ML20036C968

Technical Specifications Bases, Manual

ML20036C968
Person / Time
Site:	Susquehanna
Issue date:	01/29/2020
From:	Susquehanna
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML20036C968 (48)

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Udll. L.;J I L.UL.U Page 1 of 2

• MANUAL HARD COPY DISTRIBUTION DOCUMENT TRANSMITTAL 2020-1642 USER INFORMATION:

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TO: GERLACH*ROSEY M 01/29/2020 LOCATION: USNRC FROM: NUCLEAR RECORDS DOCUMENT CONTROL CENTER (NUCSA-2)

THE FOLLOWING CHANGES HAVE OCCURRED TO THE HARDCOPY OR ELECTRONIC MANUAL ASSIGNED TO YOU. HARDCOPY USERS MUST ENSURE THE DOCUMENTS PROVIDED MATCH THE INFORMATION ON THIS TRANSMITTAL. WHEN REPLACING THIS MATERIAL IN YOUR HARDCOPY MANUAL, ENSURE THE UPDATE DOCUMENT ID IS THE SAME DOCUMENT ID YOU'RE REMOVING FROM YOUR MANUAL. TOOLS OM THE HUMAN PERFORMANCE TOOL BAG SHOULD BE UTILIZED TO ELIMINATE THE CHANCE OF

• RORS. * .

ATTENTION: "REPLACE" directions do not affect the Table of Contents, Therefore no TOC will be issued with the updated material.

TSB2 - TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL REMOVE MANUAL TABLE OF CONTENTS DATE: 01/17/2020 ADD MANUAL TABLE OF CONTENTS DATE: 01/28/2020 CATEGORY: DOCUMENTS TYPE: TSB2

UcUl. L.;J 1 L.UL.U Page 2 of 2

• ID: TEXT 3.8.1 ADD: REV: 15 REMOVE: REV: 14 ANY DISCREPANCIES WITH THE MATERIAL PROVIDED, CONTACT DCS@ X3171 OR X3194 FOR ASSISTANCE. UPDATES FOR HARDCOPY MANUALS WILL BE DISTRIBUTED WITHIN 3 DAYS IN ACCORDANC~ WITH DEPARTMENT PROCEDURES. PLEASE MAKE ALL CHANGES AND ACKNOWLEDGE COMPLETE IN YOUR NIMS INBOX UPON COMPLETION OF UPDATES. FOR ELECTRONIC MANUAL USERS, ELECTRONICALLY REVIEW THE APPROPRIATE DOCUMENTS AND ACKNOWLEDGE COMPLETE IN YOUR NIMS INBOX .

SSES MANUAL Manual Name: TSB2

~anual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL Table Of Contents Issue Date: 01/28/2020 Procedure Name Rev Issue Date Change ID Change Number.

TEXT LOES 138 01/03/2019

Title:

LIST OF EFFECTIVE SECTIONS TEXT TOC 25 03/05/2019

Title:

TABLE OF CONTENTS TEXT 2.1.1 5 01/22/2015

Title:

SAFETY LIMITS (SLS) REACTOR CORE SLS TEXT 2.1.2 1 TEXT 3.1.1 TEXT 3.1.2 11/16/2016 TEXT 3.1.4 5 11/16/2016

Title:

REACTIVITY CONTROL SYSTEMS CONTROL ROD SCRAM TIMES TEXT 3.1.5 2 11/16/2016

Title:

REACTIVITY CONTROL SYSTEMS CONTROL ROD SCRAM ACCUMULATORS TEXT 3.1.6 4 11/16/2016

Title:

REACTIVITY CONTROL SYSTEMS ROD PATTERN CONTROL

?age 1 of 8 Report Date: 01/29/20

SSES MANUAL Manual Name: TSB2 tanual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL 11/16/2016 TEX:T 3 .1. 7 4

Title:

REACTIVITY CONTROL SYSTEMS STANDBY LIQUID CONTROL (SLC) SYSTEM

. TEXT 3 .1. 8 4 11/16/2016

Title:

REACTIVITY CONTROL SYSTEMS SCRAM DISCHARGE VOLUME (SDV) VENT AND DRAIN VALVES TEXT 3.2.1 5 11/16/2016

.Title: POWER DISTRIBUTION LIMITS AVERAGE PLANAR LJNEAR HEAT GENERATION RATE (APLHGR)

TEXT 3.2.2 4 11/16/2016

Title:

POWER DISTRIBUTION LIMITS MINIMUM CRITICAL POWER RATIO (MCPR)

TEXT 3.2.3 .3 11/16/2016

Title:

POWER DISTRIBUTION LIMITS LINEAR HEAT GENERATION RATE LHGR

'EXT 3 . 3 . 1 . 1 6 11/16/2016

Title:

INSTRUMENTATION REACTOR PROTECTION SYSTEM (RPS) INSTRUMENTATION TEXT 3.3.1.2 4 . 01/23/2018

Title:

INSTRUMENTATION SOURCE RANGE MONITOR (SRM) INSTRUMENTATION TEXT 3.3.2.1 4 11/16/2016

Title:

INSTRUMENTATION CONTROL ROD BLOCK INSTRUMENTATION TEXT 3.3.2.2 3 11/16/2016

Title:

. INSTRUMENTATION FEEDWATER - MAIN TURBINE HIGH WATER LEVEL TRIP INSTRUMENTATION TEXT 3.3.3.1 9 11/16/2016

Title:

INSTRUMENTATION POST ACCIDENT MONITORING (PAM) INSTRUMENTATION TEXT 3.3.3.2 2 11/16/2016_

Title:

INSTRUMENTATION REMOTE SHUTDOWN SYSTEM TEXT 3.3.4.1 2 11/16/2016

Title:

INSTRUMENTATION END OF CYCLE RECIRCULATION .PUMP TRIP (EOC-RPT) INSTRUMENTATION. *

!?age 2 of 8 Report Date: 01/29/20

SSES MANUAL Manual Name: TSB2

~anual

Title:

TECHNICAL SPECIFICATIONS BASES-UNIT 2 MANUAL TEXT 3.3.4.2 1 11/16/2016

Title:

INSTRUMENTATION ANTICIPATED TRANSIENT WITHOUT SCRAM RECIRCULATION PUMP TRIP (ATWS-RPT) INSTRUMENTArION TEXT 3.3.5.1 7 03/05/2019*

Title:

INSTRUMENTATION EMERGENCY CORE COOLING SYSTEM (ECCS) INSTRUMENTATION TEXT 3.3.5.2 2 03/05/2019

Title:

REACTOR PRESSURE VESSEL (RPV) WATER INVENTORY CONTROL INSTRUMENTATION TEXT 3.3.5.3 0 03/05/2019

Title:

INSTRUMENTATION REACTOR CORE ISOLATION COOLING (RCIC) SYSTEM INSTRUMENTATION (PREVIOUSLY TEXT 3.3.5.2 REVISION 1)

TEXT 3.3.6.1 9 03/05/2019

Title:

INSTRUMENTATION PRIMARY CONTAINMENT ISOLATION INSTRUMENTATION

.EXT 3. 3. 6. 2 . . 6 03/05/2019

Title:

INSTRUMENTATION SECONDARY CONTAINMENT ISOLATION INSTRUMENTATION TEXT 3.3.7.1 4 03/05/2019

Title:

INSTRUMENTATION CONTROL.ROOM EMERGENCY OUTSIDE AIR SUPPLY (CREOAS) SYSTEM INSTRUMENTATION TEXT 3.3.8.1 4 11/16/2016 *

Title:

INSTRUMENTATION LOSS OF POWER (LOP) INSTRUMENTATION TEXT 3.3.8.2 1 11/16/2016

Title:

INSTRUMENTATION REACTOR PROTECTION SYSTEM (RPS) ELECTRIC POWER MONITORING TEXT 3.4.1 5 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) RECIRCULATION LOOPS OPERATING TEXT 3.4.2 4 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) JET PUMPS TEXT 3.4.3 3 01/13/2012

Title:

REACTOR COOLANT SYSTEM (RCS) SAFETY/RELIEF VALVES (S/RVS)

!?age 3 of 8 Report Date: 01/29/20

SSES MANUAL Manual Name: TSB2 lanual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL TEXT 3.4.4 1 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) RCS OPERATIONAL LEAKAGE TEXT 3.4.5 3 03/10/2010

Title:

REACTOR COOLANT SYSTEM (RCS) RCS PRESSURE ISOLATION VALVE (PIV) LEAKAGE TEXT 3.4.6 5 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) RCS LEAKAGE DETECTION INSTRUMENTATION TEXT 3.4.7 3 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) RCS SPECIFIC ACTIVITY TEXT 3.4.8 3 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) RESIDUAL HEAT REMOVAL (RHR) SHUTDOWN COOLING SYSTEM

- HOT SHUTDOWN EXT 3 .4 .9 2 1.1/16/2016 . *

Title:

REACTOR COOLANT SYSTEM (RCS) *RESIDUAL HEAT REMOVAL .(RHR) SHUTDOWN COOLING SYSTEM

- COLD SHUTDOWN TEXT 3.4.10 6 05/14/2019

Title:

REACTOR COOLANT SYSTEM (RCS) RCS PRESSURE AND TEMPERATURE (P/T) LIMITS TEXT 3.4.11 1 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) REACTOR STEAM DOME PRESSURE TEXT 3.5.1 6 03/05/2019

Title:

EMERGENCY CORE COOLING SYSTEMS (ECCS) REACTOR PRESSURE VESSEL (RPV) WATER INVENTORY CONTROL AND REACTOR CORE ISOLATION COOLING (RCIC) SYSTEM ECCS OPERATING TEXT 3.5.2 5 03/05/2019

.Title: EMERGENCY CORE COOLING SYSTEMS (ECCS) REACTOR.PRESSURE VESSEL (RPV) WATER INVENTORY CONTROL AND REACTOR CORE ISOLATION COOLING (RCIC) SYSTEM ECCS OPERATING TEXT 3.5.3 6 03/05/2019

Title:

EMERGENCY CORE COOLING SYSTEMS (ECCS) REACTOR PRESSURE VESSEL (RPV) WATER INVENTORY CONTROL AND REACTOR CORE ISOLATION COOLING (RCIC) SYSTEM ECCS OPERATING Page 4 of 8 Report Date: 01/29/20

SSES MANUAL Manual Name: TSB2

.tanual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL TEXT 3.6.1.1 6 11/16/2016

Title:

PRIMARY CONTAINMENT TEXT 3.6.1.2 2 11/16/2016

Title:

CONTAINMENT SYSTEMS PRIMARY CONTAINMENT AIR LOCK TEXT 3.6.1.3 17 03/05/2019

Title:

CONTAINMENT SYSTEMS PRIMARY CONTAINMENT ISOLATION VALVES (PCIVS)

TEXT 3 . 6 . *l . 4 2 11/16/2016

Title:

CONTAINMENT SYSTEMS CONTAINMENT PRESSURE TEXT 3.6.1.5 2 11/16/2016

Title:

CONTAINMENT SYSTEMS DRYWELL AIR TEMPERATURE

.EXT 3. 6 .1. 6 1 11/16/2016

Title:

CONTAINMENT SYSTEMS SUPPRESSION CHAMBER-TO-DRYWELL VACUUM BREAKERS TEXT 3.6.2.1 3 11/16/2016

Title:

CONTAINMENT SYSTEMS SUPPRESSION POOL AVERAGE TEMPERATURE TEXT 3.6.2.2' 2 03/05/2019

Title:

CONTAINMENT SYSTEMS SUPPRESSION POO~ WATER LEVEL.

