ML20078N401

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Proposed Tech Specs 3.9.8.1,3.9.8.2 & Bases Re Shutdown Cooling & Coolant Circulation
ML20078N401
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 02/13/1995
From:
SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20078N396 List:
References
NUDOCS 9502150305
Download: ML20078N401 (14)
v • d • e


Text

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REFUELING OPERATIONS 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

HIGH WATER LEVF-LIMITING CONDITION FOR OPERATION 3.9.8.1 At least one shutdown cooling train shall be OPERABLE and in operation.#*

APPLICABILITY: Mode 6 when the water level above the top of the reactor pressure vessel flange is greater than or equal to 23 feet.

ACTION:

With no shutdown cooling train OPERABLE and in operation, suspend all operations involving an increase in the reactor decay heat load or a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to OPERABLE and operating status as soon as possible. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE RE0VIREMENTS 4.9.8.1 a. At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

  1. The shutdown cooling train may be removed from operation for up to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period during the performance of CORE ALTERATIONS in the vicinity of the reactor pressure vessel hot legs.
    • This Technical Specification is not effective during the Unit 2 Cycle 8 refueling outage.

SAN ON0FRE-UNIT 2 3/4 9-8 AMENDMENT No.

9502150305 950213 PDR ADOCK 05000361 P PDR

_. - . - - - . . . . . - - - . .~ ._.- - -

1 fiEFUELING OPERATIONS 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

HIGH WATER LEVEL LIMITING CONDITION FOR OPERATION 3.9.8.1 At least one shutdown cooling train shall be OPERABLE and in operation.#*

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vessel flange is greater than or equal to 2-3 20 feet.

ACTION:

With no shutdown cooling train OPERABLE and in operation, suspend all operations involving an increase in the reactor decay heat load or a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to OPERABLE and operating  ;

status as soon as possible. Close all containment penetrations providing direct ,

access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.9.8.1 a. At least one shutdown cooling train shall be verified to be in ,

operation and circulating reactor coolant at a flow rate of greater than or equal to 220] gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

'With the' upper guide structure removed from. the reactor pressure vessel,Tthe shutdown cooling train may be ~ removed' from operation for~ ~up to F 2E hours per 8-hour period during the performance of 1) CORE ALTERATIONS in the vicinity of the reactor pressure vessel hot legs or 2) testing'of LPSI(system components required by.theiinservice inspection program.provided:

a. The maximum RCS. temperature'is' maintained X 140*F;
b. No operations 1are permitted that 'would cause a reduction of{the RCS

' boron concentration.

c.DlThe capability :to close? the containment- penetrations with' direct i access to the outside atmosphere within the ' calculated time.to boil  ;

is maintained.

~ d. The reactor cavity water level is maintained K20'~ feet:above'the top 1 of thezreactor)cessure:vesself flange,;or,' for Core Alterations,  ;

  • A containment spray pump may be used in place of a low pressure safety I injectionflow.

cooling pump (in either or both shutdown cooling Subsequent--to-implementat4cn of DCP 2trains 5853}to provide shutdown

    • This Technical Specification is effective only for the Unit 2 Cycle 8 )

refueling outage.

4 SAN ON0FRE-UNIT 2 3/4 9-8a AMENti1ENT No.

l

REFUELING OPERATIONS LOW WATER LEVEL **

LIMITING CONDITION FOR OPERATION 3.9.8.2 Two independent shutdown cooling trains shall be OPERABLE and at least one shutdown cooling train shall be in operation.*

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vessel flange is less than 23 feet.

ACTION:

a. With less than the required shutdown cooling trains OPERABLE, immediately initiate corrective action to return the required shut-down cooling trains to OPERABLE status, or to establish greater than or equal to 23 feet of water above the reactor pressure vessel flange as soon as possible.
b. With no shutdown cooling train in operation, suspend all operations involving a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to operation. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.9.8.2 At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

(Subsequent to-implementation of DCP 2 5853)

    • This Technical Specification is not effective during the Unit 2 Cycla 8 refueling outage.

1 SAN ON0FRE-UNIT 2 3/4 9-9 AK: .. .<ENT NO.

l I

REFUELING OPERATIONS LOW WATER LEVEL **

LIMITING CONDITION FOR OPERATION .

