ML20129J913

Technical Specification Bases, Unit 1, Manual

ML20129J913
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Site:	Susquehanna
Issue date:	04/23/2020
From:	Susquehanna
To:	Document Control Desk, Office of Nuclear Reactor Regulation
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Download: ML20129J913 (15)

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• MANUAL HARD COPY DISTRIBUTION DOCUMENT TRANSMITTAL 2020-7224 USER INFORMATION:

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• Address: NUCSA2 Phone#: 542-3194 TRANSMITTAL INFORMATION:

TO: GERLACH*ROSEY M 04/23/2020 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:" REPLKCE 11-a.Yrecti-orrs-d'o-rrot-afLect-the-Ta-b:l-e-of-eontents-,Therefore--no- ~ - - - - - ~ -

TOC will be issued with the updated material.

TSBl - TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL REMOVE MANUAL TABLE OF CONTENTS DATE: 04/21/2020 ADD MANUAL TABLE OF CONTENTS DATE: 04/22/2020 CATEGORY: DOCUMENTS TYPE: TSBl

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• ID: TEXT 3.6.3.2 REMOVE : REV: 3 ADD: REV: 4 ANY DISCREPANCIES WITH THE MATERIAL PROVIDED, CONTACT DCS@ X3171 OR X3194 FOR ASSISTANCE. UPDATES FOR HARDCOPY MANUALS WILL BE DISTRIBUTED WITHIN 3 DAYS IN ACCORDANCE 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: TSBl

.Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL Table Of Contents Issue Date: 04/22/2020 Procedure Name Rev Issue Date Change ID change Number TEXT LOES 134 01/03/2019

Title:

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

Title:

TABLE OF CONTENTS TEXT 2 .1.1 6 01/22/2015

Title:

SAFETY LIMITS (SLS) REACTOR CORE SLS TEXT 2.1.2 1 TEXT 3*.1.1 TEXT.3.1.2 TEXT 3.1.3 TEXT 3 .1.4 5 11/16/2016

Title:

REACTIVITY CONTROL SYSTEMS CONTROL ROD SCRAM TIMES

• TEXT 3. i. 5 2 11/16/2016 Ti.tle: . REACTIVITY CONTROL SYSTEMS CONTROL ROD SCRAM ACCUMULATORS TEXT 3 .1. 6 4 11/16/2016

Title:

REACTIVITY CONTROL SYSTEMS ROD PATTERN CONTROL

• Page 1. of 8 Report Date: 04/22/20

SSES MANUAL Manual Name: TSBl Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL TEXT 3~1.7 4 11/16/2016

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 3 11/16/2016

Title:

POWER DISTRIBUTION LIMITS AVERAGE PLANAR LINEAR HEAT GENERATION RA,TE (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)

TEXT 3 . 3 . 1. 1 TEXT 3.3.1.2 7

4 11/16/2016

Title:

INSTRUMENTATION REACTOR PROTECTION SYSTEM (RPS) INSTRUMENTATIO~

01/23/2018

Title:

INSTRUMENTATION SOURCE RANGE MONITOR (SRM) INSTRUMENTATION TEXT 3.3.2.1 5 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.l 10 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 ~ 11/16/2016

Title:

INSTRUMENTATION END OF CYCLE RECIRCULATION PUMP TRIP (EOC-RPT) INSTRUMENTATION Page 2 of 8 Report Date: 04/22/20

SSES MANUAL Manual Name: TSBl Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL TEXT 3 .3 A .2 1 11/16/2016

Title:

INSTRUMENTATION ANTICIPATED TRANSIENT WITHOUT.SCRAM RECIRCULATION PUMP TRIP (ATWS-RPT) INSTRUMENTATION TEXT 3.3.5.1 5 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 T.EXT 3 . 3 . 5 . 3 0 03/05/2019

Title:

INSTRUMENTATION REACTOR CORE ISOLATION COOLING (RCIC) SYSTEM INSTRUMENTATION

• • PREVIOUSLY TEXT 3.3.5.2 REV 1**

TEXT 3.3.6:1 9. 03/05/2019

Title:

INSTRUMENTATION PRIMARY CONTAINMENT ISOLATION INSTRUMENTATION

• TEXT 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 EME~GENCY OUTSIDE AIR SUPPLY (CREOAS.) SYSTEM INSTRTJMENTATION TEXT 3.3.8.l 3 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

• Page 3 of s Report Date: 04/22/20

SSES MANUAL Manual Name: TSBl Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL TEXT 3.4.4 1 11/16/2016

'1'.itle: REACTOR COOLANT.SYSTEM (RCS) RCS OPERATIONAL LEAKAGE TEXT 3.4.5 2 04/13/2016

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 TEXT 3.4.9 TEXT 3.4.10

• - COLD SHUTDOWN 2

6

• 11/16/2016

Title:

