ML20204J633

From kanterella
Jump to navigation Jump to search
Rev 4 to Emergency Operating Procedure ES-0.4, Natural Circulation Cooldown W/Steam Void in Vessel (W/O Rvlis)
ML20204J633
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-.4, ES-0.4, NUDOCS 8810250198
Download: ML20204J633 (13)
v • d • e


Text

r* JUN 0 31988

  • NUhGEP TTT12 REV. ISSUE /DATE i E bC. ': NATURAL CIRCULATION COOLDOWN WITH Rev. 4 STEAM VOID IN VESSEL (WITHOUT RVLIS)

(,

i A. PURPOSE l l

This procedure provides actions to cor.tinue plant cooldown and depressurization to cold  !

shutdown, with no accident in progress, under conditions that allow for the potentia] formation of a void in the upper head r:gion without a vessel level system available to monitor void growth.

B. SYMPTOMS OR ENTRY CONDITIONS This procedure is entered from ES-0.2, NATURAL CIRCUL ATION COOLDOWN, ,

after completing the first thineen steps. i i

i l

1 i

Page 1 ef 13 8810250198 001007 PDR ADOCK 05000213 P PDR

l JUN 0 31989 NUMBER TTII.E REV. ISSUE /DATE .

ES.O.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4  :

STEAM VOID IN VESSEL (WITHOUT RVLIS)

(

STEP ACTIO / EXPECTED RESPONSE RESPONSE NOT OBTAIhTD l

r 7  !

CAUTION: o IF SI ACTUATION OCCURS DURING THIS PROCEDURE, E 0, REACTOR TRIP OR SAFETY INJECTION, SHOULD BE PERFORSfED.

o THE FIRST THIRTEEN STEPS OF ES 0.2, NATURAL CIRCULATION COOLDOWN, SHOULD BE PERFORSfED BEFORE CONTINUING WITH THIS PROCEDURE.  !

L J l

NOTE: o FOLDOUT PAGE SHOULD BE OPEN.

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

o IF CONDITIONS CAN BE ESTABLISHED FOR STARTING AN RCP DURING THIS PROCEDURE, STEP 1 SHOUL.D BE REPEATED.

1 TRY TO START AN RCP:

a. Chec': PRZR level - a. Control charging and letdown GREATER THAN 75 % as necessary to increase PRZR level to greater than 75 %. I i
b. Check RCS subcooling based b. Establish subcooling greater on core exit thermocouples - than 60* F by dumping steam.

GREATER THAN 60* F Page 2 of 13

JUN O 31988 NUMBER TITLE REV. ISSUE /DATE ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4 i STEAM VOID IN VESSEL (WITHOUT RVLIS) l

(

ST1EP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1 c. Establish conditions for starting an RCP: c. EQIQ Step 2

1. Close loop Tc isolation valve -

i i

2. Open loop bypass valve
3. Stan oilItft pump
4. Insure seal water and component '

cooling water supplied to RCP

5. Insure lower bearing temperature l is less than 170' F
6. Check RCS pressure j greater than 300 PSIG ,
7. Check open CH-TV-240, 7. Open CH TV-240, CH TV 241 CH-TV 241 and CH TV-334, and CH TV 334.

(scal water return trip valves)

8. Check o pen CC-TV-1411 8. Open CC TV 1411 (RCP oil cooler CCW return trip valve)
9. Open seal water return MOV
d. Stan selected RCP d. IE RCP did EQ_I start, THEN perform the following: THEN perform the following:
1. Open loop Tc isolation valve 1. Open loop Tc isolation valve
2. Close loop bypass valve 2. Close loop bypass valve j QQIQ Step 2.
e. Align PRZR spray valves
f. GQIQ NOP 2.3 4, HOT STANDBY TO COLD j SHUTDOWN, Step 1 ,

i i NOTE: SATURATED CONDITIONS IN THE PRZR SHOULD BE ESTABUSHED BEFORE TRYING TO DECRESASE PRZR LEVEL.

2 ESTABLISH PRZR LEVEL TO ACCOMMODATE VOID GROWITI:

a. Check PRZR level- a. Control charging and letdown BETNEEN 20 % AND 25 % as necessary to establish level.

