ML20237J043

From kanterella
Jump to navigation Jump to search
Rev 1 to Emergency Contingency Instruction ECA-0.0, Loss of All AC Power
ML20237J043
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 06/24/1987
From: Nobles L, Strickland G, Terpstra G
TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20237H133 List: ... further results
References
ECA-.0, ECA-0.0, NUDOCS 8708170471
Download: ML20237J043 (19)
v • d • e


Text

.:

O 4

't TENNESSEE '!ALLE( AUTHORITY

- b l

SEQUDYAH NUCLEAR PLANT EMERGENCY CONTINGENCY INSTRUCTION ECA-0.0 LOSS OF ALL AC PCHER Revision 1 PREPARED BY: G. Strickland RESPONSIBLE SECTICN: Ocerations REVISED BY: G. L. -erestra SUBMITTED SY:, <wt. ?IM.fbL_

[Jescondble section supervisor PORC REVIEW DATE: JW 2 41987 APPROVED SY- *-

  • Plant Manager DATE APPROVED: J 24 037 Reason for revision (include all Instruction Change Form Nos.):

Revisea to add REP steo I due to ICF B6 1473 and for enhancement /c!aci'i-catien to step 23 (V and V comment) and steo 21 cart 6 'revisea to serie/

SFP levol \bove alarm) and ste M 8/20 refarencea 501-88.1 for sentainment isolation.

The last page of this instruction is numoer: 36 I

B708170471 870811 l PDR ADDCK 05000327 l p PDR I

_ _ _ _ _ _ _ - _ _ _ _ _ _ _ ____ E

SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG EMERGENCY CONTINGENCY INSTRUCTION ECA-0.0 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected HENTS AND ALL ICF FORM NUMBERS)

New instruction written per commitment 0 08/21/85 ALL to NUREG 0737.

Revised to add REP step 1 due to ICF 86-1473 and for enhancement / clarification to step 3 (V and V comment) and step 21 part 6 (@ revised to verify SFP level JUN 2 4 1987 above alarm) and steps 18/20 referenced 1 ALL SOI-88.1 for containment isolation.

l l

0348L/ldw L______ _ _ _ _ . _ - - - - - - - - - - - - - - - - - - - - - - -

SQNP ECA-0.0 Unit 1 or J Page 1 of 16 Revision 1 l

l l

LOSS OF ALL AC POWER A. Pl!RPOSE l

l

1. Isolate RCP seal cooling
2. Cooldown RCS using Turbine-driven AFW Pump
3. Inject UHI and cold leg accumulators 1.

When AC power restored, then establish ERCW flow and go to recovery guideline B. SYMPTOMS Loss of all AC power C Tit ANSITION FROM OTlIER INSTRUCTIONS ~

E-0. React 6r Trip Or Safety injection ES1ERGl'! A lite

SQNP ECA -0. 0 Unit l'or 2 Page 2 of 16 Revision 1 l s l LOSS OF ALL AC POWER 1

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED Note- The purpose of this ECA should be reviewed prior to using this instruction Note:

l Status Trees should be monitored for int'ormation only.

FRGs should not be implemented l

1 Initiate REP Per IP-1

a. Notify Operations Duty Specialist within 5 min 2

Check If RCS is isolated

a. Pzr PORVs - CLOSED t. IF_ RCS press

< 2035 pcig, TilEN close PORV

b. Verify letdown isolated
1) FCV-62-69, 70, 72, 73, and 74 - CLOSED
c. Verify excess letdown isolated l
1) FCV-62-54 or 55 -

CLOSED i

1 E.TIElt GP/A nac

SQNP ECA-0.0 Unit 1 or 2 Page 3 of 16 y Revision 1

.(

LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 3 Verify Turbine-Driven IF AFW flow ( 440 gpm, AFW Flow > 440 gpm TIIEN verify turbine runnmg and establish

a. Dispatch operator with AFW flow radio to LCV handwheels
a. Locally open turbine-driven LCV
1) S/G 2 and 3 LCV handwheel at Aux Bldg 714
2) S/G 1 and 4 LCV handwheel in West Valve Room 1

Trv To Restore Power To

'[ Shutdown Boards ~

a. Refer to AO! .35, Loss Of Of fsite Power
b. Energize shutdown boards from D/G
1) Start D/G 1) Emergency start D/G
2) Verify shutdown boards energized 2) IF shutdown boards can NOT be energized.

THEN trip D/G and energize shtttdown boards from offsite power e

IF at least one shutdown board energized, TilEN return to instruction tTeifect DIERGP/A -a-

. sac

a.

SQNP EC A-0. 0 Unit 1 or 2 Page 1 of 16 -

Revision 1

~ LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION: When power is restored to a shutdohn board. recovery actions should continue with step 22 ,

1 CAUTION: If an SI signal exists or if an SI signal is aEtuated during this guideline, it should be reset to permit manual loading of equipment on' shutdown board l

CAUTION :

An ERCW pump shoilld be kept available to automatically load on the shutdow6 board to provide diesel generator cooling

\ ,.

5 . Place Following Eguipment , ,  !

