ML20205B403

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Rev 2 to Emergency Operating Procedure EOP 35 ES-1.2, Post-LOCA Cooldown & Depressurization
ML20205B403
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 06/15/1988
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
EOP-35-ES-1.2, NUDOCS 8810260238
Download: ML20205B403 (17)
v • d • e


Text

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'4 STATION PROCEDURE COVER SHEET A.

IDENTIFICATION f

Number E0P 35 ES-1.2 Rev.

2 Title POST LOCA COOLDOWN AND DEPRESSURIZATION l

Prepared By JOHN L. BUCKINGHAM/H.

K. COVIN B.

REVIEW I have reviewed the above procedure and have found it to be satisfactory.

TITLE

$1GNATURE DATE DEPARTMENT HEAD N

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'S

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l C.

SPECIFIC UNREVIEWED SAFETY QUESTION EVALUATION REQUIREn.

Modifies intent of procedure and changes operation of systems as described in design documents.

YES ( )

NO(g (If yes, perform written USQ determination and Safetv Evaluation, and contact Manager, Safety Analysis Br,"1ch to 8

determine need for Integrated Safety Evaluation.)

ENVIRONMENTAL REVIEW REQUIRED O

( Adverse e'ivi ronmental impact)

YES ( ]

NO ([

D.

SPE'CIFIC !AFETY EVALUATION REQUIRED l

Affects response of safety systems, performance i

~

of systems which may have been credited in the safety analysis or non-credited syste.is which y

l may. indirectly affect safety system response.

YE3 ( )

NO P]

(If yes, perform written Safety Evaluation and contact Manager, Safety Analysis Branch to determine 1

need for Integrated Safety Evaluation.)

i E.

INTEGRATFD SAFETY EVALVATION REQUIRED YES ( )

NO (v PROCEDUREREQUIRES_[ChC/SORCREVIEW F.

it ja with a YES response

/

l

~

j (In addition to review, e

J must be docunented in theg0Rf/50RC meeting minutes. )

YES (V)

NO ( )

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SORC APPROVAL SORC Meeting Number 18 7-2d 7 v

H.

APPROVAL AND IMPLEMENTATION l

I The attached rocedure is hereby approved, and effec'.ive on the date below:

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~ 5tation/Se hire / Unit Superintendent Effective Date I

SF301/9/s/SES/67-12/lof1 L

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PDR ADOCK O PDR P

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E0P 35 ES-1.2 Page 1 l

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Rev. 2 i

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POST LOCA COOLDOWN AND DEPRESSURIZATION j

Page No.

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Attachment A 2

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POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 2 Rev. 2 rh (t-)

A.

PURPOSE This procedure provides actions to cool down and depressurize the RCS to cold shutdown conditions following a loss of reactor coolant inventory.

B.

ENTRY CONDITIONS This procedure was written for Modes 1, 2, and 3 assuming RHR is not in service. Using this procedure when not in these modes requires a step by step evaluation to determine if the required action is still applicable to current plant conditions.

This procedure is entered from 1)

E0P 35 E-1, LOSS OF REACTOR OR SECONDARY COOLANT, Step 13, when RCS pressure is greater than the shutoff head pressure of the RHR pumps.

2 )'

E0P 35 ES-1.1, SI TERMINATION, Step 8, when PZR level cannot be maintained using normal charging.

3)

E0P 35 ES-1.1, SI TERMINATION, Step 9, when RCS pressure is less than shutof f head pressure of the SI pumps.

OPSMS-2 3 84 1

e POST LOCA COOLDOWN AND DEPRESSUBIZATION E0P 35 ES-1.2 Page 3 Rev. 2

(

)

\\J STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OSTAINED CAUTION 1

If RWST level decreases to < 520,000 gal., the SI System should be aligned for cold leg recleculation using E0P 35 ES-1.3, TRANSFER TO COLD LEG RECIRCULATION.

2 If offsite power is lost after SI reset, manual action may be required to restart safeguards eauipment.

NOTE Foldout page should be open.

1 RESET SI 2

RESET Containment Isolation Phase A and Phase B

~-

3 Instrument Air to Containment -

Establish instrument air ESTABLIS11ED to containment 1.

