ML20204J565

From kanterella
Jump to navigation Jump to search
Rev 3 to Emergency Operating Procedure ES-0.2, Natural Circulation Cooldown
ML20204J565
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-.2, ES-0.2, NUDOCS 8810250179
Download: ML20204J565 (10)
v • d • e


Text

__

t NUMBER TTT U REY. ISSUE /DATE E S.0.2 NATURAL CIRCULATION COOLDOWN Rev. 3 JUN 3 1988

(

A.

PURPOSE This procedure provides actions to perfonn a natural circulation RCS cooldown and l

depressurization to cold shutdown, with no accident in pmgress, under requirements that j

will preclude any upper head void fonnadon.

R.

SYMPTOMS OR ENTRY CONDITIONS l

This procedure is entered from:

1.

ES 0.1, REACTOR TRIP RESPONSE, Step 15, when it has been determined that a natural ctreuladon coldown in required.

l l

2.

ECA 0.1, STATION BLACKOUT WITHOUT SI REQUIRED, Step 20.

i i

I i

i i

l 4

1 f

i l

I l

i

+

t l

c

)

l T

I i

l t

I i

l Page 1 of 10 8810250179 801007 PDR ADOCK 05000213 P

POR

SMGER M

REV. ISSUE /DATE ES.O.2 NATURAL CIRCULATION COOLDOWN Rev.3 t

JUN. 3.M 8

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

I

)

i CAUTIONt IF St ACTUATION OCCURS DURING THIS PROCEDURE, E 0, I

REACTOR TRIP OR SAFETY INJECTION, SHOULD BE PERFORSIED.

l L

J NOTEt o

FOLDOUT PAGE SHOULD BE OPEN.

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

o IF CONDITIONS CAN BE ESTABUSHED FOR STARTING i

AN RCP DURING THIS PROCEDURE, STEP 1 SHOULD BE l

REPEATED.

l 1

TRY TO START AN RCP:

l

a. Establish conditions for starting an RCP:
a. QQIQ Step 2
1. Close too Te isolation valve 1
2. Open 100 bypass valve j
3. Start oil pump 4.

Insure seal water and com x>nent l

cooling water supplied to 3CP

5. Insure lower bearing temperature is less than 170* F
6. Check RCS pressure i

greater than 300 PSIG

7. Check open Cll TV 240,
7. Open Cil TV 240, Cil TV 241 CH TV 241 and CH TV 334, and Cil TV 334.

(scal water return trip valves)

8. Check open CC TV 1411
8. Open CC TV 1411 (RCP oil cooler CCW rerum trip valve)
9. Open seal water rerum MOV
b. Start selected RCP b.1E RCP did b'QI start, i

'HIEN perform the following:

B IEN perform the following:

1. Oxn loop Tc isolation valve
1. Open loop Te isolation valve
2. Close loop bypass valve
2. Close Imp bypass valve l

QQ IQ Step 2.

c. Align PRZR spray valvea
d. GDIQ NOP 2.3 4 HOT STANDBY TO COLD SHUTDOWN, Step i Page 2 of 10

NUMBER TTTLE REV. ISSLTA) ATE ES.0.2 NATURAL CIRCULATION COOLDOWN Rev.3 JUN 3 1988

(

STEP ACT10NEXPECTED RESPONSE RESPONSE NOT OBTAINED i

2 CALCULAH COLD SHUTDOWN l

BORON CONCENTRATION i

IN ACCORDANCE Willi SUR 5.319 BORATION REQUIREMENTS FOR REACTOR SHUTDOWN 3

BORATE T11E RCS TO COLD SHU1DOWN BORON CONCENTRATION IN ACCORDANCE WTni NOP 2.6 3, CVCS CHEMICAL SHIM CONIROL

a. Check MCC-8 ENERGIZED
a. Energize MCC 8.

4 VERIFY RCS AT COLD SHUTDOWN RETURNIQ STEP 3.

BORON CONCENTRATION BY I

SAMPLING:

I o Imp 1 hot leg sample connection I

o Any loop through the drain header sample connection 5

GiECK VCT MAKEUP CONTROL SYSE M:

a. Check VCT makeup blender ratio-
a. Adjust makeup blencer ratio to cold i

SET FOR COLD SHUTDOWN shutdomi boron concentration.

BORON CONCENTRATION

b. Check VCr makeup controls -
b. Place makeup controls in automatie.

IN AUTOMATIC l

I 6

VERIFY ALL CRDM FANS RUNNING START ALL AVAILABLE I

CRDM FANS.

i i

t I

l Page 3 of 10

NUMBER TTTLE REV. !SSLTJDATE ES 0.2 NATURAL CIRCULATION COOLDOWN Rev.3 JUN 31985 i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD 7

i F

CAUTION:

Af0NITOR DWST LEVEL. START AfAKEUP TO DWST BEFORE r

LEVEL DECREASES TO $4,000 GALLONS.

