ML20204J659

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Rev 3 to Emergency Operating Procedure ES-1.2, Post-LOCA Cooldown & Depressurization
ML20204J659
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
ES-1.2, NUDOCS 8810250208
Download: ML20204J659 (17)
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Text

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JUN 0 31988 NUMBER Tm2 REY. ISSUE /DATE i

ES.I.2 POST LOCA COOLDOWN AND Rev. 3 DEPRESSURIZATION 1

A.

PURPOSE This procedure provides actions to cooldown and depressurize the RCS to cold shutdown conditions following a loss of reactor coolant inventory, t

B.

SYMPTOMS OR ENTERY CONDITIONS This procedure is entered from:

1.

E 1, LOSS OF REACTOR OR SECONDARY COOLANT, Step 13, when RCS pressure is greater than the shutoff head of the LPSI pumps.

2.

E3 1.1, SI TERMINATION, Step 5, w hen PRZR level cannot be maintained using normal charging.

3.

ES 1.1, Si TERhuNATION, Step 6, when RCS pressure in greater than the shutoff head of the HPSI pumps, i

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Page 1 of 17 00

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JUN 0 31988 NUMBER I TTn2 REV. ISSLT. SATE ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION I

STEP l ACTION /EXPEC 1ED RESPONSE RESFONSE NOT OBTANED 7

r 7

l CAUTION:

o IF OFF SITE POWER IS LOST AFTER RESETTING Si, AfANUAL I

ACTION AfAY BE REQUIRED TO RESTART SAFEGUARDS EQUIPEAfENT.

I o

IF RWST LEVEL DECREASES TO LESS THAN 130,000 Gall.ONS, THE SI SYSTEhi SHOULD BE ALIGNED FOR RHR RECIRCULATION USING ES 1.3, TRANSFER TO RHR l

RECIRCULATION i

o IF CONTROL SWITCH FOR ANY SHUTDOWN CHARGING PUAfP WAS TAKEN TO THE TRIP POSITION, THE PUSfP(S) l hfAY AUTO START WHEN BOTH Si WL RELAYS ARE RESET.

L J

0 NOTEt FOLDOUTPAGE SHOULD BE OPEN 1

I 1

RESET SI AND CONTAINMEST ISOLATION:

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

LESS THAN 5 PSIG

1. Open CKTs A13 and B13 in DC panels A and B.
2. Reset SI WL Relays, j
3. IE charging pump control i

switch (es) are SQIin TPO, i

THEN restore low discharge l

pressure auto start for shutdown charging pump (s) by taking pump j control switch (es) to the ' Trip" i

posidon ther, releasing switch (es) to !

the "Auto" position, t

4. QQ IQ Step 2.

l I

b. Reset Si and containment isolation

{

(SEE OPPOSITE PAGE) 2 CHECK CONTAINMENT START ONE CONTAINMENT INSTRUMENT AIR PRESSURE INTRUMENT AIR COMPRESSOR GREATER 111AN 118 PSIG TO ESTABLISH INSTRUMENT AIR l

PRESSURE.

Page 2 of 17

JUN 0 31988 NUMBER mu REV. ISSUE /DATE ES I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZAT, ION l

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

3 VERIFY ALL AC BUSES ENERGIZED TRY TO RESTORE OFF-SITE POWER BY OFF SITE POWER TO AC BUSES.

(SEE OPPOSITE PAGE)

IE OFF SITE POWER CAN b'QI BE I

RESTORED, I

THEN LOAD THE FOLLOWINO t

EQUIPMENT ON AC EMERGENCY BUSES:

1. MCC 5.

i

2. Control air compressors.
3. Semi vital 120 volt buses.
4. Closed cooling system pumps.

i

5. Battery charger l A.
6. One component cooling water pump.
7. One semce watt.r pump for each diesel.
8. IE service wateris used for RHR HX, THEN use two service water pumps.
9. Stan CARFANs as required to limit containment pressure and temperature.

r 7

i CAUTIONt RCS PRESSURE SHOULD BE Sf0NITORED IF RCS PRESSURE DECREASES TO LESS THAN 405 PSlu (635 PSIG FOR ADVERSE CONTAINbfENT) THE LPSI PUh!PS AfUST BE MANUALLY REST.'RTED TO SUPPLY WATER TO THE RCS.