TEXT 3.6.2.3 2 11/16/2016

Title:

CONTAINMENT SYSTEMS RESIDUAL HEAT REMOVAL (RHR) SUPPRESSION POOL COOLING TEXT 3.6.2.4 1 11/16/2016

Title:

CONTAINMENT SYSTEMS RESIDUAL HEAT REMOVAL (RHR) SUPPRESSION POOL SPRAY TEXT 3 . 6 . 3 . 1

• 2 06/13/2006

Title:

CONTAINMENT SYSTEMS INTENTIONALLY LEFT BLANK TEXT 3.6.3.2 3 09/29/2017

Title:

CONTAINMENT SYSTEMS DRYWELL AIR FLOW SYSTEM Page 5 of 8 Report Date: 01/29/20

SSES MANUAL Manual Name: TSB2 tanual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL TEXT 3.6.3.3 3 09/29/2017

Title:

CONTAINMENT SYSrEMS PRIMARY CONTAINMENT OXYGEN CONCENTRATION TEXT 3.6.4.1 16 03/05/2019

Title:

CONTAINMENT SYSTEMS SECONDARY CONTAINMENT TEXT 3.6.4.2 14 03/05/2019

Title:

CONTAINMENT SYSTEMS SECONDARY CONTAINMENT ISOLATION VALVES (SCIVS)

TEXT 3.6.4.3 7 03/05/2019

Title:

CONTAINMENT SYSTEMS STANDBY GAS TREATMENT (SGT) SYSTEM TEXT 3.7.1 7 03/01/2017

Title:

PLANT SYSTEMS RESIDUAL HEAT REMOVAL SERVICE WATER (RHRSW) SYSTEM AND THE ULTIMATE HEAT SINK (UHS)

'EXT 3. 7 .2 3 11/16/2016

Title:

PLANT SYSTEMS EMERGENCY SERVICE WATER (ESW) SYSTEM TEXT 3.7.3 4 03/05/2019

Title:

PLANT SYSTEMS .CONTROL ROOM EMERGENCY OUTSIDE AIR SUPPLY (CREOAS) SYSTEM TEXT 3.7.4 2 03/05/2019.

Title:

PLANT SYSTEMS CONTROL ROOM FLOOR COOLING SYSTEM TEXT 3.7.5 2 11/16/2016

Title:

PLANT SYSTEMS MAIN CONDENSER OFFGAS TEXT 3.7.6 4 11/16/2016

Title:

PLANT SYSTEMS MAIN TURBINE BYPASS SYSTEM TEXT 3.7.7 2 11/16/2016

Title:

PLANT SYSTEMS SPENT FUEL STORAGE POOL WATER LEVEL TEXT 3.7.8 1 11/16/2016

Title:

MAINE TURBINE PRESSURE REGULATION SYSTEM

?age 6 of 8 Report Date: 01/29/20

SSES MANUAL Manual Name: TSB2

~anual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL TEXT 3.8.1 15 01/28/2020

Title:

ELECTRICAL POWER SYSTEMS AC SOURCES - OPERATING TEXT 3.8.2 1 03/05/2019

Title:

ELECTRICAL POWER SYSTEMS AC SOURCES - SHUTDOWN TEXT 3.8.3 7 08/07/2019

Title:

ELECTRICAL POWER SYSTEMS DIESEL FUEL OIL LUBE OIL AND STARTING AIR TEXT 3.8.4 4 11/16/2016

Title:

ELECTRICAL POWER SYST~MS DC SOURCES - OPERATING TEXT 3.E!.5 2 03/05/2019

Title:

ELECTRICAL POWER SYSTEMS DC SOURCES - SHUTDOWN

.EXT .3. 8. 6 2 11/16/2016

Title:

• ELECTRICAL POWER SYSTEMS BATTERY CELL PARAMETERS TEXT 3.8.7 7 09/04/2019

Title:

ELECTRICAL POWER SYSTEMS DISTRIBUTION SYSTEMS - OPERATING TEXT 3.8.8 2 03/05/2019

Title:

ELECTRICAL POWER SYSTEMS DISTRIBUTION SYSTEMS - SHUTDOWN TEXT 3.9.1 1 11/16/2016

Title:

REFUELING OPERATIONS REFUELING EQUIPMENT INTERLOCKS TEXT 3.9.2 2 11/16/2016

Title:

REFUELING OPERATIONS REFUEL POSITION ONE-ROD-OUT INTERLOCK TEXT 3.9.3 1 11/16/2016

Title:

REFUELING OPERATIONS CONTROL ROD POSITION TEXT 3.9.4 0 11/18/2002

Title:

REFUELING OPERATIONS CONTROL ROD POSITION INDICATION

~age 7 of 8 Report.Date: 01/29/20

SSES MANUAL Manual Name: TSB2 lanual

Title:

TECHNICAL SPECIFICATIONS BASES UNIT 2 MANUAL TEXT 3. 9. 5

• 1 11/16/2016

Title:

REFUELING OPERATIONS CONTROL ROD OPERABILITY - REFUELING TEXT *3.9.6 2 11/16/2016

Title:

REFUELING OPERATIONS REACTOR PRESSURE VESSEL (RPV) WATER LEVEL TEXT 3.9.7 1 11/16/2016 Tit~e: REFUELING OPERATIONS RESIDUAL HEAT REMOVAL (RHR) ~HIGHWATER LEVEL TEXT 3.9.8 1 11/16/2016

Title:

REFUELING OPERATIONS ~ESIDUAL HEAT REMOVAL (RHR) - LOW WATER LEVEL TEXT 3.10.1 2 03/05/2019

Title:

SPECIAL OPERATIONS INSERVICE LEAK AND HYDROSTATIC TESTING OPERATION

.'EXT 3 .10. 2 1 11/16/2016

Title:

SPECIAL OPERATIONS REACTOR MODE SWITCH INTERLOCK TESTING TEXT 3 .10. 3 1 11/16/2016

Title:

SPECIAL OPERATIONS SINGLE CONTROL ROD WITHDRAWAL - HOT SHUTDOWN TEXT 3.10.4 1 11/16/2016

Title:

SPECIAL OPERATIONS SI;NGLE CONTROL ROD WITHDRAWAL - COLD SHUT.DOWN TEXT 3.10.5 1 11/16/2016

Title:

SPECIAL OPERATIONS SINGLE CONTROL ROD DRIVE (CRD) REMOVAL - REFUELING TEx;T 3.10.6 1 11/16/2016

Title:

SPECIAL OPERATIONS MULTIPLE CONTROL ROD WITHDRAWAL - REFUELING TEXT 3.10.7 1 03/24/2005

Title:

SPECIAL OPERATIONS CONTROL ROD TESTING - OPERATING TEXT 3.10.8 3 11/16/2016

Title:

SPECIAL OPERATIONS SHUTDOWN MARGIN (SDM) TEST - REFUELING t>age 8 of 8 Report Date: 01/29/20

Rev. 15 AC Sources-Operating B 3.8.1 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.1 AC Sources-Operating BASES BACKGROUND The unit Class 1E AC Electrical Power Distribution System AC sources consist of two offsite power sources (preferred power sources, normal and alternate), and the onsite standby power sources (diesel generators (DGs) A, B, C and D). A fifth diesel generator, DG E, can be used as a substitute for any one of the four DGs A, B, C or D. As required by 10 CFR 50, Appendix A, GDC 17 (Ref. 1), the design of the AC electrical power system provides independence and redundancy to ensure _an available source of power to the Engineered Safety Feature (ESF) systems.

The Class 1E AC distribution system is divided into redundant load groups, so loss of any one group does not prevent the minimum safety functions from being performed. Each load group has connections to two preferred offsite power supplies and a single DG .

• The two qualified circuits between the offsite transmission network and the onsite Class 1E AC Electrical Power Distribution System are supported by two independent offsite power sources. A 230 kV line from the Susquehanna T1 O 230 kV switching station feeds start-up transformer No. 1O; and, a 230 kV tap from the 500-230 kV tie line feeds the startup transformer No. 20. The term "qualified circuits", as used within TS 3.8.1, is synonymous with the term "physically independent".

The two independent offsite power sources are supplied to and are shared by both units.* These two electrically and physically separated circuits provide AC power, through startup transformers (ST) No. 1O and ST No. 20, to the four 4.16 kV Engineered Safeguards System (ESS) buses (A, B, C and D) for both Unit 1 and Unit 2. A detailed description of the offsite power network and circuits to the onsite Class 1E ESS buses is found in the FSAR, Section 8.2 (Ref. 2).

An offsite circuit consists of all breakers*, transformers, switches,.

automatic tap changers, interrupting devices, cabling, and controls required to transmit power from the offsite transmission network to the onsite Class 1E ESS bus or buses .

• SUSQUEHANNA - UNIT 2 3.8-1

Rev. 15 AC Sources-Ope rating .

• • BASES BACKGROUN D (continued)

ST No. 1O and ST No. 20 each provide the normal source of power to two of the four 4.16 kVESS buses in each Unit and the alternate source of B 3.8.1 power to the remaining two 4.16 kV ESS buses in each Unit. *If any

• 4.16 kV ESS bus lo~es power, an automatic transfer from the nornial to the alternate occurs after the normal supply breaker trips.

When off-site power is available to the 4.16 kV ESS Buses following a LOCA signal, the required ESS loads will be sequenced onto the 4.16 kV ESS Buses in order.to compensate for voltage drops in the onsite power system when starting large ESS motors.

The onsite standby power source for 4.16 kV ESS buses A, B, C and D consists of five DGs. DGs A, B, C and D are dedicated to ESS buses A, B, C and D, respectively. DG.E cari be used as a substitut~ for any one of the four DGs (A, B, C or O) to supply the associated ESS bus. Each DG provides standby power to two 4.16 kV ESS buses-one associated .

with Unit 1 and one associated with Unit 2. The four "required" DGs are those aligned to a 4.16 kV ESS bus to provide onsite standby power for both Unit 1 and Unit 2.

• A DG, when aligned to an ESS bus, starts automatically on a loss of coolant accident (LOCA) signal (i.e., low reactor water level signal or high drywell pressure signal) or on an ESS bus degraded voltage or undervoltage signal. After the DG has started, it automatically ties to its respective bus after offsite power is tripped as a consequence of ESS bus undervoltage or degraded voltage, independent of or coincident with a LOCA signal. The DGs also start and operate in the standby mode without tying to the ESS bus on a LOCA signal alone. Following the trip of offsite power, non-permanent loads are stripped from the 4.16 kV ESS Buses. When a DG _is tied to the ESS Bus, loads are then sequentially connected to their respective ESS Bus by individual load timers. The individual load timers control the starting permissive signal to motor breakers to prevent overloading the associated. DG.

