ML20214T520

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Rev 7 to Emergency Operating Procedure E.05, Excessive Heat Transfer
ML20214T520
Person / Time
Site: Rancho Seco
Issue date: 02/18/1987
From:
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20214T470 List:
References
E.05, E.5, NUDOCS 8706100304
Download: ML20214T520 (34)
v • d • e


Text

_. . . . . .

EFFECTIVE DATE 02-18-87

"*

  • 7 s.05 O excessivs asAr rainsesa I

POST TRIP WINDOW Tynt O SArURiriON CURVE VARIABLE SUBC00 LED / SECONDARY MARGIN _

SYSTEM SATURATION

= TEMPERATURE O

Re v. 7 E05-1 0706100:104 ojof,op l',D4 ADOCK onooo3:a von

O O .

INFORMATION PAGE O

e w

e Ro y, 7 E. 05-2

O O -

E.05 EXCESSIVE HEAT TRANSFER

1. 0 JE AT ANY TIME DURING EXCESSIVE HEAT TRANSFER

.1 Pressurizer level decreases to < 10 inches DE EITHER OTSG level increases to 95%

QB

, RCS Tcold decreases to 525*F.

r

.THIE Trip MFW and AFW pumps which are ETILL supplying flow to the OTSGs.

CAUTION THROITLING HPI FOR APPLICABLE PTS UMITS TAKES PRECEDENCE OVER MAINTAINING PRESSURIZER 12 VEL O

CAUTION ANYTIME THE RCS Tc DECREASES TO' .s; 500*F, 3 RCP OPERATION IS MANDATORY. .

2.0 MAINTAIN PZR LEVEL > 100 INCHES.

.1 Isolate letdown (SFV-22009).

.2 E Imvel cannot be maintained > 100 inches IHEM

.1 Start HPI pump lined up from BWST. (RULE 2)

.2 Open Imop A HPI Injection Valve (SFV-23811

.3 E Level still cannot be maintained > 100" ).

THEN initiate SFAS Channels 1A & 18.

r i

O Rev. 7 E.05-3

7 O O -

INFORMATION PAGE 3.0 Indication of an overcooling OTSG are:

.1 Excessive feedwater flow main or AFY.

.2 Higher level in one OTSG.

.3 Lower pressure in one OTSG.

i 4.0 If any isolation, isolates the feedwater or steam leak closing the remaining valves is not necessary.

4.1 Valves on Control Panel H2YS with the bezels in DARE BROWN indicates the "A" or "B" OTSG isolation valves to be closed for excessive heat transfer.

I O

Rev. 7 E.05- 4 I

0 0  !

l l

E.05 EXCESSIVE HEAT TRANSFER

3. 0 IE IT IS APPARENT THAT ONE OTSG IS CAUSING THE OVERC00 LING

.1 Isolate the overcooling OTSG per step 4.

.2 2 it is HQT apparent which OTSG is causing the overcooling THEN isolate BOTH OTSGs, Go to Step 4.

1 l CAUTION i

CLOSE MAIN STEAM TO AUX STEAM (HV-20565 AND HV-20560) LAST AND l REOPEN THEM AS SOON AS POSSIBLE IF THE TRANSIENT PERMITS, TO MAINTAIN AIR EJECTORS, SEALING STEAM, AND MAIN CONDENSER VACUUM. j I

4.0 ISOLATE THE OVERC00 LING OTSG'S USING O '

CONTROL ROOM CONTROLS

.1 T'erminate feedwater and isolate steam to one or both OTSG by closing the following valves and verfly closed.

A OTSG VALVE NAME B OTSG FV-20575 SU FW Control FV-20578 FV-20525 MFW Control FV-20526 FV-20529 MFW Block FV-20530 HV-20515 MFW ISOL HV-20516 TBVs Turbine Bypass TBVs ADVs Atmos Dumps ADVs HV-20569 MSS to AFW Pump HV-20596 HV-20597 MSS to Reheaters HV-20598 HV-32243 MSS to Pegging N/A HV-20609 OTSG Blowdown HV-20610 HV-20581 AFW Block HV-20582 HV-20577 AFW Block HV-20578 HV-20565 MSS to Aux Steam HV-20560

.2 E Turbine Bypass or Atmos Dump valves fall to close THEN

.1 Close Turbine B ass Isolation valve "A" side ,

(HV-21521) or " side (HV-20522) l

.2 "A" side (HV-20517) i O Close "a sideAtmos(av-2c5ta Dump.) Isolation valve Rev. 7 E.05-5 i 1

^

Q .Q ,

DWORMATION PAGE O

5.0 Overcooling is occurring from both OTSGs.

8. 0 Pressure and level are still decreasing on one OTSG.