L J

t 4

CHECK IF LPSi PUMPS l

SHOULD BE STOPi'ED:

j

a. Check RCS pn:ssure, a QQIQ Step 5.

o GREATER THAN 105 PSIG (635 PSIO FOR ADVERSU CONTAINMENT) i o STABLE QR INCREASING

b. Stop LPS! pumps and place in standby Page 3 of 17

JUN 0 31988 NUMBER TIT 1.E REY. ISSUE /DATE ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

r 7

CAUTIONt Af0NITOR DWST LEVEL. START AfAKEUP TO DWST BEFORE LEVEL DECREASES TO 54,000 GALLONS.

l L

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CHECK lhTACT SG LEVELS-

a. Check wide range levels -
a. Maintain total AUX feedwater flow l

GREATER THAN 63 %

greater than 320 GPM until wide j

(67 % FOR ADVERSE range levelin at least one SG is CONTAINMENT) greater than 63 %

(67 % for adverse containment),

b. Control AUX feedwater flow to
b. IE any So wide range level continues maintain wide range levels to increase in an uncontrolled manner, between 63 % and 69 %

111EN O_QIQ E 3, (67 % and 69 % for adverse STEAM GENERATOR TUBE contamment)

RUPTURE, Step 1.

7 r

CAUTION:

SHUTDOWN AfARGIN SHOULD BE Af0NITORED DURING RCS COOLDOWN.

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f i

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INfTIATE RCS COOLDOWN TO COLD SHUlDOWN:

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a. Maintain cooldown rate in RCS cold legs -

l LESS THAN 100* F / HR

b. Dump steam to condenser from intxt
b. IE condenser NQI available, i

SG(s) using steam dump valves THEN dum a steam using one QR more of the following from intact SG(s):

{

a. Atmospheric vent valve, i
b. Terry Turbine steam supply valves. l
c. Hog Jet steam supply valves.

l l

c. Use RHR system ifin service i

1 l

l Page 4 of 17

JUN 0 31988 NUMBER 7TTU REY. lSSUE/DATE E S.1.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION

\\

STEP ACTION /EXPECED RESPONSE RESPONSE NOT OBTAINED 7

CHECK RCS SUBCOOLING BASED QQIQ STEP 19 ON CORE EXIT THERMOCOUPLES GREATER DIAN 32' F i

(SEE OPPOSITE PAGE I

FOR ADVERSE CONTAINMEN~)

l I

8 CHECK IF St IS IN SERVICE:

QQIQ STEP 14 o Check HPSI pumps ANY RUNNING 9

PLACE ALL PRZR HEATER CONTROL SWITCHES IN TPO r

7 CAUTION:

VOIDING MAY OCCUR IN THE RCS DURlNG RCS DEPRESSURIZATION. THIS WILL RESULTIN A RAPIDLY INCREASING PRZR LEVEL.

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10 DEPRESSURIZE RCS TO REFILL PRZR:

I

a. Use normal PR2R spray
a. Use one PRZR PORV.

IE no PORV available, I

THEN use auxiliary spray.

i

b. Check PRZR level-
b. Continue with Step 11.

i GREATER DIAN 15 %

WHEN PRZR levelis (35 % FOR ADVERSE gn: ster than 15 %

CONTAINMENT)

(35 % for adverse containment) j THEN do Step 10 c.

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c. Stop RCS depressurization l

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JUN 0 31988 WMBER TTT U REY. ISSUE /DATE

+

ES 1.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7

r CAUTION:

IF RCP SEAL COOUNG FLOW HAD PREVIOUSLY BEEN LOST, THE AFFECTED RCP(s) SHOULD NOT BE STARTED PRIOR TO AN ENGINEERING STATUS EVALUATION.

1 L

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NOTE:

RCPs SHOULD BE RUN IN ORDER OF PRIORITY TO PROVIDE NORMAL PRZR SPR.W.

I r

11 CHECK IF ANY RCP SHOULD BE STARTED:

a. Check allRCPs STOPPED
a. Sto, all but # 3 RCP QR # 4 RCP, IlliS QQIQ Step 12.
b. Check RCS subcooling based on
b. QQ IQ Step 19.

core exit thermocouples -

(

OREATER DIAN 32' F l

(SEE OPPOSmi PAGE i

FOR ADVERSE CONTAINMENT)

c. Check PRZR level-
c. RETURN IQ Step 1J.

