ML14071A152

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Slide, ITS Project Electrical Systems Presentation March 13, 2014
ML14071A152
Person / Time
Site: Sequoyah  
Issue date: 03/13/2014
From:
Tennessee Valley Authority
To: Lisa Regner
Plant Licensing Branch II
Regner L
References
Download: ML14071A152 (30)
v • d • e


Text

Nuclear SequoyahNuclearPlant (SQN)

Nuclear (SQN)

ITS P j

ITSProject ElectricalSystemsPresentation y

March13,2014

Agenda Nuclear 3/4 Purpose of Proposed Changes Nuclear p

p g

3/4 Shutdown Board Maintenance 3/4 SQN Electrical Design g

3/4 Current Technical Specifications (CTS) 3/4 Improved Technical Specifications (ITS) p p

(

)

3/4 ITS Example 3/4 Summary

Purpose of Proposed Changes Nuclear

  • Relax overly restrictive CTS electrical Nuclear requirements for systems shared between units
  • Facilitate Shutdown Board maintenance without requiring a dual unit outage q

g g

Shutdown Board Maintenance Nuclear

  • Periodic preventive maintenance is Nuclear required for electrical boards
  • Shutdown Boards are shared between Unit 1 and Unit 2
  • CTS require a dual unit outage to allow enough time to complete Shutdown Board maintenance
  • Current Shutdown Board preventive maintenance has been deferred

Shutdown Board Maintenance Nuclear Changes Needed to Allow Shutdown Nuclear g

Board Maintenance Without a Dual Unit Outage g

  • License amendment to allow one ERCW Pump per train Pump per train
  • Plant modification to the auxiliary control air system air system
  • ITS implemented

SQN Electrical Design Nuclear

  • The following slides show the SQN f

Nuclear electrical system from the switchyard to the onsite Class 1E distribution system

  • There are two load groups, each load group is powered from two 6.9 kV shutdown boards

- Load Group A (1A-A and 2A-A) p

(

)

- Load Group B (1B-B and 2B-B)

SQN Electrical Design - Normal Alignment Nuclear NC PCBs (2) 161 kV Switchyard (2 busses) 500 kV Switchyard (2 busses)

Unit 2 NC PCBs (2)

Unit 1 GCB GCB Main 2 CSST B (Spare)

CSST A LTC LTC LTC LTC LTC LTC Main 1 CSST C LTC USST 2B LTC USST 2A LTC USST 1B LTC USST 1A NC NC NC NC NO NO NO NO NC NC NC NC NO NO NO NO Start Bus 1A Start Bus 1B Start Bus 2A St t B 2B Start Bus 2B 6 9 kV Unit Bd 2C 6 9 kV Unit Bd 2B NC NO NC NO 6 9 kV Unit Bd 1C 6 9 kV Unit Bd 1B NO NC NC NO (6.9 kV Unit Bds 2A d 2C t

h

)

(6.9 kV Unit Bds 1A d 1C t

h

)

6.9 kV Unit Bd 2C 6.9 kV Unit Bd 2B DG 2B-B DG 2A-A 6.9 kV Shutdown Bd. 2A-A 6.9 kV Shutdown Bd. 2B-B 6.9 kV Unit Bd 1C 6.9 kV Unit Bd 1B DG 1B-B DG 1A-A 6.9 kV Shutdown Bd. 1A-A 6.9 kV Shutdown Bd. 1B-B and 2C are not shown) and 1C are not shown)

Safety Related Power Distribution System - Normal Alignment, Both Units in Operation Nuclear DG 2B-B DG 2A-A DG 1B-B DG 1A-A Normal Supply Normal Supply Normal Supply Normal Supply Nuclear 6.9 kV 6.9 kV 6.9 kV 6.9 kV NO NC Normal Supply From 2C Unit Bd.

NO NC Normal Supply From 2B Unit Bd.

NO NC Normal Supply From 1C Unit Bd.

NO NC Normal Supply From 1B Unit Bd.