One instrument air compressor - RUNNING 2.

OPEN instrument air containment isolation valves a.

Try to restore offsite 4

Verify All AC Busses ENERGIZED BY OFFSITE power.

POWER b.

IF necessary, TilEN manually load the following equipment on the ac emergency busses 1.

Instrument Air Compressor

2. PZR heaters
3. Fuel building filter system 4.

If CDA not prescat evaluate need for Fuel Pool cooling pump s.

OPMes-1 3 44

POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 4 i

Rev. 2 I

i Lj STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBT AINED c.

Energize MCC 32-3T and verify it is supplying Inverter 6 CAUTION RCS pressure should be monitored.

If RCS pressure decreases to < 300 psia (450 psia FOR ADVERSE CONTAINMENT), the Rl!R pumps must be manually restarted to supply water to the RCS.

5 Check If Ri{R Pwnpu Should Be Stopped a.

Check RCS pressure a.

Go to Step 6.

1) Pressure > 300 psia l

(450 psia FOR ADVERSE CONTAINMENT)

()

2) Pressure - STABLE A/

OR INCREAS!WG b.

STOP RIIR pumps and l

place in AUTO CAUTION AFW pump suction should be shifted to the CST if DVST level decreases to < 80,000 gal, 6

Check Intact SG Levels a,

Narrow range level a.

Maintain total feed flow

> 4% (34% FOR

> 525 gpm untti narrow ADVERSE CONTAINMENT) range level'> 4% (34%

FOR ADVERSE CONTAINMENT) in at least or.e SG.

O 08%-(4-1 3-44

POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 5 Rev. 2

%s STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED b.

Control feed flow to b.

IF narrow range level maintain narrow range in any SG continues to level between 4%

increase in an (34% FOR ADVERSE uncontrolled manner, CONTAINMENT) and 50%

THEN go to E0P 35 E 3, STEAM GENERATOR TUBE RUPTURE, Step 1.

NOTE 1 Shutdown margin must be maintained during RCS cooldown.

2 Low steamline pressure SI signal should be blocked when PZR pressure iecreases to < 2000 psia.

l 7

Initiate RCS Cooldown To Cold Shutdown a.

Maintain cooldown rate in RCS cold legs l

< 100*F/HR b.

Use RRR System if in service c.

Dump steam to condenser c.

Dump steam to atmosphere from intact SG(s) using intact SG(s) 8 Check RCS Subcooling Based Go to Step 21.

On Core Exit TCs > 30*F l

(90'F FOR ADVERSE CONTAINMENT) 9 Check If ECCS Is In Service Go to Step 17.

a.

SI pumps - ANY RUNNING SR l

o.

Charging Cold Leg Injection Valves -

EITHER OPEN 9.3 c.

RHR pumps - ANY RUNNING IN S1 MODE

__ _ __10 Place All P?.R Heater Switches In OFF Posttion 1

(

/

l oews1 3-84 f

)

POSI LOCA COOLDOWN AND DEPRESSURIZATION EUP 35 ES-1.2 Page 6 Rev. 2

,a (v)

STEP ACTION / EXPECTED RESPONSE RESPON$t NOT OSTAINED l

CAUTION Voiding may occur in the RCS during RCS depressurization.

This will result is a rapidly increasing PZR level.

11 Depressurize RCS To Refill PZR a.

Use normal PZR spray a.

l' ' one PZR PORV.

IT r.o PORV available, THEN use auxiliary spray.

b.

PZR level > 17%

b.

Continue with Step 12.

(50% FOR ADVERSE WHEN level > 17% (50%

CONTAIhtENT)

FOR ADVERSE CONTAlhMENT),

THEN do Step 11c.

c.

Stop RCS depressurization

h (V

CAUTION If RCP seal cooling had previously been lost, the af fected RCP(s) should not be started prior to a status evaluation.

NOTE RCPs should be run in order of priority (RCP 2, 1 THEN 3 or 4) to provide normal PZR spray.

12 Check If an RCP Should Be Started a.

All RCPs - STOPPED a.

STOP all but one RCP, Go to Step 13.

b.

RCS subcooling based b.