GREATER UfAN 15 %

(35 % FOR ADVERSE CONTAINMENT)

d. Try to start an RCP:
1. Place a jumper across designated l

terminals on # 2 horizontal terminal board in upper RCP breaker cabinet:

1 i

RCP Terminal #

Wire #

l 1

8 to 9 Pl71P2 to Pl71P4 1

2 8 to 9 Pl72P2 to Pl72P4 3

8 to 9 Pl73P2 to Pl73P4 l

4 8 to 9 Pl74P2 to Pl74P4

2. Start oi! lift pump
3. Inture seal water and com unent cooling water supplied to ACP i
4. Insure lower bearing temperature i< less than 170' F
5. Check RCS pressure j

greater than 300 PSIG Page 6 of 17

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JUN O 31988 I

NUMBER TTT11 REV. !SSUE/DATE ES 1.2 POST LOCA COOLDOWN AND Rev.3 i

DEPRESSURIZATION i

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

i i

l 11 7.

Check open CH TV 240,

7. Oxn CH TV 240, CH TV 241 and CH TV 241 and CH TV 334 C i TV 334.

l (nal water tetum trip valves) 8.

Check oxn CC TV 1411

8. Open CC TV 1411 j

(RCP oi. cooler CCW return trip valve) ib. s *n"n?dTCT"" "

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)

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Page 7 of 17

JUN 0 31588 NUMBER TTTLE REV. ISSUE /DATE i

ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION l

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

f NOTE:

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

j o

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

I t

l 12 CIIECK IF ONE CHARGING PUhtP SllOULD BE STOPPED:

a. Two charging pumps RUNNING
a. QQIQ Step 13.

j

b. Determine required RCS subcooling from table below:

REQUIRED RCS SUBCOOLING (

  • F )

HPSI PUhtP STATUS CONTAINhtEhT NORMAL ADVERSE I

J NONE RUNNING 50 228 i

ONE I

RUNNING 32 214

{

f TWO RUNNING 32 213 l

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c. Check RCS subcooling based on core
c. DO NOT STOP CHARGING PUhtP.

exit thermocouples -

QQIQ Step 19.

GREATER DIAN REQUIRED SUBCOOLING

d. Check PRZR level-
d. DO NOT STOP CHARGING PUh1P.

GREADIR '111AN 15 %

RETURN IQ Step 10.

(35 % FOR ADVERSE CONTAINMENT)

e. Stop one charging pump and place l

control switch in TPO d

Page 8 of 17

JUN 0 31988 NUMBER TTTLE REY. ISSUE /DATE ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION i

STT.P ACTION / EXPECTED RESPON$E RESPONSE NOT OBTAINED 13 CHECK IF HPSI PUMP SHOULD BE STOPPED:

a. Two HPS! pumps - RUNNING
a. Cd2IQ Step 13 f.

{

b. Determine required RCS subcooling l

from table below:

REQUIRED RCS SUBCOOLING (' F )

PRESSURIZER ONE CHARGING PUMP NO CHARGING PUhtP PRESSURE RUNNING RUNNING i

( PSIG )

COSTAINMENT CONTAINMENT I

NORMAL ADVERSE NORMAL ADVERSE 1000 to 2000 76 127 85 139 600 to 1000 105 272 116 297 0 to 600 136 272 146 297 t

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

i exit thermocouples -

CtQ IQ Step 19, GREATER THAN REQUIRED SUBCOOLING l

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

GREATER THAN IS %

RETURNIQ Step 10.

f (35 % FOR ADVERSE CONTAINMENT) l l

e. Stop one HPSI pump i

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JUN 0 31985 NUMBER TH REY. ISSUE /DATE j

ES 1.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION r

t STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

i 13

f. One HPSI and one charging pump -
f. QQ IQ Step 14.

l RUNNING

g. Determine required RCS subcoeling from table below:

{

REQUIRED RCS SUBCOOLING (3 F)

PRESSURIZER i

PRESSURE COSTAINMENT j

( PSIG )

NORMAL ADVERSE i

I i

GREATER ' IRAN l

1400 32 32 l

1350 to 1400 105 180 l

1300 to 1350 172 312 j

1250 to 1300 206 365 t

1200 to 1250 244 365 l

1100 to 1200 285 365

)

LESS THAN i

j 1100 326 365

[

1 i

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

exit thermoeges -

QQIQ Step 19.

l i

GREATER N REQUIRED SUBCOOLING 1

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

GREA*ER TMAN 15 %

RETURNIQ Step 10.

