ML20204J958

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Rev 4 to Emergency Operating Procedure FR-H.1, Response to Loss of Secondary Heat Sink
ML20204J958
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 06/03/1988
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
FR-H.1, NUDOCS 8810250302
Download: ML20204J958 (19)
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Text

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g JUN O 31988 SUGER TTRE REY.155LT/DATE FR H.1 RESPONSE TO LOSS OF SECONDARY Rev. 4 HEAT SINK A.

PURPOSE

{

This procedure provides actions to respond to a loss of secondary heat sink in all steam generaton.

B.

SYMPTOMS OR ENTRY CONDITIONS This procedure is entered from:

1.

E 0, REACTOR TRIP OR S AFETY INJECHON. Step 16 when minimum AFW flow in not venfled.

2.

F 0.3. HEAT SINK Critical Safety Function Status Tree on a RED condition.

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8810250302 001007 i

ADOCKOSOOg3 PDR P

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I NDiBER TT!1E REY.15SL 11 l

F R.II.1 RESPONSE TO LOSS OF SECONDARY Rev.4 llEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD r

7 CAUTION:

o IF TOTAL FEEDWATER IS LESS THAN 320 GPAf DUE TO OPERATOR ACTION, THIS PROCEDURE SHOULD NOT BE PERFORAfED.

o IF EITHER OF THE FOLLOWING CONDITIONS EXIST RCPs SHOULD BE TRIPPED AND STEPS 10 THROUGH 15 SHOULD BE lAISIEDIATELYINITIATED FOR RCS BLEED AND FEED:

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CORE EXIT THERhtOCOUPLES ARE APPROACHING

$75

  • F ASL1 RCS PRESSURE IS APPROACHING 2350 PSIG.

QE o

WIDE RANGE LEVEL IN ALL FOUR STEAAf GENERATORS I

IS LESS THAN 21 %.

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o FEEDWATER FLOW SHOULD NOT BE ESTABl2SHED TO ANY

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FAULTED SG IF A NONFAULTED SG IS AVAllABLE.

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L ji CIIECK IF SECONDARY HEAT SINK IS REQUIRED:

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a. Check RCS pressure -
a. QQ ID E 1, l

GREATER 11{AN ANY LOSS OF REACTOR OR NONFAULTI!D SG PRESSURE SECONDARY COOLAST, Step 1.

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b. Check RCS temperature -
b. Try to place RHR system in senice GREATER T11AN %0* F IN ACCORDANCE WTI11 (277' F FOR ADVERSE NOP 2.91.

CONTALNMENT)

RHR SYS1T.M PLACING SYSTEM i IN SERVICE, w hile continuing in '.his procedure.

IE adequate core cooling established with RilR System in senice.

t IliES RETURN IQ procedure and step in etYect.

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I JUNO 3 MBS NUMBER TTILE REY ISSIJE/DATE FR.H.!

RESPONSE TO LOSS OF SECONDA*.Y Rev.4 HEAT SINK i

STEP ACT10N, EXPECTED RESPONSE RESPONSE NOT OBTAthID i

NOTE:

IF BOTH STEAM DRIVEN AUXIUARY FEEDWATER PUMPS ARE NOT t

OPERABLE, THE ELECTRIC AUXIUARY FEEDWATER PUMP CAN BE

)

ALIGNED,IN ACCORDANCE WITH NOP 2.18 3, ELECTRIC AUX /UARY

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l FEED PUMP OPERATION, TO PROVIDE AUX FEEDWATER FLOW.

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1RY TO ESTABLISH AUX FEEDWATER FLOW TO AT LEAST ONE SO:

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a. Check controf roomindications for cause of AUX feedwater failure.

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o Check DWSTlevel l

o Check AUX feedwater valve alignment I

b. Try to restore AUX feedwater flow l
c. Check total AUX feedwater flow.
c. Check the "A" turbine driven AUX GREATER THAN 320 GPM feedwater pump operating, j

11EN perform the following:

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1. Close FW MOV 160.

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2. Open FW MOV 35.

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  • E FW MOV 35 fails to open.