Shutdown Bd. 2A-A Shutdown Bd. 2B-B Shutdown Bd. 1A-A Shutdown Bd. 1B-B ERCW**

U2 B ESF Loads*

480 V Loads ERCW**

480 V Loads U1 B ESF Loads*

ERCW**

480 V Loads U2 A ESF Loads*

ERCW**

480 V Loads U1 A ESF Loads*

480 V Loads Air Return Fan 2B-B CCS Pump 2B-B CCS Pump C-S**

ABGTS Fan B-B**

Aux Control Air Compressor B-B**

125 V Vit l B tt Ch IV**

480 V Loads Air Return Fan 1B-B CCS Pump 1B-B EGTS Fan B-B**

CR AHU B-B**

125 V Vital Batt Chrgr II**

120 V Vit l I t

1 II 2 II**

480 V Loads Air Return Fan 2A-A CCS Pump 2A-A ABGTS Fan A-A**

Aux Control Air Compressor A-A**

125 V Vital Batt Chrgr III**

120 V Vit l I t

1 III 2 III**

480 V Loads Air Return Fan 1A-A CCS Pump 1A-A EGTS Fan A-A**

CR AHU A-A**

125 V Vital Batt Chrgr I**

120 V Vit l I t

1 I 2 I**

125 V Vital Batt Chrgr IV**

120 V Vital Inverters 1-IV, 2-IV**

120 V Vital Inverters 1-II, 2-II**

120 V Vital Inverters 1-III, 2-III**

120 V Vital Inverters 1-I, 2-I**

    • Shared System

Current Technical Specifications Nuclear LCO 3.8.1.1 As a minimum, the following AC electrical Nuclear LCO 3.8.1.1 As a minimum, the following AC electrical power sources shall be OPERABLE:

a.

Two physically independent circuits between the offsite transmission network and the onsite Class 1E distribution system, and b.

Four separate and independent diesel generators (DGs)...

APPLICABILITY: MODES 1, 2, 3, and 4.

Current Technical Specifications Nuclear ACTION:

Nuclear

a. With one offsite circuit inoperable restore offsite circuit within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

b With DGs 1A-A and/or 2A-A or 1B-B and/or 2B-B inoperable

b. With DGs 1A A and/or 2A A or 1B B and/or 2B B inoperable restore DGs within 7 days.
c. With one offsite circuit and one DG inoperable restore one of 12 the inoperable sources within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
d. With two offsite circuits inoperable restore one offsite source within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

e. With either DGs 1A-A and/or 2A-A inoperable simultaneously with 1B-B and/or 2B-B inoperable, restore either: 1) 1A-A and 2A A
2) 1B B d 2B B ithi 2 h 2A-A, or 2) 1B-B and 2B-B... within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Current Technical Specifications Nuclear LCO 3.8.2.1 The following AC electrical boards shall be OPERABLE and energized with tie breakers open between redundant boards:

Nuclear energized with tie breakers open between redundant boards:

6900 Volt Shutdown Boards 1A-A & 1B-B 6900 Volt Shutdown Boards 2A-A & 2B-B 480 Volt Shutdown Boards 1A1-A, 1A2-A, 1B1-B, & 1B2-B 480 Volt Shutdown Boards 2A1-A, 2A2-A, 2B1-B, & 2B2-B 120 Volt A.C. Vital Instrument Power Board Channels 1-I and 2-I energized from inverters 1-I and 2-I 120 Volt A C Vital Instrument Power Board Channels 1 II and 2 II 120 Volt A.C. Vital Instrument Power Board Channels 1-II and 2-II energized from inverters 1-II and 2-II 120 Volt A.C. Vital Instrument Power Board Channels 1-III and 2-III energized from inverters 1-III and 2-III 120 Volt A.C. Vital Instrument Power Board Channels 1-IV and 2-IV energized from inverters 1-IV and 2-IV APPLICABILITY: MODES 1, 2, 3, and 4.

Current Technical Specifications Nuclear ACTION:

Nuclear

a. With less than the above compliment of AC boards OPERABLE and energized, restore the inoperable boards to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />...

Current Technical Specifications Nuclear OPERABLE - OPERABILITY Nuclear A system, subsystem, train, or component or device shall be OPERABLE or have OPERABILITY when it is capable of performing its specified function(s) and when all necessary performing its specified function(s), and when all necessary attendant instrumentation, controls, a normal and {emphasis added} an emergency electrical power source, cooling or seal water lubrication or other auxiliary equipment that are required water, lubrication or other auxiliary equipment that are required for the system, subsystem, train, component or device to perform its function(s) are also capable of performing their related support f

ti

( )

function(s).

