ML20205B368
Text
si Steohen i Scace 3 r 87-12 Form Approved by Ste. ion superintencent Effective J 50RC Mtg. No.
STATION PROCEDURE COVER SHEET A.
IDENTIFICATION Number E0P 35 ES-0.4 Rev.
2 Title NATURAL CIRCULATION COOLDOWN WITH STEAM VOID IN VESSEL (WITHOUT RvlMS)
Prepared By H. K. COVIN B.
REVIEW I have reviewed the above procedure and have found it to be $atisfactory.
TITLE SIGNATURE DATE Q2k d M, (c,fl f P DEPARTMENT HEAD y
C.
SPECIFIC UNREVIEWE0 SAFETY QUESTION EVALUATION REQUIRED:
Modifies intent of procedure and changes operation of systems as described in design documents.
YES ( )
NO ( f (If yes, perform written USQ determination and Safety Evaluation, and contact Manager, Safety Analysis Branch to (V']
determine need for Integrated Safety Evaluation.)
ENVIRONMENTAL REVIEW REQUIRED (Adverse environmental impact)
YES ( )
NO (.7 0.
SPECIFIC SAFETY EVALUATION REQUIRED Affects response of safety systems, performance of systems which may have been credited in the safety analysis or non-credited systems which may indirectly affect safety system response.
YES ( )
NO (-}'
(If yes, perform written Safety Evaluation and contact Manager, Safety Analysis Branch to determine need for Integrated Safety Evaluation.)
E.
INTECRATED SAFETY EVALUATION PEQUIRED YES ( )
NO [ d' F.
PROCEDURE REQUIRES
/50RC REVIEW (In addition to revte*, ite w with a YES response must be documented in the g SORC meeting minutes.)
Y E S (-d' NO [ ]
G.
D'50RCAPPROVAL
/50RC Meeting Number 3 - 3 7-/fj H.
APPROVAL AND IMPLEMENTATION eby approved, and effective on the date below:
. d(*/ pre i Ine attached re N-c& M f!
^
(p) itation/ dervice/ Unit superintendent Effective Date w-v SF 301 8910060229 891007 Page 1 of 1 PDR ADOCK 05000213 P
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E0P 35 ES-0.4 Page 1 L
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Rev. 2 t
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I NATURAL CIRCULATION COOLDOWN WITH STEA?! VOID f
IN VESSEL (WITHOUT RVIJ1S)
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NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.4 Page 2 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2
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PURPOSE This procedure provides actions to continue plant cooldown an'd depressurization to cold shutdown, with no accident in progress, under, conditions that allow for the potential fo.-mation of a void in the upper head region without a vessel level system available to monitor void growth.
B.
ENTRY CONDITIONS This procedure was written for Modes 1, 2 and 3 when near no load conditions. 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 frotu E0P 35 ES-0.2, NATURAL CIRCULATION C00LDOWN, after completing the first eleven steps.
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NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.4 Page 3 STEAM VOID IN VESSEL (WITHOUT RVIJ1S)
Rev. 2
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v STEP ACTION / EXPECTED RESPONSE RESPONSE NOT QBTAINED CAUTION 1.
If SI actuation occurs during this procedure, E0P 35 E-0, REACTOR TRIP OR SAFETY INJECTION, should be performed.
2.
The first eleven steps of E0P 35 ES-0.2, NATURAL CIRCULATION C00LDOWN should be performed before continuing with this procedure.
NOTE 1.
Foldout page should be open.
2.
RCPs should be run in order of priority to provide normal PZR spray, (2, 1, then 3 or 4) 3.
If conditions can be established for starting an RCP during this procedure, Step 1 should be repeated.
(,)
4.
I f L' imputer is not available to measure core exit
- TCs, u..
1 ally measure TCs.
5.
If auxiliary spray is required during procedure performance, maintain spray flow and throttle charging flow as necessary for proper plant control.
1 Try To Restart An RCP a.
Establish conditions for a
Go to Step 2.
starting an RCP per OP-3301D, RCP OPERATION i
i b.
Check PZR level > 90%
b.
Control charging and letdown as necessary to increase level to
> 90%.
c.
RCS subcooling based on c.
Establish subcooling coce exit TCs > 70*F based on core exit TCs
> 70 F using atmospheric dumps.
d.
Start one RCP d.
Go to Step 2.
e.
Go to OP-3208, PLANT
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C00LDOWN oPW41 3 84
NATURAL CIRCULATION COOLDOWN WITH E0P 35 ES-0.4 Page 4 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2
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1 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE Saturated conditions in the PZR shct.1d be estaolished before trying to decrease PZR level.
