ML20237H999

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Rev 0 to Emergency Instruction ES-3.1, Safety Injection Termination Following Steam Generator Tube Rupture
ML20237H999
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-3.1, NUDOCS 8708170454
Download: ML20237H999 (12)
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Text

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, Sequoyah Nuclear Plant DISTRIBUTION Cover Page 1 1C Plant Master File 1U Plant Supt (Mtn)

IC Technical Support Center

. 1U Eng~g Supv -

C}.3,,. (4) SE Training Office-IC Unit 1 Control Room IC Unit 2 Control Room IC SE Office -

IC Operations Supv (2) SE Training Office ,,

EMERGENCY INSTRUCTION 1U Plant Supv (0&E) 1U SE Training Office IU NSGPO III Class ES-3.1 1C Resident NRC Inspector, SN.P.

1U Compliance Supv-t IC POTC Director SI TERMINATION FOLLOWING SGTR 1C NUC PR Doc Ctr1. 1520 CST 2-C J 1U Plant Manager, WBNP IU NEB, W10C174C-K IC NSRS, 250 HBB-K IU Regulatory Engr (Sullivan)

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P ' Prepared By.: G. /trickland -

, Revised By: N/A [

Submitted By: mia _,

pu Su rvisor \

f[ PORC Review: OC 041984 }

M Date .-

Approved By: W Plant Manager J

.j Date Approved: C$I O4 ISO 4 s

The current revision level of this instruction is: 0 .

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

Instruction written per commitment to NUREG 0737.

The last page of this instruction is number 10 .

f' - , . .

l lL L B708170454 970911 PDR. ADOCK 05000327 p PDR ,

b . _ _ .

Sequoyah Nuclear Plant EMERGENCY INSTRUCTION

, , Cover Sheet Page 2 ES-3.1 History of Revisions Rev. Level Date Revised Pages Rev. Level Date Revised Pages -

(( 0 OCT 0 41984 All f

Ok en-me I

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, SQNP ES-3.1 Unit 1 or 2

, Page 1 of 10 Rev. O 1(f .

SI TERMINATION FOLLOWING SGTR A. PURPOSE This guideline provides the necessary instructions to terminate safety injection and stabilize plant conditions following a steam generator tube rupture.

B. SYMPTOMS None C. TRANSITION FROM OTHER INSTRUCTIONS E-3, Steam Generator Tube Rupture

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'A (

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, SQNP ES-3.1 TJnit 1 or 2

. Page 2 of 10 Rev. 0 SI TERMINATION FOLLOWING SGTR STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED C AUTION : SI must be terminated as quickly as possible after termination criteria are met in order to prevent ,

ruptured S/G overfill.

s 1 Reset SI Check P-4 interlock with

'SI reset, SI-268 2 Reset Phase A

.c 3 Stop ECCS Pumps Arid Place In Standby

a. RHR Pumps J(

(

e

b. SI Pumps
c. Au but one CCP 4 Establish Normal Charging
a. Close FCV-62-89
b. Open charging line isolation FCV-62-90 and 91
c. Open FCV-62-85 or 86
d. Adjust FCV-62-89 and 93 to establish following:
1) Seal injection flow s 8 gpm per RCP
2) Pzr level constant
e. Open seal water return FCV-62-61 and 63

SQNP ES-3.1 Unit 1 or 2

, Page 3 of 10 Rev. O SI TERMINATION FOLLOWING SGTR -

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED S Establish Letdown IF letdown can NOT be es tablished ,

a. Open letdown isolation TliEN establish excess valves : letdown s
1) FCV-62-69
2) FCV-62-70 _
3) FCV-62-77
b. Adjust letdown press

controller, FCV-62-81, N 25% open in manual

c. Open an orifice valve g d. Adjust FCV-62-81 for
  1. j( , desired press, then place in AUTO
1) 320 psig at normal letdown temp 6 Isolate BIT
a. Close BIT inlet FCV-63-39 and 40
b. Close BIT outlet FCV-63-25 and 26 i 1

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SQNP l ES-3.1 Unit 1 or 2

. Page 4 of 10 j Rev. O SI TERMINATION FOLLOWING SGTR STEP, ACTION / EXPECTED RESPONSE RESPONSE NOT OBTdINED 7 Verify ECCS Not Required

a. Pzr level > 20% [50% a. Manually start CCP FOR ADVERSE CNTMT] and/or SI Pumps to restore pzr level
b. RCS subcooling > 40 F, b. Manually start CCP and/or SI Pumps to restore subcooling.