Current Technical Specifications Nuclear LCO 3.0.5 When a system subsystem train component or device is determined to be Nuclear When a system, subsystem, train, component or device is determined to be inoperable solely because its emergency power source is inoperable, or solely because its normal power source is inoperable, it may be considered OPERABLE for the purpose of satisfying the requirements of its applicable p

p y g q

pp Limiting Condition for Operation, provided: (1) its corresponding normal or emergency power source is OPERABLE; and (2) all of its redundant system(s),

subsystem(s), train(s), component(s) and device(s) are OPERABLE, or likewise satisfy the requirements of this Specification Unless both conditions (1) and (2) satisfy the requirements of this Specification. Unless both conditions (1) and (2) are satisfied, within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> action shall be initiated to place the unit in a MODE in which the applicable Limiting Condition for Operation does not apply by placing it as applicable in:

1. 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 />,
2. At least HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and 3 At least COLD SHUTDOWN within the subsequent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
3. At least COLD SHUTDOWN within the subsequent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

This Specification is not applicable in MODES 5 or 6.

Improved Technical Specifications Nuclear LCO 3.8.1 The following AC electrical sources shall be Nuclear g

OPERABLE:

a.

Two qualified circuits between the offsite t

i i

t k

d th it Cl 1E transmission network and the onsite Class 1E AC Electrical Power Distribution System; and b.

Four diesel generators (DGs) capable of supplying the onsite Class 1E AC Electrical Power Distribution System.

APPLICABILITY: MODES 1 2 3 and 4 APPLICABILITY: MODES 1, 2, 3, and 4.

Improved Technical Specifications Nuclear Highlighted portions of ITS Action A reflect CTS CONDITION REQUIRED ACTION COMPLETION TIME Nuclear Action a requirements for the restoration of an inoperable offsite circuit, with the exception that A. One offsite circuit inoperable for reasons other than Condition C.

A.1 Perform SR 3.8.1.1 for OPERABLE offsite circuit.

1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> AND Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter inoperable offsite power sources to Shutdown Board 2A-A or 2B-B are addressed in Condition C.

AND A.2 Declare required feature(s) with no offsite power available inoperable when thereafter 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from discovery of no offsite power to 6.9 kV its redundant required feature(s) is inoperable.

Shutdown Board 1A-A or 1B-B concurrent with inoperability of redundant required feature(s)

AND A.3 Restore offsite circuit to OPERABLE status.

72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />

Improved Technical Specifications Nuclear Highlighted portions of ITS Action B reflect CTS Action b requirements for CONDITION REQUIRED ACTION COMPLETION TIME B. DG 1A-A inoperable.

B.1 Perform SR 3.8.1.1 for the offsite circuits 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Nuclear the restoration of inoperable DG(s), with the exception that inoperable DGs on Sh d

B d 2A A OR DG 1B-B inoperable.

OR offsite circuits.

AND AND Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter Shutdown Boards 2A-A and 2B-B are addressed in Condition D.

DGs 1A-A and 2A-A inoperable.

OR DGs 1B-B and 2B-B inoperable B.2 Declare required feature(s) supported by the inoperable DG inoperable when its required redundant feature(s) is inoperable.

4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> from discovery of Condition B concurrent with inoperability of redundant required inoperable.

AND B.3.1 Determine OPERABLE DGs are not inoperable due redundant required feature(s) 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to common cause failure.

OR B.3.2 Perform SR 3.8.1.2 for OPERABLE DGs.

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> AND B.4 Restore DG(s) to OPERABLE status.

7 days

Improved Technical Specifications Nuclear Highlighted portions of ITS Action E reflect CTS Action d requirements for CONDITION REQUIRED ACTION COMPLETION TIME E

Two offsite circuits E 1 Declare required feature(s) 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> from Nuclear Action d requirements for the restoration of an inoperable offsite circuit.

E. Two offsite circuits inoperable.

E.1 Declare required feature(s) inoperable when its redundant required feature(s) is inoperable.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> from discovery of Condition E concurrent with inoperability of redundant required features AND E.2 Restore one offsite circuit to OPERABLE status.

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />

Improved Technical Specifications Nuclear Highlighted portions of ITS Action F reflect CTS Action c requirements for CONDITION REQUIRED ACTION COMPLETION TIME F

One offsite circuit NOTE Nuclear Action c requirements for the restoration of either an inoperable offsite power source or a DG, with the exception that F. One offsite circuit inoperable for reasons other than Condition C.