2 Establish PZR Level To Accommodate Void Growth a.
Place PZR level controls in manual b.
Check PZR level - BETWEEN b.
Control c'aarging and 20% AND 25%
letdown as necessary.
3 Decrease RCS Hot Leg Temperatures To approximately 500*F a.
Maintain cooldown rate in RCS cold legs < 50 F/HR b.
Miintain RCS pressure -
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a ', approximately 1950
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psia c.
Maintain RCS temperature and pressure to the right of the curve on Tech Spec Figure 3.4-3 RCS COOLDOWN LIMITATIONS d.
Maintain stable PZR level using charging e.
Check RCS hot leg e.
Return to Step 3a.
temperatures < 500'F f.
Stop RCS cooldown
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.N A A U MA L L1hLULA11UN LUULUUwh Willt LUP 35 tb-U.4 Page 3 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2 I
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STEP ACTICIN/ EXPECTED RESPONSE RESPONSE NOT OBTAINED
_____4 Depressurize RCS To approximately 1600 psia a.
Check letdown - IN a.
Use one PZR PORV.
SERVICE Go to Step 4c.
b.
Use auxiliary spray c.
Check RCS pressure c.
Return to Step 4a.
< 1600 psia d.
Stop RCS depressurization 5
Decrease RCS Hot Leg Temperatures To approximately 450*F a.
Maintain cooldown rate in RCS cold legs <
100'F/HR b.
Maintain RCS pressure (O)
at approximately 1600 psia c.
Maintain RCS temperature and pressure to the right of the curve on Tech Spec Figure 3.4-3 RCS C00LDOWN LIMITATIONS d.
Maintain stable PZR level using charging e.
Check RCS hot leg e.
Return to Step Sa.
temperatures < 450'E f.
Stop RCS cooldown 6
Equalize Charging And Letdown Flows a.
Place charging and letdown controls in manual b.
Control charging and seal injection flows to equal letdown and seal leakoff flows
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7 Maintain Required RCP Seal
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Injection Flow between 8 to 13 gpm OPW41 3 44
NATURAL CIRCULATION COOLDOWN WITH E0P 35 ES-0.4 Page 6 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2 I
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J l ACTION / EXPECTED RESPONSE RESPONSE NOT OSTAINED STEP NOTE The upper head region may void during depressurization.
This will result in a rapidly increasing PZR level.
8 Depressurize RCS a.
Check letdown - IN a.
Use one PZR PORV.
SERVICE Go to Step 8c.
b.
Use auxiliary spray c.
Depressurize PZR to approximately 1000 psia d.
CLOSE the SI Accumulator d.
IF any accumulators Isolation valves and OPEN cannot be isolated the motor supply breakers.
THEN vent off pressure (32-2R-R5F, 32-2W-R3J, from appropriate 32-2R-F4M, 32-2W-F4M) unisolated accumulators e.
Depressurize RCS until
/~'i either of the following
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conditions satisfied
- 1) RCS pressure
< 815 psia
-0R-
- 2) PZR level > 90%
f.
Stop RCS depressurization NOTE In order to continue overall system depressurization it may be necessary to cycle PZR level (cycle pressure) to enhance upper head cooling or establish vessel head letdown via excess letdown per OP-3304A, CHARGING AND LETDOWN.
9 Check PZR level < 90%
Increase RCS pressure by 100 psi using PZR heaters.
Return to Step 8e.
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NAIUKAL CIRCULATION COOLDOWN WITH EOP 35 ES-0.4 Page 7 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAlHED 10 Decrease RCS Hot Leg Temperatures To approximately 400 F a.
Maintain cooldown rste in RCS cold legs
< 100*F/IIR b.
Maintain RCS pressure -
STABLE c.
Maintain RCS temperature and pressure to the right of the curve on Tech Spec Figure 3.4-3 RCS C00LDOWN LIMITATIONS d.
Maintain stable PZR level using charging e.
Check RCS hot leg e.
Return to Step 10a.
temperatures < 400*F p
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Stop RCS cooldown 11 Equalize Charging And Letdown Flows a.
Place charging and letdown controls in manual b.
Control charging and seal injection flows to equal letdown and seal leakoff flows c PMM-1 3 64
NATURAL CIRCULATION COOLDOWN WITH E0P 35 ES-0.4 Page 8 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2
,/ 3 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Depressurize RCS a.
Check letdown - IN a.
Use one PZR PORV.
SERVICE Go to Step 12c.
b.
Use auxiliary spray c.
Depressurize RCS until either of the following conditions satisfied
- 1) RCS pressure < 615 psia
-OR-
- 2) PZR level > 90%
d.