I

b. Place PRZR level controlin manual Page 3 of 13

JUN 0 3198e NUMBER TTR E REV. ISSUE /DAE I ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4  !

STEAM VOID IN VESSEL (WITHOUT RVLIS)  ;

l STEP ACTION /EXPECED RESPONSE RESPONSE NOT C JTAINED 3 DECREASE CORE EXIT THERhiOCOUPLES TO 500* F:

a. hiaintain cooldown rate in RCS cold legs -

LESS THAN 50' F / HR

b. hiaintain RCS pressure -

AT 1750 PSIG  !

c. hiaintain RCS temperature and pressure -

WITHIN LIhilTS OF TECHNICAL SPECIFICATIONS SECTION 3.4, FIGURE 3.4 9

d. hiaintain stable PRZR level using charging
e. Check core exit thermocouples - e. RE'lliR.N IQ Step 3 a.

LESS THAN 500' F

f. Stop RCS cooldown l I

,* r--

CAUTION: INSURE St ACTUATION SIGNAL IS BLOCKED PRIOR TO DEPRESSURIZING THE RCS.

L J 4 DEPRESSURIZE RCS TO 1600 PSIG:

a. Check letdown IN SERVICE a. Use one PRZR PORV.

QQIQ Step 4 c.

b. Use auxiliary spray
c. Check RCS pressure -

LESS THAN 1600 PSIG c. RETURN IQ Step 4 a.

d. Stop RCS depressurizathn h

Page 4 of 13

JUN 0 31988 j NUMBER TITLE REV. ISSUE /DATE i ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4 1 1

STEAM VOID IN VESSEL (WITHOUT RVLIS)  ! l

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OB RAINED 5 DECREASE CORE EXIT  :

UIERMOCOUPLESTO450 F:  ;

a. Maintain cooldown rate in RCS l cold legs - l LESS THAN 100* F / HR i
b. Maintain RCS pressure - ,

AT 1600 PSIG I

c. Maintain RCS temperature and  ;

pressurc - ,

WITHIN LIMITS OF TECHNICAL i SPECIFICATlONS SECTION 3.4, FIGURE 3.4 9

d. Maintain stable PRZR level using charging I
e. Check core exit thermocouples - e. RETURN T_Q Step 5 a.

LESS DIAN 450* F

f. Stop RCS cooldown  !

l 6 EQUALIZE CHARGING AND i LEEOWN FLOWS: l

a. Place charging and letdown

'ontrols in manual

b. Control charging and seali *ection  !'

flows to equalletdown and al leakoff flows 7 MAINTAIN RCP SEAL INJECTION FLOW: 5 l'

a. 'Thronle seal supply valves  !

(CH V 354A through D) to maintain labyrinth differential pressure between 5" and 10" of water pressure Page 5 of 13

JUN03iSSF l

. NUMBER TIT 12 REV. ISSLT/DATE  !

ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4 STEAM VOID IN VESSEL (WITIIOUT RVLIS)  ;

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: THE UPPER HEAD REGION MAY VOID DURING DEPRESSURIZATION. THIS WILL RESULTIN A RAPIDLY INCREASING PRZR LEVEL.

i I l 8 DEPRESSURIZE RCS TO 800 PSIG: l l

a. Checkletdown-IN SERVICE a. Use one PRZR PORV. l QQIQ Step 8 c. -

- b. Use auxiliary spray

c. Depressurize RCS until either one of the following conditions is satisfied:

o RCS pressure -

LESS THAN 800 PSIG QR o PRZR level - i GREATER THAN 90 % <

d. Stop RCS depressurization I

NOTE: IN ORDER TO CONTINUE OVERALL SYSTEM DEPRESSURIZATION, IT MAY BE NECESSARY TO CYCLE PRZR LEVEL (CYCLE PRESSURE) TO ENHANCE UPPER HEAD COOUNG.

9 CliECK PRZR LEVEL INCREASE RCS PRESSURE BY LESS THAN 90 % 100 PSIG USING PRZR HEATERS. .

RETURN IQ STEP 8.

