ML20065K076

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Rev 9 to EOP ES-3.2, Post-SGTR Cooldown Using Blowdown
ML20065K076
Person / Time
Site: Ginna Constellation icon.png
Issue date: 03/30/1994
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17263A585 List:
References
ES-3.2, NUDOCS 9404190146
Download: ML20065K076 (15)
v • d • e


Text

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-a-ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE 1 of~10 v

ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW

~

PORC REVIEW DATE 0

X

/ /7l /s.L.

PLANT 5UPERINTENDENT

+/--l cpf EFFECTIVE DATE CATEGORY 1.O REVIEWED BY:

9404190146 940414 PDR ADOCK 05000244 p-PDR n

gp q

l' EOP:

f!!LEt.

REV: '9'

-ES-3.2-

' POST-SGTR COOLDOWN USING~ BLOWDOWN PAGE,2 of 10 A.-

PURPOSE - This' procedure provides actions to' cool down and depressurize the-plant-to cold shutdown conditions following a-SGTR.

This recovery method depressurizes the ruptured S/G by' s

draining via S/G blowdown.

r..4 B.

ENTRY CONDIT70NS/ SYMPTOMS 1.

ENTRY CONDITIONS - This procedure is entered from:

'E-3 STEAM GENERATOR TUBE RUPTURE, if-plant staff a.

selects the blowdown method.

I-

4 Em U RE.

REV: 9

{

ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN

-~l PAGE 3 of 10

\\

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED

' FOLDOUT page should be open AND monitored periodically, NOTE:

o Adverse CNMT values should be used whenever CNMT pressure is o

greater than 4 psig or CNMT radiation is greater than 10+05 R/hr.

1 Energize PRZR Heaters As Necessary To Saturate PRZR Water At Ruptured S/G Pressure 2 Check If SI ACCUMs Should Be Isolated:

a.

Check the following:

a. Co to ECA 3.1, SGTR WITH LOSS 0F.

REACTOR COOLANT - SUBC00 LED o RCS subcooling based on core RECOVERY DESIRED, Step 1.

exit T/Cs - CREATER THAN 0*F USING FIGURE MIN SUBC00 LING o PRZR level - GREATER THAN 5%

(30% adverse CNMT]

b. Dispatch A0 with locked valve key to locally close breakers 3

for SI ACCUM discharge valves

  • MOV-841, MCC C position 12F
  • MCV-865, MCC D position 12C
c. Close SI ACCUM outlet valves
c. Vent any unisolated ACCUMs:
  • ACCUM A, MOV-841

.1) Open vent valves for

  • ACCUM B, MOV-865 unisolated SI-ACCUMs,
2) Open HCV-945.
d. Locally reopen breakers for MOV-841 and MOV-865 J

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ES-3.2'

. POST-SGTR COOLDOWN USING BLOWDOWN PAGE 4'of'10 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4

NOTE:

Leakage from ruptured S/G into RCS will dilute RCS boron concentration.

3 Verify Adequate Shutdown Margin

a. Direct HP to sample RCS and ruptured S/G for boron concentration b, Verify boron concentration -
b. Borate as.necessary.

GREATER THAN REQUIREMENTS OF FIGURE SDM CAUTION IF CST LEVEL DECREASES TO LESS TilAN 5 FEET, THEN ALTERNATE WATER SOURCES FOR AFW PUMPS WILL BE NECESSARY (REFER TO ER AFW.1, ALTERNATE WATER ~ SUPPLY TO AFW PUMPS).

                                              • -A NOTE:

TDAFW pump flow control valves fail open on loss of IA.

  • 4 Monitor Intact S/G Level:
a. Narrow range level - GREATER
a. Maintain total feed flow greater THAN 5% [25% adverse CNMT]

than 200 gpm until narrow range level greater than 5% [25%

adverse CNMT] in' intact S/G.

b. Control feed flow to maintain

.b.

IE narrow range level in the narrow range level between 17%

intact S/G continues to increase (25% adverse CNMTj and 50%

in an uncontrolled manner, THEN go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT SUBC00 LED-RECOVERY DESIRED, Step.1.

j 1

' \\

-v

g EOP:

illLE:

REV: 9 ES -3.'2 '

POST-SGTR COOLDOWri USING BLOWDOWN L

PAGE 5'of 10' STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: Since ruptured S/G may continue to depressurize to less than the minimum RCS pressure necessary for continued RCP operation, cooldown to cold shutdown should not be' delayed.

5 Initiate RCS Cooldown To 350*F:

a.. Establish and maintain cooldown rate in RCS cold legs - LESS TilAN 100*F/HR

b. Dump steam to condenser from
b. Manually or locally dump steam intact S/G from intact S/G using.S/G ARV.

Jf no intact S/G available, THEN perform the following:

o Use faulted S/G.

-OR-o Go to ECA 3.1, SCTR WITH LOSS-0F REACTOR COOLANT -

SUBC00 LED RECOVERY DESIRED,'

Step 1.