3.9.8.2 Two independent shutdown cooling trains shall be OPERABLE and at least ene. shutdown cooling train shall be in operation.*

or One' train?offshutdowncoolingTshalls:be? OPERABLE:and!operatingiunderythd ~'

  • followingl conditions:

1)[ jThelreactorlhas;belenjshutdownifor?atyleasti:6) days; 2)1- ~ Therwater71evel?

-- abo _i/etthe re. 'ac.t.or,Tesse1. 0f1a_n.ge"is,?g.reat_erith_an 3)T 70ne7?trathEbfMSalt7fWater7Cobli_nigl

" " " ~ ~ " " "7(SWC)"n ^isF0PERABLEf46d

~ " '"~~""

"~"opeytjng["~

4)T 10nehtrainiof" Component? Cooling?Waterl(CCW) sand}theTCCWisW1ng

~

~^ pump areiOPERABLE;l:and:cthejCCWitrain"is/op~erating~swithieither

' ~" ~ ~ ^~~^ ""

of Jtyp0PERABLE CCW pumps; ' ~ ^

5)!' 10neltrain~ oftShutdowni Cool..i' 'ng fis':0PERABLE7with Ta7 containment

~~sprayapumpf operatingion Eshutdownicoolingy thelhigh5 pressbre safetyiinjection ! pump} and i the 316@ pressureg safetyyinjecti6tj pumploflthef same train'are OPERABLE 7andLavailable"forbinjection

" ~

"~ ~ ~ ' ' ~ ~ '

from!the*RWSTu ~ ~

?The ? RWST containsithe ivolume~of::: watert requi red itot raise 7 the 6)' ' level lto 20 ' feet above the reactor vessel flange. ~ ' ~ ~ ~

7)1 LTheiassociated: Emergency;Diese1[ Generator..lis10PERABLE; 8)c ?TheLwater temperature of thelS_0C^ system (isimaintained?.1'ess'thad

~ ' "120* F.

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vesselflangeislessthan23g0[ feet.

ACTION:

a. With less than the required shutdown cooling trains OPERABLE, immediately initiate corrective action to return the required shut-down cooling trains to OPERABLE status, or to establish greater than or equal to 24 20 feet of water above the reactor pressure vessel flange as soon as~possible.

belffoperatingLone~ trainTof;th' 'shbtdown?

e cooling' system 41thllesCthan "20ifeetfof water:~above the reactor pressure'vesselkflangeian~dfanyhof the f reqst reCconditions1(lithro6gh(8)iare' noti met, immediately?take action.to establish greater:than or equal:to 20ifeet:of waterrabove .

the reactor pressure; vessel flange.

    • This Technical Specification is effective only for the Unit 2 Cycle 8 refueling outage.

SAN ONOFRE-UNIT 2 3/4 9-9a AMENDMENT N0.

l l

- b c. dith no shutdorn cooling train in operation, suspend all operations involving a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to operation. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.9.8.2 At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

    • This Technical Specification is effective only for the Unit 2 Cycle 8 refueling outage l

SAN ON0FRE-UNIT 2 3/4 9-9b AMENDMENT NO. l l

1

l

. REFUELING OPERATIONS BASES 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

The requirement that at least one shutdown cooling train be in operation ensures >

that (1) sufficient cooling capacity is available to remove decay heat and maintain the water in the reactor pressure vessel below 140 F as required during the REFUELING MODE, and (2) sufficient coolant circulation is maintained through the reactor core to minimize the effects of a boron dilution incident and prevent boron stratification.

In MODE 6 a containment spray (CS) pump may be used in place of the low pressure safety injection (LPSI) pump in either or both shutdown cooling trains to provide ,

shutdown cooling (SDC) flow.

The requirement to have two shutdown cooling trains OPERABLE when there is less than 23 feet of water above the reactor pressure vessel flange, ensures that a single failure of the operating shutdown cooling loop will not result in a com-plete loss of decay heat removal capacity. With the reactor vessel head removed and 23 feet of water above the reactor pressure vessel flange, a large heat sink is available for core cooling, thus in the event of a failure of the operating shutdown cooling train, adequate time is provided to initiate emergency procedures to cool the core.

i i

F

    • This Technical Specification Basis is not effective during the Unit 2 Cycle 8  !

refueling outage. .