O 7.1 AFW control with out RCP 317" EFIC Hi Range.

AFW control with RCP 27.5" low range.

AFW should be used anytime an OTSG is dry.

I O

Rev. 7 E.05-8

1 E.05 O EXCESSIVE HEAT TRANSFER 5.0 E BOTH OTSGS ARE ISOLATED AND PRESSURE AND LEVEL CONTINUE TO DECREASE l

IlDiE

.1 Go to step 22, otherwise continue.

6.0 E ONE OTSG CONTINUES TO DECREASE IN PRESSURE THEN

.1 Go to step 14, otherwise continue.

STATUS ENTRY FROM STEP 29 O. REED OR STEAM LEAx 1S0tATEn.

CAUTION IT IS VERY IMPORTANT TO HOLD RCS TEMP CONSTANT TO PREVENT  !

THE PRESSURIZER FROM GOING SOLID. l 1

7.0 ESTABLISH HEAT TRANSFER TO BOTH OTSGS i

.1 Establish MFW to both OTSGs using Startup FW Control Valves.

.2 E MFW isHRT available THEN initiate EFIC channels A & B.

.1 E OTSG level is < 13.5" on EFIC THEN verify EFIC have initiated channels A & B.

.3 Adjust TBV on each OTSG to maintain present RCS temperature. E TBVs are not operable THEN use ADVs.

O Rev. 7

. E.05-7

O O -

INFORMATION PAGE O

8. 4 Pressurizer heaters interlock clears at 40" and must be reset on panel H1RC.

9.0 GUIDELINE 1 $

10.1 RC pump start interlocks.

< 30% Reactor Power RCP motor oil lift > 1,750 psig.

RCP motor upper bearing oil level 2 inches.

RCP motor lower bearing oil level 2 inches.

Seal injection flow > 3 gpm.

RCP CCW flow > 307 gpm To start fourth RCP Tc > 500T.

Motor 86 lockout (motor protection relay).

Normal - Green light dim.

Abnormal - Green light bright.

11.0 GUIDEIJNE 4 i

I O

Rev. 7 E.05-8 . I l

l

l E.05 EXCESSIVE HEAT TRANSFER CAUTION PRIOR TO THROTTIJNG HPI FLOW BELOW 105 GPM PER PUMP, HPI MINIFLOW VALVES SFV-23845, SFV-23848, AND MAKEUP TANK OUTLET r VALVE SFV-23508 MUST BE OPEN.

8.0 CONTROL HPI AS NECESSARY (RULE 2)

.1 Establish letdown and makeup, if isolated.

.2 Throttle HPI and stop HPI pumps as necessary to prevent i

exceeding RV thermal shock limits. (RULE 2)

)

.3 Avoid excessive subcooling margin. ( > 100*F)

! .4 Establish saturated conditions in the Pressurizer.

! .5 Establish Pressurizer level'at ~ 100 inches.

g '9.0 E THERE IS A LOSS OF SUBC00 LING MARGIN rHEN

.1 Go to E.03, otherwise continue.

10.0 E RCPs ARE NOT RUNNING THEN

.1 Start one RCP per loop.

.t Preferred RCP starting sequence is D, B, A, C.

11.0 2 AN OTSG TUBE RUPTURE IS INDICATED THEN

.1 Go to E.06, otherwise continue.

O Reir. 7

! E.05-9 l

INFORMATION PAGE O

12.0 Reactor Vessel Thermal Shock Criteria RCS temperature dropped below 500*F and exceeded a 100*F/hr cooldown rate.

DE RCS temperature dropped below 500*F and RCPs are off and HPI flow exists through any HPI Injection Valve as indicated on the HPI flowmeters.

The PTS limit takes priority over the fuel pin in compression limit.

O O

Rev. 7

. E.05-10 1

.)

E.05 O

EXCESSIVE HEAT TRANSFER 12.0 IE RV THERMAL SHOCK LIMITS ARE EXCEEDED TnEN

.1 Stabilize temperature and pressure: below the Interim Brittle Fracture curve and DEPRESSURIZE if in the restricted region. Pressurizer spray, pressurizer vents i or EMOV can be used as required to avoid or. exit the restricted region. (FIGURE 1)

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

STATUS AN OVERC00 LING HAS OCCURRED DUE TO EITHER EXCESSIVE FW OR A STEAM LEAK.