L J

7 INITIATE RCS COOLDOWN TO COLD SIIU1DOWN:

a. hiaintain cooldown rate in RCS cold legs -

LESS DIAN 25' F/ HR

b. Dump stearn to the condenser
b. Dump steam using one OH more of the following:
1. Atmos 3heric steam dump valve.

l

2. Terry "urbine steam supply valves.,
3. liog Jet steam supply valves.

I

c. hiaintain SG wide range level-
c. Control AUX feedwater flow as l

BEBVEEN 63 % AND 69 %

necessary to contml SG levels.

d. hiaintain RCS temperature and i

pressure -

WIDIIN LIhtITS OF TECTINICAL SPECIFICATIONS SECTION 3.4, FIGURE 3.4 9 8

CiiECK CORE EXTT TITERh!OCOUPLE RETURN IQ STEP 6.

TEhtPERATURES LESS T11AN 550' F l

i l

l

\\.

Page 4 of 10

\\

NWiBER TTTE REV.15St.T./DATE ES 0.2 NATURAL CIRCULATION COOLDOWN Rev.3 JUN 3N STEP ACDON/ EXPECTED RESPONSE RESPONSE NOT OBTAINED 9

DEPRESSURIZE T11E RCS TO 1790 PSIG:

a. Check letdown IN SERVICE
a. Try to establish let down (SEE OPPOSITE PAGE) i IE letdown can EQIbe established,

'IIIEN use one PORV.

G.Q IQ Step 10, OBSERVE CAUTION PRIOR TO STEP 10.

b. Use auxiliary spray l

r 7

CAU'1 ION:

SI ACTUATION CIRCUITS WILL AUTOMATICALLY UNBLOCK WHEN PRZR PRESSURE INCREASES TO GREATER THAN 1873 PSIG.

I L

J I

10 BLOCK SI ACTUATION USING SI BLOCK SWITCli 11 MAINT.ilN TIIE FOLLOWING RCS CONDITIONS:

o RCS pressure -

BETWEEN 1720 PSIG AND 1800 PSIG o PRZR ievel-BE'IWEEN 25 % AND 50 %

o Cooldown rate in RCS cold legs -

LESS T11AN 25' F/ IIR o RCS temperature and pressure -

WITlilN LIMITS OF TEClINICAL SPECIFICATIONS SECrlON 3.4, FIGURE 3.4 9 i

t i

Page 5 of 10

NMiBER TUM REY. ISSUE /DATE ES 0.2 NATURAL CIRCULATION COOLDOWN Rev.3 i

JUN 3 1985

(

SEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTALNED 12 h10NITOR RCS COOLDOWN:

o Check core exit thermocouples -

'r DECREASING o Check RCS cold leg temperatures -

DECREASINO o Check RCS subcooling based on core exit thermocouples -

i INCREASINO i

i NOTEt IF AT.WY TISfE IT IS DETER &flNED THAT A NATURAL CIRCULATION COOLDOWN AND DEPRESSUR17ATl0N SfUST BE I

]

PERFORSfED AT A RATE THAT SfAY FORSt A STEASI VOID IN THE l

REACTOR VESSEL, PROCEDURE ES 03 OR ES 0.4 SHOUID BE 8

i USED.

l i

i i

i 13 INITIA111 RCS DEPRESSURIZATION:

a. Check CRDht fans ALL RUNNING
a. htaintain RCS subcooling based on core exit thermocouples greater than 200* F.

j GQIQ Sep 13 c.

l I

b. hiaintain RCS subcooling based on l

core exit thermocou sles -

GREATER THAN 32' F

{

i

c. Check letdown IN SERVICE
c. Depressurize RCS using one PORV.

QQIQ Step 14 I

d Use auxiliary spray l

1 1

7 i

i

(

1 I

Page 6 of 10 i

t i

NUMBER TTI12 REV. ISSUE /DATE ES 0.2 NATURAL CIRCULATION COOLDOWN Rev.3 i

JUN --'HS88 l

ACTION /EXPEC1ED RESPONSE RESPONSE NOT OBTAINED STEP 14 CONTINUE RCS COOLDOWN AND DEPRESSURIZATION:

l a Maintain cooldown rate in RCS cold legs.