8 Align CCP Suction To VCT

a. Open VCT outlet valves FCV-62-132 and 133

( b ., Close RWST valves

  1. {( FCV-62-135 and 136

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i SQNP l ES-3.1 Unit 1 or 2 Page 5 of 10 1

Rev. 0 SI TERMINATION FOLLOWING SGTR STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 9 Check VCT Makeup System

a. Makeup set for RCS boron concentration 10 Check If D/G Should Be Stopped
a. All shutdown boards energized a. Attempt to restore offsite by offsite power power per AOI-35
b. Place D/G in standby per SOI-82, Removing D/G From Service After An Emergency Start

)(k

, 11 Minimize Secondary System Contamination

a. Ensure turbine bldg sump aligned to unlined holding pond
b. Isolate unlined holding pond from dUfuser pond
c. Minimize leakage or drainage to turbine bldg sump
d. Ensure condensate DI bypassed
e. Check hotwell activity - e. IF hotwell activity NORMAL abnormal, TIIEN place dump back valve to CST to manu:ll and close

. . SQNP ES-3.1 Unit 1 or 2 Page 6 of 10 Rev. O SI TERMINATION FOLLOWING SGTR STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION: RCS press and ruptured S/G press must be maintained less than ruptured S/G PORV setpoint (1040 psig).

12 Maintain Pzr Level Between 20% And 80%- {50% And 80%

FOR ADVERSE CNTMT]

a. Adjust charging as necessary
b. Open letdown orifice valves as necessary ,,
c. Adjust letdown press control valve as necessary 13 Maintain RCS Press At Ruptured S/G Press
a. IF RCS depressurization stopped due to high pzr level, THEN continue RCS depressurization until RCS press < ruptured S/G press
b. Control pzr heaters as necessary
c. Use pzr normal sprays c. ,If letdown is in service, as necessary THEN use aux spray IF letdown NOT in se rvice ,

THEN use one pzr PORV and note following:

1) Upper head may void
2) PRT may rupture
, SQNP ES-3.1 Unit 1 or 2 Page 7 of 10 Rev. O SI TERMINATION FOLLOWING SGTR

%e STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 14 Check RCP Status

a. At least one RCP iunning a. Attempt to restart an . .

RCP (loop 2 preferred) per SOI-68.2 IF an RCP can NOT be Ea rted .

THEN verify natural circulation

, RCS subcooling S/G press stable or decreasing T-hot stable or

( ~

decreasing

\

'# { ( Core exit T/C stable or decreasing T-cold at saturation temp for S/G press IF natural circulation NOT verified, THEN increase dumping steam

b. Stop any RCP not required for RCS cooldown i

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, SQNP l . ES-3.1 Unit 1 or 2 Page 8 of 10 Rev. O i

SI TERMINATION FOLLOWING SGTR

! STEP ACTION / EXPECTED RESPONSE RESPONSE NOT ODTAINED l

l l

l 15 Check Main Turbine

a. Bearing oil pumps running (1500 rpm)
b. Bearing lift pump running (600 rpm)
c. Place turbine on turning gear af ter shaft stops 16 Align MSRs Normal
a. Press RESET on MSR control panel
b. Close HP steam to MSR i ,,

. isolation valves

c. Open starting vents
d. Close operating vents 17 Check Extraction Steam Valves And Drain Valves
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-3.1 Unit 1 or 2 Page 9 of 10 Rev. O lf

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SI TERMINATION FOLLOWING SGTR STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l 18 Shutdown Unnecessary Secondarv Plant Equipment

a. Leave 2 hotwell pumps N-running
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

.e 19 Check If Source Range Detectors Should Be Energized

a. Check intermediate range a. WHEN intermediate

-10 amps -10 flux range 5 10 flux 1 10 amps, THEN ensure source range detectors energized

b. Ensure source range detectors energized
c. Transfer NR-45 to one ,

source and intermediate range

s SQNP i

ES-3.1 Unit 1 or 2 P&ge 10 of 10 Rev. 0 i(( SI TERMINATION FOLLOWING SGTR STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 20 Complete SurveRiance And Reports

a. SI-268, Verification Of P-4 Interlock s.
b. SI-603 < ugh Flux Adjustment After Shutdown
c. SI-407 and SI-415 if reactor power decreased by > 15%
d. SI-38, Shutdown Margin ,,
e. SI-166.10 if the SI Pumps injected into RCS 1
f. AI-18, file package 18 for

( Reactor Trip Report and

.j - NRC notification q Note: ES-3.2, Post - SdTH Cooldown Using Backfill, is the preferred cooldown instruction due to reduced radiation releases; hwever, this cooldown method will be slow. ES-3.3, Post-SGTR Cooldown By Ruptured S/G Depressurization, should NOT be used because' the ruptured S/G will be depressurized to the secondary system.

Only in an extreme emergency which requires a rapid RCS cooldown should ES d' .3 be considered.

21 Go To Appropriate Pest-SGTR Cooldown Method

a. ES-3.2, Post-SGTR Cooldown Using Backfill O_R
b. ES-3.3, Post-SGTR Cooldown By Ruptured S/G Depressurization

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