JMULL TO LOCK

a. CCPs _ ( 4
b. S1 Pumps
c. RHR Pumps
d. Cntmt Spray Purrps > >
e. >1otor-driven AFW Pumps
f. CCS Pumps
g. Pzr heaters s 4

i-EMERCP/A t-ne

!- i 1

l l* SQNP EC A-0. 0 Unit 1 or 2 Page 5 of 16 Revision 1

<u l LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l'

6 Isolate RCP Seal Cooling

a. Close RCP number 1 seal leakoff valves
1) FCV-62-9
2) FCV O-22
3) FCV-62-35
4) FCV-62-48
b. Isolate RCP seal return using reach 3 ods outside seal water filter cubicle

- Aux Bldg 690 l)62-642 seal water ~

filter inlet isolation

2)62-643 seal water filter bypass isolation
c. Isolate RCP seal injection using reach rods outside seal water injection filter cubicles - Aux Bldg 690
1)62-546 seal water injection tilter bypass isolation '.

1

2)62-549 seal water injection filter A i

outlet isolation

3)62-550 seal water injection filter B outlet isolation

- Step Continued On Next Page -

I 1

l I

ENEllGP/A I

. tac i

l

t-SQNP ECA-0.0 Unit 1 or- 2 Page 6 of 16 f

4.

Revision 1 L

LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED

'G lsolate RCP Seal Cooling (cont. )

d. Isolate RCP thermal barrier - Aux Bldg 714
1) 70-677A thermal barrier booster pump A discharge isolation
2) 70-677B thermal i barrier booster pump B' discharge isolation 7 Isolate CST From Hotwell
a. Isolate condenser vacuum drag LCV-2-9 using _

manual valves next to number 7 heater drain tank - Turb Bldg 685

1) 2-522 auto makeup LCV isolation
2) 2-525 auto makeup LCV bypass isolation 8 Check S/G Status
a. CLOSE SISIV and bypass valves
b. Verify 31FW reg and bypass valves - CLOSED
e. Verify S/G blowdown valves - CLOSED D1ERGP/A -n-aac

I

c. SQNP ECA-0.0 Unit 1 or 2 Page 7 of 16 Revision 1

. \:

LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONS3 NOT OBTAINED C AUT40N: A faulted or ruptured S/G that is isolated saould remam isolated. Steam supply to the Turbine-driven AFW Pump must be maintained from one S/G i

9 Check S/G Press IF S/G press low and decreasing in an

a. Press in all S/Gs within uncontrolled manner, 100 psi of each other THEN isolate faulted S/G:
b. All S/G press - STABLE Isolate AFW flow OR INCREASING Ensure Turbine-driven AFW Pump being supplied from intact S/G Ensure S/G PORV closed

!O Check Secondary Side IF secondary side radiation Radiation - NOTIMAL - Is high, TIIEN isolate ruptured S/G:

a. Dispatch Rad Con to monitor secondary plant Isolate AFW flow Ensure Turbine-driven AFW Pump being supplied from intact S/G WHEN S/G press

< 1040 psig, THEN verify S/G PORV closed EMERGP/A -7 ilac

i SQNP ECA-0.0 Unit 1 or 2 Page 8 of 16 Revision 1 1

LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED  ;

11 Check Intact S/G Levels

a. Narrow range S/G a. Verify AFW flow and levels > 25% S/G 1evels returning to normal program
b. Control S/G levels b. IF any S/G level between 25% and 50% continues to increase with no AFW tiow, THEN isolate ruptured S/G:

Isolate AFW flow Ensure Turbine-driven AFW Pump being supplied from

.. intact S/G WHEN S/G press

< 1010 psig, THEN verify S/C PORV closed I

1 i

EMERGP/A -H-JitC

SQNP EC A-0,0 Unit 1 or J Page 9 of 16 i' e - Revision 1

i.

LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Check DC Bus Loads

a. Notify TSC to evaluate shedding all large non-essential DC loads
b. Monitor. DC power supply
1) '125-V DC vital batteries
2) 250-V DC batteries
c. Evaluate use of fifth vital battery 13 Check CST Level .
a. CST _ level > 3 ft a. !F CST level < 3 f t.

THEN open ERCW valves to Turbine-driven AFW Pump suction and monitor pump suction press

b. CST level > 17 ft

" b. IF CST level < 17 ft, TiiEN attempt to refill

~

CST while continuing with this instruction e Notify TSC to evaluate alternate means of supplying AFW suction i

j E31EltGl'/A aac

4 SQNP EC A-0.0 Unit I or 2 Page 10 of 16

/

Revision I ils LOSS OF ALL AC POWER l

STEP' i ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAl'!ED l l

l CAUTION: RCS pressure should not be decreased to less than 180 psig to prevent nitrogen injection from cold leg accumulators 1

Note: RCS cooldown and depressurization should be as quickly as }

possible to minimize RCS inventory loss out RCP seals {

j i

Note: {

Pzr level may be lost and reactor vessel upper head voiding may occur due to depressurization of S/Gs. Depressurization {

j should not be stopped to prevent these occurrences q

'ote:

