ML20214T514

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Rev 5 to Emergency Operating Procedure E.04, Loss of Heat Transfer
ML20214T514
Person / Time
Site: Rancho Seco
Issue date: 02/18/1987
From:
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20214T470 List:
References
E.04, E.4, NUDOCS 8706100300
Download: ML20214T514 (15)
v • d • e


Text

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EFFECTIVE DATE 02-18-87 E.04 <

O LOSS OF HEAT TRANSFER POST TRIP I WINDOW That

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SATURATION CURVE VARIABLE SUBC00 LED SECONDARY MARGIN _

SYSTEM

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SATURATION

= TEMPERATURE l

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Ret 5 b0 $000K 0 00 2 4

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1 INFORMATION PAGE g l l

1.0 Either MFW or AFW must be capable of feeding an OTSG.

] 2.0 Acoustic monitors for pressurizer code safeties and EMOV should be checked on IDADS for indication.

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, LOSS OF HEAT TRANSFER e

1. 0 E FY IS AVAILABLE  !

! M

! .1 Go to step 7, otherwise continue.

-! 2.0 E RCS PRESSURE INCREASES TO EMOV SETPOINT BEFORE FW IS ESTABLISHED E

, .1 Go to step 5, otherwise continue.

3. 0 ATTEMPT TO ESTABLISH FY i n .1 Manually initiate EFIC channels A & B.

() .1 Place AFW pump R-318 on electric drive;

(RULES 3 & 4)

.2 E AFW la not available M use MFW Pump and/or Condensate Pump.  ;

i 4.0 E FW IS REESTABLISHED i

j

.1 Go to step 7.0, otherwise continue. ,

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Re s E04-3

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INFORMATION PAGE O O

O nov. 5 E.04-4

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l l E.04 l IDSS OF HEAT TRANSFER STATUS ENTRY FROM STEP 2, 4, 9,12, OR 15 CAUTION WITH NO HPI/MU FLOW AVAILABLE DQ. HQI OPEN THE EMOV.

5.0 INITIATE HPI C0011NG (RULE 2)

.1 Manually initiate SFAS channels 1A and 1B.

! .1 Inunediately take manual control and open RCP Seal Return Isolation Valves (SFV-24004 and SFV-24013).

.2 Balance HP1 flow.

! .3 Open EMOV Block Valve (HV-21505).

l .4 Open EMOV (PSV-21511). .

.5 Run one RCP as long as Subcooling Margin is anaintained.

O .6 Turn off Pressuriser heaters. '

.2 E'the EMOV can not be opened '

'!2iEt[ do HQI throttle HPI until SCM existe '

AND incore T/cs decrease.

STATUS GOING TO CP.104, PLANT CONDITIONS ARE:

THERE IS NO HEAT TRANSFER TO EITHER OTSG. NATURAL CIRCULATION DOES NOT EXIST AND CANNOT BE STARTED DUE TO A TOTAL LOSS OF FEEDWATER. THE OTSGs ARE DRY AND THE CORE MUST BE C00!J:D BY HP! COOLING.

6.0 GO TO CP.104 i

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hv. 5 E.04-5 l .

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INFORMATION PAGE g 7.0 EFIC initiate on OTSG Low Level 13.5", controls at 27.5".

8.0 Verify alarms with CFT A and D level and pressure.

Core Flood Tank low level alarms at 12.7 ft.

Core Flood Tank low pressure alarms at 585 psig.

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Rev. 5 E.04-6 -

E.04 LOSS OF HEAT TRANSFER STATUS ENTRY FROM STEP 1 OR 4 FW IS AVAILABLE 7.0 MAINTAIN APPROPRIATE OTSG LEVEL (RULE 4) 8.0 E CORE FLOOD TANKS ARE EMPTYING nun

.1 Go to CP.101, otherwise continue.

STATUS .

O CORE FLOOD TANKS EMPTYING IS AN INDICATION OF A LOCA.

