ML20237H593

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Rev 1 to Function Restoration Guidelines FR-C.1, Response to Inadequate Core Cooling
ML20237H593
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 08/21/1985
From: Patterson B, Strickland G
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237H133 List: ... further results
References
FR-C.1, NUDOCS 8708170283
Download: ML20237H593 (13)
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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT

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4 FUNCTICd 'RESTORAI' ION GUIDELINES p.

i FR--C.' 1 '

RESPONSE TO IN'QEJUWTE CORE COOLING u

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PREPARED BY:

G. Strickland

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RESPONSIBLE SECTIOUt. 'derations n.

REVISED BY:

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((I SUBMITTND'BY:

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Pltnti Manager

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DATE APPROVED:

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Reason for revision (include all Instruction Change Form Nos.):

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2 Revised to add reference to' status tree; delete indicator num-1, t/

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'bers; correct valve number.

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The last page of this instruction is number:

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%er SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG FUNCTION RESTORATION GUIDELINES FR-C.1 REVISION Date Pages REASUN FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS) 0 10/04/84 All Revised to add reference to status tree; delete indicator numbers; correct valve NG 21 19E,1,2,4,9 number.

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SQNP FR-C.1 Unit 1 or 2 Page 1 of 11 Rev. 1 RESPONSE TO INADEQUATE CORE COOLING A.

PURPOSE This guideline provides actions to restore core cooling.

B.

SYMPTOMS g

Refer to status tree C.

TRANSITION FROM OTHER INSTRUCTIONS Status Tree Iek

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SQNP l

FR-C.1 Unit 1 or 2 Page 2 of 11 Rev. 1 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTkINED l

CAUTION: 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 1

Verify ECCS Flow In All Trains a.

Both CCPs - RUNNING b.

Both SI Pumps - RUNNING c.

Both RHR Pumps -

RUNNING d.

Flow through BIT

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IF RCS press < 1500 psig, THEN verify SI Pump flow

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4 f.

.IF RCS press < 180 psig, THEN verify RIIR Pump flow g.

IF_ RHR aligned to entmt

sump, THEN verify RIIR alignment per one of the following:

ES-1.2, Transfer To RHR Cntmt Sump -

Appendix ES-1.3, Transfer To Hot Leg I

Recire - Appendix l

SQNP FR-C.1 Unit 1 or 2 Page 3 of 11 Rev 0 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE R_ESPONSE NOT OBTAINED 2

Open Ice Condenser AHU ACBs a.

Rx Vent Bd A-A Compt 6E and 7D b.

Rx Vent Bd B-B Compt 4D and 6E 3

Energize Hydrogen Ignitors a.

Pnl M-10 4

Start Charging PD Pump a.

Refer to SOI-62 g~

as required ri a

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SQNP FR-C.1 Unit 1 or 2 Page 4 of 11 Rev. 1 l(

k RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 5

Check Source Of RCS Depressurization a.

Pze PORVp - CLOSED a.

IF RCS press < 2335 psig, THEN close pzr PORV OR block valve b.

Letdown isolated

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1) FCV-62-69, 70, 72, 73, and 74 c.

Excess letdown isolated

1) FCV-62-54 or 55 l

d.

Pzr normal sprays - CLOSED

.e ef Aux spray valve - CLOSED f.

Pzr safety valves - CLOSED f.

Cooldown RCS and depressurize to allow safety valve to reseat g.

Reactor vessel head vent -

CLOSED h.

RCS sample valves - CLOSED

1) FCV-43-2 or 3
2) FCV-43-11 or 12
3) FCV-43-22 or 23 1.

Post accident sample valves

- CLOSED j

1) FSV-43-250 or 251
2) FSV-43-309 or 310

SQNP FR-C.1 Unit 1 or 2 l

Page 5 of 11

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Rev. 0 RESPONSE TO INADEQUATE CORE COOLING l

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 6

Check RCP Status a.

IF all 4 RCPs running, THEN stop loop 1 RCP in order to reserve the RCP for future use i

b.

Do NOT stop any other operating RCP c.

Attempt to establish and/or maintain conditions necessary for RCP operation

1) Refer to SOI-68.2 l

as required

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d.* Do NOT attempt to restart any RCP at this time e. _ _ _ _ _ _ _ _ _ _.

SQNP FR-C.1 Unit 1 or 2 Page 6 of 11 Rev. 0 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7

Check If Core Cooling Restored a.

IF core exit T/Cs < 700 F, a.

IF all of the following THEN return to instruction conditions met:

in effect Core exit T/Cs

< 1200 F Core exit T/Cs decreasing THEN maintain ECCL flow until core cooling restored IF any of the above I(

Enditions can NOT be

met,

,e THEN continue with the next step 8

_ Check If Accumulators Available a.