THEN perform the follomng:

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a. Stop "FW MOV 35.A" AFW pump, i
b. Open

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c. Restart "A" AFW pump. *2 j

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3. Check SG levels increasing, j

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E "A" AUX feedwater pump SNv s'EQIinenasing, T11EN dispatch rator to locally e

restore AUX f water flow.

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GQ IQ Step 3.

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d. RFmRN IQ procedure and j

step in etYect i

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JUN O 31983 hutBER ThU REV.155(JESAR F R.H.1 RESPONSE TO LOSS OF SECONDARY Rev 4 HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 3

STOP ALL RCPs:

a. Close all four seal water return MOVs
b. E containment pressure is peater than 5 PSIO,

.1ES perform the follwing:

1. Close CH TV 240, CH TV 241 (Seal water rerum trip valves)
2. Close CC TV 1411 (CCW rerum from RCP oil coolers) 4 CHECK AT LEAST ONE CHARGING START ONE CHARGING PUMP.

PUMP RUNNING 5

TRY TO ESTABLISH MAIN k

FEEDWATER FLOW TO AT LEAST ONE SO:

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a. Check Condensate System -
a. Try to place Condensate System l

IN SERVICE in semce, E NQIplaced in senice, TIEN QQIQ Step 9, i

b. Start a main feedwater
b. Start the other main feedwater pump and open its discharge val and open its discharge valve.

E no main feedwater available i

IlENopen a main f ter pump discharge isolation valve AND QQIQ Step 7.

l E main feedwater pump discharge l

isolation valves can SQIbe opened, 11IEN QQIQ Step 9.

c. Establish main feedwater flow:

o Open feedwater bypass AOVs to each SO l

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JUN 0 31958 butBER TTlu REY.155LTSATE F R. H.1 RESPONSE TO LOSS OF SECONDARY Rev. 4 HEAT SINK

~

STEP ACTION 4XPECTED RESPONSE RESPONSE NOT OBTAISTD l

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CHECK SG LEVELS:

a. Check wide range levels -
a. E feedwater Dow to at least one i

GREATER DIAN 63 %

SG verified, (67 % FOR ADVERSE DIEN maintain How ta restore wide CONTAINMENT) range level to greater than 63 %

(67 % for adverse containment).

I E flow M verified, IllES QQIQ Step 7.

b. RETURNIQ procedure and step in effect

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JUN 0 31938 NUMBER Tm2 REV.155l!LD ATE F R li.1 RESPONSE TO LOSS OF SECONDARY Rev,4 llEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAlhTD r

7 CAUTION!

F0ll.0 WING BLOCKING OF AUTOSfATIC St ACTUATION, ofANUAL St ACTUATION biAY BE REQUIRED IF CONDITIONS DEGRADE.

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7 TRY TO ESTABLISH FEEDWAER FLOW FROM CONDENS ATE SYSEM:

ressurize RCS to less than

a. Def5 PSIO:

18

1. Check letdown -
1. Use one PRZR PORV.

IN SERVICE E letdown b'QIin service, THEN use auxiliary spray.

QQ IQ Step 7 b.

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2. Use auxiliary spray
b. Block SI actuation using SI block switch l
c. Depressurize at least one S0 to less than 400 PSIO:

1, Dump steam to condertser at

1. Dump steam at nuximum rate matimum rate using the following:

o Atmos sheric vent valve.

l o Terry Turbine steam sup sly valves. i o Hog Jet steam supply va ves.

E steam can b'QI te dumped, DIEN QQ IQ Step 9.

d. Establish condensate flow:
d. E condensate flow b'QI established, i

1, Isolate main feedwater pump rectrtulation vahes by closing IM V 124A and FW V 124B

2. Open main feedwater pump discharge MOVs
3. Open feedline bypass AOVs to each SO q

JUN 0 31998 NUMBER TTT U REY. ISSIMUDATE F R.H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK

$17.P ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 8

CHECK SO LEVELS:

a. Check wide range levels -
a. E feedwater flow to at least one GREATER THAN 63 %

SO verified.

(67 % FOR ADVERSE THEN maintain flow to restore wide CONTAINMENT) range level to greater than 63 %

(67 % for adveru containment).