REACTOR COOLANT SYSTEM (RCS) RESIDUAL HEAT REMOVAL (RHR) SHUTDOWN COOLING SYSTEM 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 3 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: 04/22/20

SSES MANUAL Manual Name: TSBl

• Manual

Title:

TECHNICAL SPECIFICATION BASES*UNIT 1 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 16 03/03/2020

Title:

CONTAINMENT SYSTEMS PRIMARY CONTAINMENT ISOLATION VALVES (PCIVS)

TEXT 3 . 6 . 1. 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 TEXT 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 POOL 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. PRIMARY CONTAINMENT HYDROGEN RECOMBINERS TEXT 3.6.3.2 4 04/22/2020

Title:

CONTAINMENT SYSTEMS DRYWELL AIR FLOW SYSTEM Page 5 of 8 Report Date: 04/22/20

~I SSES MANUAL

'Manual Name: TSBl Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL TEXT 3.6.3.3 3 09/29/2017

Title:

CONTAINMENT SYSTEMS PRIMARY CONTAINMENT OXYGEN CONCENTRATION TEXT 3.6.4.1 15 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 6 03/03/2020

Title:

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

TEXT 3.7.2 4 03/03/2020.

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 11ii6/20lq

Title:

PLANT SYSTEMS MAIN CONDENSER OFFGAS TEXT. 3.7.6 3 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:

PLANT. SYSTEMS Page 6 of 8 Report Date: 04/22/20

• • ~

SSES MANUAL Mariual Name: TSBl Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 MANUAL TEXT 3. 8 *.1 13 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 SYSTEMS DC SOURCES - OPERATING TEXT 3.8.5 2 03/05/2019

Title:

ELECTRICAL POWER SYSTEMS DC SOURCES - SHUTDOWN

• TEXT 3.8.6 TEXT 3.8.7 2

3 11/16/2016

Title:

ELEGTR*ICAL POWER SYSTEMS BATTER.y**cE;LL PARAME'!'-ER"S- -::... __ ,.

09/04/2019

Title:

ELECTRICAL POWER SYSTEMS DISTRIBUTION SYSTEMS - OPERATING

. _...,_ *-*~

--- . .'i:f:i-:~;:-.-.. _.,;. ..

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 11/15/2002

Title:

REFUELING OPERATIONS CONTROL ROD POSITION INDICATION Page 7 of 8 Report Date: 04/22/20

I r SSES MANUAL Manual Name: TSBl Manual

Title:

TECHNICAL SPECIFICATION BASES UNIT 1 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

Title:

REFUELING OPERATIONS.RESIDUAL HEAT REMOVAL (RHR) - HIGH WATER LEVEL TEXT 3.9.8 1 11/16/2016

Title:

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

Title:

• sPECIAL OPERATIONS INSERVICE LEAK AND HYDROSTATIC TESTING OPERATION TEXT 3.10.2 1 11/16/2016

Title:

SPECIAL OPERATIONS REACTOR MODE SWITCH. INTERLOCK TESTING

'.J:'EXT 3 .10. 3 1 11/16/2016

Title:

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

Title:

SPECIAL OPERATIONS SINGLE CONTROL ROD WITHDRAWAL - COLD SHUTDOWN -

TEXT 3.10.5 1 11/16/2016

Title:

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

Title:

SPECIAL OPERATIONS MULTIPLE CONTROL ROD WITHDRAWAL - REFUELING TEXT 3.10.7 1 04/18/2006*

Title:

SPECIAL OPERATIONS CONTROL ROD TESTING - OPERATING TEXT 3.10.8 2 11/16/2016

Title:

SPECIAL OPERATIONS SHUTDOWN MARGIN *(SDM) TEST - REFUELING Page 8 of 8 Report Date: 04/22/20

Rev.A Drywell Air Flow System B 3.6.3.2

• 83.6 CONTAINMENT SYSTEMS B 3:6.3.2 Drywell Air Flow System BASES BACKGROUND The Drywell Cooling fans in low speed ensure a uniformly mixed post accident primary containment atmosphere (Ref. 1), thereby minimizing the potential for local hydrogen burns due to a pocket of hydrngen above the flammable concentration.

The Drywell Cooling fans are an Engineered Safety Feature and are designed to withstand a loss of coolant accident (LOCA) in post accident environments without loss of function. The system consists of three required pairs of fans with each pair consisting of two independent fans. The three required Drywell Cooling fan pairs are as follows:

a. Drywell Unit Cooler fans *1 V414A/1 V4148;

, *. b.* Drywell Unit Cooler fans 1V416A/1V4168;

c. Recirculation fan 1V418A/1V4188.

The fans are initiated manually since flammability limits would not be reached until several days after a LOCA. Each fan in a pair is powered from a separate emergency power supply. Since one fan in each pair can provide.

100% of the mixing requirements, the system will provide its design function with a worst case single active failure.