In the event of loss of normal and alternate offsite power supplies, the 4.16 kV ESS buses will .shed .all loads except the 480 V load centers and the standby diesel generators will connect to the ESS busses. When a DG is tied to its respective ESS bus, loads are then sequentially connected to the ESS bus by individual load timers which control the permissive and starting signals to motor breaker~ to prevent overloading the DG.

SUSQUEHAN NA - UNIT 2 3.8-2

Rev. 15 AC Sources-Ope rating B 3.8.1 BASES BACKGROUN D In the event of a loss of normal and alternate offsite power supplies, the (continued) ESS $1ectrical loads are automatically connected to the DGs in sufficient time to provide for safe reactor shutdown and to mitigate the consequences of a Design Basis Accident (OBA) such.as a LOCA.

Certain required plant loads are returned to service in a predetermined sequence in order to prevent overloading of the DGs in the process.

Within 286 seconds after the initiating signal is received, all automatic and permanently connected loads needed to recover the unit or maintain it in a safe condition are returned to service. Ratings for the DGs satisfy the requirements of Regulatory Guide . 1.9 (Ref. 3).

DGs A, B, C and D have the following ratings:

a. 4000 kW-continuo us,

b. 4700 kW-2000 hours, DG E has the following ratings:

a. 5000 kW-continuo us,

b. 5500 kW__:_2000 hours .

• APPLICABLE SAFETY ANALYSES The initial conditions ofDBA and transient analyses in the FSAR, Chapter 6 (Re( 4) and Chapter 15 (Ref. 5), assume ESF systems are OPERABLE. The AC electrical power sources are designed to provide sufficient capacity, capability, redundancy, and reliability to ensure the availability of necessary power to ESF systems so that the fuel, Reactor Coolant System (RCS), and containment design limits are not exceeded.

• These limits are discussed in more detail in the Bases for Section 3.2, Power Distribution Limits; Section 3.4, Reactor Coolant System (RCS);

and Section 3.6, Containment Systems.

The OPERABILITY of the AC electrical power sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit and supporting safe shutdown of the other unit. This includes mair:,taining the onsite or offsite AC sources OPERABLE during accident conditions in the event of an assumed loss of all offsite power or all onsite AC power; and a worst case single failure.

AC sources satisfy Criterion 3 of the NRC Policy Statement (Ref. 6) .

• SUSQUEHAN NA - UNIT 2 3.8-3

Rev. 15 AC Sources-Operating B 3.8.1 BASES LCO Two qu~lified circuits between the offsite transmission network and the onsite Class 1E Distribution System and four separate and independent DGs (A, B, C and D) ensure availability of the -required power to shut down the reactor and maintain it in a safe shutdown condition after an anticipated operational occurrence (AOO) or a postulated OBA. DG E can be used as a substitute for any one of the four DGs A, B, C or D.

Qualified offsite circuits are those that are described in the FSAR, and are part of the licensing basis for the unit.. In addition, the required automatic load timers for each ESF bus shall be OPERABLE.

The Safety Analysis for Unit 2 assumes the OPERABILITY of some equipment that receives power from Unit 1 AC Sources. Therefore, Unit 2 Technical Specifications establish requirements for the OPERABILITY of the DG(s) and qualified offsite circuits needed to support the Unit 1 onsite Class 1E AC electrical power distribution subsystem(s) required by LCO 3.8.7, Distribution System*s_:Operating.

Each offsite circuit must be capable of maintaining rated frequency and voltage, and accepting required loads during an accident, whife

• connected to the ESS buses .

One OPERABLE offsite circuit exists when all of the following conditions are met:

1. An energized ST. No. 1O transformer with the load tap changer (LTC) in automatic operation.

2. The respective circuit path including energized ESS transformers 101 and 111 and feeder breakers capable of supplying three of the four 4.16kV ESS Buses*.

3. Acceptable offsite grid V(?ltage, defined as a voltage that is within the grid voltage requirements established for SSES. The grid a

voltage requirements include both minimum grid voltage and an allowable grid voltage drop during normal operation, and for a predicted voltage for a trip of the unit.

The Regional Transmission Operator (PJM}, and/or the Transmission Power System Dispatcher, PPL EU, determine, monitor and report actual and/or contingency voltage (Predicted voltage) violations that occur for the SSES monitored offsite 230kV and 500kV buses.

SUSQUEHANNA - UNIT 2 3.8-4

Rev. 15 AC Sources-Operating

• • *BASES LCO (continued)

B 3.8.1 The offsite circuit is inoperable for any actual voltage violation, or a contingency voltage violation that occurs for a trip of a SSES unit, as reported by the transmission RTO or Transmission Power System Dispatcher.

The offsite circuit is operable for any other predicted grid event (i.e., loss of the most critfcal transmission line or the largest supply) that does not result from the generator trip of a SSES unit. The~e conditions do not represent an impact on SSES operation that has been caused by a LOCA and subsequent gen.erator trip. The design basis does not require entry into LCOs for predicted grid conditions that cannot result in a LOCA, delayed LOOP.

The other offsite circuit is Operable when all the following conditions are m~ .

1. An energized ST. No. 20 transformer with the load tap changer (LTC) in autoi:natic operation. *

• 2. The respective circuit path including energized ESS transformers 201 and 211 and feeder breakers capable of supplying three of the four 4.16kV ESS Buses.

3. Acceptable offsite grid voltage, defineq as a voltage that is *

. within the grid voltage requirements established for SSE~.

• The grid voltage requirements include both a minimum grid voltage and an allowable grid voltage drop during normal operation, and for a predicted voltage for a trip of the unit.

The Regional Transmission Operator (PJM}, and/or the Transmission-Power System Dispatcher, PPL EU, determine, monitor and report actual and/or contingency voltage (Predicted voltage) violations that occur for the SSES monitored offsite 230kV and 500kV buses.

The offsite circuit is inoperable for any actual voltage violation, or a contingency voltage violation that occurs for a trip of a SSES unit, as reported by the transmission RTO or Transmission Power System Dispatcher.

• • SUSQUEHANNA - UNIT 2 3.8-5

• ,

• Rev. 15 AC Sources-Operating B 3.8.1 BASES LCO The offsite circuit is operable for any other predicted grid (continued) event (i.e., loss of the most critical transmission line or the larg.est supply) that does nofresult from the generator trip of a SSES unit. These conditions do not represent an impact .

on SSES operation that has been caused by a LOCA and subsequent generator trip. The design. basis does not require entry into LCOs for predicted grid conditions that cannot result in a LOCA, delayed LOOP.

Both offsite circuits are OPERABLE provided each meets the .criteria described above and provided that no 4.1.6kV ESS Bu.s has less than one OPERABLE offsite circuit capable of supplying the required loads. If no OPERABLE offsite circuit is capable of supplying any of the 4.16 kV ESS Buses, one offsite source shall be declared inoperable. Unit 2 also requires Unit 1 offsite circuits to be OPERABLE .

. If a Unit 1 4.16 kV bus is de-energized solely for the purpose of performing maintenance, it is not required to declare an offsite source or diesel generator inoperable. * ,-

• . Four of the five DGs are required to be Operable to satisfy the initial assumptions of the accident analyses. Each required DG must be capable of starting, accelerating to rated speed and voltage, and

• connecting to its respective ESS bus on detection of bus undervoltage after the normal and alternate supply breakers. open. This sequence must be accomplished within 1O seconds. If a Unit 1 4.16 kV bus is isolated from its DG solely for the performance of bus maintenance, the DG is not required to be declared inoperable. Each DG must also be capable of accepting required loads within the assumed loading sequence intervals, and.must continue to operate until offsite power can be restored to the ESS buses. These capabilities are required to be met from a variety of initia_l conditions, such as DG in standby with the* engine hot and DG in normal standby conditions. Normal standby conditions for a DG mean that the diesel engine oil is being continuously circulated and engine coolant is circulated as necessary to maintain temperature consistent with manufacturer recommendations. Additional DG capabilities must be demonstrated to meet required Surveillances, e.g.,

capability of the DG to revert to standby status on an ECCS signal while operating in parallel test mode.

• Although-not normally aligned as a required DG, DG Eis normally

• maintained OPERABLE (i.e., Surveillance Testing completed) so that it

• • can be used as a substitute for any one of the four DGs A, B, C or D.

SUSQUEHANNA - UNIT 2 3.8-6

Rev. 15 AC Sources-Operating B 3.8.1 BASES LCO Proper sequencing of loads, including tripping of nonessential loads, is a (continued) required function for DG OPERABILITY.

The AC sources must be separate and independent (to the extent possible) of other AC sources. For the DGs, the separation and independence are complete. For the offsite AC sources, the separation and independence are to the extent practical. A circuit may be connected to more than one ESS bus, with automatic transfer capability to the other circuit OPERABLE, and not violate separation criteria. A circuit that is not connected to an ESS bus is required to have OPERABLE automatic transfer interlock mechanisms to each ESS bus to support OPERABILITY of that offsite circuit. If a Unit 1 - 4.16 kV bus is de-energized solely for the purpose of performing maintenance, automatic tr~nsfer interlock mechanisms for'the de-energized bus are not required to be operable.

APPLICABILITY The AC sources are required to be OPERABLE in MODES { 2, and 3 to ensure that:

• a.

b.

Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of AOOs or abnormal transients; and Adequate core cpoling is provided and containment OPERABILITY and other vital functions are maintained in the event of a postulated OBA.

The AC power requirements for MODES 4 and 5 are covered in LCO 3.8.2, "AC Sources-Shu tdown."

• ACTIONS A Note prohibits the application of LCO 3.0.4.b to an inoperable DG.

• There is an increased risk associated with entering a MODE or other specified condition in the Applicability With an inoperable DG and the provisions of LCO 3.0.4.b, which allow entry into a MODE or other specified condition in the Applicability with the LCO not met after performance of a risk assessment addressing inoperable systems and

• components, should not be applied in this circumstance.

SUSQUEHAN NA - UNIT 2 3.8-7

Rev. 15 AC Sources-Ope rating B 3.8.1 BASES ACTIONS The ACTIONS are modified by a Note which allows entry into associated (continued) Conditions and Required Actions to be delayed for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when an OPERABLE diesel generator is placed in an inoperable status for the alignment of diesel generator E to or from the Class 1E distribution system. Use of this allowance requires both offsite circuits to be OPERABLE. Entry into the appropriate Conditions and Required Actions shall be made immediately upon the determination that substitution of a required diesel generator will not *or can not be completed.

• When Note 3 is in effect, the following restrictions (Reference 14) shall occur:.

1.) No maintenance or testing that affects the reliability of the remaining OPERABLE Unit 1 and Unit 2 4160 V subsystems shall be scheduled. If any testing or maintenance activities must be performed during this time, an evaluation shall.be performed in accordance with Title 10 to the Code of Federal Regulations (1 O CFR) Section 50.65(a)(4) .

• 2.)

3.)