AND DG 1A-A or 1B-B

NOTE-------------------

Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems - Operating,"

when Condition F is entered with no AC power source to 6.9 kV Shutdown Board 1A-A or 1B-B.

with the exception that combinations involving inoperable offsite power sources and/or DGs to Shutdown Board 2A-A or inoperable.

F.1 Restore offsite circuit to OPERABLE status.

OR 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Shutdown Board 2A-A or 2B-B are addressed in Conditions G, H or I.

F.2 Restore DG to OPERABLE status.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />

Improved Technical Specifications Nuclear Highlighted portions of ITS Action J reflect CTS CONDITION REQUIRED ACTION COMPLETION TIME Nuclear Action e requirements for the restoration of one train of inoperable DGs.

J. One or more Train A DG(s) inoperable.

AND One or more Train B J.1 Restore one train of DGs to OPERABLE status.

2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> DG(s) inoperable.

Improved Technical Specifications Nuclear ITS Action C contains Required Actions for an CONDITION REQUIRED ACTION COMPLETION TIME Nuclear Required Actions for an inoperable offsite power source to Shutdown Board 2A-A or 2B-B.

C. One offsite circuit inoperable solely due to an offsite power source to 6.9 kV Shutdown Board 2A-A or 2B-B inoperable C.1 Perform SR 3.8.1.1 for OPERABLE offsite circuit.

1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> AND Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter Requires declaring required features with no offsite power available inoperable 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from inoperable.

AND C.2 Declare required feature(s) with no offsite power available inoperable when thereafter 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from discovery of no offsite power to 6.9 kV inoperable 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from discovery of concurrent inoperable redundant feature, or 7 days from time offsite power source its redundant required feature(s) is inoperable.

AND Shutdown Board 2A-A or 2B-B concurrent with inoperability of redundant required feature(s) time offsite power source declared inoperable.

AND C.3 Declare associated required feature(s) inoperable.

7 days

Improved Technical Specifications Nuclear ITS Action D contains Required Actions for an inoperable DG to CONDITION REQUIRED ACTION COMPLETION TIME D. DG 2A-A or 2B-B inoperable D.1 Perform SR 3.8.1.1 for OPERABLE offsite 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Shutdown Board 2A-A or 2B-B.

Requires declaring i

d f inoperable.

OPERABLE offsite circuit(s).

AND AND Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter required features supported by the inoperable DG inoperable 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> from discovery of t i bl D.2 Declare required feature(s) supported by the inoperable DG inoperable when its redundant required feature(s) is inoperable.

4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> from discovery of Condition D concurrent with inoperability of redundant required concurrent inoperable redundant features, or 7 days from time DG declared inoperable.

AND D.3.1 Determine OPERABLE DGs are not inoperable due t

f il redundant required feature(s) 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to common cause failure.

OR D.3.2 Perform SR 3.8.1.2 for OPERABLE DGs.

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> AND D.4 Declare associated required feature(s) inoperable.

7 days

Improved Technical Specifications Nuclear ITS Action G contains requirements related to a combination of an CONDITION REQUIRED ACTION COMPLETION TIME G

One offsite circuit G 1 Declare required feature(s) 7 days Nuclear combination of an inoperable offsite power source to Shutdown Board 2A-A or 2B-B with an inoperable Unit 1 DG G. One offsite circuit inoperable solely due to an offsite power source to 6.9 kV Shutdown Board 2A-A or 2B-B inoperable.

G.1 Declare required feature(s) on associated Unit 2 6.9 kV Shutdown Board inoperable.

7 days an inoperable Unit 1 DG.

Required Action for declaring required features supported by the AND DG 1A-A or 1B-B inoperable.

features supported by the inoperable DG or offsite circuit inoperable with concurrent inoperable redundant features are redundant features are addressed in ACTIONS A, B, C, and D, as applicable.

Improved Technical Specifications Nuclear ITS Action H contains requirements related to a bi ti f

CONDITION REQUIRED ACTION COMPLETION TIME Nuclear combination of an inoperable offsite power source to Shutdown Board 1A-A or 1B-B with i

bl U it 2 DG H. One offsite circuit inoperable for reasons other than Condition C.