IF UHI has NOT injected, a.

IF UHI has injected, TIIEN ensure UHI isolation THEN ensure isolation valves - OPEN valves closed and gagged b.

Restore power to cold leg accumulator isolation valves c.

Cold leg accumulator isolation valves - OPEN t'

SQNP FR-C.1 - Unit 1 or 2

' Page 7.of 11 Rev. 0 -

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. RESPONSE TO INADEQUATE CORE COOLING STEP ACTION /E.XPECTED RESPONSE RESPONSE NOT OBT INED 9-Check CST Level a.

CST level > 3 ft a.

I_F CST level < 3 ft, THEN verify ERCW -

flow to AFW b.

CST level > 17 ft b.

IF CST level < 17 ft,'

.THEN attempt to refill CST while continuing with this instruction 10 Check Intact S/G Levels a.

Narrow range S/G levels a.

Verify AFW flow and

> 25%-

intact S/G levels returning: to normal program J.

br ' Control S/G levels between 25% and 50%

.11 Cooldown RCS a.

Depressurize all intact S/Gs a.

IF NO intact S/G' exists, THEN use one non-intact S/G for cooldown b.

Dump steam to condenser b.

I_F condenser NOT F

available, THEN use intact S/G PORVs c.

IF core exit T/Cs c.

IF core exit T/Cs

< 1200 F,

> 1200 F, THEN:

THEN cooldown as quickly as possible

1) Cooldown as quickly as possible but do not

. exceed T-cold cooldown of 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 />

2) Maintain intact S/G levels s 33%

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SQNP FR-C.1 Unit 1 or 2 Page 8 of 11 Rev.0 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED 1.ESPONSE RESPONSE NOT OBTAINED 12 During RCS Cooldown, Allow Accumulators To Inject a.

UHI

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1) Injection starts at 1200 psig N
2) AFTER UHI injection, l

ensure UHI isolation valves closed and j

gagged in order to prevent nitrogen injection into RCS b.

Cold leg accumulators

1) Injection starts at g

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s 400 psig k

2) WHEN RHR starts 2)

F isolation valve injecting into RCS, can NOT be closed, THEN isolate cold THEN vent any leg accumulators unisolated accumulators l

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SQNP FR-C.1 Unit 1 or 2 Page 9 of 11 Rev. 1 i

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RESPONSE TO INADEQUATE CORE COOLING STEP ICTIdN/5fPECfEU~55SPONSE

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~ RESP 6 SE NOT DETAINED 13 Verify ECCS Flow Continue RCS cooldown until RHR starts infecting.

g a.

Flow through BIT g

b.

SI Pump f' low d'

c.

RHR Pump flow d.

WHEN RHR starts injecting into RCS, THEN:

1) Ensure UHI and cold
1) IF isolation valve leg accumulators En NOT be closed, isolated THEN vent any unisolated accumulators
2) Verify T-hot < 350 F j

THEN stop all RCPs 14 Check If Core Cooling Restored IF core exit T/Cs < 1200 F, THEN continue RCS cooldown a.

E all of the following and ECCS flow until core conditions met:

cooling restored

1) Core exit T/Cs E core exit T/Cs > 1200 F,

< 700 F THEN continue with the next step

2) At least two T-hot

< 350 F THEN return to instruction in effect

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SQNP FR-C.1 Unit 1 or 2 Page 10 of 11 Rev. 0 l(F '

RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Check If RCP Must Be Started a.

IF core exit T/Cs > 1200 F a.

IF core exit T/Cs THEN

< 1200 F, THEN repeat the

1) Start one RCP; previous steps until Normal RCP starting core cooling restored conditions NOT required
2) Attempt to establish RCP support conditions while continuing
3) IF core exit T/Cs remain 21200 F, THEN start additional r

RCPs as required 4 (

4) E all available RCPs running and core exit T/Cs 21200 F, 1

THEN ensure at least

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one CCP or SI Pump i

running, THEN open all pzr PORVs and block l

valves

5) Maintain RCPs in operation until joint SRO and administrative l

decision made to stop RCP 1

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SQNP FR-C.1 Unit 1 or 2 Page 11 of 11 Rev. 0 RESPONSE TO INADEQUATE CORE COOLING

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STEP

. ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED-1 16 Attempt To Restore Normal RCS Cooling a.

ECCS Systems:

1) CCP
2) SI Pumps
3) RHR Pumps
4) RWST or entmt sump b.

Secondary heat sink:

1) AFW Pumps
2) Main condenser or I

S/G PORVs

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3) CST or ERCW 17 Return To Instruction In Effect

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