The required systems; subsystems, trains, components, and devices that depend on the remaining 4160 V buses shall be verified OPERABLE.

The Unit 2 safety-related HPCI and RCI.C pumps shall be controlled as "protected equipment" and not taken out of service for planned maintenance while a Unit 1 4160 V bus is out of service for extended maintenance.

Note 3 modifies the ACTIONS by allowing a Unit 1 4160 V subsystem (4.16 kV bus) to be de-energized for bus maintenance when Unit 1 is in Modes 4 or. 5 and Unit 2 is in Modes 1, 2, or 3 without requiring either offsite circuit or the associated di~sel generator to be declared inoperable: Only entry into LCO 3.8.7 Condition C is required for this maintenance activity. While in this configuration, immediate entry into LCO 3.8.1 is required for any offsite circuit or DG that becomes inoperable. Note 3 no longer applies .

• • • SUSQUEHAN NA - UNIT 2 3.8-8

Rev. 15 AC Sources-Operating

• • BASES ACTIONS B 3.8.1 (continued)

To ensure a highly reliable power source remains with one offsite circuit inoperable, it is necessary to verify the availability of the remaining

• required offsite circuit on a more frequent basis. Since the Required Action only specifies "perform," a failure of SR 3.8.1.1 acceptance criteria does not result in a Required Actfon not met. However, if a second required circuit fails SR 3.8.1.1, the second offsite circuit is inoperable, and Condition C, for two offsite circuits inoperable, is entered.

Required Action A.2, which only applies if one 4.16 kV *ESS bus cannot be powered from any offsite source, is intended to provide assurance that an event with a coincident single failure of the associated DG does not result in a complete loss of safety function of critical systems. These features (e.g., system, subsystem, division, component, or device) are designed to be powered from redundant safety related 4.16 kV ESS buses. Redundant required features failures consist of inoperable

_. features associated with an emergency bus redundant to the emergency

• bus that has no offsite power. The Completion Time for Required Action A.2 is intended to allow time for the operator to evaluate and repair any discovered inoperabilities. Th.is Completion Time also allows an exception to the normal "time zero" for beginning the allowed outage time "clock." In this Required Action, the Completion Time only begins on discovery that both:

a. A 4.16 kV ESS bus has no offsite power supplying its loads; and

b. A redundant required feature on another 4.16 kV ESS bus is

• inoperable.

If, at any time during the existence of this Condition (one offsite circuit inoperable) a required feature subsequently becomes inoperable, this Completion Time would begin to be tracked.

Discovering no offsite power to one 4.16 kV ESS bus on the onsite Class 1E Power Distribution System coincident with one or more inoperable required support or supported features, or both, that are associat_ed with any other emergency bus that has offsite power, results in starting the Completion Times for the Required Action. Twenty-four hours is acceptable because it minimizes risk while allowing time for restoration before the unit is subjected to transients associated with shutdown.

SUSQUEHANNA - UNIT 2 3.8-9

Rev. 15 AC Sources-Operating B 3.8.1 BASES ACTIONS A.2 (continued)

(continued)

The remaining OPERABLE offsite circuits and DGs are adequate to supply electrical power to the onsite Class 1E Distribution System. Thus, on a component basis, single failure protection may have been lost for the required feature's function; however, function is not lost. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Completion Time takes into account the component OPERABILITY of the redundant counterpart to' the inoperable required feature. Additionally, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Completion Time takes into account the capacity and capability of the remaining AC sources, a reasonable time for repairs, and the low probability of a OBA occurring during this period.

According to Regulatory Guide 1.93 (Ref. 7), operation may continue in Condition A for a period that should not exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. With* one offsite circuit inoperable, the reliability of the offsite system is degraded, and the potential for a loss of offsite power is increased, with attendant potential for a challenge to the plant safety systems. In this condition, however, the remaining OPERABLE offsite circuit and DGs are adequate to supply electrical power to the onsite Class 1E Distribution System .

The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Completion Time takes into account the capacity and capability of the remaining AC sources, reasonable time for repairs, and the low probability of a OBA occurring during this period.

To ensure a highly reliable power source remains with one required DG inoperable, it is necessary to verify the availability 'of the required offsite circuits on a more frequent basis. Since the Required Action only specifies "perform," a failure of SR 3.8.1.1 acceptance criteria does not result in a Required Action being not met. However, if a circuit fails to pass SR 3.8.1.1, it is inoperable. Upon offsite circuit inoperability, additional Conditions must then be entered .

• SUSQUEHANNA - UNIT 2 3.8-10

Rev. 15 AC Sources-Operatin g B 3.8.1 BASES ACTIONS (continued)

Required Action 8.2 is intended to provide assurance that a loss of offsite power, during the period that a DG is inoperable, does not result in a complete loss of safety function of critical systems. These features are designed with redundant safety-related divisions (i.e., single division syste*ms are not includedf Redundant required features failures consist of inoperable features associated with a division redundant to the division that has an inoperable DG.

The Completion Time is intended to allow the operator time to evaluate

• and repair any discovered inoperabilities. This Completion Time c!lso allows for an exception to the normal "time zero" for beginning the allowed outage time "clock." fn this Required Action the Completion Time only begins on discovery that both:

a. An inoperable DG exists; and

b. A required feature powered from another diesel generator (Division 1 or 2) is inoperable .

• If, at any time during-the existence of this Condition (one.r~quired DG inoperable), a required feature subsequently becomes inoperable, this Completion Time begins to be tracked.

Discovering one required DG inoperable coincident with one or more inoperable required support or supported features, or both, that are associated with the OPERABLE DGs results in starting the Completion Time for the Required Action. Four hours from the discovery of these events existing concurrently is acceptable because it minimizes risk while allowing time for restoration before subjecting the unit to transients associated with shutdown.

The remaining OPERABLE DGs and offsite circuits are adequate to

. supply electrical power to the onsite Class 1E Distribution System. Thus, on a component basis, single failure protection for the required feature's function may have been lost; however, function has not been lost. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time takes into account the component OPERABILITY of the redundant counterpart to the inoperable required feature. Additionally, the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time takes into account the capacity and capability of the remaining AC sources, reasonable time for repairs, and low probability of a DBA occurring during this period .

• SUSQUEHANNA - UNIT 2 3.8-11

Rev. 15 AC Sources-Operating

• B 3.8.1 BASES ACTIONS B.3.1 and B.3.2 (continued)

Required Action B.3.1 provides an allowance to avoid unnecessary testing of OPERABLE DGs. If it can be determined that the cause of the inoperable DG does not exist on the OPERABLE DG, SR 3.8.1. 7 does not have to be performed. If the cause of inoperability exists on other DG(s), they are declared inoperable upon discovery, and Condition E of LCO 3.8.1 is entered. Once the failure is repaired, and the common

• cause failure no longer exists, Required Action B.3.1 is satisfied. If the cause of the initial inoperable DG cannot be determined not to exist on the remaining DG(s), performance of SR 3.8.1. 7 suffices to provide assurance of continued OPERABILITY of those DGs. However, the second Completion Time for Required Action B.3.2 allows a performance of SR 3.8.1.7 completed up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to entering Condition B to be accepted as demonstration that a DG is not inoperable due to a common cause failure.

In the event the inoperable DG is restored to OPERABLE status prior to completing eithe*r B.3.1 or B.3.2, the plant corrective action program will continue to evaluate the common cause possibility. This continued

• • evaluation, however; is no longer under the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> constraint imposed while in Condition B.

According to Generic Letter 84-15 (Ref. 8), 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is a reasonable time to confirm that the OPERABLE DGs are not affected by the same probiem as the inoperable DG.

According to Regulatory Guide 1.93 (Ref. 7), operation may continue iri Condition B for a period that should not exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. In Condition B, the remaining OPERABLE DGs and offsite circuits are adequate to supply electrical power to the onsite Class_1E Distribution System. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Completion Time takes into account the capacity and capability of.the remaining AC sources, reasonable time forrepairs, and low probability of a OBA occurring during this period .

• SUSQUEHANNA - UNIT 2 3.8-12

Rev. 15 AC Source.s-Operating B 3.8.1 BASES ACTIONS (continued)

Required Action C.1 addresses actions to be taken in' the event of concurrent inoperability of two offsite circuits. The Completion Time for Required Action C.1 is intended to allow the operator time to evaluate and repair any discovered inoperabilities.

According to Regulatory Guide 1.93 (Ref. 7), operation may continue in Condition C for a period that should not exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. This level of degradation means that the offsite electrical power system does not have the capability to effect a safe shutdown and to mitigate the effects of an accident; however, the onsite AC sources have not been degraded. This level of degradation generally corresponds to a total loss of the immediately accessible offsite power sources .

. Because of the normally high availability of the offsite sources, this* level of degradation may appear to be more severe than other combinations of two AC sources inoperable that involve one or more DGs inoperable.

However, two factors tend to *decrease the severity of this degradation

• level:

a. The configuration of the redundant AC electrical power system that remains available is not susceptible to a single bus or switching failure; and

b.

• The time required to detect and restore an unavailable offsite power source is generally much less than that required to detect and restore an unavailable onsite AC source .

. With both of the required offsite circuits inoperable, sufficient onsite AC sources are available to maintain the unit in a safe shutdown

• condition in the event of a OBA or transient. In fact, a simultaneous loss of offsite AC sources, a LOCA, and a worst case single failure

. were postulated as a part of the design basis in the safety analysis.

Thus, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Completion Time provides a period of time to effect restoration .of one of the offsite circuits commensurate with the importance of mai.ntaining an AC electrical power system capable of meeting *its design criteria. According to Regulatory Guide 1.93 (Ref. 7), with the available offsite AC sources two less than required by the LCO, operation may continue for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. If two offsite sources are restored within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, unrestricted

• operation may continue. If only one offsite source is restored within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, power operation continues in accordance with Condition A. "

SUSQUEHANNA - UNIT 2 3.8-13

Rev. 15 AC Sources-Operating

• • BASES ACTIONS D.1 and D.2 B 3.8.1 (continued)

Pursuant to LCO 3.0.6, the Distribution System Actions would not be entered even if all AC sources to it were inoperable, resulting in de-energization. Therefore, the Required Actions of Condition D are modified by a Note to indicate that when Condition* D is entered with no AC source to any ESS bus, Actions for LCO 3.8. 7, "Distribution Systems- .

Operating," must be immediately entered. This allows Condition D to provide requirements for the loss of the offsite circuit and one DG without regard to whether a division is de-energized. LCO 3.8.7 provides the appropriate restrictions for a de-energized bus.

According to Regulatory Guide 1.93 (Ref. 7), operation may continue in Condition D for a period that should not exceed 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. In Condition D, individual redundancy is lost in both the offsite electrical power system and the c;msite AC electrical power system. Since power system redundancy is provided by two diverse sources of power, however, the reliability of the power systems in this Condition may appear higher than

• that in Condition C (loss. of both required offsite circuits). This difference in reliability is offset by the susceptibility of this power system configuration to a single bus or switching failure. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Completion Time takes into account the capacity and capability of the remaining AC sources, reasonable time for repairs, and the low probability of a OBA occurring during this period.

