ML20237H616

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Rev 1 to Function Restoration Guidelines FR-H.1, Response to Loss of Secondary Heat Sink
ML20237H616
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-H.1, NUDOCS 8708170291
Download: ML20237H616 (13)
v • d • e


Text

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TENNESSEE VALLEY. AUTHORITY C

I( . SEQUOYAH NUCLEAR PLANT 1

~. j FUNCTION RESTORATION GUIDELINES ,

'l FR-H.1 RESPONSE TO L'OSS OF SECONDARY HEAT SINK L

Revision 1 ,

PREPARED BY: ,G . Stric_kland RESPONSIBLE SECTION: Operation [] /

REVISED BY: G. S I

k SUBMITTED BY:

//[M R6sp6nsible $e ti'on Supervisor h.

f PORC REVIEW DATE: 'AUG 2- 1985 APPROVED BY: ~P3 %) ism Plaht Manager DATE APPROVED: 'AUG 211985 Reason for revision (include all Instruction Change Fdrm Nos.):

Revised to add reference to status tree; clarify basis for stopping RCP during loss of AFW; change flow criteria to ensure -

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pumps running, to add reactor vessel head vent valves; add allowance tio exceed RCS cooldown limit.

The last page of this instruction is number: 11 8

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-S5dUOYAH-NUCLEAR PLANT

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PLANT INSTRUCTION REVISION LOG -

FUNCTIOt{. RESTO_ RATION _ GUID.ELINES FR-H.1 REVISION Date Pages REASON 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; clarify basis for stopping FCP during loss of AFW; change flow criteria to en-sure pumps running, to add reactor

-. vessel head vent valves; add allowance 1

i 21 E 1,s,8,10 to exceed RCS cooldown limit.

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= . . = - - . .....:...-_.-.__.; ._

0279L/mbs en I

SQNP o

FR-H.1 Unit 1 or 2 Page 1 of 11 Rev . 1 RESP'ONSE TO LOSS OF SECONDARY HEAT SINK -

A. PURPOSE This guideline provides actions to respond to a loss of secondary heat sink in all steam generators.

B. SYMPTOMS ~

t All S/G levels less than 25% and total AFW flow less than 440 gpm C. TRANSITION FROM OTHER INSTRUCTIONS

1. E-0, Reactor Trip Or Safety Injection

-)+ 2. Status Tree "

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SQNP  ;

FR-H.1 Unit 1 or 2 i l Page 2 of 11 Rev. 0

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1 RESPONSE TO LOSS OF SECONDARY HEAT SINK  !

i STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED Note: This instruction is NOT required if RHR is in service or RCS press is below intact S/G press

s. s 1 Check S/G WIDE Range Levels
a. At least one S/G WIDE a. IF all S/G WIDE range range level > 25% levels < 25%

[35% FOR ADVERSE [35% FOR ADVERGE CNTMT] , , .

CNTMT],

THEN:

1) Stop all RCPs
2) Immediately initiate RCS feed and bleed

.e - per steps 11 to 13 2 Check CST Level

a. CST level > 3 ft a. I_F CST level < 3 ft, THEN verify ERCW aligned to AFW
b. CST level > 17 ft b. IF CST level < 17 ft, THEN attempt to refill CST while continuing with this instruction i

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SQNP l FR-H.1 Unit 1 or 2 Page 3 of 11 Rev. O RESPONSE TO LOSS OF SECONDARY HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 3 Establish Motor-Driven AFW Pump Flow

a. Verify both motor-driven a. Start pumps from the  ;

AFW Pumps - RUNNING shutdown board t

b. Verify AFW level control b. Open valves from one valves - OPEN of the following:
1) Auxiliary control room
2) Remove valve control power
3) Remove valve operating air

( c., Verify motor-driven AFW c. Verify AFW manual valve

,, , J k Pump flow alignment per SOI-3.2 while continuing with this instruction

j SQNP FR-H.1 Unit 1 or 2 Page 4 of 11 Rev. O  ;

RESPONSL TO LOSS OF SECONDARY HEAT SINK

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l l

l 4 Establish Turbine-Driven AFW Pump Flow

a. Turbine steam supply ~ a. Open valves FCV-1-15, valves - OPEN 16,17, or 18 from Rx MOV Bd
1) FCV-1-15 or 16 IF FCV-1-51 closed
2) FCV-1-17 and 18 (HS-46-56),

THEN evaluate following: j

3) Trip and throttle valve  !

,, 1) Valve latched ,

to motor operator f

2) Mechanical everspeed reset
3) Thermal overloads

..c reset

b. Verify AFW level control b. Open valves from one of valves - OPEN the following:
1) Auxiliary control for LCV next to pump room
2) S/G 2 and 3 LCV handwheel at Aux
  • Bldg 714
3) S/G 1 and 4 LCV handwheel in West Valve Room
c. Verify AFW Pump speed c. Control pump speed indication locally
d. Verify turbine-driven AFW d. Verify AFW manual Pump flow valve alignment per S01-3.2 while continuing with this instruction

SQNP FR-H.1 Unit 1 or 2 Page 5 of 11 Rev. 1

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( RESP'ONSE TO LOSS OF SECONDARY HEAT SINK -

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBh'AINED 5 Check If Secondary Heat Sink IF total AFW flow < 440 gpm Restored AND au S/G narrow range levels < 10%, [25% FOR

a. I_F one of the following ADVERSE CNTMT],

conditions met: _. THEN evaluate stopping

-)6 RCPs based on following:

1) Total AFW flow to S/Gs > 440 gpm Delaying the time before S/G dry out OR

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Availability of

2) Narrow range level secondary system.

in at least one S/G **

  1. > 10% [25% FOR Continue with this y ADVERSE CNTMT] instruction.

