ML20204J627

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Rev 3 to Emergency Operating Procedure ES-0.3, Natural Circulation Cooldown W/Steam Void in Vessel (W/Rvlis)
ML20204J627
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-.3, ES-0.3, NUDOCS 8810250195
Download: ML20204J627 (8)
v • d • e


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hMiBER EM REY. !SSl!E/DATE ES.O.3 NATURAL CIRCULATION COOLDOWN WITH Rev. 3 STEAM VOID IN VESSEL (WITH RVLIS)

JUN 31988

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A.

PURPOSE l

This procedure provides actions to continue plant cooldown and depressurization to cold j

shutdown, with no accident in progress, under conditions that allow for the potential formation of a void in the upper head region with a vessel level system avaliabic to monitor void growth.

B.

SYMPTOMS OR ENTRY CONDITIONS This procedure is entered from ES 0.2, NATURAL CIRCULATION COOLDOWN, after completing the first thbteen steps, 4

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8810250195 001007 Page 1 of 8 i

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NUMBER TITII REV. ISSUE /DATE ES 0.3 NATURAL CIRCULATION COOLDOWN WITII Rev.3 STEAM VOID IN VESSEL (WITil RVLIS)

JUN 3 1988

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED r

7$

CAUTIONt o

IF St ACTUATION OCCURS DURING THIS PROCEDURE, l

E 0, REACTOR TRIP OR SAFETY INJECTION, SHOUlD BE i

PERFORSIED.

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

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NOTEt o

FOIDOUT PAGE SHOULD BE OPEN.

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o RCPs SHOUlD BE RUNIN ORDER OF PRIORITY TO I

PROVIDE NORhfAL PRZR SPRAY.

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IF CONDITIONS CAN BE ESTABUSHED FOR STARTING AN RCP DURING THIS PROCEDURE, STEP 1 SHOULD BE REPEATED.

1 TRY TO START AN RCP:

a. Check RVLIS head indication -
a. Perform the following:

j FULL

1. Increase PRZR level to 75 %

i using charging and letdown.

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2. Establish subcooling greater than 60* F using steam dump.

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b. Establish conditions for starting an RCP:
b. QQIQ Step 2 i
1. Close loop Tc isolation valve l
2. Open loog bgast valve
3. Start oil hft pump l
4. Insure seal water and com znent cooling water supplied to (CP
5. Insure lower bearing temperature l

is less than 170* F

6. Check RCS pressure i

greater than 300 PSIG l

7. Check open Cil TV 240,
7. Open Cil TV 240, Cli TV 241 i

Cil TV 241 and Cil TV 334.

and Cli TV 334 l

(seal water return trip valves)

8. Check open CC TV 1411
8. Open CC TV 1411 (RCP oi) cooler CCW rerum trip valve)
9. Open seal water return MOV Page 2 of 8

.WhGER TTIM REY. ISSUE /DAR j

ES 0.3 NATURAL CIRCULATION COOLDOWN WITH Rev.3 STEAM VOID IN VESSEL (WITH RVLIS) g.

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

c. Start selected RCP
c. IE RCP did NQI stan.

THEN perform the following:

THEN perform the following:

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1. Oxn loop Te isolation valve
1. Open loop Tc isolation valve 1
2. C ose loop bypass valve 2, Close loop bypass valve

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d. Align PRZR spray valves
e. GQIQ NOP 2.3 4, i

ilOT STANDBY TO COLD i

SHUTDOWN, Step 1 NOTEt SATURATED CONDITIONS IN THE PRZR SHOULD BE ESTABUSHED BEFORE TRYING TO DECREASE PRZR LEVEL.

2 ESTABLISH PRZR LEVELTO i

1 ACCOMMODA1E VOID GROW 1H:

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a. Check PRZR level-
a. Control charging and letdown BETWEEN 20 % AND 30 %

as necessary to establish level.

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b. Place PRZR levelcontrolin manual i

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' UMBER TTRE REV. ISSUE /DATE ES.O.3 NATURAL CIRCULATION COOLDOWN WITil Rev.3 i

STEAM VOID IN. VESSEL (WITil RVLIS) g g jg{

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTANED i

r 7!

CAUTION:

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

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CONTINUE RCS COOLDOWN AND l

INITIATE DEPRESSURIZATION:

a. Maintain cooldown rate in RCS cold legs -

l LESS TIIAN 100* F/ HR

b. Maintain RCS subcooling tused on core exit thermocouples -

l GREATER TilAN 52' F l

c. Maintain RCS temperature and pressure -

WITIIIN LIMITS OF TECIINICAL SPECIFICATIONS SECTION 3.4 FIGURE 3.4 9 I

d. Check letdown IN SERVICE
d. Depressurize RCS u'.ing one PORV.

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'DIEN QQIQ Step 4.

c. Depressurize RCS using auxiliary spray i

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NUMBER TTTI.E REY. !SSUEsDATE ES.0.3 NATURAL CIRCULATION COOLDOWN WITH Rev.3 STEAM VOID IN VESSEL (WITH RVLIS) g 3 1988

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Sil!P AC110N/ EXPECTED RESPONSE RESPONSE NOT OBTAINED 4

COSTROL PRZR LEVEL:

a. Maintain PRZRlevel-
a. Control charging and letdown, as l'

GREATER DIAN 20 %

necessary, to increase PRZR level I

to greater than 20 %.