AND DG 2A A or 2B B H.1 Declare required feature(s) on associated Unit 2 6.9 kV Shutdown Board inoperable.

7 days an inoperable Unit 2 DG.

Required Action for declaring required f

t t d b th DG 2A-A or 2B-B inoperable.

features supported by the inoperable DG or offsite circuit inoperable with concurrent inoperable d

d t f t

redundant features are addressed in ACTIONS A, B, C, and D, as applicable.

Improved Technical Specifications Nuclear ITS Action I contains requirements related to a combination of an inoperable CONDITION REQUIRED ACTION COMPLETION TIME Nuclear combination of an inoperable offsite power source and DG to Shutdown Board 2A-A or 2B-B.

R i

d A ti f

d l

i I.

One offsite circuit inoperable solely due to an offsite power source to 6.9 kV Shutdown Board 2A-A or 2B-B inoperable.

NOTE-------------------

Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems - Operating,"

when Condition I is entered with no AC power source to 6.9 kV Sh td B

d 2A A 2B B Required Actions for declaring required feature(s) supported by the inoperable DG or offsite circuit inoperable with concurrent inoperable AND DG 2A-A or 2B-B inoperable.

Shutdown Board 2A-A or 2B-B.

I.1 Restore offsite circuit to OPERABLE status.

OR 7 days p

redundant feature(s) are addressed in ACTIONS A, B, C, and D, as applicable.

Note requires entering I.2 Restore DG to OPERABLE status.

7 days Note requires entering Conditions and Required Actions of LCO 3.8.9 when 6.9 kV Shutdown Board 2A-A or 2B-B is de-energized.

Improved Technical Specifications Nuclear LCO 3 8 9 T

i A d T i

B AC i

l DC AC i l

d Nuclear LCO 3.8.9 Train A and Train B AC, vital DC, AC vital, and diesel generator (DG) DC electrical power distribution subsystems shall be OPERABLE.

y APPLICABILITY: MODES 1, 2, 3, and 4.

Improved Technical Specifications Nuclear CONDITION REQUIRED ACTION COMPLETION TIME Nuclear A. One or more Unit 1 AC electrical power distribution subsystems inoperable.

A.1

NOTE--------------

Enter applicable Conditions and Required Actions of LCO 3.8.4, "DC Sources -

Operating," for vital DC trains made inoperable by inoperable power distribution subsystems.

Restore Unit 1 AC electrical power distribution subsystem(s) to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> y

( )

OPERABLE status.

B. One or more AC vital subsystems inoperable.

B.1 Restore AC vital subsystem(s) to OPERABLE status.

8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> C. One vital DC electrical power distribution subsystem inoperable.

C.1 Restore vital DC electrical power distribution subsystem to OPERABLE status.

2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> D

O U it 2 AC D 1 D

l i t d I

di t l D. One or more Unit 2 AC electrical power distribution subsystems inoperable.

D.1 Declare associated required feature(s) inoperable.

Immediately

ITS Example - Shutdown Board 2B-B De-Energized; Unit 1 in Mode 1-4 (Unit 2 in Mode 5 or 6)

Nuclear DG 2B-B DG 2A-A DG 1B-B DG 1A-A Normal Supply Normal Supply Normal Supply Normal Supply Nuclear 6.9 kV 6.9 kV 6.9 kV 6.9 kV NO NC Normal Supply From 2C Unit Bd.

NO NC Normal Supply From 2B Unit Bd.

NO NC Normal Supply From 1C Unit Bd.

NO NC Normal Supply From 1B Unit Bd.

Shutdown Bd. 2A-A Shutdown Bd. 2B-B Shutdown Bd. 1A-A Shutdown Bd. 1B-B ERCW U2 B ESF Loads 480 V Loads ERCW 480 V Loads U1 B ESF Loads ERCW 480 V Loads U2 A ESF Loads ERCW 480 V Loads U1 A ESF Loads Need LAR approved 480 V Loads Air Return Fan 2B-B Not needed for Unit 1 CCS Pump 2B-B Not needed for Unit 1 CCS Pump C-S**

N t d d f U it 1 CCS 480 V Loads Air Return Fan 1B-B CCS Pump 1B-B EGTS Fan B-B**