THEN return to instruction

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  • in effect i

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SQNP FR-H.1 Unit 1 or 2 Page 6 of 11 Rev. O RESPONSE TO LOSS OF SECONDARY HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 6 Establish Main Feedwater Flow

a. Start condensate pumps as required: ,
1) Hotwell Pumps
2) Condensate Booster Pumps
3) DI Booster Pumps
b. Restart MFW Pump b. IF SI has actuated, THEN the following must
1) MFW pump controllers be performed prior to in manual and set to restarting the MFW Pump zero

( Reset SI

..cl - 2) MFW reg valve and k bypass valve controllers Notify inst to lift in manual and set to zero TB506-4 in back of SSPS logic cabinets

3) Reset MFW isolation 47 and 50 (clears P-4 seal-in for MFW isolation)
4) Restart MFW pump turbine
5) Open MFW isolation valves
6) Control MFW pump speed and feedwater bypass valve position to restore S/G icvel

SQNP FR-H.1 Unit 1 or 2 Page 7 of 11 Rev. O I

RESPONSE TO LOSS OF SECONDARY HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OETAINED .

7 Check If Secondary Heat IF MFW flow to at least one Sink Restored S/G verified, THEN maintain flow to

a. I_F narrow range level restore narrow range level in at least'one S/G

> 10% [25% FOR IF MFW flow NOT established, I ADVERSE CNTMT], THEN refer to SOI-2.1 while THEN return to continuing with this instruction instruction in effect 1

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2

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. .- SQNP FR-H,1 Unit 1 or 2 Page 8 of 11 Fev. 1

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RESPONSE TO LOSS OF SECONDARY HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT CBTAINED 8 Establish Condensate Flow

a. IF SI has NOT actuated, a. IF SI has actuated, THEN THEN the following must t be performed prior to
1)
  • Block P-11 when RCS resetting MFW isolation:

press < 1970 psig Reset SI

2) Block P-12 when RCS temp < 540 F Notify inst to lift TB506-4 in back of GSPS logic cabinets

-47 and 50 (clears P-4 seal-in for MFW isolation

b. Depressurize at least one g S/G I

A / , 1) Rapidly dump steam to condenser

1) IF condenser NOT available, THEN use S/G PORV W 2) Normal RCS cooldown M limit 100 F/hr may be
  • exceeded M 3) Depressurize S/G until condensate flow established I

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l 1

SQNP FR-H.1 Unit 1 or 2 Page 9 of 11 Rev. 0

l. RESPONSE TO LOSS OF SECONDARY HEAT SINI' STEP ACTION /EXP!"'"D RESPONSE RESPONSE NOT OBTAINED 9 Check If Secondary Heat Sink IF condensate flow to at Restored least one S/G verified, THEN maintain flow to
a. IF narrow range level in restore narrow range at least one S/G > 10% level (25% FOR ADVERSE CNTMT],

THEN return to instruction IF condensate flow NOT in effect stablished, THEN refer to SOI-2.1 while continuing with this instruction 10 Check S/G WIDE Range Levels

a. IF at least one S/G WIDE a. IF all S/G WIDE range range level > 25% 13vels < 25%

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[35% FOR ADVERSE CNTMT],

[35% FOR ADVERSE CNTMT],

,,, { k THEN continue attempts THEN immediately to establish one of the initiate RCS feed and following: bleed per following steps

1) AFW flow
2) MFW flow
3) Condensate flow wme - e,-e- .s-, - osr l

I

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, . SQNP l .

FR-H.1 Unit 1 or 2 j Page 10 of 11 Rev. 1 I

RESP'ONSE TO LOSS OF SECONDARY HEAT SINK -

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OB' PAINED 11 Actuate Phase A Isolation

a. Pnl M-6 _

l u l 12 Establish RCS Feed Path Do not proceed until at l least one CCP or SI Pump

a. Ensure CCPs injecting running and injection through BIT valves open
b. Ensure SI Pumps - RUNNING 13 Establish RCS Bleed Path IF both pzr PORVs can NOT Fe opened,
a. Open both pzr PORVs THEN
b. Open both pzr block valves Open reactor vessel

,, head vent valves y c. Stop all RCPs l Align High Pressure Fire Protection to at least one intact S/G Dcpressurize S/G until HPFP flow established 14 Attempt To Restore Secondary -

Heat Sink

a. AFW Pumps
b. MFW Pumps

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c. Condensate Pumps it. High Pressure Fire Protection Pumps
1) Install spool piece SQNP FR-H.1 Unit 1 or 2 Page 11 of 11 Rev. O RESPONSE TO LOSS OF SECONDARY HEAT SINK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Check If RCS Feed And Bleed Do not terminate RCS feed Can Be Terminated and bleed until all criteria satisfied .
a. Secondary heat sink restored
b. Core exit T/C - DECREASING
c. T-hot - DECREASING
d. RCS subcooling > 40 F
e. Reduce ECCS flow by ,

stopping ECCS pumps and closing pzr PORV as required to maintain RCS subcooling > 40 F and pzr level > 20%

[50% FOR ADVERSE CNTMT)

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f. Align normal charging and letdown prior to closing the last pzr PORV 16 Return To Instruction In Effect

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