(35 % FOR ADVERSE CONTAINMENT) j

j. Stop second HPSI pump i

14 CONDOL CHARGING FLOW i

TO MAINTAIN PRZR IIVEL f

GREATER THAN 15 %

i

( 35 % FOR ADVERSE CONTAINMENT)

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Page 10 of 17

JUN 0 319M NISmER TmL REV. ISSUE /DATE ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED F

7 i

CAUTION:

IF RCP SEAL COOlJNG FLOW HAD PREVIOUSLY BEEN LOST THE AFFECTED RCP(s) SHOULD NOT BE STARTED PRIOR TO AN ENGINEERING STATUS EVALUATION.

L J

1 NOTE:

RCPs SHOULD BE RUN IN ORDER OF PRIORITY TO PROVIDE NORSfAL PRZR SPRAY.

15 CliECK RCP STATUS:

a. Check RCPs -
a. Try to start cne RCP:

l AT LEAST ONE RUNNING

1. Establish conditions fcr staning an RCP:
a. Place a jumper across designated terminals on # 2 horizontal terminal board in upper RCP breaker cabinet:

RCP Terminal #

Wire #

I 8 to 9 Pl71P2 to Pl71P4 2

8 to 9 Pl72P2 to F172P4 3

8 to 9 Pl7TP2 to Pl73P4 4

8 to 9 Pl74P2 to Pl74P4

b. Start oillift pump.

l

c. Insure seal water and component i

cooling water supplied to RCP.

d. Insure lower bearing temperature is less than 170' F.
e. Check RCS pressure greater than 300 PSIG.
f. Open Cli TV 240,Cll W 241 and Cli TV 334.

(seal water return trip valves) j

g. Open CC TV 1411 (oil cooler CCW return trip valve)
h. Open seal water return MOV.
2. Start selected RCP, lE RCP can b'QI be started, i

IllES verify natural circulation l

(SEE ATTACllMENT A).

IE natunt circulation b'DI verified, I

T11EN increase dumping steam i

from intact SG(s).

Page 11 of 17

JUN 0 31988 NUMBER TTTU REY. ISSUESATE ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15

b. Stop all but # 3 RCP QR # 4 RCP

'9 r

CAUTION:

VOIDING MAY OCCUR IN THE RCS DURING RCS DEPRESSURl2ATION. THIS WILL RESULTIN A RAPIDLY INCREASING PRZR LEVEL.

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16 DEPRESSURIZE RCS TO MINIMIZE RCS SUBCOOLING:

a Use normal PRZR spray

a. Use one PRZR PORV.

IE no PORV available, WEN use auxiliary spray,

b. Depressurize RCS untileither one of the following conditions is satisfied:

I o PRZR level.

i GREATER TIIAN 76 %

i (69 % FOR ADVERSE CONTAINMENT) l I

.Qa I

o RCS subcooling based on core exit thennocoup'les.

APPROACIILNG 32 F (SEE OPPOSITE P AGE FOR ADVERSE COSTAINMEST) l 17 VERIFY ADEQUATE SIIUTDOWN MARGIN:

a. Sample RCS
b. Check shutdown margin.
b. Borate RCS as necessary.

ADEQUATE i

Page 12 of 17 1

JUN 03 588 NUMBER 1TIU REY. lSSLTJDATE ES 1.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION I

STEP ACT10N/ EXPECTED RESPONSE RESPONSE NOT OBTAINED I

18 CHECK RCS TEMPERARJRE:

i

a. Check RCS temperature -
a. Continue RCS cwidown LESS DIAN 300* F WHEN RCS temperature is l

less than 300' F, THEN perform steps 18 b and c.

l

b. Stop HPSI pump
c. Start LPSI pump IF required l

l

d. Check RCS pressure -
d. Stop RCPs.

GREATER THAN 300 PSIO 19 VERIFY Si FLOW NOT REQUIRED:

a. Check RCS subcooling based on
a. Manually operate charging core exit thermocouples -

QR SI pumps as necessary, GREATER DIAN 32' F QQIQ Step 20.

(SEE OPPOSITE PAGE FOR ADVERSE CONTAINMENT)

b. Check PRZR level-
b. Manually operate charging l

GREATER THAN 10 %

QB Si pumps as necessary, (24 % FOR ADVERSE RETURN 1Q Step 10.

j CONTAINMENT) i l

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Page 13 of 17

JUN O 31986 NUMBER TTH E.

REV. ISSLTA)A1T ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION 1

STEP ACT10N/ EXPECTED RESPONSE I

RESPONSE NOT OBTAINED 20 CHECK IF DIESEL GENERATORS SHOULD BE STOPPED:

i

a. Verify ac emergency buses energized -
a. Try to restore off site power to l

BOTil TRAINS BY OFF SITE both trains.