I i

Page 6 of 13

JUN 0 31988 NUMBER TTTLE REV.13 SUE /DATE ES.O.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4 STEAM VOID IN VESSEL (WITHOUT RVLIS)

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 10 DECREASE CORE EXIT EEPJ.10 COUPLES TO 400 F:

a. Maintain cooldown rate in RCS cold legs -

LESS THAN 100* F / HR

b. Maintain RCS pressure -

STABLE

c. Maintain RCS temperature and pressure -

WITHIN LIMITS OF TECHNICAL SPECIFICATIONS SECTION 3.4, FIGURE 3.4 9

d. Maintain stable PRZR level using charging
e. Check core exit thermocouples - e. RETUILN IQ Step 10 a.

LESS THAN 400' F

f. Stop RCS cooldown j 11 EQUALIZE CHARGING AhD  !

LE1DOWN FLOWS: l

a. Place charging and letdown  !

controls in manual  !

b. Control charging and sealinjection flows to equal letdown and seal leakoff flows Page 7 of 13 fL

I JUN 0 31988

. NUMBER Tm.E REY. ISSUE /DAE ,

ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4  !

STEAM VOID IN VESSEL (WITHOUT RVLIS) l

[

STEP ACTION /EXPECED RESPONSE RESPONSE NOT OBTAINED 12 DEPRESSURIZE RCS TO 600 PSIO:

I

a. Check letdown -IN SERVICE a. Use one PRZR PORV.

EQIQ Step 12 c. l l

b. Use auxiliary spray  ;
c. Depressurize RCS until either '

one of the following conditions is satisfied: f o RCS pressure - l LESS THAN 600 PSIG l QR o PRZR level -

GREATER THAN 90 %

i

d. Stop RCS depressurization 13 CHECK PRZR LEVEL INCREASE RCS PRESSURE BY LESS THAN 90 % '00 PSIG USING PRZR HEATERS.  !

RETURN IQ STEP 12. j i

l 1

l Page 8 of 13

JUN 0 31988  !

NUMBER TTTLE REV. ISSUE /DATE ,

ES.O.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4 l STEAM VOID IN VESSEL (WITIIOUT RVLIS) l t

SEP ACTION / EXPECTED RESPONSE l RESPONSE NOT OBTANED ,

1 r , '

CAUTIONt THE SI SYSTEbf hfUST BE DISABLED BEFORE RCS TEbfPERATURE IS LESS THAN 315

  • F.

L J 14 DISABLE THE SI SYSTEM:

a. Check core exit thermocouples - a. Continue RCS cooldown.

LESS THAN 350 F WHEN core exit thermocouples are l less than 350' F.,

b. Align core cooling equipment IN ACCORDANCE WTTH NOP 2.3 4, HOT STANDBY MODE 3 TO COLD SHUTDOWN MODE 5 AS2 NOP 2.121, CORE COOLING SYSTEM LINEUP FOR SHUTDOWN AND AT POWER I OPERATION  !

I i

l i

i I

I I

I i

i Page 9 of 13

JUN 0 31988 l

NUMBER TITLE REV. ISSUE /DATE  !

ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4  !

STEAM VOID IN VESSEL (WITHOUT RVLIS) i

( -

STEP ACTION /EXPECIED RESPONSE RESPONSE NOT OBTAINED 1

15 DECREASE CORE EXIT '

l '

11IERMOCOUPLES TO 300* F

a. Maintain cooldown rate in RCS cold legs -

LESS THAN 100* F / HR

b. Maintain RCS pressuit -  !'

STABLE

c. Maintain RCS temperature and pressure -

WITHIN LIMITS OF TECHNICAL SPECIFICATIONS SECrlON 3.4, FIGURE 3.4 9

d. Check core exit thermocouples - d. RETURNIQ Step 15 a.

LESS THAN 300' F

f. Stop RCS cooldown 16 EQUALIZE CHARGING AND LE1DOWN FLOWS:
a. Place charging and letdown i controls in manual j
b. Contml charging and seal injection j flows to equalletdown and seal leakoff flows Page 10 of 13

JUN 0 31988 NUMBER THE REV. ISSUE /DATE I ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev. 4 j STEAM VOID IN VESSEL (WITHOUT RVLIS) i

(

5TEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 17 DEPRESSURIZE RCS TO 300 PSIG: i

a. Check letdown -IN SERVICE a. Use one PRZR PORV.