Go to Step 21.

on core exit TCs

> 30*F (90*F FOR ADVERSE CONTAINMENT) v orwss-s s s4

POSI LOCA COOLDOWN AND DEPRESSURIZAT10N E0P 35 ES-1.2 Page 7 Rev. 2 7g\\v/

STEP ACTION / EXPECTED RESPONSE RESPONSE N07 0BTAINED c.

PZR level c.

Return to Step 11.

> 17% (50% FOR l

ADVERSE CONTAINMENT)

I d.

Establish conditions for starting an RCP per OP 3301D, RCP OPERATION e.

START preferred RCP NOTE

1. After stopping any ECCS pump, RCS pressure should be allowed to stabilize or increase before stopping another ECCS pump.
2. The Charging and SI pumps should be stopped on alternate ECCS trains when possible.

13 Check If One Charging Pump Should Be Stopped a.

Two charging pumps -

a.

Go to Step I?,.

RUNNING b.

Determine required RCS subcooling from table S1 RCS SUBC00 LING (*F)

PUMP STATUS ANY RCP RUNNING NO RCP RUNNING NORMAL ADVERSE NORMAL ADVERSE NONE RUNNING 89*F 191*F 103'T 195_'F,

ONE RUNNING 52*F 155'F 59'F 157'F TW RUNNING 49*F 151*F 55'F 153*F s

CPK$8-I ) 44 i

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POST LOCA COOLDOWN AND DEPRESSURIZATION EOP 35 ES-1.2 Page 8 Rev. 2 m

%.J STEP ACTION /IXPECTED RESPONSE RESPONSE NOT OBTAINED c.

RCS subcooling based c.

E RCS hot leg temperatures on core exit TCs

> 370*F (345'F FOR ADVERSE

> REQUIRED SUBC00 LING CONTAINMENT)

THEN, go to Step 22.

E RCS hot leg temperatures

< 370*F (345'T FOR ADVERSE CONTAINMENT)

THEN START one RHR pump if none running. E at least one RHR pump can Ny be operated T_ HEN, go to Step 22.

d.

PZR level > 17% (50%

d.

DO NOT STOP CHARGING FOR ADVERSE CONTAINMENT)

PUMP.

Return to Step 11.

e.

Stop one charging pump 14 Check If One SI Pump Should Be Stopped a.

Any SI pump -

a.

Go to Step 15.

RUNNING b.

Determine required RCS subcooling from table SI RCS SUBCOOLING (*F)

PUMP ONE CHARGING PUMP RUNNING NO CIL8JtGING PUMP RUNNING STATUS ANY RCP RUNI!NG NO RCP RUNNING ANY RCP RUNNING NO RCP RUNNING ONE NORMAL ADVERSE NORMAL ADVERSE NORMAL ADVERSE NORMAL ADVERSE RUNNING 142 239 154 239 T%'O lv S ING 42 13's 47 136 55 158 64 160 1

O m,..

POST LOCA COOLDOWN AND DEPRESSURIZATION EOP 35 ES-1.2 Page 9 Rev. 2

,.7 i

U STEP ACTION /tXPECTED MESPONSE RESPONSE NOT OgTAINED c.

RCS subcooling based c.

IF RCS hot leg temperatures on core exit TCs

> 370*F (345'T FOR ADVERSE

> REQUIRED SUBCOOLING CONTAINMENT) THEN go to Step 22.

IF RCS hot les temperatures < 370*F (345'T FOR ADVERSE CONTAINMENT) THEN START one RHR pump if none running.

IF at least one RHR pump can Ny BE operated. THEN, go to Step 22.

d.

PZR level > 17%

d.

DO NOT STOP SI PUMP.

(50% FOR ADVERSE Return to Step 11.

CONTAINMENT) e.

STOP one additional SI pump f.

Go to Step 14a

['

15 Check If Normal Charging

\\

Should Be Established a.

Check the following a.

Go to Step 21.

1) SI pumps - STOPPED
2) Charging prmps ALL BUT ONE STOPPED b.

RCS subcooling based b.