With two or more DGs inoperable and an assumed loss of offsite electrical power, insufficient standby AC sources are available to power the minimum required ESF functions. Since the offsite electrical power system is the only source of AC power for the majority_ of ESF equipment at this level of degradation, the risk associated with continued operation for a very short time could be less than that associated with an immediate controlled shutdown. (The immediate shutdown could .cause grid instability, which could result in a total loss of AC power.) Since any

• inadvertent unit generator trip could also result in a total loss of offsite AC power, however, the time allowed for continued operation is severely restricted. The intent here is to avoid the risk associated with an immediate controlled shutdown and to minimize the risk associated with this level of degradation.

According to Regulatory Guide 1.93 (Ref. 7), with two or more DGs inoperable, operation may continue for a period that should not exceed 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> .

SUSQUEHANNA - UNIT 2 3.8-14

Rev. 15 AC Sources-Operating B 3.8.1 BASES ACTIONS F.1 and F.2

{ continued)

If the inoperable AC electrical _power sources cannot be restored to OPERABLE status within the associated Completion Time, 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 /> and to MODE 4within 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 plant conditions from full power conditions in an orderly manrier and without challenging plant systems.

G.1 Condition G corresponds to a level ofdegradation in which all redundancy in the AC electrical power supplies has been lost. At this severely degraded level; any further losses in the AC electrical power system will cause a loss of function. Therefore, no additional time is justified for continued operation. The unit is required by LCO 3.0.3 to commence a controlled shutdown.

SURVEILLANCE The AC so\,.lrces are designed to permit inspection and testing of all REQUIREMENTS important areas and features, especially those that have a standby function, in accordanc~ with 10 CFR 50, GDC 18 (Ref. 9). Periodic component tests are supplemented by extensive functional tests durin.g refueling outages (under simulated accident conditions). The SRs for demonstrating the OPERABILITY of the DGs are in accordance with the recommendations of Regulatory Guide 1.9 (Ref. 3), and Regulatory Guide 1.137 (Ref. 11 ), as addressed in the FSAR.

The Safety Analysis for Unit 2 assumes the OPERABILITY of some equipment that receives power from Unit 1 AC Sources. Therefore, Surveillance requirements are established for the Unit 1 onsite Class 1E AC electrical power distribution subsystem(s) required to support Unit 2 by LCO 3.8.7, Distribution Systems-Operating. As Noted at the beginning of the SRs, SR 3.8.1.1 through SR 3.8.1.20 are applicable to the Unit 2 AC sources and SR 3.8.1.21 is applicable to the Unit 1 AC sources.

SUSQUEHANNA - UNIT 2 3.8--:15

Rev. 15 AC Sources-Operatin g B 3.8.1 BASES SURVEILLANCE Where the SRs discussed herein specify voltage and frequency REQl.)IREMENTS tolerances, the following summary is applicable. The minimum steady *

(continued) state output voltage of 4000 V represents the value that will allow the degraded voltage relays to reset after actuation. This value is based on the upper value of the degraded voltage relay reset voltage of 3938 V, representing 94.68% of 4160 V, plus the worst-case voltage drop from the DG to an associated 4.16 kV switchgear bus. The specified maximum steady state output voltage of 4400 V is equal to the mc;tximum operating voltage specified for 4000 V. It ens1,.1res that for a lightly loaded distribution system, the voltage at the terminals of 4000 V motors is no more than the maximum rated operating voltages.

The minimum frequency value is derived from the recqmmendations found in Regulatory Guide 1.9 (Ref. 3). The allowable steady state frequency for all DGs is 60 Hz +/-2%. DG E is also required to maintain a frequency of not less than 57 Hz during transient conditions. To provide additional margin for DG E.to meet the 57 Hz criteria, the 2% margin allowed for steady state frequency is further reduced to 1%, or 0.6 Hz.

This value, added to the tol.erance allowed for the DG's electronic governor (0.1 Hz) provides the 59.3 Hz minimum frequency value applicable for all DGs .

The maximum frequency is derived from analysis based on an iterative approach using voltage and frequency variations of the DG to determine the maximum continuous loading on the DG such that the DG loading does not exceed its continuous rating and still performs its design function. Through a qualitative estimation and a dynamic transient simulation, the maximum frequency meeting the iterative approach is 60.5 Hz.

The Surveiilance Table has been modified by a Note, to clarify the testing requirements associated with DG E. The Note is necessary to define the intent of the Surveillance Requirements associated with the integration of DG E. Specifically, the Note defines that a DG is only considered OPERABL.,E and required when it is aligned to the Class 1E distribution system. For example, if DG A does not meet the requirements of a specific SR, but DG E is substituted for DG A and aligned to the Class 1E distribution system, DG E is required to be OPERABLE to satisfy the LCO requirement of 4 DGs and DG A is not required to be OPERABLE because it is not aligned to the Class 1E distribution system. This is acceptable because only 4 DGs are assumed in the event analysis.

Furthermore, the Note identifies when the Surveillance Requirements, as modified by SR Notes, have been met and performed, DG E can be SUSQUEHANNA - UNIT 2 3.8-16

Rev. 15 AC Sources-Operatin g

. B 3.8.1 BASES SURVEILLANCE substituted for any other DG and declared OPERABLE after performance REQUIREMENTS . of two SRs which verify switch alignment. This is acceptable because the

.'(continued) testing regimen defined in the Surveillance Requirement Table ensures DG E is fully capable of performing all DG requirements ..

SR 3.8.1.1 This SR ensures proper circuit continuity for the offsite AC electrical power supply to tlie onsite distribution network and availability of offsite AC electrical power. The breaker alignm~nt verifies that. each breaker is in its correct position to ensure that distribution buses and loads are connected to an Operable offsite power source and *that appropriate independence of offsite circuits is maintained. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program ..

SR 3.8.1.2 Not Used.

SR 3.8.1.3 This Surveillance verifies that the DGs are capable of synchronizing and accepting greater than or equal to the equivalent of the maximum expected ac~ident loads. A minimum run time of 60 minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

Although no power factor requirements are established by this SR, the DG is normally operated at a power factor between 0.8 lagging and 1.0.

The 0.8 value is the design rating of the machine, while 1.0 is an*

operational limitation to ensure circulating currents are minimized. The load band is provided to avoid routine overloading of the DG. Routine overloading may result in more frequent teardown inspections in .

• accordance with vendor recommendations in order to maintain DG OPERABILITY.

• Note 1 modifies this Surveillance to indicate that diesel engine runs for this Surveillance may include gradual loading, as recommended by the Cooper Bessemer Service Bulletin 728, so that mechanical stress and wear on the diesel engine are minimized .

• SUSQUEHANNA - UNIT 2 3.8-17 .

Rev. 15 AC Sources-Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.3 (continued)

REQUIREMENTS (continued) Note 2 moqifies this Surveillance by stating that momentary transients because of changing bus loads do not invalidate this test. Similarly; momentary power factor transients do not invalidate the test.

Note 3 indicates that this Surveillance should be conducted on only one DG at a time in order to avoid common cause failures that might result from offsite circuit or grid perturbations.

Note 4 stipulates a prerequisite requirement for performance of this SR.

A successful DG start must precede this test to credit satisfactory performance. .

Note 5 provides the allowance that DG E;. when not aligned as substitute

• for DG A, 8, C and D but being maintained available, may use the test facility to satisfy loading requirements in lieu of synchronization with an ESS bus.

Note 6 allows a single test (instead of two tests, one for each unit) to satisfy the requirements for both units, with the DG synchronized to the 4.16 kV ESS bus of Unit 1 for one periodic test and synchronized to the 4.16 kV ESS bus of Unit 2 during the next periodic test. This is acceptable because the purpose of the test is to demonstrate the ability of the DG to operate at its continuous* rating (with the exception of DG E which is only required to be tested at the continuous rating of DGs A thru D) and this attribute is tested at the required Frequency. Each unit's circuit breakers and breaker control circuitry, which are only being tested every second test (due to the staggering of the tests), historically have a very low failure rate. If a DG fails this Surveillance, the DG should be considered inoperable for both units, unless the cause of the failure can be directly related to only one unit. In addition, if the test is scheduled to be performed on the other Unit, and the other Unit's TS allowanGe that provides ari exception to performing the test is u.sed (i.e., the Note to SR 3.8.2.1 for the other Unit provides an exception to performing this test when the other Unit is in MODE 4 or 5, or moving irradiated fuel.

assemblies in the secondary containment), or it .is not possible to perform the test due to equipment availability, then the test shall be performed synchronized to this Unit's 4.16 kV ESS bus. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

• SUSQUEHANNA - UNIT 2 3.8-18

Rev. 15 AC Sources-Operating B 3.8.1 BASES SURVEILLANCE SR *3.8.1.4 REQUIREMENTS (continued) This SR verifies the level of fuel oil in the engine mounted day tank is at or above the level at which fuel oil is automatically added. The level is expressed as an equivalent volume in gallons, and is selected to ensure adequate fuel oil for a minimum of 55 minutes of DG A-D and 62 minutes of DG E operation at DG continuous rated load conditions.

The Surveillance _Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.5 Microbiological fouling is a major cause of fuel oil degradation. There are numerous bacteria that can grow in fuel oil" and cause fouling, but all must have a water environment in order to survive. Removal of water from the engine-mounted day tanks periodically eliminates the necessary environment for bacterial survival. This is the most effective means of controlling microbiological fouling. In addition, it eliminates the potential for water entrainment in the fuel oil during DG operation. Water may

-* come from ahy of several sources, including condensation, ground water, rain water, contaminated fuel oil, and breakdown of the fuel oil by bacteria. Frequent checking for and removal of accumulated water minimizes fouling and provides data regarding the watertight integrity of the fuel oil_ system. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.6 This Surveillance demonstrates that each required fuel oil transfer pump operates and transfers fuel oil from its associated storage tank to its associated day tank. It is required to support continuous operation of standby power sources. This Surveillance provides assurance_that the fuel oil transfer pump is OPERABLE, the fuel oil piping system is intact, the fuel delivery piping is not obstructed, and the controls and control systems for automatic fuel transfer systems are OPERABLE.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program .

• • SUSQUEHANNA - UNIT 2 3.8-19

Rev. 15 AC Sources-Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1-.7 REQUIREMENTS (continued) This SR helps to ensure the availability of the standby electrical power supply to mitigate D8As and transients and maintain the unit in a safe shutdown condition.

• To minimize the wear on nioving parts that do not get lubricated when the engine is not running, this SR has been modified by Note 1 to indicate that all DG starts forthese Surveillances may be preceded by an engine prelube period (which for DGs A through D includes operation of the lube oil system to ensure the DG's turbo charger is sufficiently prelubicated to prevent undo wear and tear).*

For the purposes of this testing, the DGs are started from standby conditions. Standby conditions for a DG mean that the diesel engine coolant and oil are being continuously circulated and temperature is being maintained consistent with manufacturer recommendations.