1 13.0 MAINTAIN STABLE RCS TEMPERATURE AND O PRESSURE. GO TO B.4 STATUS ENTRY FROM STEP 8 & 30 PRESSURE ANDILEVEL ARE STILL DECREASING ON ONE OTSG i

14.0 ALLOW THE STEAM LEAKING OTSG TO BOIL DRY.

DO NOT GD TO LOSS OF HEAT-TRANSFER, SECTION E.04.

l O

Rev. 7 E.05-11

3

".3-INFORMATION PAgg O

15.0 SPDS post trip display OTSG Tsat (purple vertical line) should be approximately equal to Tc.

15.1 Addition of AFW will raise the thermal center of the 01SG above the required OTSG level setpoint for heat removat O

j Rev. 7 E.05-12 l

i

E.05 O EXCESSIVE HEAT TRANSFER l

CAUTION IT IS VERY IMPORTANT TO HOLD RCS TEMP CONSTANT TO PREVENT THE PRESSURIZER FROM GOING SOLID.

15.0 ESTABLISH HEAT TRANSFER TO THE GOOD OTSG <

.1 E MFY is HQT available THEN initiate EFIC to only the good OTSG.

(NON-STEAM LEAKING) -

.2 Feed MFY to only the good OTSG. (RULE 4).

.1 E OTSG level is < 13.5" EFIC Iow Range on the GOOD OTSG THEN verify EFIC has initiated channels A & B.

.3 Adjust TBVs on OTSG without the steam leak to maintain RCS temperature at its present value.

E TBVs. fail to operate, use ADVs.

CAUTION PRIOR TO THROTTLING HPI FLOW BELOY 105 GPM PER PUMP, HPI MINIFLOW VALVES SFV-23845. SFV-23848, AND MAKEUP TANK OUTLET SFV-23508 MUST BE OPEN.

16.0 CONTROL HPI AS NECESSARY (RULE 2)

.1 Establish letdown and makeup, if isolated.

.2 Throttle HPI valves and stop HPI pumps as necessary to

, prevent exceeding RV thermal shock limits.

.3 Avoid excessive subcooling margin. (>100*F)

.4 Establish Pressurizer level at ~ 100 inches.

.5 Establish saturate conditions in the Pressurizer.

O Rev. 7 i E.05-13

O INFORMATION PAGE O

18.0 GUIDELINE 1 19.0 GUIDEllNE 4 0

20.0 Reactor Vessel Thermal Shock Criteria RCS temperature dropped below 5007 and exceeded a 1007/hr cooldown rate.

DB RCS temperature dropped below 500*F and RCPs are off and HPI flow exista through any HPI Injection Valve as indicated on the HPI flowmeters.

The PTS limit takes priority over the fuel pin in compression limit.

O Rev. 7 E.05-14

- - - . . . . -- .. . . _ . = - - ~ . _ . - . . ... - . . - . . - . - _ . - - - - . _ . - - - . . .

u E.05

' O EXCESSIVE HEAT TRANSFER 17.0 2 RB TEMPERATURE INCREASES TO 120T OR j 75% HUMIDITY 4 .THEN i .1 Start 4 RB Emergency Coolers i .2 Start A & B NSCW pumps.

.3 Start A & B NSRW pumps.

j 18.0 E THERE IS A LOSS OF SUBC00 LING i THEN i .1 Go to E.03, otherwise continue.

2 l

I 19.0 E AN OTSG TUBE RUPTURE IS INDICATED i

O rnen 1

.1 Go to E.08, otherwise continue.

l 20.0 E RV THERMAL SHOCK LIMITS ARE EXCEEDED '

1

) .IHEN i

l .1 Stabilize temperature and pressure below the Interim  :

Brittle Fracture curve and DEPRESSURIZE if in the  :

restricted region. Pressurizer spray, pressurizer vents ,

or EMOV can be used as required to avoid or exit the r j restricted region. (FIGURE 1)

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

. STATUS i RCS IS SUBC00 LED WITH PRESSURE AND TEMPERATURE STABLE. ONLY ONE 1 OTSG IS OPERABLE AND STEAMING TO THE CONDENSER OR ATMOSPHERE.