POWER (SEE OPPOSITE PAGE) l BUSES 8. 4 and 5 E KQI restored.

D32 THEN check the following equipement ;

BUSES 9. 6 and 7 loaded on the ac emergency buses:

i

1. htCC 5.

l

2. Control air compressors.
3. Semi vital 120 V buses.
4. Clowd cooling system pumps.
5. Battery charger I A.
6. One component cooling water i

i pump.

7. One savice water pump for each diesel generator.
8. E senice water is supplied to l

RHR heat exchangers, THEN ute at least two senice water pumps.

l

9. Start CARFANS as required to limit containment pressure and t

temperature, j

b. Stop any unloaded diesel generator and place it in standby 1

(SEE OPPOSITE PAGE) 21 CHECK RCP COOLING SYSTEhtS:

ESTABLISH NORhiAL COOLING FLOW TO RCPs, I

o RCP CCW System flow-NORhiAL IN ACCORDANCE WITH.

j o RCP sealinjection flow NORhtAL NOP 2.81, l

OPERAT10N OF COhtPONENT COOLING SYSTEht.

M'I2 NOP 2.6-1 SEAL WA'ER STAR 7UP NORhtAL OPERATION.

j 22 CHECK IF RCP SEAL WATER STOP AFFECED RCP(s).

l RETURN FLOW (s)IS GREATER ' IRAN 0.2 GPhi i

I Page 14 of 17

JUN 0 3198e NLMBER TTT12 REY.1SSUEMATE ES 1.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION i

t I

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 23 CIIECK SOURCE RANGE DEDICTORS ENERGIZED:

I i

a. Check intermediate range flux -
a. Continue with step 24 j

LESS THAN 5 x 10'10 AMPS WHEN less than 5 x 10'30 AMPS, TiiEN do steps 23 b, c and d.

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b. Verify source range detectors -
b. Manually energize source range ENERG1 ZED detectors.

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c. Transfer nuclear flux recorders i

to wurce range scale I

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d. Transfer SUR meters to source i

range 24 SliUT DOWN UNNECESSARY PLANT EQUIPMENT i

a. Stop one main feedwater pump i
b. Stop one condensate pump l

i

c. Place standby heater drain pump in TPO
d. Place running heater dnin pump in TPO i

25 CliECK IF RCPs MUST BE I'

SilUTDOWW:

a. Check the following:
a. QQ IQ Step 26, o Number 1 seal differential-l LESS THAN 275 PSIG Oli o Number i sealleakoff flow -

LESS THAN 0.2 GPM

b. Stop affected RCP(s) f I

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Page 15 of 17

JUN 0 31988 butBER EU REV. ISSUE /DATE i

l ES.I.2 POST LOCA COOLDOWN AND Rev.3 DEPRESSURIZATION l

1 STEP ACT10N/EXPEC7ED RESPONSE RESPONSE NOT OBTAINTD 26 CHECK IF RHR SYSTEM CAN BE PLACED IN SERVICE:

I

a. Check the following:
a. QQ IQ Step 27.

o RCS tem xrature -

j LESS DiAN 300' F i

(277' F FOR ADVERSE CONTAINMENT) l l

I o RCS pressure.

LESS THAN 300 PSIG (t 310 PSIG FOR ADVERSE COhTAINMENT)

b. Consult plant engineering staff to determine RHR lineup:

o RHR system in service IN ACCORDANCE WTTH l

l NOP 2.91, l

i RHR SYSTEM PLACING SYSTEM i

i IN SERVICE

{

g o RHR system in service IN ACCORDANCE WTTH ES 1,3, 1

TRANSFER TO RHR i

RECIRCULATION l

l 27 CHECK RCS TEMPERATURE RETURN IQ STEP 5.

l LESS THAN 200* F l

28 EVALUATE LONG TERM PLANT STAUJS.

l

a. Maintain cold shutdown conditions f
b. Consult plant engineering staff

(

I END i

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JUN 0 31983 i

I NUMBER EU REY. lSSUE,DA3 j

ES.I.2 POST LOCA COOLDOWN AND Rev.3 i

DEPRESSURIZATION

[

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[

l, ATTACHMEST A i

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De following conditions support or indicate natural circulation flow:

{.

l o

RCS subcooling based on cort exit thermocouples is greater than 32' F.

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o SG pressures are stable or decreasing.

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o RCS temperature based on core exit thermocouples and average temperature indications i

is stable or decreasing.

{

t RCS cold leg temperatures are at saturation temp;rature for SO pressures, j

o t

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