The DG starts from standby conditions and achieves the minimum required voltage and frequency within 1O seconds and maintains the

• • required voltage and frequency when steady state conditions are reached. The ten second start requirement support the assumptions in the design bases LOCA analysis of FSAR Section 6.3 (Ref. 12).

To minimize testing of the DGs, Note 2 allows a single test to satisfy the requirements for both units (instead of two tests, one for each unit). This is acceptable because this test is intended to demonstrate attributes of the DG that are not associated with either Unit. If the DG fails this Surveillance, the DG should be considered inoperable for both units, unless the cause of the failure can be directly related to one unit.

lihe time.for the DG to reach steady state operation is periodically monitored and the trend evaluated to identify degradation.

• The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.8 Transfer of each 4.16 kV ESS bus power supply from the normal° offsite circuit to the alternate offsite circuit demonstrates the OPERABILITY of the alternate circuit distribution network to power the. shutdown loads.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program .

SUSQUEHANNA - UNIT 2 3.8-20

. Rev. 15 AC Sources-Operating B 3.8.1

-BASES SURVEILLANCE SR 3.8.1.8 (continued)

REQUIREMENTS (continued)

• _This SR is modified by -a Note. The reason for the Note is that, during operation with the reactor critical, performance .of the automatic transfer of unit power supply could cause perturbations to the electrical distribution systems that could challenge continued steady state operation and, as a result, plant safety systems. The manual transfer. of unit power supply should not result in any perturbation to the electrical distribution system, therefore, no mode restriction is specified. This Surveillance tests the applicable logic associated with Unit 2. The comparable test specified in Unit 1 Technical Specifications tests the applicable logic associated with Unit 1. Consequently, a test must be performed within the specified Frequency for each unit. As the Surveillance represents separate tests, the Note specifying the restriction for not performing the test while the unit is in MODE 1 or 2 does not have applicability to Unit 1. The NOTE only applies to Unit 2, thus the Unit 2

• Surveillance shall not be performed with Unit 2 in MODE 1 or 2.

SR 3.8.1.9 Each DG is provided with an engine overl;lpeed trip to prevent damage to the engine. Recovery from the transient caused by the loss of a large load could cause diesel engine overspeed, which, if excessive, might result in a trip of the ~ngine. This Surveillance demonstrates the DG load response characteristics and capability to reject the largest single load without exceeding predetermined voltage and frequency and while maintaining a specified margin to the overspeed trip. The largest single load for each a DG is a residual heat removal (R.HR) pump (1425 kW).

This Surveillance may.be accomplished by:

a. Tripping the DG output breaker with the DG carrying greater than or equal to its associated single largest post-accident load while paralleled to offsite power, or while solely supplying the bus; or

b. Tripping its associated single largest post-accident load with the DG solely supplying the bus. *

. As recommended by Regulatory Guide 1.9 (Ref. 3), the load rejection test is acceptable if the increase in diesel speed does not exceed 75% of the difference between synchronous speed and the overspeed trip setpoint, or 15% above synchronous speed, whicheveris lower. For DGs A, B, C, D and E, this represents 64.5 Hz, equivalent to 75% of the difference between nominal speed and the overspeed trip setpoint.

• • SUSQUEHANNA - UNIT 2 3.8-21

Rev. 15 AC Sour.ces-Operating

• • BASES SURVEILLANCE SR 3,8.1.9 (Gontinued) 8 3.8.1 REQUIREMENTS (continued) The time, voltage, and frequency tolerances specified in this SR are derived from Regulatory Guide 1.9 (Ref. 3) recommendations for response during load sequence intervals. The 4.5 seconds specified is equal to 60% of the 7 .5 second load sequence interval between loading of thE! RHR and core spray pumps during an undervoltage on the bus concurrent with a LOCA. The 6 seconds specified is equal to 80% of that

. load sequence interval. The voltage and frequency specified are consistent with the design range of the equipment powered by the DG.

SR 3.8.1.9.a corresponds to the maximum frequency excursion, while SR 3.8.1.9.p and SR 3.8.1.9.c specify the steady state voltage and frequency values to which the system must recover following load

. rejE;)ction.

The Surveillance Frequency is controlled under the su*rveillance Frequency Control Program.

To minimiz13 testing of the DGs, a Note ailows a single test to satisfy the requirements .for both units (instead of two tests, one for each unit). This

• is acceptable because this test is intended to demonstrate attributes of the DG that are not associated with either Unit. If the DG fails this .

Surveillance, the DG should be considered inoperable for both units, unless the cause of the failure can be directly related to only one unit.

SR 3.8.1.10 This Surveillance demonstrates the oG* capability to reject a full load without overspeed tripping or exceeding the predetermined voltage limits. The DG full load rejection may occur because of a system fault or inadvertent breaker tripping. This *Surveillance ensures proper engine generator load response under the simulated test conditions.

This test simulates the loss of the total connected load that the DG experiences following a full load rejection and verifies that the DG .

does not trip upon loss of the load. These acceptance criteria provide DG damage protection. While the DG is not expected to experience this transient during an event, and continues to be available, this re.sponse ensures that the DG is not degraded for future application, including reconnection to the bus if the trip initiator can be corrected or isolated .

• SUSQUEHANNA - UNIT 2 3.8-22

Rev. 15 AC Sources-Ope rating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.10 (continued)

REQUIREMENTS (continued) To minimize testing of the DGs, a Note allows a single test to satisfy the requirements for both units (instead of two tests, one for each unit). This is acceptable because this test is intended to demonstrate attributes of the DG that are not associated with either Unit. If the DG fails this Surveillance, the DG should -be considered inoperable for both units, unless the cause of the failure can b~ directly related to only one unit.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.11 .

As required by Regulatory Guide 1.9 (Ref. 3), this Surveillance demonstrates the as designed operation of the standby power sources during loss of the offsite source. This test verifies all actions encountered from the loss of offsite power, including shedding of the nonessential loads and energization of the ESS buses and respective 4.16 kV loads from the DG. It further demonstrates the capability of the DG to

• automatically achieve and maintain the required voltage and frequency within the specified time. .

The DG auto-start tim*e of 10 seconds is derived from requirements of the licensed accident analysis for responding to a design basis large break LOCA. The Surveillance should be continued for a minimum of 5 minutes in order to demonstrate that all starting transients have decayed and

• stability has been achieved.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by three Notes. The reason for Note 1 is to minimize

• wear and tear on the DGs during testing. Note 1 allows all DG starts to be preceded by an engine prelube period (which for DG's A through D includes operation of the lube oil system to ensure the DGs turbo charger is sufficiently prelubricated).

• For the purpose of this testing, the DGs shall be started from standby conditions that is, with the engine oil being continuously circulated and engine coolant being circulated as necessary to maintain temperature consistent with m*anufacturer recommendc;1tions .

• • SUSQUEHAN NA - UNIT 2 3.8-23

Rev. 15 AC Sources-Ope rating B 3.8.1 BASES SURVEILLAN CE SR 3.8.1.11 (continued)

REQUIREME NTS (continued) The reason for Note 2 is that performing.the Surveillance would remove a required offsite circuit from service, perturb the electrical distribution system, and challenge safety systems. This Surveillance tests the .

applicable logic associated with Unit 2.

• The comparable test specified in the Un.it 1 Technical Specifications tests *the c:!pplicable logic associated with Unit 1. Consequently, a test must be performed w_ithin the specified Frequency for each unit. As the Surveillance represents separate tests, the Note specifying the restriction for not performing the test while the unit is in MODE 1, 2, or 3 does not have applicability to Unit 1. The Note only applies to Unit 2, thus the Unit 2 Surveillances shall not be performed with Unit 2 in MODES 1, 2 or 3.

This SR is also modified by Note 3. The Note specifies when this SR is required to be performed for the DGs and the 4.16 kV ESS. Buses. The Note is necessary because this SR involves an integrated test between the bGs and the 4.16 kV ESS Buses and the need for the testing regimen to include DG E being tested (substituted for all DGs for both units) with all 4.16 kV ESS Buses. To ensure the necessary testing is performed, the following rotational testing regimen has been established:

UNIT IN OUTAGE DIESEL E SUBSTITUTE D FOR 2 DG E not tested 1 Diesel Generator A 2 DG E not tested 1 DG E not tested 2 Diesel Generator B 1 Diesel Generator C 2 DG E not tested 1 DG E not tested 2 Diesel Generator D 1 DG I; not tested 2 DG E not tested 1 Diesel Generator B 2 DG E not teste<;I

• 1 DG E not tested 2 Diesel Generator A 1 Diesel Generator D 2 DG E not tested 1 DG E not tested 2 Diesel Generator C 1 DG E not tested SUSQUEHAN NA - UNIT 2 3.8-24

Rev. 15 AC Sources-Operatin g B 3.8.1

• BASES SURVEILLANCE SR 3.8.1.11 (continued)

REQUIREMENTS (continued)

• The specified rotational testing regimen can be altered to facilitate unanticipated events which render the testing regimenjmpractical to

. implement, but any alternative testing regimen must provide an equivalen.t level of testing.

This SR does not have to be performed with the normally aligned DG when the associated 4.16 kV ESS bus is tested using DG E and DG E does not need to be tested when not substituted or aligned to the Class 1E distribution system. The allowances specified in the Note are acceptable because the tested attributes of each of the five DGs and each unit's four 4.16 kV ESS buses are verified at the specified Frequency (i.e., each DG and each 4.16 *kV ESS bus is tested at a frequency controlled under the Sl!rveillance Frequency Control Program).

The testing allowances do result in some circuit pathways which do not need to change state (i.e., cabling) not being tested at the frequency established in accordance with the Surveillance Frequency Control Program. This is acceptable because these components are not required to change state to perform their safety function and when

• substituted-norma l operation of DG E will ensure continuity of most of the cabling not tested.

SR 3.8.1.12 This Surveillance demonstrates that the DG automatically starts and achieves the required voltage and frequency within the specified time (10 seconds) from the design basis actuation signal (LOCA signal) and operates for~ 5 minutes. The 5 minute period. provides sufficient time to demonstrate stability, SR 3.8.1.12.d and SR 3.8.1.12.e ensure that permanently connected loads and emergency loads are energized from the offsite electrical power system on a l-OCA signal without loss of offsite power.

The requirement to verify the connection and power supply of permanent and auto connected loads is intended to satisfactorily show the relationship of these loads to the loading logic for loading onto offsite power. In certain circumstances, many of these loads cannot actually be connected or loaded without undue hardship or potential for *undesired operation. For instance,. ECCS injection valves are not desired to be stroked open, high pressure injection $ystems are not capable of being operated at full flow, or RHR systems performing a decay heat removal function are not desired to be realigned to the ECCS mode of operation.

In lieu of actual demonstration of the connection and loading of these

• loads, testing that adequately shows the capability of the DG system to perform these functions is acceptable.

SUSQUEHANNA - UNIT 2 3.. 8-25

Rev. 15 AC Sources-Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.12 (continued)

REQUIREMENTS (continued) This testing may include any series of sequential, overlapping, or total .

steps so that the entire connection and loading sequence is verified.

SR 3.8.1.12.a through SR 3.8.1.12.d are performed with the DG running.