j I 21.0 GO TO CP.102 l O Rev. 7

! E.05-15 i

i

. _ _ . . _ . - . - - . . - . . . - - - - _ _ _ _ . , - , _ ~ _ - - - - _ - . . . . . . - , - - . _ , - . - - , . . . - . , _ , , , _ , , . . - . . - - . , . , . - . . . , . ,

^ 3 INFORMATION PAGE O

23.0 RB temperature on TJR-07 RB humidity on TIR-06 24.0 RC Pump start interlocks.

< 30% Reactor power RCP motor oil lift > 1,750 psig RCP motor upper bearing oil level 2 inches RCP motor lower bearing oil level i 2 inches Seal injection flow > 3 gpm RCP CCW flow > 307 gpm To start fourth RCP Tc > 500*F Motor 86 Lockout (Motor Protection Relay)

Normal - Green Light Dim Abnormal - Green Light Bright O

Rev. 7 E.05-16

E.05 dp l EXCESSIVE HEAT TRANSFER l STATUS I ENTRY FROM STEP 5 i

OVERC00IlNG IS OCCURRING FROM BOTH OTSGS.

i l 22.0 2 THE EMOV SETPOINT (2450) IS REACHED t

.THEN initiate HPI cooling.

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

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

.2 Balance HPI flow.

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

.4 Open EMOV. (PSV-21511) 1 .5 Run one RCP as long as subcooling margin is

maintained.

l q .6 Turn off pressurizer heaters.

v l 23.0 E RB PRESSURE, TEMPERATURE, OR j HUMIDITY IS INCREASING

! THEN

! .1 Go to step 33, otherwise continue.

l STATUS BOTH OTSGs HAVE STEAM IJNE BREAKS OUTSIDE THE RB.

24.0 E RCPs ARE NOT RUNNING AND SUBC00 LING l MARGIN IS ADEQUATE THEN

! .1 Start one RCP per loop.

l

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

t O

Rev. 7 E.05-17 I

,,,--,-.-_,--,---y- .,-,-,,-r- -c _--,-.y. - , -

,,,,,.,,my-- ,,-m-- .., .- n - . . -- ---,, _-, - ---, -,i., .- .

N INFORMATION PAGE g

25.0 Tickle feed is supplying AFW to an OTSG at limited rate attempting to maintain controlled decay heat removal 9

O Rev. 7 E. 05-tB

E.05 0 .

EXCESSIVE HEAT TRANSFER i

25.0 ESTABLISH HEAT TRANSFER TO BOTH OTSGs

.1 Trickle feed both OTSGs using AFY control valves.

.2 Feed the OTSGs as necessary to limit cooldown rate.

CAUTION PRIOR TO THROTTLING HPI FLOW BELOW 105 GPM PER PUMP, HPI MINIFLOW VALVES SFV-23645, SFV-23646, AND MAKEUP TANK OUTLET SFV-23508 MUST BE OPEN.

CAUTION WHEN HEAT TRANSFER IS RESTORED SECURE FROM HPI COOLING. AS

! SOON AS POSSIBLE TO PREVENT EXCEEDING T.S. C00LDOWN RATES.

I 26.0 WHEN HEAT TRANSFER HAS BEEN O ESTABLISHED, SECURE FROM HPI COOLING

.1 Establish letdown and makeup.

.2 Close

.1 EMOV.

IE EMOV (PSV-21511) ) does not close (PSV-21511 THEN close EMOV block valve (HV-21505).

.3 Control HPL (RULE 2)

.4 Reduce to one makeup or HPI pump.

.5 Turn on pressurizer heaters.

.6 Establish saturate conditions in the PZR.

.7 Establish PZR level at 100 inches.

O Rev. 7 E.05-19

O 9 .

1 INFORMATION PAGE O

27.0 Reactor vessel Thermal Shock Criteria RCS temperature dropped below 5007 and exceeded a 1007/hr cooldown rate.

DE RCS temperature dropped below 5007 and RCPs are off and HPI flow exists through any HPI Injection Valve as indicated on the HPI flowmeters.

The PTS limit takes priority over the fuel pin in compression limit 28.0 Tube to shell A T limit is 1007, 28.1 Tube to shell AT computer point A OTSG G-613 B OTSG G-814.

29.0 Pressure in the OTSGs can be controlled at about saturation pressure for the cold leg temperature. g 30.0 Pressure in the OTSG's cam be controlled at about saturation pressure for the cold leg temperature.