SAN ON0FRE - UNIT 2 B 3/4 9-2a AMENDMENT NO.

I

. REFUELING OPERATIONS BASFS 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

The requirement that at least one shutdown cooling train be in operation ensures 7 that (1) sufficient cooling capacity is available to remove decay heat and  ;

maintain the water in the reactor pressure vessel below 140*F as required during the REFUftlNG MODE, and (2) sufficient coolant circulation is maintained through the reactor core to minimize the effects of a boron dilution incident and prevent boron stratification.

In MODE 6 a containment spray (CS) pump may be used in place, of the low pressure safety injection (LPSI) pump in either or both shutdown cooling trains to provide shutdown cooling (SDC) flow.

The requirement to have two shutdown cooling trains OPERABLE when there is less than 23 20 feet of water above the reactor pressure vessel flange, ensures that a single failure of the operating shutdown cooling loop will not result in a i complete loss of decay heat removal capacity. With the reactor vessel head r removed and 33 20 feet of water above the reactor pressure vessel flange, a large heat sink is available for core cooling, thus in the event of a failure of the operating shutdown cooling train, adequate time is provided to initiate emergency  ;

procedures to cool the core. i i

With - the ~ reactor' vessel- head ' removed "and :129 feet: ofl water? above i.the " reactor i pressure' vessel 1 flange?and allithe:specifiedLrequirements mete a heat sink?is i available ' for core; cooling and a' method?is1availablento restore;the' reactor cavity .levelito 20 feet above the reactor vessel flange. Therefore. in the event- t of a failureLof the operating:shutdownfcooling . train,' adequate time is provided to initiate emergency procedures:to' cool the coree'

~

f I

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    • This Technical specification Basis is effective only for the Unit 2 Cycle 8 refueling outage.

SAN-0NOFRE-UNIT 2 B 3/4 9-2b AMENDMENT No.

o un REFUELING OPERATIONS 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

HIGH WATER LEVEL LIMITING CONDITION FOR OPERATION 3.9.8.1 At least one shutdown cooling train shall be OPERABLE and in operation.#*

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vessel flange is greater than or equal to 23 feet.

ACTION:

With no shutdown cooling train OPERABLE and in operation, suspend all operations involving an increase in the reactor decay heat load or a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to OPERABLE and operating status as soon as possible. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.9.8.1 a. At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

  1. The shutdown cooling train may be removed from operation for up to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period during the performance of CORE ALTERATIONS in the vicinity of '

the reactor pressure vessel hot legs.

injection pump in either or both shutdown cooling trains to provide shutdown cooling flow. (Subsequent t0 implementation of """ 3 5853}

    • This Technical Specification is not effective during the Unit 3 Cycle 8 refueling outage.

SAN ON0FRE - UNIT 3 3/4 9-8 AMENDMENT NO

REFUELING OPERATIONS 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

IflGH WATER LEVEL LIMITING CONDITION FOR OPERATION _

3.9.8.1 At least one shutdown cooling train shall be OPERABLE and in operation.#*

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vessel flange is greater than or equal to 23 20 feet.

ACTION:

With no shutdown cooling train OPERABLE and in operation, suspend all operations involving an incrsase in the reactor decay heat load or a reduction in boron concentration of tha Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to OPERABLE and operating status as soon as possible. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.9.8.1 a. At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

'With;thef upper guide structure . removed from the reactor: pressure vessel,ithe shutdown' cooling train ~may be remove'd from operation'for up to P 2 (hoars'per 8-hour period during the performance of 1) CORE ALTERATIONS in the~ vicinity of the reactor pressure vessel hot legs or)2)Ltestingiof LPSI sys' tem comgionents T i

required byLtheLinservice inspection program provided:

~

)

a.J The maximum RCS: temperature is; maintained 1140*F. .
b. LNo
operations are permitted that would!cause-'a~reddction'ofithe i RCS boron concentration.

~

I ci Theicapab_ilityLto;close theLeontain' ment"penetrati'ons withidirect I access tofthe outside' atmosphere withinLthe calculated timesto boil is. maintained.

'd. The reactor cavity 1 water lesellis"mai'ntained Y20 'feetiabose cthe

^ top; of> the reactor pressureLvessel. f1ange,;or,' for C6re Alterations, r 23'. feet above Lthe . top' of the reactorj pressure vessel- flange.