IF RCS hot leg temperatures cn core exit TCs

> 370*F (345'T FOR ADVERSE

> 30*F (94*F FOR ADVERSE CONTAINMENT)

CONTAINMENT) IF ANY RCP THEN go to Step 22.

RUNNING IF RCS hot leg temperatures

< 370*F (345'T FOR ADVERSE CONTA!NMLNT) THEN S1 ART one RHR pump if none running IF at least one RER pump can NOT be operated.

THEN go to Step 22.

O L.

CPMwo 1 3 41

POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 10 Rev. 2 (ss) 4TEP ACTIC N/tXPECTED AkSPQhtt RESPON$t NOT ORTAINED c.

PZR level > 17%

c.

Return to Step 11.

(50% FOR ADVERSE CONTAINt1ENT) 16 Isolate Charging Pamp Injection Flow Path

a. IF two charging pump cold leg injection valves are open, THEN CLOSE one valve
b. Establish 60 gpm normal charging path
c. CLOSE the Charging pump miniflow isolations to the RWST (3CHS*MV8SilA/B)
d. CLOSE a Charging Pump Cold Leg Injection valve.

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e. OPEN the Charging Pump

'N -

Recire Isolations m

17 Check IF Charging Flow should be controlled to Maintain PZR Level

a. Check RHR pumps - NONE
a. Go to Step 21.

RUNNING IN SI MODE.

b. Control Charging Flow to Maintain PZR Level.

OU l

CPK681 3 64

POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 11 Rev. 2

,_s i

'\\~J STEP ACTION < EXPECTED RESPONSE RESPONSE NOT OPTAINED CAUTION If seal cooling had previously bee. lost, the affected RCP(s) should not be started prior to a status evaluation.

NOTE RCPs should be run in order of priority (2, 1 THEN 3 or 4) to provide normal PZR spray, 18 Check RCP Status a.

RCPs - AT LEAST a.

Try to start one RCP, OVE RUNNING

1) Establish conditions for 6 tarting an RCP per OP 3301D, RCP OPERATION f-
2) START one RCP.

IF an

(g)

RCP can NOT be started, THEN refer to ATTACRMENT 4

A to verify natural circulation.

IF natural cf.culation NOT verified, THEN increase dumping steam.

b.

STOP all but one RCP km UP*x44-1 3 44

POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 12 Rev. 2

<- s

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STEP ACTH3N/ EXPECTED RESPONSE ret *0NSE NOT QBTAINED CAUTION Voiding may occur in the RCS during RCS depressurization.

This will result in a rapidly increasina PZR level.

19 Depressurize RCS To Minimize RCS Subcooling a,

Use normal PZR spray a.

Use one PZR PORV.

IF no PORV availabit. TilEN use auxiliary spray.

b.

Control PZR heaters as necessary c.

Depressurize RCS until EITHER of the following conditions satisfied

_s

1) PZR level > 73% (50%

\\

FOR ADVERSE CONTAIN'iENT) i O_R

2) RCS subcooling based on core exit TCs < 40*F l

(100*F FOR ADVERSE CONTAINMENT)

_ _2 0 Verify Adeqvate Shutdown Marg.n a.

Sample RCS b.

Shutdown margin -

b.

Borate as necessary.

ADEQUATE 21 Verity ECCS Flow Not Required a.

RCS subcooling based a.

Manually operate ECCS on ccre exit TCs > 30*F pumps as necessar,.

Go (90*F FOR ADrc.RSE to Step 22.

t CONTAINMENT) i l

b.

PZR level > 7% (50%

b.

Manually operate ECCS FOR ADVERSE CONTAINMENT) pumps as necessary, f'T Ro} urn to Step 11.

x_ /

ONOM-1 3H

I POST LOCA C00LDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 13 Rev. 2

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s, STEP ACTION. EXPECTED RESPONSE RESPONSE NOT OBTAtNED 22 Check If SI Accumulatorm Should Be Isolated a.

RCS sabcooling based a.

IF at least two RCS hot on core exit TCs > 80*F leg temperatures (140'F FOR ADVERSE

< 375*F THEN go to CONTAINMENT)

Step 22c.

IF NOT, THEN do Step 23.

b.

PZR Level > 7% (50% FOR b.

Return to Step 11.

