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)
v • d • e


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p. FUNCTICd 'RESTORAI' ION GUIDELINES ,,

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RESPONSE TO IN'QEJUWTE CORE COOLING ,

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Revision 1 ll 'l 9

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PREPARED BY: G. Strickland

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RESPONSIBLE SECTIOUt. 'derations n .

REVISED BY: G. Str -

SUBMITTND'BY: [#[d DJ

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R e s p o n s i b 1 p 'S e c i o n S u p e r v i s o r l

PORC' REVIEW'DATF:

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l APPROVED BY: )

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j DATE APPROVED: AUG 211985 lf a.,

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

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i. .,2 Revised to add reference to' status tree; delete indicator num-1, t/ j L ' , , .g .

'bers; correct valve number. -

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  • 1 The last page of this instruction is number: 11 l i

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1 8708170283 870811 q PDR ADOCK 05000327 -

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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 1 NG 21 19E,1,2,4,9 number.

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  • 0280L/mbs

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 I

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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 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 a ri k

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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 -

.y 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 '

1

SQNP FR-C.1 Unit 1 or 2 l Page 5 of 11 (

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

..e j ( 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 Enditions can NOT be

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met, 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. F condenser NOT I_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% ~

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

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a. UHI )

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1) Injection starts at N 1200 psig
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 g 1) Injection starts at

.,t i. , 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

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STEP ICTIdN/5fPECfEU~55SPONSE ~ 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 j 2) Verify T-hot < 350 F 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 {

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 i

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SQNP FR-C.1 Unit 1 or 2

,- , Page 11 of 11 Rev. 0

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RESPONSE TO INADEQUATE CORE COOLING 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 I 2) Main condenser or

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, S/G PORVs

3) CST or ERCW 17 Return To Instruction In Effect

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