    • This Technical Specification is effective only for the Unit 3 Cycle 8 l refueling outage. I SAN ON0FRE - UNIT 3 3/4 9-8a AMENDMENT NO.

_ . --. = _ ~ . _ __ . - , _- -

t REFUELING OPERATIONS ,

LOW WATER LEVEL **

LIMITING CONDITION FOR OPERATION 3.9.8.2 Two independent shutdown cooling trains shall be OPERABLE and at least one shutdown cooling train shall be in operation.#*

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vessel flange is less than 23 feet.

ACTION:

a. With less than the required shutdown cooling trains OPERABLE, immediately initiate corrective action to return the required  ;

shutdown cooling trains to OPERABLE status, or to establish greater than or equal to 23 feet of water above the reactor pressure vessel flange as soon as possible.

b. With no shutdown cooling train in operation, suspend all operations involving a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required shutdown cooling train to operation. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

i SURVEILLANCE REQUIREMENTS 1

4.9.8.2 At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

(4eth-shut 4ewn-soeMng train; may be re=cved from operation for up tc 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />

-per-e-hour peried during the per-fer= nce of CORE ^.LTERATIONS in the .icinity of-the reac-ter-pressure vessel het leg provided all Operation; involving a reducticn in bcron concent+at4en-ef-the RCS are suspended. 3

    • This Technical Specification is not effective during the Unit 3 Cycle 8 refueling outage.

SAN ONOFRE - UNIT 3 3/4 9-9 AMENDMENT NO.

l I

-.. - .=- - -

REFUELING OPERATIONS l

. LOW WATER LEVEL" LIMITING CONDITION FOR OPERATION 3.9.8.2 Two Independent shutdown cooling trains shall be OPERABLE and at i least one shutdown cooling train shall be in operation.#*

pr Onel trai nioff shutdownTcool i ng} hall L beTOPERABLE7and 7 opyra{i.d[UndeE th6 following; conditions:

1); (TheireactoQasJbesnTshutdownffogatT1leastf61daisz .

1 2)L lTheTwatergevel[aboveltheTreactorpessel(flang'e ds[grea.ter thani:12jfeet3 3)' ,

10ne ? trai n ~of1 Sal t?Wate ri C60l i ng~ T(SWC)1i

-. ~

SCOPE.RABLET and l

4)L' 3 0nestrain~-of Compo' ent~-

n Cooling'Waterf-(CCW):pand?the7CCWiswi_.n~g ~

~~pumplare;0PERABLE,Jand~the:CCW?trainlisLoperating;with '~~ ' ~ . ~

either ofLthe;;0PERABLELCCW; pumps.

5)L One trainjof Shutdown Cooling is OPERABLE with:'a' containment spraygpump; operating on: shutdown'.'cooli safetylinjectionipump: and the low pres.ng,;theThigb(pressufi' sure : safety;;; injection" l pump of. theisameltrain:are' OPERABLEfand availableifor~ ~ l injection'fromthe?RWST,  !

1 6)J

~'

lThelRWST containsithel:volbmelf;waterJrequiredEto#aisefthe. '

"l evel ? to1201. feet 1 abo, vel the ireactord vesse1L fl ange !

7)l Th6Thssociat6d. EmeFgericij Di eshl:];GeneratorfiM0PERABLE?

8)1 EThe" wate r ! temp e ra ture of: thel SDCf system ?.i s ima i ntai ned ;16ss

'than(120*F.

APPLICABILITY: MODE 6 when the water level above the top of the reactor pressure vessel flange is less than a 20:.; feet.

ACTION:

a. With less than the required shutdown cooling trains OPERABLE, immediately initiate corrective action to return the required shut-down cooling trains to OPERABLE status, or to establish greater than or equal to N 20 feet of water above the reactor pressure vessel flange as soon as possible.

'bE If: operating one'trainfof:the shutdown ocooling system.with?less

'than 20.: feet; of/ water:above theireactor: pressure vessels flange'and any of the: required conditions'(ILthroug n8) are not met, immediately0takef action to;. establish greater: than~ or equal [ tof20 feet 'of twater above'the reactor pressure: vessel flange.

    • This Technical Specification is effective only for the Unit 3 Cycle 8 refueling outage.