LESS 'llAN 25' F/ HR

b. Maintain subcooling requirements specified in step 13 i

c Maintian RCS temperature and l

pressure-WITHIN LIMITS OFTECHNICAL SPECIFICATIONS SECTION 3.4, FIGURE 3.4 9 l

d. Check RVLIS alenum indication -
d. Repressurize RCS within limits of i

GREAT 11R THAN 84 %

Technical Specifications section 3.4, Figure 3.4 9 to collapse potential voids in RCS, ASD continue cooldown.

i IE RCS depressurization must i

continue, i

IllES GQ IQ ES 0.3, NATURAL CIRCULATION l

COOLDOWN WIT 11 STEAM VOID I IN VESSEL (WITH RVLIS), Step 1. i i

I I

15 CHECK IF SOLID PLAhT t

CONDITIONS SHOULD BE ESTABLISHED:

a. Check PRZR steam phase temperature -
a. Continue RCS cooldown and LESS TilAN 450' F depressurization, l

WHEN PRZR steam phase temperature is less than 450' F.

I 11iEN do step 15 b.

l I

b. Increase PRZR level to 100 %

r i

I i

i i

i

[

Page 7 of 10 I

t I

l NUMBER Tm2 REY. !SSUESATE ES 0.2 NATURAL CIRCULATION COOLDOWN Re g 3 g

(

l STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION:

THE SI SYSTEM MUST BE DISABLED BEFORE stCS TEMPERATURE IS LESS THAN 315

  • F.

I 16 PERFORht COLD SHUTDOWN ALIGh%iEST:

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

LESS MAN 350' F WHEN core exit thermocouples are 1

less than 350' F.,

TilEN do step 16 b, e and d.

b. Align core cooling equipment IN ACCORDANCE WTill i

NOP 2.3 4, IIOT STANDBY StODE 3 TO i

COLD SliUTDOWW htODE 5 i

ASI2 1

NOP 2.121, CORE COOLING SYSTEh! LINEUP FOR SIIUTDOWN AND AT POWTR l

OPERAT10N 1

c. Check iflow temperature over
c. MIES all conditions are satisfied, pressure protection relief valves THEN do step 16 d.

should be placed in senice:

1 Check PRZRlevel SOLID

2. Check RCS temperatun -

LESS 'IllAN 325' F l

3. Check PRZR temperature -

LESS TilAN 430' F

4. Check RCS pressure -

LESS MAN 325 PSIG

d. Place low temperature over j

pressure protection relief valves m semce IN ACCORDANCE %TTil NOP 2.3 4, llOT STANDBY htODE 3 TO COLD j

SliUTDOWN.51 ODE 5 1

Page 8 of 10 i

1

NWIBER TTTLE REV. lSSLTsDATE ES 0.2 NATURAL CIRCULATION COOLDOWN Rev.3 JUN L1986 l

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD 17 MAlhTAIN LETDOWN FLOW:

a. Open letdown orifice isolation valves (LD.AOV 202, LD AOV 7.03, and LD AOV 204)as necessary
b. Adjust setpoint ofletdown low pressure regulating valve (LD-PCV 113) as necessary 18 MAlhTAIN RCP SEAL INJECTION FLOW:
a. Thrott!c: seal supply valves l

(CH V.354A through D) to maintain labyrinth differential pressure betw een 5" and 10" of water pressure 19 CliFCK IF RHR SYSTai CAN BE PLACED IN SERVICE:

l

a. Check RCS tem ture -
a. RETURN IQ Step 14.

LESS THAN

  • F
b. Check RCS pressure -
b. RETURN IQ Step 1.s.

LF.SS TIIAN 300 PSIG

c. Place RHR in senice IN ACCORDANCE WTDI NOP 2.91, RHR SYSTai PLACING SYSTEM IN SERVICE 20 COSTINUE RCS COOLDOWN TO COLD SHITTDOWN Page 9 of 10

NUMBER TITLE REV. ISSUE /DATE E S.0.2 NATURAL CIRCULATION COOLDOWN Rev.3 JUN-31988 l

STEP ACTION / EXPECTED RESPON3E RESPONSE NOT OBTAINED r

7 CAUTION:

DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS THAN 200

  • F AIAY RESULT IN VOID FORAfATION IN THE RCS.

L J

21 CONTINUE COOLDOWN OF INACITVE PORTION OF RCS:

o Cool upper head region using CRDM fans o Cool SG U tubes by dumping steam from all SGs 22 DETERhtLNE IF RCS DEPRESSURIZATION IS PERhirITED:

s. Check entire RCS temperature -
a. DO NOT DEPRESSURIZE RCS.

LESS THAN 200* F RETURN IQ Step 20.

b. GO 10 NOP 2.3 4, HOT STANDBY MODE 3 TO COLD l

SmTIDOWN MODE 5 END f

I l

l l

l Page 10 of 10

- _ _ _

Retrieved from "https://kanterella.com/w/index.php?title=ML20204J565&oldid=4066082"