E flow MQI verified, IHEN QQIQ Step 9.

b. RETURN IQ procedure and step in effect I

9 CHECK FOR LOSS OF SECONDARY RETURNIQ STEP 1.

IEAT SINK:

I o Check core exit thermocouples j

approaching 575' F ASD RCS pressure approaching 2350 PSIO

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o Wide range levelin all four steam generatcts less than 21 %

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JUN00 IS6s NutBER EU REY. IS$1lE/DATE FR H.1 RESPONSE TO LOSS OF SECONDARY Rev. 4 HEAT SINK STEP ACTION, EXPECTED RESPONSE RESPONSE NOT OBTA!hTD l

CAUTION:

STEPS 10 THROUGH 16 MUST BE PERFORMED QUICKLY IN ORDER TO ESTABUSH RCS HEAT REMOVAL BY RCS BLEED AND FEED.

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10 ACTUATE Si BY hiANUALLY TRIPPING BOTH SI WL RELAYS:

a. Check containnwnt HCP WLs -

TR1PPED

b. Check containment isolation valves -
b. hianually close containment isolation CLOSED valves hM required to be open for (SEE OPPOSITE PAGE) recovery opentions.

11 VERIFY RCS FEED PATH:

a. Check SI valves IN PROPER
a. Align valves as necessary.

EhtERGENCY ALIGN 3 TEST (SEE OPPOSTTE PAGE)

b. Check HPSI pumps -
b. Start HPSI pumps.

AT LEAST ONE RUNNINO IE HPSI pumps can SQI be started,

'IHEN start at least one charging pump by taking the pump control l

switch to the "Tnp" then to the ' Start"

position, j
c. Establish Charging flow:
1. Check off. site power -

1, Pbc: tah LPS1 pomp contml AVAIIABLE switches in TPO.

2. Stan at least ora chargmg sump by taking the pump contro. swirh to the irip" then to the "Start"
position,
d. Fully open CH FCV 110 and CH FCV 110A 12 CHECK PORVs AVAILABl.E:

START OS' LONTAINMENT lhTRUbi~

'IR COhiPRESSOR o Check "PORY accumulatcr TO ESTAli a3H INSTRUMEST AIR pressure low" alarm -

PRESSURE.

NOT ACIUATED l

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JUN 0 31989 Su mER MM REV.15 SUES A n F R. H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 l

HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTEt "LOW PORV AIR PRESSURE" ALARM ACTUATION SHORTLY AFTER OPENING ONE PORV MAY INDICATE EXCESSIVE LEAKAGE THROUGH THAT PORV ACTUATOR. IF THIS OCCURS, IMMEDIATELY OPFN THE OTHER PORY AND THEN CLOSE THE PORY FIRST OPENED.

)

13 ESTABLISH RCS BLEED PATH:

a. Verify power to PRZR PORV
a. Restore power to block vahes.

block valves. AVAILABLE

b. Open one PRZR PORV and i

its block valve

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c. Check RCS pressure -
c. QQ IQ Step 14.

1 GREATER THAN 405 PSIO (635 PSIG FOR ADVERSE l

CONTAINMENT)

d. Stop both LPSI pumps and place control switches in TPO 14 VERIFY ADEQUATE RCS BLEED t

l PATit

a. Check PRZR PORVs -
a. Open one PORV.

AT LEAST ONE OPEN l

b. Check RCS pressure.
b. Open second PORV and block valve LESS THAN 1400 PSIO (1700 PSIO FOR ADVERSE E two PORVs and block valves CONTAINMENT)

EQIopen.

T11EN perform the following.

1. Ogn all RCS high point vents:

l o IIcad Vents l

o PRZR Vents i

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2. Depressurhe at least one intact SG l l

to atmospheric pressure using i

atmospheric vent valve.

3. Align any available low pressure water soarce to the depressurued !

SG(s).

