ML20237H796

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Rev 0 to Emergency Instruction ES-1.1, Post-LOCA Cooldown
ML20237H796
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 10/04/1984
From: Nobles L, Strickland G
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237H133 List: ... further results
References
ES-1.1, NUDOCS 8708170360
Download: ML20237H796 (14)
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Text

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3 --.g.

Sequoyah Nuclear Plant DISTRIBUTION 5'

.j Cover Page 1 1C Plant Master File IU Plant Supt (Mtn) 1C Technical Support Center lI 10 Engg Supv (4) SE Training Office Y.

IC Unit-1 Control Room IC Unit 2 Control Room IC SE Office IC Operationn Supv (2) SE Training Office EMERGENCY INSTRUCTION IU Plant Supv (0&E)

IU SE Training Office IU NSGPO III Class ES-1.1 1C Resident NRC Inspector, SNP..

IU Compliance Supv s

1C POTC Director POST LOCA C00LDOWN 1C NUC PR Doc Ctr1. 1520 CST 2-C IU Plant Manager, WBNP IU NEB, W10C174C-K IC ~ NSRS, 250 HBB-K IU Regulatory Engr'(Sullivan)

Prepared By:

G./trickland A

Revised By:

N/A /

Submitted By:

///d v

[

,u Su ervisor PORC Review: _

0 04 24 Date Approved By: r Plant Manager OCT 04 2 4 Date Approved:

The current revision level of this instruction is:

0 j

Reason for current revision (include all temporary change numbers) New instruction.

j Instruction written per commitment to NUREG 0737.

i The last page of this instruction is number 12 8708170360 97[PDRh PDR ADOCK O P

Sequoyah Nuclear Plant EMERGENCY INSTRUCTION 4

Cover Sheet Page 2 ES-1.1 History of Revisions Rev. Level Date Revised Pages Rev. Level Date Revised Pages

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0CT 0 41984

_0 Al1 9

m e

a l

l 1

SQNP ES-1.1 Unit 1 or 2 l

Page 1 of 12 Rev. O I(F POST LOCA COOLDOWN A.

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

B.

SYMPTOMS

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None C.

TRANSITION FROM OTHER INSTRUCTIONS E-1, Loss Of Reactor Or Secondary Coolant

.x _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

SQNP ES-1.1 Unit 1 or 2 Page 2 of 12 Rev. O POST LOCA COOLDOWN STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED C AUTION :

If RWST level decreases to less than 29%, then align ECCS suction to the entmt sump using ES-1.2, Transfer To RHR Cntmt Sump CAUTION:

If offsite power is Mst after SI reset, then manual action will be required to restart the SI Pumps and RHR Pumps.

1 Reset SI Check P-4 interlock with Si reset, SI-268

(

2 Reset Phase A And Phase B

..e l 3

Ensure Cntmt Air Supply In Service a.

Air compressors - RUNNING b.

Cntmt air supply valves on elev 714 - OPEN

1) FCV-32-80 (81)
2) FCV-32-102 (103)
3) FCV-32-110 (111)

SQNP E S-1.1 Unit 1 or 2 Page 3 of 12 Rev. O F

I POST LOCA COOLDOWN

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBT \\INED 4

Chec~k If D/G Should Be Stopped a.

All shutdown boards a.

Attempt to restore, energized by offsite offsite power per AOI-35 power A

b.

Place D/G in standby per

]

SOI-82, Removing D/G from l

Service After An Emergency j

Start 5

Check If UHI Should IF UHI injected, Be Isolated TilEN verify isolation valves closed and gag a.

WHEN RCS press isolation valves 51900 psig AND STABLE,

,C THEN isolate UHI 6

Check If Cold Leg Accumulators Should Be Isolated a.

WHEN RCS press 51000 psig TND STABLE, TN,_:

1) Restore power to isolation valves
2) Close cold leg accumulator
2) IF isolation valve isolation valves can NOT be closed, THEN vent any unisolated accumulator

~

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SQNP ES-1.1 Unit 1 or 2 Page 4 of 12 Rev. O POST LOCA COOLDOWN STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION:

If RCS press decreases to 180 psig, then the RIIR Pumps must be manually restarted.

7 Check If RHR Pumps Should Be Stopped a.

Check RCS press a.

IF RCS press low or decreasing,

1) RCS press > 180 psig THEN establish CCS to RHR heat exchanger.

Go to next step

2) RCS press - STABLE OR INCREASING b.

Stop RHR Pumps and place in standby

.x i

8 Check Intact S/G Levels a.

Narrow range S/G a.

Verify AFW flow and levels > 25%

intact S/G levels l

returning to normal program b.

Control S/G levels between b.

IF any S/G level continues 25% and 50%

to increase with no AFW flow,

THEN go to

  • E-3, STEAM GENERATOR TUBE RUPTURE _ _ - _ _ _ _ _ - - - - - - - - - - _ - -

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SQNP ES - 1.1 Unit 1 or 2 Page 5 of 12 Rev. O POST LOCA COOLDOWN STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 9

Initiate Rapid RCS Cooldown To Cold Shutdown a.

Maintain T-cold cooldown

< 100 F in any 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> b.

Dump steam to condenser b.

II[ condenser NOT available,

THEN use intact S/G PORV 10 Depressurize RCS And Establish Pzr Level a.

During RCS depressurization,

a.

IF RCS subcooling maintain RCS subcooling NOT met,

> 40 F THEN reestablish RCS g

', { k subcooling before continuing depressurization b.

Depressurize RCS using b.