1 i

'l

'l

a 6

(opt I t 'ILE :

REV: 9 l

ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE 6 of 10 m

ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED STEP

    • A CAUTION RCS AND RUPTURED S/G PRESSURES MUST BE MAINTAINED LESS THAN 1050 PSIC.
  • 6 Control RCS Pressure And Makeup Flow To Minimize RCS-To-Secondary Leakage:

Perform appropriate action (s) a.

from table PRZR RUPTURED S/G NARROW RANGE LEVEL LEVEL INCREASING DECREASING OFFSCALE 111C11 LESS THAN 13%

o Increase RCS Increase RCS o Increase RCS

[404 ADVERSE CNMTJ makeup flow makeup flow makeup flow o Depressurize o Maintain RCS j

RCS using and ruptured Step 6b.

S/G ressure equa l

BETWEEN 13%

Deprer,surize Energize Maintain RCS

[40% ADVERSE CNMTj RCS using PRZR and ruptured AND 50%

Step 6b.

heaters S/G pressure equal BETWEEN 50% AND 75% o Depressurize Energize Maintain RCS

[65% ADVERSE CNMT]

RCS using PRZR and ruptured Step 6b.

heaters S/G pressure equal i

o Decrease RCS makeup flow CREATER TIIAN 75%

o Decrease RCS Energize Maintain RCS i

(65n ADVERSE CNMTl rnakeup flow PRZR and ruptured j

heaters S/G pressure equal

b. Use normal PRZR spray to obtain
b. If letdown is in service, THEli desired results for Step 6a use auxiliary spray (A0V 296).

IF NOT, THEN use one PRZR PORV.

i'1

top:

title:

y, g

ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE-7:of 10-

. l-'

' \\.

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7 Establish Required RCS flydrogen Concentration (Refer to S-3.3C, 112 OR O2 REMOVAL FROM PRIMARY SYSTEM BY BURPING VCT) 8 Check If RCS Cooldown Should Be Stopped:

a. RCS cold leg temperatures - LESS a.

Return to Step 3.

THAN 350*F b.

Stop RCS cooldown

c. Maintain RCS cold leg temperature - LESS THAN 350*F
  • 9 Monitor Ruptured S/G Narrow Refill ruptured S/G to 67% [55%

O Range Level - LEVEL GREATER adverse CNMT] using feed flow.

THAN 17% [25% adverse CNMT) 1E either of the followin'g conditions occurs,'THEN stop feed flow to ruptured S/G; Ruptured S/G pressure decreases o

in an uncontrolled manner.

OR-Ruptured S/C pressure increases-o to 1020 psig.

i

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c;.

LOPS ilTLE:

.REV: 9 ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN

'PAGE 8 of.10 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED b'0JE :

Blowdown from ruptured S/G may be stopped when RHR system is placed in service.

p 10 Consult TSC To Determine IF blowdown can NOT be initiated; F

Appropriate Procedure To THEN go to alternate post-SGTR Establish Blowdown From cooldown procedure, ES-3.1, Ruptured S/G POST-SGTR C00LDOWN USING BACKFILL, Step 1, OR ES-3.3, POST-SGTR C00LDOWN USING STEAM DUMP, Step.1, v

  • 11 Control RCS Makeup Flow And Letdown To Maintain PRZR Level:

a.

PRZR level - GREATER TRAN 13%

a.

Increase RCS makeup flow as (40% adverse CNMT]

necessary and.go to Step 12.

b. PRZR level - LESS THAN 75% [65%

b, Decreases RCS makeup flow to adverse CNMT}

decrease level and go to Step 13.

t NOTE: The upper head region may void during depressurization if RCPs are not running. This may result in a rapidly increasing PRZR level.

  • 12 Depressurize RCS To Minimize RCS-To-Secondary Leakage:

?

a. Depressurize using normal PRZR
a. If letdown is in service, THEN spray depressurize using auxiliary spray valve (A0V-296).

IF NOT, THEN use one PRZR PORV.

b Energize PRZR heaters as necessary

c. Maintain RCS pressure at ruptured S/G pressure
d. Maintain RCS subcooling based on core exit T/Cs - GREATER THAN 0*F USING FIO"RE MIN SUBC00 LING o

,h'._.

.{l EOP:

I1TLEI

,REV: 9

-i

-ES-3.2

- POST-SGTR COOLDOWN USING BLOWDOWN-PAGE'9 of 10-

_}Q d

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED

  • 13 Monitor RCP Operation:

a.

RCPs - ANY RUNNING

a. Go to Step.14.

[

i

b. Check the following:
b. Go to Step 14.

-f o RCP n1 seal D/P - LESS THAN 220 PSID

-OR-Check RCP seal leakage - LESS o

THAN 0.25 GPM c.

Stop affected RCP(s) 14 Check If-RHR Normal Cooling Can Be Established:

t

a. RCS cold leg temperature - LESS
a. Return to Step 9.

THAN 350*F

b. RCS pressure - LESS THAN_
b. Return to Step 9.