Stop RCS depressurization 13 Check PZR level < 90%
Increase RCS pressure by 100 PSI using PZR
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heaters. Return to x, /
Step 12.
14 Decrease RCS Ilot Leg Temperatures To approximately 350 F a.
Maintain cooldown rate in RCS cold legs
< 100'F/HR b.
Maintain RCS pressure -
STABLE c.
Maintain att
.?nerature and pressure to tt
-ight of the curve on Tech b.-
i Figure 3.4-3 RCS COOLDOWN LIMITATIONS d.
Maintain stable PZR level using charging l
Check RCS hot leg e.
Return to Step 14a.
e.
temperature < 350ay
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Stop RCS cooldown
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hAIUHAL ClHCULATION COOLDOWN W11H EOF 35 ES-0.4 Page 9 STEAM VOID IN VESSEL (WITHOUT RVLMS)
Rev. 2
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l x-STEP ACTION / EXPECTED Rf SPONSE RESPONSE NOT OBTAINED 15 Equalize Charging And Letdown Flows a.
Place charging and letdown controls in manual b.
Control charging and seal injection flows to equal letdown and seal leakoff flows 16 Depressurize RCS a.
Check letdown - IN a.
Use one PZR PORV.
SERVICE Go to Step 16c b.
Use auxiliary spray c.
Depressurize RCS until either of the following conditions satisfied l
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- 1) RCS pressure
< 390 psia
-OR-
- 2) PZR level > 90%
d.
Stop RCS depressurization 17 Check PZR level < 90%
Increase RCS pressure by 100 PSI using PZR heaters.
Return to Step 16.
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.NAILKAL CIRCULATION COOLDOWN WIIH EOP 35 ES-0.4 Page 10 STEAM VOID IN VESSEL (WITHOUT RVLMS) xev. 2
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l STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l
18 Check If RHR System Can Be Placed In Service a.
RCS temperature a.
Return to Step 14.
< 350 F b.
RCS pressure < 390 psia b.
Return to Step 16.
c.
Place RHR System in servi'ce as follows
- 1) OP-3310A, Residual HEAT REMOVAL SYSTEM
- 2) OP-3208, PLANT C00LDOWN d.
Disable all but one charging pump and all but one HPSI pump prior to cooling down to
< 350*F e.
Arm Cold Overpressure Protection System
(,)
19 Continue RCS Cooldown To Cold Shutdown CAUTION Depressurizing the RCS before the entire RCS is < 200'F may result in additional void formation in the RCS.
20 Continue Cooldown Of Inactive Portion of RCS a.
Cool upper head region a.
IF the head cannot be using CRDM fans cooled by CRD1 fans THEN use vessel head vent excess letdown b.
Cool SG U-tubes by dumping steam from all SGs
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NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.4 Page 11 STEA:. VOID IN VESSEL (WITHOUT RVLMS)
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 21 Determine If RCS Depressurization Is Permitted a.
Entire RCS < 200*F
.x.
DO NOT DEPRESSURIZE RCS. Return to Step 19.
b.
Go to OP-3208, PLANT C00LDOWN
-FINAL-O v
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1 1,
- r E0P 35 ES-0.4 Rev. 2 i i FOLDOUT FOR E0P 35 E-0 SERIES PROCEDURES 1.
RCP TRIP CRITERIA Trip all RCPs E BOTH conditions listed below occur a.
Charging pumps OR SI pumps - AT LEAST ONE RUNNING
-AND-b.
RCS Pressure - < 1435 PSIA (1700 PSIA FOR ADVERSE CONTAlbifENT) 2.
SI ACTUATION CRITERIA Actuate SI AND go to E0P 35 E-0, REACTOR TRIP OR SAFETY INJECTION, Step 1, IF EITHER condition listed below occurs a.
RCS subcooling based on core. exit TCs - < 30*F (90'F FOR ADVERSE CONTAINMENT)
-0R-b.
FZR level - CAN'NOT BE MAINTAINED > 7% (50% FOR ADVERSE CONTAINMENT)
O 3.
PID PATH
SUMMARY
a.
SUBCRITICALITY - Nuclear power > 5%
b.
CORE COOLING - Core exit TCs > 1200'F c.
HEAT SINK - Narrow range level in all SGs < 4% (34% FOR ADVERSE CONTAINMENT) @ total feedwater flow < 525 gpm d.
INTEGRITY - Cold leg temperature decrease > 100 F in last 60 minutes @ RCS cold leg temperature < 252*F CONTAINMENT - Containment pressure > 60 PSIA l
e.
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4.
AFV SUPPLY SWITCHOVER CRITERION Establish the CST AFV water supply E DWST level decreases to
< 80,000 gal.
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