CR AHU B-B**

125 V Vital Batt Chrgr II**

120 V Vital Inverters 1-II, 2-II**

480 V Loads Air Return Fan 2A-A CCS Pump 2A-A ABGTS Fan A-A**

Aux Control Air Compressor A-A**

125 V Vital Batt Chrgr III**

120 V Vital Inverters 1-III, 2-III**

480 V Loads Air Return Fan 1A-A CCS Pump 1A-A EGTS Fan A-A**

CR AHU A-A**

125 V Vital Batt Chrgr I**

120 V Vital Inverters 1-I, 2-I**

Not needed for Unit 1, CCS Pump 1B-B will satisfy B Train ABGTS Fan B-B**

Enter LCO 3.7.12 Condition A (7 days)

Aux Control Air Compressor B-B**

Need Mod completed 125 V Vital Batt Chrgr IV**

120 V Vital Inverters 1 II, 2 II 120 V Vital Inverters 1 III, 2 III 120 V Vital Inverters 1 I, 2 I 125 V Vital Batt Chrgr IV Enter LCO 3.8.4 Condition A (7 days) 120 V Vital Inverters 1-IV, 2-IV**

Inverters operable with power input from the 125 VDC Vital Batteries

    • Shared System

ITS Example - Shutdown Board 2B-B De-Energized; Unit 2 in Mode 5 or 6 Nuclear DG 2B-B DG 2A-A DG 1B-B DG 1A-A Normal Supply Normal Supply Normal Supply Normal Supply Nuclear 6.9 kV 6.9 kV 6.9 kV 6.9 kV NO NC Normal Supply From 2C Unit Bd.

NO NC Normal Supply From 2B Unit Bd.

NO NC Normal Supply From 1C Unit Bd.

NO NC Normal Supply From 1B Unit Bd.

Shutdown Bd. 2A-A Shutdown Bd. 2B-B Shutdown Bd. 1A-A Shutdown Bd. 1B-B ERCW U2 B ESF Loads ERCW 480 V Loads U1 B ESF Loads ERCW 480 V Loads U2 A ESF Loads ERCW 480 V Loads U1 A ESF Loads Not needed for Unit 2 Not needed for Unit 2 480 V Loads Air Return Fan 2B-B Not needed for Unit 2 CCS Pump 2B-B Not needed for Unit 2 480 V Loads Air Return Fan 1B-B CCS Pump 1B-B EGTS Fan B-B CR AHU B-B 125 V Vital Batt Chrgr II 120 V Vital Inverters 1-II, 2-II 480 V Loads Air Return Fan 2A-A CCS Pump 2A-A ABGTS Fan A-A Aux Control Air Compressor A-A 125 V Vital Batt Chrgr III 120 V Vital Inverters 1-III, 2-III 480 V Loads Air Return Fan 1A-A CCS Pump 1A-A EGTS Fan A-A CR AHU A-A 125 V Vital Batt Chrgr I 120 V Vital Inverters 1-I, 2-I Not needed for Unit 2 CCS Pump C-S Not needed for Unit 2 ABGTS Fan B-B Not needed for Unit 2 Aux Control Air Compressor B-B Not needed for Unit 2 120 V Vital Inverters 1 II, 2 II 120 V Vital Inverters 1 III, 2 III 120 V Vital Inverters 1 I, 2 I 125 V Vital Batt Chrgr IV Not needed for Unit 2 120 V Vital Inverters 1-IV, 2-IV Not needed for Unit 2 ###

Note ### :

- Mode 5: RCS loops filled and 2 SG water level 21% NR, or

- Mode 6: Reactor Vessel water level 23 ft above flange

Summary Nuclear 3/4 Changes to the SQN TSs are required to facilitate 6.9 kV and Nuclear 480 V board maintenance and alleviate the overly restrictive CTS requirements 3/4 ITS will establish controls commensurate with the safety 3/4 ITS will establish controls commensurate with the safety function of the affected equipment 3/4 Additional Actions for inoperable AC power sources (or de-energi ed boards) on the opposite nit ha e been de eloped energized boards) on the opposite unit have been developed 3/4 ITS LCO 3.8.1 Actions will require declaring required features supported by the inoperable AC power source inoperable when redundant features are also inoperable, with a backstop 3/4 ITS LCO 3.8.9 Actions will require declaring the required features supported by the de-energized board inoperable features supported by the de energized board inoperable immediately

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