400 psig [300 psig adverse CNMT]

c. Place RCS overpressure
c. JF RCS overpressure protection.

protection system in service system can NOT be placed in (Refer to 0-7, ALIGNMENT AND service, THEN notify TSC of OPERATION OF THE REACTOR VESSEL potential Tech Spec violation if; OVERPRESSURE PROTECTION SYSTEM)

RilR system is placed in service,

d. Establish RHR normal cooling (Refer to Attachment RHR COOL) i O

l n

- L s

o E0P.

fITLE:

7; REV:-9 ES-3.2 POST-SGTR'COOLDOWN USING-BLOWDOWN PAGE 10-of 10y Y(

~

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4

15 Continue-RCS Cooldown To Cold Shutdown:

a.

Maintain cooldown rate in RCS cold legs - LESS THAN 100*F/HR

b. Use-RHR System c.

Dump steam to condenser from

c. Manually or locally dump steam intact S/G using intact S/G ARV.

JJF no intact S/C available and RHR system NOT in service, THEN

- t perform the following:

F o Use faulted S/G.

-OR-o Go to ECA-3.1, SGTR WITH LOSS OF' REACTOR COOLANT -

SUBC00 LED RECOVERY DESIRED, i

Step 1.

l 16 Check Core Exit T/Cs - LESS Return to Step 9.

THAN 200*F 17 Evaluate Long Term' Plant Status:

a. Maintain cold shutdown conditions - (Refer to 0 2.3, PLANT AT COLD OR REFUELING SHUTDOWN)
b. Consult TSC

-END-

[

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6 139:

Titu:

REV: 9 ES-3.2 POST-SGTR COOLDOWN USING dLOWDOWN PAGE 1 of 1

,s

%Y ES-3.2 APPENDIX LIST TITLE PAGES 1)

RED PATH SUMi.ARY l

d 2)

FIGURE MIN SUBCOOLING 1

3)

FIGURE SDM 1

4)

ATTACHMENT RHR COOL 2

5)

FOLDOUT 1

v O

ls,_-)

2

0 i

E0P:

fifLE:

ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE 1 of l'

(

U RED PATH

SUMMARY

a.

SUBCRITICALITY - Nuclear power greater than 5%

b.

CORE COOLING - Core exit T/Cs greater than 1200*F

-OR-Core exit T/Cs greater than 700*F AND RVLIS level (no RCPs) less than 43% [46%

adverse CNMT) c.

HEAT SINK - Narrow range level in all S/Gs less than 5%

[25% adverse CNMT) AND total feedwater flow less than 200 gpm d.

INTEGRITY - Cold leg temperatures decrease greater than 100*F in last 60 minutes AND RCS cold leg temperature less than 285'F e.

CONTAINMENT - CNMT pressure greater than 60 psig O

(OPr TITLE:

REV: 9 l

'ES-3.2 POST-SGTR'COOLDOWN USING BLOWDOWN PAdE 1 of 1 L

v FIGURE MIN SUBCOOLING NOTE:

Suncooling Margin = Saturation Temperature From Figure Below [-] Core Exit T/C Indication RC"; PRESSURE (PSIG)

P.500 y _,.-tH:n=.,._m2 _tr y

2_u.

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21 INLREMENTS 20 PSIG c

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200 250 300 350 400 450 500 550 600 650 700 CORE EXIT SATURATION TEMPERATURE (*F) pG 1

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REV: 9

-ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE 1 of.1

)

t r

%,/

FIGURE SDM NOTE:

o Curve includes allowance for one stuck rod.

Add 100 ppm for each additional stuck rod.

o To obtain core burnup, use PPCS turn on code BURNUP.

BORON CONCENTRATION (PPM) 1800

. g..%........ i.y g.,n;j;g; j

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REV: 9 ES-3.2 POST-SGTR COOLDOWN USING BLOWDOWN PAGE 1 of 1 l

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FOLDOUT PAGE 1.

SI REINITIATION CRITERIA If either condition listed below occurs, THEN operate SI pumps manually as necessary and go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT - SUBCOOLED RECOVERY DESIRED, Step 1:

o RCS subcooling based on core exit T/Cs -

LESS THAN O'F USING REQUIREMENTS OF FIGURE MIN SUBCOOLING.

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PRZR level - CHARGING CAN NOT CONTROL LEVEL GREATER THAN 5% [30% adverse CNMT).

2.

SECONDARY INTEGRITY CRITERIA lE any S/G pressure is decreasing in an uncontrolled manner or is completely depressurized AND has not been isolated, THEN go to E-2, FAULTED S/G ISO LATION, Step 1.

'v 3.

COLD LEG RECIRCULATION SWITCHOVER CRITERION If RWST level decreases to less than 28%, THEN go to ES-1.3, TRANSFER TO COLD LEG RECIRCULATION, Step 1.

4.

AFW SUPPLY SWITCHOVER CRITERION 1E CST level decreases to less than 5 feet, THEN switch to alternate AFW water supply (Refer to ER-AFW.1, ALTERNATE WATER SUPPLY TO AFW PUMPS).

5.

MULTIPLE SLG TUBE RUPTURE CRITERIA If any intact S/G level increases in in an uncontrolled manner OR IF any intact S/G has abnormal radiation, THEN go to ECA-3.1, SGTR WITH LOSS OF REACTOR COOLANT - SUBCOOLED RECOVERY DESIRED, Step 1.

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