CP.101 PROVIDES INSTRUCTIONS FOR LONG-TERM COOLING FOLLOWING A MAJOR LOCA. PRIMARY TO SECONDARY HEAT TRANSFER IS LOST AND CANNOT BE REGAINED.

4 9.0 E AT ANY TIME PRIOR TO RESTORING HEAT TRANSFER, RCS PRESSURE INCREASES TO 2450 PSIG (EMOV SETPOINT) DE AN RV PTS LIMIT (IF APPLICABLE)

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.1 Go to step 5, otherwise continue.

l0 Rev. 5 E. 04-7 i

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l INFORMATION PAGE a [

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11.0 For incore temp, use SPDS Normal or Post Trip Display with  !

incore button or ICC Display (question mark following value  !

j means it's a questionable ' reading).

l Computer Point G-643 Highest VALID incore temp.

l For secondary Sat Temp. use SPDS Post Trip Display purple vertical line or use OTSG A and B Pressure. l

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4 12.0 A RCP bum? means start the pump, allow starting current to die ,

) off, then al,ow the pump to run 10 seconds before stopping. '

j RCP interlocks.

1 < 30% Rx Power RCP Motor 011 Lift > 1,750 psig .

) RCP Motor Upper Bearing 011 1.evel i 2 inches. '

t RCP Motor Lower Bearing 011 Level 2 inches.

1 Seal Injection Flow > 3 spm. ,

i RCP Pump / Motor CCW Plow > 307 gpm.

I To start Fourth RCP To > 5007.

l Motor 86 Lockout (Motor Protection Relay).

i Normal - Green Light Dim

{ Abnormal - Green Light Bright. ,

i Rev. 5 ,

E.04-8 '

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2 E.04  :

LOSS OF HEAT TRANSFER 1

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10.0 .IE RCPs ARE OPERABLE {

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! .1 Go to step 12, otherwise continue.

,l 11.0 RESTORE PRIMARY TO SECONDARY HEAT l

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1 TRANSFER (RCPs INOPERABLE) - l l .1 2 the RCS is Subcooled j .1 Open the Hot Les HPVs and maintain RCS pressure, j .2 lower OTSG pressure until secondary Tsat is i 90 - 110*F lower than incore temperature.

! .3 Increase OTSG level to "ECC SETPOINT". l l (381" EFIC or 957.)

l

.2 2 the RCS is Saturated  !

Lower OTSG pressure until secondary Tsat is I

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i Q' .2 40 - 607 lower than incore temperature.

Increase OTSG level to "ECC SETPOINT". I l (381" EFIC or 957.) j

.3 2 heat transfer has been established  !

] M Go to step 16. t a  !

! .4 2 heat transfer has HQ.I been established  :

i M Go to step 5. l l

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i 12.0 RESTORE PRIMARY TO SECONDARY HEAT  !

l TRANSFER (RCPs OPERABLE) l l .1 E RCSs IS Subcooled i

M start one RCP. l

.1 Preferred starting sequence is D, B, A, C.

l j .2 E the RCS is saturated 1 .1 Bump one RCP every 15 minutes.

1

.2 Lower 0750 pressure until secondary Tsat is '

90 - 1107 lower than incore temperature.  !

.3 WHEN all operable RCPs have been bumped  ;

M so to step 13.  !

O i Rev. 5 I E.04-9 1

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INFORMATION PAGE g

13.0 Indications of 11 eat Transfer Incore Temp within 107 of Th.

Max expected RCS A T of 50' to 007.

Tc approx equal Tsat OTSG.

Iowering OTSG Pressure causes corresponding decrease in Tc.

O 10.1 C.41 Recovery form SFAS Actuation.

O Rev. 5 E. 04- 10

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j E.04  :

LOSS OF HEAT TRANSFER i

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! 13.0 E HEAT TRANSFER IS ESTABLISHED i THEN  ;

{

j .1 Go to step 16, otherwise continue.