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0 JUN 0 31988 NUMBER TT1 u REV. lSSUESATE F R. H.1 RbNF F. TO LOSS OF SECONDARY Rev.4 70' iWK t

STEP

. C '.un JPECTED RESPONSE RESPONSE NOT OBTAGED 15 MAlhTAIN RCS HEAT REMOVAL:

o 51aintain SI flow o hiaintain PRZR PORVs open as required o Start all available Control Rod Drive o Check power available, Mechanism Cooling Fans THEN reset 480 V lockout relays o 27Y 6 and 27Y 6B for bus 6 o 27Y 7 and 27Y.7B for bus 7 Close supply breakers for MCC 7 THEN stan all available CRDM fans.

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CAUTION:

IF THE RWST LEVEL DECREASES TO LESS THAN 130.000 GALLONS, THE SI SYSTEM SHOUlD BE AUGNED FOR RHR RECIRCULATION USING ES.I.3, TRANSFER TO RHR RECIRCULATION.

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NOTEt IF RCS TEMPERATURE IS REDUCED bel.DW 280

  • F AND SECONDARY HEAT SINK HAS NOT BEEN ESTABUSHED, THE RHR SYSTEM CAN BE PLACED IN SERVICE USING

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ATTACHMENT A.

h 16 COSTINUE EFFORTS TO ESTABLISH SECONDARY HEAT SINK IN AT i

LEAST ONE SO:

o AUX feedwatee flow l

o Main feedwaier flow o Condmsate flow i

o Otherlow pressure flow 17 CHECK FOR ADEQUATE I

SECONDARY HEAT SINK:

a. Wile range levelin at least one SG.

RE' TURN IQ Step 16.

OREATER' IRAN 63 %

t (67 % FOR ADVERSE COSTAINMENT)

Page 10 of 19

JUN ; 31988 butBER TME REV. lSS11DATE F R.!!.1 RESPONSE TO LOSS OF SECONDARY Rev,4 HEAT SINK STEP ACT10N/ EXPECTED RESPONSE RESPONSE NOT OBTALVED 18 CIECK RCS 111MPERA'IURES:

o Check core exit thermocouples.

RETURNIQ Step 16.

DECREASING o Chack RCS cold leg temperatures.

DECREASING r

7 CAUTION:

o if 0FF. SITE PO%'ER IS LOST AFTER 51 RESET, AIANUAL i

ACTION SfAY BE REQUIRED TO RESTART SAFEGUARDS EQUIPAfENT.

o IF C0hTROL 5%' ITCH FOR ANY SHUTDOH'N CHARGING l'

PUhfP %'AS TAKEN TO THE TRIP POSITION, THE PUSfP(S)

SIAY AUTO START %' HEN BOTH Si %'l RELAYS ARE RESET.

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19 RESET SI AND CONTAINMENT

{

ISOLA 110N:

}

a. Check containment pressure -
a. Perform the following:

LESS TRAN 5 PSIO

1. Open CKTs A13 and B13 in DC panels A and B.
2. Reset SI WL Relays.
3. IE charging pump control switch (es) are h'0Iin TT'O, T1EN restore low discharge pressure auto start for shutdown i

charging p, ump (s) by taking pu control switch (es) to the "Trip,mp ;

t position then releasing switch (es) to the "Auto" position.

4. QQIQ Step 19 c.

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b. Reset SI and containment isolation (SEE OPPOSilli PAGE) l
c. Place LPS! pumps in standby l
d. Place PRZR heater control switches in TPO l

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JUN031955

! SutBER TTT U REY. IS$tIDA11 F R.H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK STEP ACT10N/ EXPECTED RESPONSE RESPONSE NOTOBTAINID NOTE:

o AFTER STOPPING ANY St PUMP. RCS PRESSURE SHOULD BE ALLOWED TO STABluZE BEFORE STOPPING ANOTHER St PUMP.

o THE CHARGING AND HPSI PUMPS SHOULD BE STOPPED ON ALTERNATE ECCS TRAINS WHEN POSSIBLE.

20 CHECK IF ONE CHARGING PUMP SHOULD BE STOPPED:

a. Two charging pumps RUNNING
a. QQIQ Swp 21.
b. Determine required RCS subcooling from table below:

REQUIRED RCS SUBCOOLING (

  • F)

HPSI PUMP I

STA1TJS COSTAINMENT l

NORMAL ADVERSE NOSE RUNNING 50 228 OSE RUNNING 32 214 TWO RUNNING 32 213 i

c. Check RCS subcooling based on core
c. DO NOT STOP Q{ARGING PUMP. I esit thermocou pies -

QQIQ Swp 23.