_SR 3.8.1.12.e can be performed when the DG is not running.*

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by two Notes. The reason for Note 1 is to minimize wear and tear on the DGs during testing. Note 1 allows all DG starts to be preceded by an engine prelube period (which for DGs A through D includes operation of the lube oil system to ensure the DG's turbo chprger is sufficiently prelubricated). For the purpose of this: testing, the DGs must be started froin standby conditions, that is, with the engine oil being continuously circulated and engine coolant being circulated as necessary to maintain temperature consistent with manufacturer recommendations. *

• The reason for Note 2 is to allow DG E, when not aligned as substitute for DG A, B, C or D, to use the test facility to satisfy loading requirements in lieu of aligning with the Class 1E distribution system. When tested in this configuration, DG E satisfies the requirements of this test by completion of SR 3.8.1.12.a, b and c only. SR 3.8.1.12.d and 3.8.1.12.e may be performed by any DG aligned with the Class 1E distribution system or by any series of sequential, overlapping, or total steps so that the entire connection and loading sequence is verified.

SR 3.8.1.13 This Surveillance demonstrates that DG non-critical protective functions (e.g., high jacket water temperature) are bypassed on an ECCS initiation test signal. The non:.critical trips are bypassed during DBAs and provide an alarm on an abnormal engine condition. This alarm provides the operator with sufficient time to react ?ppropriately. The DG availability to mitigate the OBA is more critical than protecting the engine against minor problems that are not immediately detrimental to emergency operation of the DG.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program .

• • SUSQUEHANNA - UNIT 2 3.8-26

Rev. 15 AC Sources-Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.13 (continued)

REQUIREMENTS (continued) The SR is modified by two Notes. To minimize testing of the DGs, Note 1 to SR 3.8.1.13 allows a single test (instead of two tests, one for each unit) to satisfy the requirements for both units. This is acceptable because this test is intended to dernonstrate attributes of the DG that are not associated with either Unit. If the DG fails this Surveillance, the .DG should be considered inoperable for both units, unless the cause of the failure can be directly related to only one unit.

Note 2 provides the allowance that DG E, wl)en n.ot aligned as a substitute for DG A, B, C, and D but being maintained available, may use a simulated ECCS initiation signal.

SR 3.8.1.14 Regulatory Guide *1.9 (Ref. 3), requires demo.nstration periodically that the DGs can start and run continuously at full load capability for an interval of not less than 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s-22 hours of which is at a load equivalent to 90%

to 100% of the continuous rating of the DG, and 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of which is at a *

• load equivalent to 105% to 110% of the continuous duty rating of the DG.

SSES has taken exception to this requirement and performs the two hour run at the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating for each DG. The requirement to perform the two hour overload test can be performed in any order provided it is performed during a single continuous time period.

The DG starts for this Surveillance can be performed either from standby or hot conditions. The.provisions for prelube discussed in SR 3.8.1.7, and for gradual loading, discussed,LQ SR 3.8.1.3, are applicable to this SR.

• A load band is provided to avoid routine overloading of the DG. Routine overloading may result in more frequent teardown inspections in accordance with vendor recommendations in order to maintain DG OPERABILITY.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

Th_is Surveillance has been modified by three Notes. Note 1 states that momentary transients due to changing bus loads do not invalidate this test.

• SUSQUEHANNA- UNIT 2 3.8-27

Rev. 15 AC Sources-Operating

• • BASES SURVEILLANCE REQUIREMENTS SR 3.8.1.14 (continued)

B 3.8.1 (continued) To minimize testing of the DGs, Note 2 allows a single test (instead of two tests, one for each unit) to satisfy the requirements for both units. This is acceptable because this test is intended to demonstrate attributes of the DG that are not associated with either Unit. If the DG fails this Surveillance, the DG should be considered inoperable for both units, unless the cause of the failure can be directly related to only one unit.

Note 3 stipulates that DG E, when not aligned as substitute for DG A, B, C or D but being maintained available may use the test facility to satisfy the specified loading requirements in lieu of synchronization with an ESS bus.

SR 3.8.1.15 This Surveillance demonstrates that"the diesel engine can restart from a hot condition, such as subsequent to shutdown from full load temperatures and achieve the required voltage and frequency within 10 seconds. The 10 second time is *derived from the requirements of

• the accident analysis to respond to a design basis large break LOCA.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by three Nc:ites. Note 1 ensures that the test is performed with the diesel sufficiently hot. The requirement that the diesel has operated for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at full load conditions prior to performance of this SurveillanGe is based on manufacturer recommendations for achieving hot.conditions. The load band is provided to avoid routine overloading of the DG. Routine overloads may

• result in more frequent teardown inspections in accordance with vendor recommendations in order to maintain DG OPERABILITY. Momentary transients due to changing bus loads do not invalidate this test.

Note 2 allows all bG starts to be preceded by an engine prelube period (which for bGs A through D includes operation of the lube oil system to ensure the DG's turbocharger is sufficiently prelubricated) to minimize wear and tear on the diesel during testing.

To minimize testing of the DGs, Note 3 allows a single test to satisfy the requirements for both units (instead of two tests, one for each unit). This is acceptable because this test is intended to demonstrate attributes of the DG that are not associated with either Unit. If the DG fails this

• Surveillance, the DG should be considered inoperable for both units, unless the cause of the failure can be directly related to only one unit.

• sUSQUEHANNA -* UNIT 2 3.8-28

Rev. 15 AC Sources-Ope rating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.16 REQUIREMENTS (continued) As required by Regulatory Guide 1.9 (Ref. 3), this Surveillance ensures that the manual synchronization and automatic load transfer from the DG to the offsite source can be made and that the DG can be returned to ready-to-load status when offsite power is restored. It also ensures that the auto-start logic is reset to allow the DG to reload if a subsequent loss of offsite power occurs. The DG is considered to be in ready-to-load status when the DG is at rated speed and voltage, the DG controls are in isochronous and the output breaker is open.

In order to meet this Surveillance Requirement, the Operators must have the capability to manually transfer loads from the D/Gs to the offsite sources. Therefore, in order to accomplish this transfer and meet this

• Surveillance Requirement, the synchronizing selector switch must be functional. (See ACT-1723538).

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

• • This SR is modified by a note to accommodate the testing regimen necessary for DG E. See SR 3.8.1.11 for the Bases of the Note.

SR 3.8.1.17 Demonstration of the test mode override ensures that the DG availability under accident conditions is not compromised as the result of testing.*

Interlocks to the LOCA sensing circuits cause the DG to automatically reset to ready-to-load operation if an ECCS initiation signal is received.

during operation in the test mode. Ready-to-load operation is defined as the DG running at rated speed and voltage, the DG controls in isochronous, and the DG output breaker open. These provisions for automatic switchover are required by IEEE-308 (Ref. 10),

paragraph 6.2.6(2).

The requirement to automatically energize the emergency loads with offsite power is essentially identical tc:i that of SR 3.8.1.12. The intent in the requirements associated with SR 3.8.1.17.b is to show that the emergency loading is not affected by the DG operation in test mode. In lieu of actual demonstration of connection and loading of loads, testing that adequately shows the capability of the emergency loads to perform these functions is acceptable. This test is performed by verifying that after the DG is tripped, the. offsite source originally in parallel with the DG, remains connected to the affected 4.16 kV ESS Bus. SR 3.8.1.12 is performed separately to verify the proper offsite loading sequence.

SUSQUEHA NNA- UNIT 2 3.8-29

Rev. 15 AC Sources-Operating B 3.8.1 BASES SURVEILLANCE SR 3.8.1.17 (continue.ct) .

REQUIREMENTS (continued) The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by a note to accommodate the testing regimen necessary for DG E. See SR 3.8.1.11 for the Bases of the Note.

SR 3.8.1.18 Und~r accident conditions, loads are sequentially connected to the bus by individual load timers which control the permissive and starting signals to motor breakers to prevent overloading* of the AC Sources due to high motor- starting currents. The load sequence time interval tolerance ensures that sufficient time exists for the AC Source to restore frequency and voltage prior to applying the next load and that safety analysis assumptions regarding ESF equipment time delays are not violated.

Reference 2 provides a summary of the autoniatic loading of ESS buses.

A list of the required timers and the associated setpoints are included in the Bases as Table B 3.8.1-1, Unit 1 and Unit 2 Load Timers. _Failure of a

• timer identified as an offsite power timer may result in both offsite sources inoperable. Failure of any other timer may result in the associated DG being inoperable. A timer is considered failed for this SR if it will not ensure that the associated load will energize within the Allowable Value specified in Table B 3.8.1-1. These conditions will require entry into applicable Condition of this specification. With a load timer inoperable, the load can be rendered inoperable to restore OPERABILITY to the associated AC sources. In this condition, the Conditions and Required Actions of the associated specification shall be entered for the equipment rendered inoperable.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by a Note that specifies that load timers associated with equipment that has automatic initiation capability disabled are not required to be Operable. This is acceptable because if the load does not start automatically, t~e adverse effects of an improper loading sequence are eliminated .. Furthermore, load timers are associated with individual timers such that a single timer only affects a single load .

• SUSQUEHANNA - UNIT 2 3.8-30

Rev. 15 AC Sources-Operatin g B 3.8.~

BASES SURVEILLANCE

• SR 3.8.1.19 REQUIREMENTS (continued) In the event of a OBA coincident with a loss of offsite power, the DGs are required t_o supply the necessary power to ESF systems $0 that the fuel, RCS, and containment design limits are not exceeded.

This Surveillance demonstrates DG operation, as discussed in the Bases

. for SR 3.8.1.11, during a loss of offsite power actuation test signal in conjunction with an ECCS initiation signal. In lieu of actual demonstration

• of connection and loading of loads, testing that adequately shows the capability of the DG system to perform these functions is acceptaple.

This testing may include any series of sequential, overlapping, or total steps so that the entire connection and loading sequence is verified. To simulate the non-LOCA unit 4.16 kV ESS Bus loads on the DG, bounding foads are energized on the_ tested 4.16 kV ESS Bus after all auto

• connected emergency loads are energized.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by three Notes. The reason for Note 1 is to minimize wear and tear on the DGs during testing. Note 1 allows all DG starts to be preceded by an engine prelube period (which for DGs A through D includes operation of the lube oil system to ensure the DG's turbo charger

• is sufficiently prelubricated). For the purpose *of this testing, the DGs must be started from standby conditions, that is, with the engine oil being continuously circulated and engine coolant being circulated as necessary to maintain te_mperature consistent with manufacturer recommendations Note 2 is necessary to accommodate the testing regimen associated with DG E. See SR 3.8.1.11 for the Bases of the Note.

The reason for Note 3* is .that performing the Surveillance would remove a required offsite circuit from service, perturb the.electrical distribution system, and challenge safety systems. This Surveillance tests the applicable logic associated with Unit 2. The comparable test specified in

.the Unit 1 Technical Specifications tests the applicable logic associated with Unit 1. Consequently, a test must be performed within the specified Frequency for each unit. As _the Surveillance represents separate tests, the Note specifying the restriction for not performing the test while the unit

• is in MODE 1, 2 or 3 does not have applicability to Unit 1. The Note only applie? to Unit 2, thus the Unit 2 Surveillances shall not be performed .

with Unit 2 in MODE 1, 2 or 3 .