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b. Maintain PRZR Icvel-
b. Perform the following-LESS THAN 90 %

1 1, Tum on PRZR heaters to maintain PRZR pressure stable.

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2. Decrease PRZR level to less than 90 % by one OR both of the following:

o Control charging and letdown as necessary to decrease level, o Continue cooldown to shrink RCS inventory.

5 CHECK RVLIS PLENUM REPRESSURIZE RCS TO MAthTAIN INDICAT10N RVLIS PLENUM INDICATION GREATER THAN 61 %

GREA'IER THAN 61 %,

2 THEN RETURNIQ STEP 3.

6 CHECK IF SOLID PLANT CONDITIONS SHOULD BE ESTABLISHED:

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

I 311EN PRZR temperature is less than 450' F.

U{EN do step 6 b.

b. Increase PRZR level to 100 %

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SutBER TUM REY.15S!!E/DATE l

ES.O.3 NATURAL CIRCULATION COOLDOWN WITil Rev.3 STEAh! VOID IN VESSEL (WITil RVLIS)

Jgg_3 jgg; i

STEP ACDON/EXPEC1ED RESPONSE RESPOf;SE NOT OBTAINID r

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CAUTION:

THE SI SYSTE&f AfUST BE DISABLED BEFORE RCS l

TE&tPERATURE IS LESS THAN 315

  • F.

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7 PERFORht COLD SliUTDOWN ALIGNhtEST:

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

LESS TlIAN 350' F WlIEN core exit thermccouples are less than 350' F.,

T11EN do step 7 b, e and d.

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b. Align core cooling equipment j

IN ACCORDANCE WTril NOP 2.3-4, liOT STANDBY htODE 3 TO j

COLD SIRTIDOWN htODE 5 l

ASD NOP 2.121, CORE COOLING SYSTEh! LINEUP FOR SilUTDOWN AND AT POWER OPERATION

c. Check iflow temperature over
c. MIEN all conditions are satisfied.

pressure protection relief valves 111EN do step 7 d.

should be placed in senice:

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1. Check PRZR level-SOLID
2. Check RCS temperature -

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t.ESS DIAN 325' F

3. Check PRZR teroprature -

LESS TRAN 430 F l

4. Check RCS pressure -

LESS T11AN 325 PSIG I

d. Place low temperature over pressure protection relief valves l

in semce l

IN ACCORDANCE %TTli 3

NOP 2.3 4, llOT STASDBY StODE 3 TO COLD SilU1DOWN htODE 5 Page 6 of 8 l

NUMBER TTT U REV. ISSUESAE ES 0.3 NATURAL CIRCULATION COOLDOWN WITH Rev.3 I

STEAM VOID IN VESSEL (WITH RYLIS) g 3198$

k STEP ACTIONSXPECTED RESPONSE RESPONSE NOT OBTAINED f

8 MAIhTAIN LETDOWN FLOW:

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a. Open letdown orifice isolation valves (LD AOV 202,LD AOV 203,and LD AOV 2(M) as necessary i
b. Adjust serpoint of letdown low pressure regulating valve (LD PCV 113) as i

necessary 9

MAlhTAIN RCP SEAL INJECTION f

FLOW:

s. Throttle seal supply valves (Cli V 354A thmugh D) to maintain 4

i labyrinth differential pressure between 5" and 10" of water pressure 10 CHECK IF RHR SYSTEM CAN BE PLACED IN SERVICE:

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a. Check RCS temperature -
a. RETURN I.Q Step 3.

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LESS T11AN 300* F l

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b. Check RCS pressure -
b. RETURN IQ Step 3.

l LESS TilAN 300 PSIO

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c. Place RHR in senice IN ACCORDANCE WTUI i

1 NOP 2.91.

1 RHR SYSTEM PLACING SYSTEM i

IN SERVICE I1 CONTINUE RCS COOLDOWN TO COLD StilJIDOWN l

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Page 7 of 8 i

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butBER TTRE REY. ISSLT& ATE ES.O.3 NATURAL CIRCULATION COOLDOWN WITil Rev.3 STEAM VOID IN VESSEL (WITil RYLIS)

M 31988 l

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD r

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CAUTION:

DEPRESSURIZING THE RCS BEFORE THE ENTIRE RCS IS LESS TH.W 200* F MA Y RESULT IN ADDITIONAL VOID FORMATION IN THE RCS.

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J 12 CONTLNUE COOLDOWN OF IN/.CTIVE PORTION OF RCS:

s. Cool up;xt head region using CRDM fans
b. Cool SG U tubes by dumping steam from all SGs
c. Check RVLIS head indication.
c. RETURN IO Step 11.

FULL 13 DETERMINE IF RCS l

DEPRESSURIZATION IS PERMITED:

a. Check entin RCS temperature -
a. DO NOT DEPRESSURIZE RCS.

l LESS Ti{AN 200* F REIURS10 Step 11.

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b. GQ IQ NOP 2.3 4, iiOT STANDBY MODE 3 TO COLD SliUTDOWN MODE 5 END l

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