SAN ON0FRE - UNIT 3 3/4 9-9a AMENDMENT NO.

b b. With no shutdoen cooling train in operation, suspend all operations involving a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required sh: tdown cooling train to operation. Close all containment penetrations providing direct access from the containment atmosphere to the outside atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.9.8.2 At least one shutdown cooling train shall be verified to be in operation and circulating reactor coolant at a flow rate of greater than or equal to 2200 gpm at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

  1. Beth-shut 4er., cooling train; =cy be-removed frc= cperat-icn for u: te I hour per S hour-per4ed-4ur4ag-the-per4.. ...... I CORE ,%TERATMMS i n t ic . icini ty of-thmst+r--pressure ve;;cl het leg; pravided al' operations involving a redestien in boren aneentrat4cn of the RQ-are-suspende4r

injection pump in either or both shutdown cooling trains to provide shutdown '

cooling flow. (Sub;cquent to imple:centatien of MMP 3 5853)

    • This Technical Specification is effective only for the Unit 3 Cycle 8 refueling outage SAN ONOFRE - UNIT 3 3/4 9-9b AMENDMENT N0.

REFU'ELING OPERATIONS BASES 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **  !

The requirement that at least one shutdown cooling train be in operation ensures I that (1) sufficient cooling capacity is available to remove decay heat and main-  !

tain the water in the reactor pressure vessel below 140*F as required during the REFUELING MODE, and (2) sufficient coolant circulation is maintained through the reactor core to minimize the effects of a boron dilution incident and prevent i boron stratification. t In MODE 6 a containment spray (CS) pump may be used in place of the low pressure safety injection (LPSI) pump in either or both shutdown cooling trains to provide shutdown cooling (SDC) flow.

The requirement to have two shutdown cooling trains OPERABLE when there is less than 23 feet of water above the reactor pressure vessel flange ensures, that a single failure of the operating shutdown cooling loop will not result in a com-plete loss of decay heat removal capability. With the reactor vessel head re-  :

moved and 23 feet of water above the reactor pressure vessel flange, a large heat sink is available for core cooling, thus in the event of a failure of the operating shutdown cooling train, adequate time is provided to initiate emer-gency procedures to cool the core.

    • This Technical Specification Basis not effective during the Unit 3 Cycle 8 refueling outage.

SAN ON0FRE - UNIT 3 8 3/4 9-2a AMENDMENT N0.

. REFUELING OPERATIONS

' BASES 3/4.9.8 SHUTDOWN COOLING AND COOLANT CIRCULATION **

The requirement that at least one shutdown cooling train be in operation ensures that (1) sufficient cooling capacity is available to remove decay heat and maintain the water in the reactor pressure vessel below 140*F as required during the REFUELING MODE, and (2) sufficient coolant circulation is maintained through the reactor core to minimize the effects of a boron dilution incident and prevent boron stratification.

In MODE 6 a containment spray (CS) pump may be used in place of the low pressure safety injection (LPSI) pump in either or both shutdown cooling trains to provide shutdown cooling (SDC) flow.

The requirement to have two shutdown cooling trains OPERABLE when there is less '

than 2-3 20 feet of water above the reactor pressure vessel flange, ensures that a single failure of the operating shutdown cooling loop will not result in a complete loss of decay heat removal capacity. With the reactor vessel head removed and M 20 feet of water above the reactor pressure vessel flange, a large heat sink ~is available for core cooling, thus in the event of a failure of the operating shutdown cooling train, adequate time is provided to initiate emergency procedures to cool the core.

With thei reactor? vessel; head Lremoved :-and 12 L feetJof; water; above - thelreactor pressurefvesseliflangelandTall the specifiedLrequirements4 met,la!heatTs.inkiis availableifor.. core: cooling;; and{ a; method:is available: to;l restorel th~ei reactor .

cavityllevel to:20ifeettaboveithe(reactorfvessel:f1ange;J:lThereforekiint.the i .

provided tosinitiateiemergency;proce{duresf tofcool)the c core; event'ofJa'. failure! of:L

~ ~~'

F

    • This Technical Specification Basis is effective only for the Unit 3 Cycle 8 l refueling outage. l SAN ON0FRE-UNIT 3 B 3/4 9-2b AMENDMENT No.

..

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