QQIQ Step 17 c. i l

b. Use auxiliary spray
c. Depressurize RCS until either one of the following conditions I

is satisfied o RCS pressure -

LESS THAN 300 PSIG OR o PRZR level-GREATER THAN 90 %

d. Stop RCS depressurization 18 CHECK PRZR LEVEL INCREASE RCS PRESSURE BY LESS THAN 90 % 100 PSIG USING PRZR HEATERS.  !

RETUR'.'IQ STEP 17. l 19 CHECK IF RHR SYSTEM CAN BE f PLACED IN SERVICE: I

a. Check RCS te - a. RETURN IQ Step 15.

LESS THAN F l

b. Check RCS pressure - b. BEIURNIQ Step 17.

LESS THAN 300 PSIG i

c. Place RHR in service IN ACCORDANCE WITH NOP 2.91, RilR SYSTEM PLACING SYSTEM IN SERVICE 20 CONTINUE RCS COOLDOWN TO COLD SHUTDOWN l

1 Page 11 of 13

l JUN 0 31988 ,

I NUMBER TTT12 REV. ISSUE /DATE ]

ES 0.4 NATURAL CIRCULATION COOLDOWN WITH Rev.4  :

STEAM VOID IN VESSEL (WITIIOUT RVLIS) l t

S11P ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD r 1 i CAUTION: DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS THAN 200* F MAY RESULTIN ADDITIONAL VOID FORMATION IN THE RCS. l L J l I

21 CONTINUE COOLDOWN OF f INACTIVE PORTION OF RCS: i

a. Cool upper head region using l CRDM fans l
b. Cool SG U tubes by dumping steam from all SGs 22 DETERMINE IF RCS DEPRESSURIZATION IS PERMITTED:
a. Check entire RCS temperature - a. DO NOT DEPRESSURIZE RCS.

LESS THAN 200' F RETURNIQ Step 20.

l

b. CD IQ NOP 2.3-4, >

HOT STANDBY MODE 3 TO COLD  ;

SHUEOWN MODE 5 END l l

I t

l t

l l

U Page 12 of 13

JUN 0 31983 REV. ISSUE /DAE Rev 4 FOLDOUT ERR E-D SERIES PROCEDURES

1. ' RCEBIE CRITERIA IE BOTH of the following conditions exist.

THEN t2ip all RCPs:

a. HPSI pump QR charging pump - AT LEAST ONE RUNNING
b. RCS Pressure - LESS THAN 1150 PSIG (1380 PSIG FOR ADVERSE CONTAINhiENT).

2 IE any of the following conditions occur,

'IEENimmediately trip all RCPs:

o Loss of component cooling water to RCPs.

o Complete loss of control air.

o Complete loss of htCC 5 M semi vital power, o Loss of either banery Bus A QR battery Bus B.

( RCPs with de control power supplied from the effected battery bus must be tripped locally).

OR IE any RCP motor bearing temperature reaches 200' F.

THEN trip the effected RCP.

2. SI ACTUATION CRITERIA IE EITHER condition listed below occ rs, actuate SI, THEN O_Q Q IQ E 0, REACTOR TRIP OR S AFETY INJEC110N, Step 1.

o RCS subcooling based on core exit thermocouples LESS THAN 32' F.

o PRZR level CANNOT BE hiAINTAINED GREA'IER THAN 10%

(24% FOR ADVERSE CONTAINhiEST).

3. EER PATH SUhihfARY
a. SUBCRITICALLY - Nuclear power greater than 5%.
b. CORE COOLING - Core exit thermocouples greater than 1200* F.
c. HEAT SINK - Wide range level in all SGs less than 63%

(67% for adverse containment)

M total feedwater flow less than 320 GPht.

d. INTEGRITY - Cold leg temperature decreases greater than 100' F in last 60 minutes M RCS cold leg temperature less than 231' F.
c. CONTAINhiEST- Containment pressure greater than 40 PSIG.

4 M SUPPLY h1AKEUP CRITERION Start makeup to DWST before level decreases to 54,000 gallons, i

Page 13 of 13

Retrieved from "https://kanterella.com/w/index.php?title=ML20204J633&oldid=3062370"