ADVERSE CONTAINMENT).

c.

Restore power to isolation valves (32-2R-R5F, 32-2W-R33 32-2R-F4M, 32-2W-F4M) d.

CLOSE all SI accumulator d.

Vent any unisolated isolatica valves accumulators.

e Remove power from isolation valves.

('

23 Check If Diesel Generators Should Be Stopped a.

Verify ac emergency a.

fry to restore offsite busses - ENERGIZED BY power to ac emergency 0FFSITE PO' AIR busses.

b.

RESET any LOP, SIS, or CDA signal at MB2.

c.

Stop any unloaded diesel generator and place in standby d.

RESET Station LOP at both Sequencer panels.

e.

RESET, then. urn ON cach Diesel Sequencer Automatic Tester toggle switch.

f.

CLOSE Feeder Breakers to Emergency Generator Distribution Panels 3EGS*PNLIA at 32-IT-3H and 3EGS*PNLIB at 32-lU-3H.

C %~e s t 3 64

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POST LOCA COOLDOWN AND DEPRESSURIZATION E0P 35 ES-1.2 Page 14 Rev. 2 r'N

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STEP ACTION 4XPECTED RESPONSE RESPONSE NOT OBTAINED i

24 Check RCP cooling - NORMAL Refer,to OP 3330A, a.

RCP RPCCW flow a.

REACTOR PLANT COMPONENT COOLING WATER b.

Maintain RCP seal b.

Refer to OP 3304A, injection flow per CRARGING AND LETDOWN between 8 to 13 gpm 25 Check if RCP seal return flow should be established a.

RPCCW flow available a.

Go to Step 26.

to seal water heat exchanger b.

Establish flow, OPEN RCP seal Containment inner and outer Isolation Valves 26 Check If Source Range Detectors Should Be Energized (s_/)

a.

Check intermediate range a.

Continue with Step 27.

flux < 10E-10 amps VHEN flux < 10E-10 amps THEN do Steps 26b and c.

b.

Verify source range b.

Manually energize source detectors - ENERGlZED range detectors or use post accident nuclear instrument monitors.

c.

Transfer nuclear recorders to source range scale 27 Shut Down Unnecessary Plant Equipment a.

All but one Condensate Pump b.

All but one Cire Water Pump per condenser c.

Both moisture Separator Drain Pumps d.

4th point heater drain pumps

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OPx44-1 3 84

7 POST LOCA EJOLD0kN AND DEPRESSL'RIZATION E0P 35 ES-1.2 Page 15 Rev. 2 A\\u,)

STEP ACTION /tXPECTED RESPONSE RESPONSE NOT GSTAINED 28 Check If RCPs Must Be Stopped a.

Check the following a.

Go to Step 29.

1) Number 1 seal differential pressure < 210 Ps!d.

-OR-

2) Number 1 return flow <.2 spm.

l b.

STOP affected RCP(s) 29 Continue the Cooldown 30 Check If RHR System Can Be Placed In Service a.

Che k the following

a. Go to Step 31.
1) RCS temperatures < 350*F n

k-

2) RCS pressure < 3y0 psia, s

b.

Consult plait engineering staff to determine if RRF System should be placad in service 31 Check RCS Temperatures Return to Step 6.

AND RVLMS Head TC's 2~~2 0 0

  • F.

l 32 Evaluate Long Term Plant Status a.

Maintain cold shutdown conditions b.

Consult Director of Station. Emergency Org anization (DSEO)

-FINAL-O C PKf 4. % 3 44

POST LOCA COOLDOW AND DEPRESSURIZATION E0P 35 ES-1.2 Page 1 of 1 Rev. 2 O

V A,TTACleIENT A The following conditions support or indicite natural circulation flow.

1.

hCS subcooling based on core exit TCs > 30'T (90*F FOR ADVERSE l

CONTAINMENT) 2.

S0 pressures - STABLE OR DECREASING 3.

RCS hot leg temperatures - STABLE OR DECREASING 4.

Core exit TCs - STABLE OR DECREASING 5.

RCS cold leg temperatures - AT. SATURATION TEMPERATURE FOR SG

,PRESSLHE O

O

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