GREATER 1 FAN REQUIRED l

SURCOOLING l

d. Check PRZRlew1
d. DO NOT STOP CHARGING PUM GREA1ER THAN 10 %

QQIQ Swp 23.

(24 % FOR ADVERSE COSTAINNEND

e. Stop one charging pump Page 12 of 19

JUN 0 31995 sutsta mu nEv. isst;Lt>m FR H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK STEP ACT10N4XPEC11D RESPONSE RESPONSF NOT OBTAINED 21 CHECK IF HPSI PUMP SHOULD BE STOPPED:

a. Two HPSI pumps RUNhTNG
a. GL TD Step 21 f.

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b. Determine required RCS subcooling from table below:

REQUIRED RCS SUBCO JLING (

  • F )

PRESSURIZER ONE CHAROING PUMP

' O CHARGING PUMP PRESSURE RUNNING RUNNING

( PSIO )

CONTAD. MENT COSTAINMEST NORMAL ADVERSE NOSLMAL ADVERSE 1000 to 2000 76 12?

85 139 600 to 1000 105 272 116 297 0 to 600 136 272 146 297

c. Check RCS subcooling based on core
c. DO NOT STOP HPSI PUMP.

esit thermocouples -

QQIQ Step 23.

GREATER UIAN REQUIRED i

SUBCOOLING

d. Check PRZR level.
d. DO NOT STOP HPSI PUMP.

i GREATER DIAN 10 %

QQIQ Step 23.

(24 % FOR ADVERSE 4

i CONTAINMILST)

e. Stop one HPSI pump i

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JUN 0 21955 i

butBER TTTU REY. !$$11DATE F R.H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK

('

STEP ACT10NEXPECTED RESPONSE RESPONSE NOT ORTALVED 21

f. One HPS! and one charging pump.
f. QQIQ Step 22.

RUNNING

g. Determine required RCS subcooling from table below:

REQUIRED RCS SUBCOOLING (

  • F )

PRESSURIZER PRESSURE CONTAINMEST

( PSIO )

NORMAL ADVERSE GREATTER TTRN 1400 32 32 i

1350 to 1400 105 180 l

1300 to 1350 172 312 f

1250 to 1300 206 365 1200 to 1250 244 365 1

1100 to 1200 285 365

{

LESS TRLN 1100 326 365

h. Check RCS subcooling based on cost
c. DO NOT STOP HPS! PUMP.

exit thermocouples.

QQ IQ Step 23.

GREATER TELN REQLRED SUBCOOLING

l. Check PRZR level.
d. DO NOT STOP HPSI PUMP.

GREATER THAN 15 %

QQIQ Step 23.

j (35 % FOR ADVERSE I

COSTAINMENT)

j. Stop second HPSI pump l

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JUN 0 31988 4

NUhDER ITTE REY ISSLT.7 ATE FR H.1 RESPONSE TO LOSS OF SECONDARY Rev 4 HEAT SINK l

STEP l

ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD 22 CHECK IF NORMAL CHARGING l

FLOWIS ADEQUATE:

a. Check charging pumps -

l ALL BUT ONE STOP?ED i

b. Check RCS subcooling -
b. QQIQ Step 23.

GREATER THAN 32 F

c. Check PRZR level-
c. QQIQ Step 23.

GREATER THEN 10 %

(24 % FOR ADVERSE i

CONTAINMENT) l

d. QQIQ Sep 24 l

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JUN 0 31988 NUMBER TME REV. ISS1RUDATE FR.H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK STEP ACTION /EXPEC'3D RESPONSE RESPONSE NOT OBTAINED 23 CHECK PRZR PORY STATUS:

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a. Check PRZR PORVs - ANY OPEN
a. QQIQ E 1, l

LOSS OF REACTOR OR SECONDARY COOLANT, Step 1.

b. Establish letdown
b. E containment pressure is (SEE OPPOSITE PAGE) less than 5 PSIO,

'IllEN establish alternate letdown by performing the following:

1. Reset Containment HCP WL Relays.
2. Open DH TV 1841, drain header trip valve.
3. Reset solenoid in blowdown room for drain header trip valve, DH TV 1847,
4. Line up drain header to VCT:

a.