S/Gs I and 4 PORVs have reach rods in 180-V SD Bd :icem 14 Cooldown RCS ..

a. Maintain intact S/G level i.  !!ecover level in at

> 10% (25% FOR ADVERSE least one intact 3/G CNTMTl in S/Gs used for prior to cooldown cooldown

b. Maintain T-cold > 270 F
c. Rapidly dump steam using S/G PORVs
1) Dispatch operator with radio to S. G PORVs 1
2) Normal 100"F/hr cooldown limit not required
d. Control S/G l'ORVs to maintain RCS press

> 180 psig I

ENER GI" A aae l

l l

______________J

SQNP EC A-0.0 Unit 1 or 2 Page 11 of 16 Revision 1

.A LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE l RESPONSE NOT OBTAINED 1 15 During RCS Cooldown, Allow 1 Accumulators To inject .)

i l

a. UHI i
1) Injection starts at

~ 1200 psig-

2) AFTER UHI injection, ensure UHI isolation valves closed
3) Locally gag isolation valves
b. Cold leg accumulators
1) Injection starts at

~400 psig ~

l

2) ~ Maintain RCS press

> 180 psig to prevent nitrogen injection 16 Check Reactor Suberitical IF reactor returning critical,

a. Intermediate range - TllEN evaluate tf reactor can be shutdown by injecting ZERO OR NEGATIVE accumulators or stopping RCS STARTUP RATE couldcwn
b. Source range -

ZERO OR NEGATIVE STARTUP HATE ENEllGP ' A aue

SQNP ECA-0.0 Unit 1 or 2 Page 12 of 16

_.- Revision 1

(-

A LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 17 Actuate Phase A And Cntmt V

' ent Isolation

a. Manually actuate phase A and entmt vent isolation
b. IF SI actuated, TIIEN reset SI after 1 min l time delay )

18 Check Phase A And Cntmt Vent Isolation i

a. Refer to SOI-88.1 A and  !

I SOI-88.1B

b. Notify TSC 'to evaluate any . . .

isolation valve which failed to clos _e ENERGl'/A aac

SQNP ECA-0.0 Unit 1 or 2 Page 13 of 16 Revision 1 t

A LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE .'iOT 03TAINED 19 Check Cntmt Hydrogen Control Equipment -

a. Place hydrogen ignitors to off
b. Place hydrogen recombiners in standby with power out switch to off ,

i 20 Check Cntmt Press < 2.31 nsig IF cntmt press > 2.31 psig ,

TIIEN :

l

a. Check phase B isolation per 501-58.1C

' b. Notifv TSC *.o evaluate any isolation valve which faile,t to close

c. Reset cntat spray DIEltGP,A

-13 n;\c

SQNP EC A-0.0 Unit I or 2 Page L4 of 16 Revision 1 LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE ItESPONSE NOT GBTAINED l

21 Check If AC Power Restored l

3 a. IF both shutdown boards a. IF at least one shutdown l 7011 de-energized, Toard energized.

, rIEN repeat steps 13 TIIEN continue with next to 21 while checking s tep status of following:

1) AC power restoration l

l

2) RCP seal isolation
3) DC power supply
4) SIT temp .> 145 F or evaluate diluting BIT i i
5) B AT temp > 145 F or ,

l evaluate diluting B AT

6) SFP' level above bottom rung on local level indicator on the west wall 22 Stabilize S/G Press DIERGP/A - 1 1-aac

_ _ _ _ _ _ _ _ . _ _ _ _ _ _ . -- - - - - - - - - - - - - - - - - - - - - - - - - - --------- --------~ ----- -- --~ -- -

SQNP EC A-0. 0 Unit .I or J Page 15 of 16

/ Revision 1 f

1 A-LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED C AUTION: The loads placed on the energized AC board should not exceed the capacity of the power supply 23 Verify Following Equipment Energized On Shutdown Board

a. 480-V shutdown boards L. 125-V vital battery charger e 120-V AC vital inst power bds
d. Standby lighting
e. 250-V DC battery charger
f. 48-V DC telephone charger ~
g. 24-V DC microwave charger 21 Verify ERCW Operation
a. Verify ERCW Pump -

RUNNING

h. Verify ERCW to D/G EMEllGP/A .litC

SQNP ECA-0.0 Unit 1 or 2 Page 16 of 16 Revision 1

, LOSS OF ALL AC POWER STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAISED 25 Select Recovery Guideline

a. IF the following a. IF either of the two E6nditions are met: Eriteria are NOT

" satisfied ,

1.) RCS subcooling THEN go to

  • ECA-0.2,
> 40 F RnCOVERY FROM LOSS OF ALL AC POWER
2) Pzr level ,> 20% WITH . SI . REQUIRED

[50% FOR ADVERSE CNTMT]

THEN go to ECA-0.1, Recovery From Loss Of All AC Power Without SI Required

~

-END-DIERGP/A aae

________________-___-____

Retrieved from "https://kanterella.com/w/index.php?title=ML20237J043&oldid=3112917"