14.0 START AND RUN ONE RCP TO INDUCE '

HEAT TRANSFER i i

! .1 2 at least one hour has passed since Rx trip and any  !

i RCP is capable of being started. even if RCS is saturated  !

! IEEg start and run one RCP Preferably in the loop I which has the 0750 with the highest level  !

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15.0 E HEAT TRANSFER M M BEEN ESTABLISHED j 1 233g .

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O .1 Go to step 5, otherwise continue. '

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! I 1 STATUS i l

l ENTRY FROM STEP 11 I I i i

CAUTION  !

PRIOR TO THROTTLING HPI FLOW BELOW 105 GPM PER PUMP, HPl  !

WIN! FLOW VALVES SFV-23645, SFV-23646 AND MAKEUP TANK OUTLET j VALVE SFV-23508 MUST BE OPEN, t i

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10.0 .WHEN HEAT TRANSFER HAS BEEN ESTABLISHED ,

I IHEN  !

I 1 .1 Secure from HP! cooling if initiated.

! .1 Establish letdown and establish makeup.

j .2 Close EMOV (PSV-21611). f

.3 2 EWOV (PSV-21511) does not close  ;

THEN close EMOV block valve (HV-21505).  !

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! hv. 5 l E.04-11 i l

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t INFORMATION PAGE i O

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17.0 Reactor Vessel Thermal Shock Criteria RCS temperature dropped l l below 5007 and exceeded a 1007/hr cooldown rate  !

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RCS temperature dropped below 5007 and RCPs are off and HPI '

! flow exists through any HPI injection valve as indicated on i the HPI flowmeters.

i The PTS limit takes priority over the fuel pin in compreselon ,

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l 18.0 SPDS Post Trip Display 0750 Tsat Line (purple vertical line) i should be approx equal to Tc.

Il i 075G Tsat can also be read using computer. point 0-161.

19.0 Indications of Subcooling Margin.

System pressure /incore temperature above Variable Subcooling Margin line on SPDS.

j Saturation Temperature for RCS pressure 507 or greater than incores or Th.

i t j > 50' subcooling read on subcoollag margin monitors, j l i i  :

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l Rev. 6 l E.04-12  !

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E.04  !

IDSS OF HEAT TRANSFER 17.0 E Rx VESSEL THERMAL SHOCK LIMITS EXCEEDED m  :

.t Stabilize temperature and pressure below the Interim l Brittle Fracture curve and DEPRESSURIZE if in the  !

restricted region. Pressuriser spray, pressuriser vents or EMOV can be used as required to avoid or exit the t

restricted region.  !

.2 The PTS limit remains in effect for the remainder of the cooldown.

I r l 18.0. CONTROL HEAT TRANSFER RATE I

i .1 Adjust TBV or ADY position to maintain RCS i l Lemperature at present value, i 1

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19.0 E THERE IS ADEQUATE SUBC00 LING MARGIN -

THEN  !

.1 Oo to CP.105, otherwise continue. I

, STATUS {

THE RCS IS SATURATED. A SMALL BREAK 15 INDICATED. COOLDOWN WITH l THE OT50 CAN BE PERFORMED WHILE HPI MAINTAIN 5 RCS INVENTORY. I 20.0 GO TO CP.103 i l

O Nov. 5 E.04-13

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FIGURE 1 REACTOR COOLANT SYSTEM INTERIM FRACTURE LIMIT O NO FORCED FLOW AND THERMAL SIIOCK OPERATING REGION NOTE: Maintaining the reactor hATURATION 3000.. coolant subcooled takes precedence pURVE over the Interim Brittle Fracture ysM Curve (D&W 74-1122501 page 6) NO FORCED PMW \

2000- OPERATING AND INCORE TC's TO MONITOR W/IIPI m 2000- PREFERRED AI. TERNATE

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