APPLICABLE The Di"ywell Cooling fans provide the capability for reducing the local' SAFETY hydrogen concentration to approximately the bulk average concentration ANALYSES following a Design Basis Accident (OBA).

Reference 2 no longer defines a design basis hydrogen source term and therefore no design basis calculates hydrogen generation as a function *of time. See Reference 3 for a detailed discussion for hydrogen gene*ration.

Although natural circulation phenomena reduces the gradient concentration differences in containment, a containment mixing system provides further means of preventing local hydrogen gas buildups in containment post-accident.

The Drywell Cooling fans satisfy Criterion 3 of the NRC Policy Statement.

(Ref. 4)

SUSQUEHANNA - UNIT 1 3.6-76

Rev.4 Drywell Air Flow System B 3:6.3.2 BASES LCO Three required Drywell Cooling fan pairs must be OPERABLE in low speed to ensure operation of at least one fan in each of the required pairs in the event of a worst case single active failure. The three required Drywell

• Cooling fan pairs are as follows:

a. Drywell Unit Cooler fans 1V414A/1V414B;

b. Drywell Unit Cooler fans 1V416A/1V416B;

c. Recirculation fan 1V418A/1V418B.

• Operation with at least one fan in each required pair provides the capability of controlling the bulk hydrogen concen_tration in primary containment without .

exceeding the flammability limit.

APPLICABILITY In MODES 1 and 2, the three Drywell Cooling fan pairs ensure the capability to prevent localized hydrogen concentrations above the flammability limit of 4.0 v/o in drywell, -assuming a worst case single active failure.

• In MODE 3, both the hydrogen production rate and the total hydrogen produced after a LOCA would be less than that calculated for the OBA LOCA. Also, because of the limited time in this MODE, the probability of an accident requiring the Drywell Cooling fans is low. Therefore, the Drywell Cooling fans are not required in M0DE3.

.. In MODES 4 and 5, the probability and consequences of a LOCA are reduced due to the pressure and temperature limitations in these MODES. Therefore,_the Drywell Cooling fans are*not required in these MODES.

SUSQUEHANNA - UNIT 1 3.6-77

Rev.4 Drywell Air Flow System B 3.6.3.2 BASES ACTIONS A.1 With one required Drywell Cooling fan in one or more pairs inoperable, the inoperable fan must be restored to OPERABLE status within 30 days. In this Condition, the remaining OPERABLE fan is adequate to perform the hydrogen mixing function. However, the overall reliability is reduced because a single failure in the OPERABLE fan could result in reduced hydrogen mixing capability. The 30 day Completion Time is based on the availability of the second fan, the low probability of the occurrence of a LOCA that would generate hydrogen in amounts capable of exceeding the flammability limit and the amount of time available after the event for operator action to prevent exceeding this limit.

B.1 and B. 2 With two.requiredDrywell Cooling fans in.one or more pairs inoperable, the ability to perform the hydrogen control function via alternate capabilities must be verified by administrative means within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The alternate hydrogen control capabilities are provided by the containment nitrogen purge system.

The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Completion Time allows a reasonable period of time to verify that

• a loss of hydrogen control function does not exist. In addition, the alternate hydrogen control system capability must be verified once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter to ensure its continued availability. Both the initial verification and all subsequent verifications may be performed as an administrative check by examining logs or other information to determine the availability of the alternate hydrogen control system. It does not mean to perform the Surveillances needed to demonstrate OPERABILITY of the alternate hydrogen control system. If the ability to perform the hydrogen control function is maintained, continued operation is permitted with two Drywell Cooling fans in one or more pairs inoperable for up to 7 days. Seven days is a reasonabl~ time to allow two Drywell Cooling fans in one or more pairs to be inoperable because the hydrogen control function is maintained and because of the low probability of the occurrence of a LOCA.that would generate hydrogen in amounts capable of exceeding the flammability limit.

If any Required Action and associated Completion Time cannot be met, the plant must be brought to a MODE in which the LCO does not apply. To achieve this status, the plant 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 />. The allowed Completion Time of 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />s:is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging plant systems .

• • SUSQUEHANNA - UNIT 1 3.6-78

Rev.4 Drywell Air Flow System B 3.6.3.2 BASES SURVEILLANCE SR 3.6.3.2.1 REQUIREMENTS Operating each required Drywell Cooling fan in low speed from the * .

control room for~ 15 minutes ensures that each subsystem is OPERABLE and that all associated controls are functioning properly.

Since required fans are operated at high speed during normal operations this SR ensures the low speed motor circuits operate. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

REFERENCES 1. FSAR 9.4.5

2. Regulatory Guide 1.7, Revision 3.

3. FSAR, Section 6.2.5.

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

SUSQUEHANNA - UNIT 1 3.6-79

Rev.4 Drywell Air Flow System 8 3.6.3.2 THIS PAGE INTENTIONALLY LEFT BLANK

• SUSQUEHANNA - UNIT 1 3.6-80