• SUSQUEHANNA - UNIT 2 3.8-31

Rev. 15 AC Sources-Operatin g

• • • BASES SURVEILLANCE SR 3.8.1.20 B 3.8.1 REQUIREMENTS (cpntinued) This Surveillance demonstrates.that the DG starting independence has not been compromised. Also, this Surveillance demonstrates that each engine can achieve proper speed within the specified time when the DGs are started simultaneously. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

This SR is modified by two Notes. The reason for Note 1 is to minimize wear on the DG during testing. The Note allows all DG starts to be

.preceded by an engine prelube period (which for DGs A through D.

in<;:ludes operation of the lube oil system to ensure the DG's tl,irbo charger is sufficiently prelubricated.) For the purpose of this testing, the DG's

• must be started from standby conditions, that is, with the engine oil continuously circulated *and engine coolant being circulated as necessary to maintain temperature consistent with manufacturer recommendations.

Note 2 is necessary to identify that this test does not have to be performed with DG E substituted for any DG. The allowance is acceptable based on the design of the DG E transfer switches. The transfer of control, protection, indication, and alarms is by switches at two separate location~. These switches provide a double break between DG E and the redundant system within the transfer switch panel. The

• transfer of power is through circuit breakers at two separate locations for each redundant system. There are four normally empty switchgear positions at DG E facility, associated with each of the four existing DGs.

Only one circuit breaker is available at this location to be inserted into one of the four positions. At each of the existing DGs, there are two

• switchgear positions with only one circuit breaker available. This design provides two open circuits between redundant power sources. Therefore, based on the described design, it can- be concluded that DG redundancy and independence is maintained regardless of whether DG E is substituted for any other DG .

• • SUSQUEHANNA - UNIT 2 3.8-32

Rev. 15 AC Sources-Operatin g B 3.8.1 BASES.

SURVEILLANCE SR 3.8.1.21 REQUIREMENTS (continued) This Surveillance is provided to direct that the appropriate Surveillances for Unit 1 AC sources required to support Unit 2 are governed by the Unit 2 Technical Specifications. With the exception of this Surveillance, all other Surveillances of this Specification (SR 3.8.1.1 through

.SR 3.8.1.20) are applicable to the Unit 2 AC sources only. Meeting the SR requirements of Unit 1 LCO 3.8.1 will satisfy all Unit 2 requirements for Unit 1 AC sources. However, six Unit 1 LCO 3.8.1 SRs, if not required to support Unit 1 OPERABILITY requirements, are not required when demonstrating Unit 1 sources are capable of supporting Unit 2 ..

SR 3.8.1.8 is not required if only one Unit 1 offsite .circuit is required by the Unit 2 Specification. SR 3.8.1.12, SR 3.8.1.13, SR 3.8.1.17, and

• SR 3.8.1.19 are not required since these SRs test the Unit 2 ECCS initiation signal, which is not needed for the AC sources to be OPERABLE on Unit 2. SR 3.8.1.20 .is not r$quired since starting independence is not required with the DG(s) not required to be OPERABLE.

The Frequency required by the applicable Unit 1 SR also governs performance of that SR for Unit 2.

• As Noted, if Unit 1 is in MODE 4 or 5, the Note to Unit 1 SR 3.8.2.1 is applicab.le. This ensures that a Unit 2 SR will not require a Unit 1 SR to be performed, when the Unit 1 Technical Specifications do not require performance of a Unit 1 SR. (However, as stated in the Unit 2 SR 3.8.2.1 Note, while performance of an SR is not required, the SR still must be met) .

• SUSQUEHANNA - UNIT 2 3.8-33

Rev. 15 AC Sources-Operating B 3.8-.1 BASES REFERENCES 1.- 10 CFR 50, Appendix A, GDC 17.

2. FSAR, Section 8.2.

3. Regulatory Guide 1.9.

4. FSAR, Chapter 6.

5. FSAR, Chapter 15.

6. Final Policy Statement on Technical Specifications Improvements, July 22, 1993 (58 FR 39132).

7. Regulatory Guide 1.93.

8. Generic Letter 84-15.

9. 10 CFR 50, Appendix A, GDC 18.

10 . IEEE Standard 308.

• 11.

12.

13.

Reg!,.llatory Guide 1.137.

FSAR, Section 6.3.

ASME Boiler and Pressure Vessel Code,Section XI.

14. Letter from R. V. Guzman (USNRC) to B. T. McKinney (PPL)

"Susquehanna Steam Electric Station, Unit 2 - Issuance of Amendment Re: Electrical Power Systems Technical Specification 3.8.1 (T.A.C. MD4766)", dated February 19, 2008.

SUSQUEHANNA - UNIT 2 3.8-34

Rev. 15 AC Sources-Operating B 3.8.1 TABLE B 3.8.1-1 (page 1 of 2)

UNIT 1 AND UNIT 2 LOAD TIMERS NOMINAL DEVICE SETTING ALLOWABLE TAG NO. SYSTEM LOADING TIMER LOCATION (seconds) VALUE (seconds) 62A-20102 RHR Pump 1A 1A201 3 2:: 2.7 ands 3.6 62A-20202 RHR Pump 1B 1A202 3 > 2.7 and< 3.6 62A-20302 RHR Pump 1C 1A203 3 2:: 2.7 and< 3.6 62A-20402 RHR Pump 1D 1A204 3 2:: 2.7 and < 3.6 62A-20102 RHRPump2A 2A201 3 2:: 2.7 and s 3.6 62A-20202 RHRPump2B 2A202 .3 2:: 2.7 ands 3.6 62A-20302 RHRPump2C 2A203 3 2:: 2.7 ands 3.6 62A-20402 RHRPump2D 2A204 3 2:: 2.7 and s 3.6 E11A-K202B RHR Pump 1C (Offsite Power Timer) 1C618 7.0 2:: 6.5 ands 7.5 E11A-K120A RHR Pump 1C (Offsite Power Timer-) 1C617 7.0 2:: 6.5 and< 7.5 E11A-K120B RHR Pump 1D (Offsite Power Timer) 1C618 7.0 2:: 6.5 and< 7.5 E11A-K202A RHR Pump 1D (Offsite Power Timer) 1C617 7.0 > 6.5 and< 7.5 E11A-K120A RHR Pump 2C (Offsite Power Timer) 2C617 7.0 2:: 6.5 and< 7.5 E11A-K202B RHR Pump 2C (Offsite Power Timer) 2C618 7.0 > 6.5 and< 7.5 E11A-K120B RHR Pump 2D (Offsite Power Timer) 2C618 7.0 > 6.5 and< 7.5 E11A-K202A RHR Pump 2D (Offsite Power Timer) 2C617 7.0 > 6.5 and< 7.5 E21A-K116A CS Pump 1A 1C626 10.5 2:: 9.4 and s 11.6 E21A-K116B CS Pump 1B 1C627 10.5 2:: 9.4 and s 11.6 E21A-K125A CS Pump 1G 1C626 10.5 2:: 9.4 and s 11.6 E21A-K125B CS Pump 1D 1C627 10.5 2:: 9.4 and s 11.6 2C626 10.5 2:: 9.4 and s 11.6 E21A-K116A CS Pump2A E21A-K116B CS Pump2B 2C627 10.5 > 9.4 and < 11.6 E21A-K125A CS Pump2C 2C626 10.5 2:: 9.4 ands 11 .. 6 E21A-K125B CS Pump2D 2C627 10.5 2:: 9.4 and s 11.6 E21A-K16A CS Pump 1A (Offsite Power Timer) .1C626 15 2:: 14.0 and S 16.0 E21A-K16B CS Pump 1B (Offsite Power Timer) 1C627 15 > 14.0 and< 16.0 E21A-K25A CS Pump 1C (Offsite Power Timer) 1C626 15 2:: 14.0 and S 16.0 E21A-K25B

• CS Pump 1D (Offsite Power Timer) 1C627 15 > 14.0 and< 16.0 E21A-K16A CS Pump 2A (Offsite Power Timer) 2C626 15 2:: 14.0 and< 16.0 E21A-K16B CS Pump 2B (Offsite Power Timer) 2C627 15 > 14.0 and< 16.0 E21A-K25A CS Pump 2C (Offsite Power Timer) 2C626. 15 2:: 14.0 and< 16.0 E21A-K25B CS Pump 2D (Offsite Power Timer) 2C627 15 > 14.0and < 16.0 62AX2-20108 Emergency Service Water 1A201 40 2:36 and $44 62AX2-20208 Emeraency Service Water 1A202 40 2:36 and <44 62AX2-20303 Emeraency Service Water 1A203 44 2:: 39.6 and < 48.4 62AX2-20403 Emeraency Service Water 1A204 48 2:: 43.2 and < 52.8 62X3-20404 Control Structure Chilled Water System OC877B 60 >54 62X3-20304 Control Structure Chilled Water Svstem OC877A 60 >54 Emergency Switchgear Rm Cooler A & RHR 62X-20104 OC877A 60 2:54 SW Pump H&V Fan A Emergency Switchgear Rm Cooler B & RHR 60 62X-20204 OC877B 2:54 SW Pumo H&V Fan B 62X-5653A DG Room Exhaust Fan E3 OB565 60 * >54 62X-5652A DG Room Exhausts Fan E4 OB565 '60 >54 262X-20204 Emeraencv Switchaear Rm Cooler B OC877B 120 2:54 262X-20104 Emeraency Switchaear Rm Cooler A OC877A 120 2:54 62X-546 DG Rm Exh Fan o* OB546 120 2:54

• SUSQUEHANNA - UNIT 2 3.8-35

Rev. 15 AC Sources-Operating B 3.8.1 TABLE B 3.8.1-1 (page 2 of2)

UNIT 1 AND UNIT 2 LOAD TIMERS NOMINAL DEVICE SETTING ALLOWABLE TAG NO. SYSTEM LOADING TIMER LOCATION (seconds) VALUE (seconds) 62X-536 DG Rm Exh Fan C OB536 120 2: 54 62X-526 DG Rm Exh Fan B OB526

• 120 2: 54 62X-516 DG Rm Exh Fan A OB516 120 2: 54 CRX-5652A DG Room Supply Fans E1 and E2 OB565 120 2: 54 62X2-20410 Control Structure Chilled Water System OC876B 180 2: 54 62X1-20304 Control Structure Chilled Water System OC877A 180 2: 54 62X2-20310 Control Structure Chilled Water System OC876A 180 2: 54 62X1-20404 Control Structure Chilled Water System OC877B. 180 2: 54 62X2-20304 Control Structure Chilled Water System OC877A 210 2: 54 62X2-20404 Control Structure Chilled Water System OC877B 210 2: 54 Emergency Switchgear Rm Cooling 2: 54 62X-K11BB 2CB250B 260 Compressor B Emergency Switchgear Rm Cooling 2: 54 62X-K11AB 2CB250A 260 Compressor A

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