31.0 GUIDEllNE 4 O

Rev. 7 E.05-20

E ,s

.s

. .)

I E.05 O- EXCESSIVE HEAT TRANSFER 27.0 E RV THERMAL SHOCK LIMITS ARE EXCEEDED d

IHEN

.1 Stabilize temperature and pressure below the -Interim i Brittle Fracture curve -and DEPRESSURIZE if in the restricted region. Pressurizer spray, pressurizer vents or EMOV can be used as required to avoid or exit the restricted region. (FIGURE 1)

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

28.0 COMMENCE RCS C00LDOWN 1

.1 DQ. E.QI exceed 1007/hr cooldown rate.

29.0..E PRESSURE AND LEVEL CAN BE RESTORED O
TO BOTH OTSGS

, THEN

.1 Go to step 7, otherwise continue.

! 30.0 E PRESSURE AND LEVEL CAN BE RESTORED TO ONLY ONE OTSG i

j THEN

.1 Go to step 14, otherwise continue.

31.0 2 AN OTSG TUBE RUPTURE IS INDICATED I

IHEN

.1 Go to E.08 SGTR, otherwise continue.

1 lO l Rev. 7 E.05-21 i

O

  • l-INFORMATION PAGE 9

O Rev. 7 E.05-22

O O i

E.05 O EXCESSIVE HEAT TRANSFER i

}

I STATUS THE RCS IS BEING COOLED BY TRICKLE FEEDING RQIH OTSGs

! WITH AFY. BQIH OTSGs HAVE STEAM LINE BREAKS OUTSIDE 1- 0F THE RB.

1

32.0 GO TO B.4, SECTION 5-STATUS ENTRY FROM STEP 23 CAUTION PRIOR TO THROTTLING HPI FLOW BELOW 105 GPM PER PUMP. HPI MINIFLOW VALVES SFV-23845, STV-23848, AND MAKEUP TANK OUTLET SFV-23508 MUST BE OPEN.

33.0 IE IT IS DETERMINED THAT AT LEAST l,

O .

ONE STEAM LINE BREAK HAS OCCURRED l OUTSIDE THE RB 1

l Iggg I

] .1 Go to step 35. otherwise continue.

t i STATUS 1

j THE RCS IS BEING COOLED BY HPI COOLING. AT LEAST ONE AND POSSIBLY BOTH OTSGs HAVE STEAM LINE BREAKS IN THE RB AND j NEITHER OTSG CAN BE FED UNLESS IT IS LATER DETERMINED THAT

ONE OTSG HAS A STEAM LINE BREAK OUTSIDE THE RB.

i 34.0 GO TO CP.104 4

l0 Rev. 7 l

E05-23

O O .

INFORMATION PAGE 36.0 RC Pump start interlocks.

< 307. Reactor power RCP motor oil lift > 1,750 psig RCP motor upper . bearing oil level 2 inches RCP motor lower bearing oil level 2 inches Seal injection flow > 3 gpm RCP CCY flow > 307 gpm To start fourth RCP Tc > 500T Motor 88 Lockout (Motor Protection Relay) g Normal - Green Light Dim Abnormal - Green Light Bright 37.0 Trickle feed is supplying AFW to an OTSGat a limited rate attempting to maintain controlled decay heat removal O

Rev. 7 E.05-24

m -

4 E.05

, EXCESSIVE HEAT TRANSFER

! l i

STATUS i l

4 ENTRY FROM STEP 33 i AT LEAST ONE OTSG LEAK IS OUTSIDE THE RB. l I

1 35.0 IMMEDIATELY START 4 RB EMERGENCY COOLERS

{ .1 Start A Ac B NSCW pumps.

! .2 Start A de B NSRW pumps.

~,

36.0 IE RCPS ARE NOT RUNNING AND SUBC00 LING MARGIN IS ADEQUATE

! THEN O

~

.1 Start one RCP per io...

, .1 Preferred RCP starting sequence is Di B, A, C.

i 1

! 37.0 ESTABLISH HEAT TRANSFER TO ONLY THE OTSG

WITH THE STEAM LINE BREAK OUTSIDE OF THE RB 4 .1 Start AFY Pump P-319 and AFW Pump P-315 on
electric drive.

l .2 Trickle feed the OTSG with the steam line break -

! OUTSIDE the RB using AFW Control Valve.