Cose DH V 408, drain header to PDT.

b.

Open CH V 383, drain header to VCT.

5. Cose breaker for DH MOV 310.
6. Open one loop drain MOV, t
7. Ynmttle DH MOV 310 to maintain PR2R level.
8. Cose CH MOV 292B and i

CH MOV 292C.

2

c. Align charging pump suction to VCT:

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1. Open CH MOV 257
2. Cose BA MOV 373
3. Check BA MOV 32 - CLOSED
3. Cose BA MOV 32.
d. Contml charging flow to stabilize RCS pressure
e. Cose one open PRZR PORY and its
c. E PORV and block valve can block valve FQI be closed.

TliEN QQIQ E 1, LOSS OF REACTOR OR SECONDARY COOLANT, Step 1.

f. RETURNIQ Step 19 I

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JUN 0 3198F NUMBER IIi LE REV. ISSUcJ ATE FR H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 24 CHECK ALL PRZR PORVs AND CLOSE PRZR PORVs AhD BLOCK BLOCK VALVES CLOSED VALVES.

I 25 CONTROL CHARGING AND LETDOWN FLOW TO MAINTAIN RCS PRESSURE NOTE:

PLANT STAFF SHOULD DETERMINE BEST MEANS OF PRESSURE CONTROL, EITHER BUBBLE IN PRZR OR SOUD PLANT CONTROL.

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26 GQ IQ ES 1.1, Si TERMINATION, STEP 8 l

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JUN 0 31988 EfBER Tm.E REV. ISSUE /DATE F R.H.1 RESPONSE TO LOSS OF SECONDARY Rev 4 HEAT SINK t

ATTACHMENT A Procedure to be followed in the event thu plant staff decides to place RHR system in sersice if secondary heat sink cannot be established and RCS temperature is less than 280' F.

Initial Conditions:

1.

PRZR level 100 %.

2.

HPSI and/or charging pumps operating.

3.

One or both PRZR PORVs oper:.

4.

RCS temperature less than 280* F.

Procedure:

1.

Check RCS subcooling greater than 32' F.

t 2.

Stop one HPSI pump.

f 3.

Allow RCS pressun to stabilize.

4.

Stop second HPSI pump.

5.

Control charging flow to maintain RCS pressure.

l 6.

Reduce RCS pressurt to 300 PSIG (uulize Heise gauge to verify RCS pressure).

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7.

Reset SI.

a.

Open ekts.13A and 13B in DC panels A and B.

i b.

Reset SI WL relays.

8.

P'

, letdown system in service to control RCS pressure, i

To open HCP operated letdown isolation valves perform the following-Place HCP OVERRIDE switch for LD TV 230 in the OVERRIDE position.

a.

b.

Place the letdown isolation valve control switces in the OPEN posinon.

l 9.

Cycle CH MOV 257 to control VCTlevel.

l 10.

Place RHR system in service IN ACCORDANCE WITH NOP 2.91. RHR SYSTEM PLACINO SYS'EM IN SERVICE.

11.

Shut PRZR PORVs and block valves. Shift charging pump suction to VCT.

l 12.

Maintain RCS pressure less than 300 PSIO.

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Continue plant cooldown IN ACCORDANCE WITH NOP 2.3 4, HOT l

STANDBY MODE 3 TO COLD SHUTDOWN MODE 5.

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JUNO 3 G88 NUMBER TTTLE REV. ISSUE /DATE F R.H.1 RESPONSE TO LOSS OF SECONDARY Rev.4 HEAT SINK

(

3 L

e soo l

2SL \\

FLOW RAE

( GPM )

\\

200

\\\\

150 l

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100

% \\

50 I

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to too 1000 10,000 l

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( MINUTES )

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FIGURE FRH11 MINIMUM CORE COOLING FLOW RAW VERSES TIhE AFTER REACTOR TRIP j

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