I_F normal sprays NOT normal pzr sprays in order available,

to Mcrease ECCS flow and THEN use one pzr PORV decrease break flow and note following:

1) Upper head may void during depressurization
2) Minimize cycling PORV
3) PRT may rupturn IF both normal sprays AND PORVs not available, TIIEN use aux spray' c.

Stop depressurization

_ _20's when pzr level

[50% FOR ADVERSE NTMT] I l

I

a

SQNP E S-1.1 Unit 1 or 2 Page 6 of 12 Rev. O POST LOCA COOLDOWN STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED C AUTION :

Normal T-avg indication and associated interlocks will be inaccurate during natural circulation or when RCS temp is below 530 F.

11 Check RCP Status a.

At least one RCP running a.

Evaluate if an RCP should be started considering

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cntmt conditions l

IF an RCP should be res tarted,

THEN start an RCP per SOI-68.2 (loop 2 preferred)

IF an RCP can NOT C

be started, THEN verify natural circulation RCS subcooling S/G press stable or decreasmg T-hot stable or decreasing Core exit T/C e

stable or decreasing T-cold at saturation temp for S/G press IF natural circulation iTOT verified,

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THEN increase dumping steam b.

Stop any RCP not required for cooldown

-G-e

eqV SQNP ES-1.1 Unit 1 or 2 Page 7 of 12 Rev. 0 POST LOCA COOLDOWN STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Align CCP To Charging Flow Path a.

Ensure pzr level > 20%

a.

Do not proceed until

~

[50% FORN ADVERSE CNTMT]

pzr level > 20%

[50% FOR ADVERSE CNTMTl h.

Leave both CCPs running c.

Establish normal charging

1) Close FCV-62-89
2) Open charging line isolation FCV-62-90 and 91
3) Open FCV-62-85 or 86 g
4) Adjust FCV-62-89 and 93 to maintain following:

a) Seal injection flow I

b) Pzr level > 20%

[50% FOR ADVERSE CNTMT]

d.

Isolate BIT

1) Close BIT inlet FCV-63-39 m4d 40
2) Close BIT outlet FCV-63-25 and 26 SQNP ES-1.1 Unit 1 or 2 Page 8 of 12 Rev. O POST LOCA COOLDOWN STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4

13 Continue RCS Depressurization a.

During RCS depressurization,

a.

1F RCS subcooling.

maintain RCS subcooling NOT met,

> 40 F TliEN reestablish before continuing depressurization b.

Depressurize RCS using b.

IF_ normal sprays normal pzr sprays in NOT available, order to decrease the TIIEN use aux spray break flow IF normal sprays and aux spray NOT available.

THEN use one pzr PORV and note following:

1) Upper head may C-void during depressurization
2) Minimize cycling PORV
3) PRT may rupture c.

Control pzr heaters as necessary I

4 l

5.

j

SQNP ES-1,1 Unit 1 or 2 Page 9 of 12 Rev. O POST LOCA COOLDOWN I

i STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBT^INED C AUTION :

If pzr level decreases uncontrolled, then restart ECCS pumps to restore pzr level.

t Note:

The following step does not have to be completed prior to continuing with this instruction.

14 Reduce ECCS Flow While Maintaining Pzr Level a.

Maintain pzr level > 20%

[50% FOR ADVERSE CNTMT]

b.

WHEN charging flow is g

between 50 and 100 gpm, e{

THEN:

1) Stop one ECCS pump; Stop SI Pumps prior to CCPs
2) Maintain pzr level c.

As RCS depressurization continues and pzr level permits, then repeat step b until only one CCP is required to maintain pzr level i

9

SQNP ES-1.1 Unit 1 or 2 Page 10 of 12 Rev. O POST LOCA COOLDOWN 4

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED i

i 4

15 Check Main Turbine j

a.

Bearing oil pumps '

running (1500 rpm)

\\

b.

Bearing lift pump running (600 rpm) c.

Place turbine on turning gear after shaft stops 16 Align MSRs Normal a.

Press RESET on MSR control panel b.

Close IIP steam to MSR isolation valves c.

Open starting vents d.

Close operating vents 17 Check Extraction Steam Valves And Drain Valves l

1 a.

Close heaters 1 and 2 extraction steam valves b.

Open turbine drain valves c.

Open MFW pump turbine drain valves d.

Locally open extraction drain valves, HS-5-94

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SQNP ES-1.1 Unit 1 or 2 Page 11 cf 12 Rev. 0 POST LOCA COOLDOWN 1

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STEP

' ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Shutdown Unnecessary Secondary Plant Equipment a.

Leave 2 hotwell pumps running V b.

Leave 1 condensate booster pump running c.

Stop DI booster pumps d.

Stop heater drain tank pumps and close discharge valves e.

Open exciter field breaker and place voltage regulator in off position C

.e 19 Check If RCPs Must Be Stopped a.

WHEN conditions for running RCPs can NOT be maintained, THEN stop RCPs 20 Check If RHR Can Be Placed In Service a.

Check the following:

1) RCS temp 5 350 F
2) RCS press 5 380 psig b.

Consult TSC to determine if RHR should be placed in service per SOI-74.1 A c.

IF RHR placed in service, THEN use RHR and S/G for cooldown

-1.-

SQNP E S-1.1 Unit 1 or 2 c

Page 12 of 12 Rev. O POST LOCA COOLDOWN j

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l

1 21 Continue RCS Cooldown And Depressurization 22 Evaluate Long Term Plant Status a.

Maintain cold shutdown b.

Consult with plant staff I

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A

. END -

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