I i

lO

! hv. 7 l E.05-25 i

s._.,_ . , _ _ _ _ _ . _ , - - - . . - _ - _ , - _ , _ . - . . - - . . _ . . _ . . . -

INFORMATION PAGE O

O 39.0 GUIDELINE I 40.0 Pressure in the OTSG can be controlled at about saturation pressure for the cold leg temperature.

O Rev. 7 E. 05- 26

j E.05 EXCESSIVE HEAT TRANSFER CAUTION PRIOR TO THROTTLING HPI FLOW BEIDW 105 GPM PER PUMP HPI MINIFLOW VALVES SFV-23645, SFV-23646. AND MAKEUP TANK OUTLET STV-23508 MUST BE OPEN.

38.0 WHEN HEAT TRANSFER HAS BEEN ESTABLISHED SECURE FROM HPI COOLING

.1 Establish letdown and makeup.

l .2 i

Close

.1 EMOV.

E EMOV (PSV-21511) ) does not close (PSV-21511 l

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

! .3 control HPL (RULE 2)

.4 Reduce to one makeup or HPI pump.

O .s rura == pres uri=er he ter .

.6 Establish saturate conditions in the PZR.

j .7 Establish P2R level at 100 inches.

i 39.0 E THERE IS A LOSS OF SUBC00 LING MARGIN IHEN

.1 Go to E.03. otherwise continue.

40.0 E PRESSURE AND LEVEL CAN BE RESTORED TO ONLY ONE OTSG

IHEN f .1 Go back to Step 14. otherwise continue.

l

O l hv. 7 l

E.05-27 4

r

O O -

INFORMATION PAGE O

41.0 GUIDELINE 4 9

42.0 Reactor vessel Thermal Shock Criteria RCS temperature dropped below 5007 and exceeded a 100T/hr cooldown rate.

.QB RCS temperature dropped below 5007 and RCPs are off and HPI flow exists through any HPI Injection Valve as indicated on the HPI flowmeters.

The PTS limit takes priority over the fuel pin in compression limit.

O O

Rev. 7 E.05- 28

4 O EXCESSIVE HEAT TRANSFER  !

, 41.0 2 A OTSG . TUBE RUPTURE IS INDICATED

! E j .1 Go to E.06, "SGTR", otherwise continue.

I i 42.0 E RV THERMAL SHOCK LIMITS ARE EXCEEDED

'tsrs I

.1 Stabilize temperature and pressure below the Interim

! Brittle Fracture curve and DEPRESSURIZE if in the  ;

j restricted region. Pressuriser spray, pressuriser vents or EMOV can be used as required to avoid or cxit the l restricted region. (FlGURE 1) 1 .2 The PTS limit remains in effect for the remainder of the  !

j cooldowne ,

O i

, STATUS l THE RCS IS BEING COOLED BY TRICKLE FEEDING ONE OTSG WHICH

! HAS A STEAM LINE BREAK OUTSIDE THE RB. THE OTHER OTSG HAS A l STEAM LINE BREAK INSIDE THE RB AND CANNOT BE FED.

1

{ 43.0 GO TO CP.102.

i ll  :'

i ll i  !

I s

! O 1 hv. 7 106-29 i  ;

i____..~.__.__.._______.______,.__ . . - , , _ . _ . _ _ _ _ . . - - _ . , _ . _____ __._._._ __ _ ..__.. -_,~_ _ ____ _ _ _

O G .

FIGURE 1 REACTOR COOLANT SYSTEM INTERIM FRACTURE LIMIT NO FORCED FLOW AND THERMAL SHOCK OPERATING REGION l l NOTE: Maintaining the reactor SATURATION 3000- ccolant subcooled takes precedence CURVE over the Interim Brittle Fracture vsg Curve (B&W 74-1122501 page 6) NO FORCED F14Y \

2800 OPERATING BAND INCORE TC's TO MONITOR W/HPI m 2000- PREFERRED ALTERNATE PTS CURVE

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RESTRICTED REGION l 0

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  • IF R8 L 1 ALLOW LEAKING -l TEMP > 120 YES START 4 RR 0T56 TO BOIL OR HUMIDITY > . COOLERS NSCW ORY 751 ,AND NSRW i-  : ' . ,

NO

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IP h 45 o , gg i ESTABLISH YES HEAT TRANSFER IF LOSS SCM  :

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' NO

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! 19 CONTROL HPI . YES l IF SGTR GO TO E.06 AS NECESSARY

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