load sequencer, and

b. One diesel generator with:

1) A day tank containing a. minimum volume of 650 gallons (52% of

instrument span) (LI-9018, LI-9019) of fuel, -

2) .A fuel storage system containing a minimum volume of 68,000 gallons.

of fuel--(76% of instrument span) (LI-9024,-LI-9025),.

3) A fuel transfer pump, and

4)~ The loss of power and undervoltage function of the associated

automatic load sequencer.

APPLICABILQ1: MODES 5 and 6.

ACIl0N:

With less than the above minimum required A.C. electrical power sources OPERABLE, immediately suspend all operations involving CORE ALTERATIONS, positive reactivity changes, movement of irradiated fuel, or crane operation with loads over the fuel storage pool, and provide relief capability for the Reactor Coolant System in accordar.ce with Specification 3.4.9.3. In addition, when in MODE 5 with the reactor coolant loops not filled, or.in MODE 6 with the l water level less than 23 feet above the reactor vessel flange, immediately ;

! initiate corrective action to restore the required sources to OPERABLE status l as soon as possible. 1 1

SURVEILLANCE REQUIREMENTS 4.8.1.2.1.The above required A.C. electrical power sources shall be l~,

demonstrated OPERABLE by the performance.of each of the requirements of

Specifications '4.8.1.I'.1, 4.8.1.1.2 (except for Specification 4.8.1.1.2.h, i, and j), and 4.8.1.1.3. i

, 4.8.1.2.2 At least once per 18 months during shutdown, verify the loss of power and undervoltage function of the associated automatic load sequencer OPERABILITY upon LOSP signal by verifying deenergization of the emergency bus, load shedding of the operating loads from the emergency bus, and verifying the diesel starts and energizes the emergency bus- with the available auto-connected shutdown loads.

V0GTLE UNITS - 1 & 2 3/4 8-10 Amendment No. 86 (Unit 1)

Amendment No. 64' (Unit 2)

3/4.8.3 ONSITE POWER DISTRIBUTION N s OPERATING LIMITING CONDITION FOR OPERATION s

' 3.8.3.1 The following electrical busses shall be energized in the specified manner with tie breakers open between redundant busses within the unit:

a. A.C. Emergency Busses consisting of:- - -

1. Train A a) 4160 volt switchgear 1/2AA0 b) 480 volt switchgear 1/2A804

' 1) MCC 1/2ABE c) 480 volt switchgear 1/2AB05

1) MCC 1/2ABA

2) MCC 1/2ABC

3) MCC 1/2ABF d) 480 volt switchgear 1/2AB15

1) MCC 1/2ABB

2) MCC 1/2ABD

2. Train 8 y a) 4160 volt switchgear 1/28A03 b) 480 volt switchgear 1/28806

1) MCC 1/2BBE c) 480 volt switchgear 1/28807

1) MCC 1/2BBA

2) MCC 1/2CBC

3) MCC L'2BBF d) 480 volt switchgear 1/28816

1) MCC 1/2BBB

2) MCC 1/2BB0

b. 120 volt A.C. vital Busses

1. Associated with Train A a) Channel I

1) Panel 1/2AY1A energized from inverter 1/2AD1Il connected to switchgear 1/2AD1*

2) Panel 1/2AY2A energized from inverter 1/2AD1111 connected to switchgear 1/2ADi*

b) Channel III

1) Panel 1/2CY1A energized from inverter 1/2001I3 connected to switchgear 1/2001*

2. Associated with Train B a) Channel II

1) Panel 1/2BY1B energized from inverter 1/2B01I2 connected to switchgear 1/2B01*

Two inverters in a single train may be disconnected from their associated switchgear for up to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months as necessary, for the purpose of performing an equalizing charge on their associated battery bank provided: (1) their associated panels are energized from their regulated transformers, and (2) the panels associated with the other battery bank powered from that AC train are energized in the specified manner.

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osed'fo note addition.

V0GTLEUIITS-1&2 9 /4 8-15

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l Proposed Footnote Addition to !

! TS Section 3.8.3.1, page 3/4 8-15.

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) The redundant emergency busses of 4160 volt switchgear 1/2AA02 and 1/2BA03 may be' manually connected within the unit by tie breakers in order to allow transfer of preferred offsite power sources provided surveillance l- requirements of 4.8.1.1.1(a) are successfully performed j within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months prior to the interconnection. ,

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3/4.8 ELECTRICAL POWER SYSTEMS BASES 6

3/4.8.1. 3/4.8.2. and 3/4.8.3 A.C. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION I The OPERASILITY of the A.C. and D.C power sources and' associated 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 mitigation 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 General sign Criterion 17 of Appendix A to 10 CFR Part 50.

, The ACTION requirements specified for the levels of degradation ~of the power sources provide restriction upon continued facility operation-commensurate with the level of degradation. The OPERABILITY of the power i sources are consistent.with the initial condition assumptions of the safety 4 -

analyses and are based'upon maintaining at,least one redundant set of onsite 1 A.C. and D.C. power sources and associated distribution systems OPERABLE during_

N accident conditions coincident with an assumed loss-of-offsite power and single i

U 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 and Appendix A to Generic Letter 84-4 15, " Proposed Staff Position to Improve and Naintain Diesel Generator

' Reliability." When one diesel generator is inoperable, there.is an additional

]g ACTION requirement to verify that all required systems, subsystems, trains, components and devices, that depend.on the remaining OPERABLE diesel generator

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as a source of emergency power, are also OPERABLE, and that the steam-driven auxiliary feedwater pump-is OPERABLE. This requirement is intended to provide j assurance that a loss-of-offsite power event will not result in a complete loss of safety function of critical systems during the period one of the diesel generators is inoperable. The term, verify, as used in this context means to-

administrative 1y check 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

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the OPERABILITY of the component.

The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that:

(1)_the facility can be maintained in the shutdown or refueling condition for extended time periods, and (2) sufficient instrumentation and control capa-3 bility is available for monitoring and maintaining the unit status.

1 The ACTION times specified for an inoperable automatic load sequencer are based on the times allowed when a combination of one diesel generator and one offsite circuit is-inoperable. Under this condition the 4.16 kV Class 1E bus

, would remain energized. The ACTION conservatively addresses any consequential

effects of an inoperable load sequencer on other engineered safety features.

V0GTLE UNITS - 1 & 2 B 3/4 8-1 Amendment No. 86 (Unit 1)-

Amendment No. 64 (Unit 2)

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l Revised Insert to Bases 3/4.8 Electrical Power Systems l Normally, the two required offsite power source circuits are connected to the onsite Class 1E Distribution System through their respective reserve auxiliary transformers, (RATS).

These transformers are utilized as the final point of transmission grid voltage reduction to the onsite Class 1E electrical distribution system. When a RAT is unavailable, the standby i auxiliary transformer (an additional 10 CFR 50 Appendix A, GDC 17 power source) may )

be placed into service and connected to the onsite Class IE Distribution System, in order to meet the TS requirements as an OPERABLE A.C. electrical offsite power circuit.

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ML20085G717

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