ML20237H517
| ML20237H517 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/13/1987 |
| From: | Strickland G, Terpstra G TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20237H133 | List:
|
| References | |
| AOI-35, NUDOCS 8708170249 | |
| Download: ML20237H517 (19) | |
Text
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- i i1 . TENNESSEE VALLEY AUTHORITY l
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' e SEQUOYAH NUCLEAR PLANT ..
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ABNORMAL OPERATING INSTRUCTION A0I-3S i -LOSS OF OFFSITE POWER Units 1 and 2 <
, Revision 8 PREPARED BY: George Strickland RESP 0'NSIBLE SECTION: OPS REVISED BY: _ G. L. TERPSsTRA APPROVED BY: .i ~
.(A <
esponsible Sec ion pervisor APPROVED BY: 4 Plant Manager DATE APPROVED: AY l 31987
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Reason for revision (include all Instruction Change Form Nos.):
General reformat: remove inconsistency between AOI-3S & emergency instructions (referenced E0P for natural circ / handling Rx): revised Appendix C list of D/G loads to be consistent with B43870127906; added
, a Appendix B per ECTG 243.00: Energized Rx vent Bd to establish power to H,__
.recombiners/ analyzers: and revised Appendix A CS pump sequencing 180 sec.
& EBR 220 sec. (phase B only) per WP'12279/12227. This constitutes a
} biennial review.
- The last page of this instruction is number:_' 17 I mes
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b SEQUOYAH NUCLEAR, PLANT PLANT INSTRUCTION REVISION LOG
' Abnormal Operating Instruction AOI-35 l REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS) 0- 03/30/83 All 1 07/31/84 13 1, 8-10, .
2 10/04/84 12, 18 3 01/04/8_5 13 1, 2, 5, 4 06/17/85 6, 13, 15
< Revised per NCR SQN MEB 8413 to add caution concerning loss of offsite power, and update steps for manually operating the S/G PORVs in the event 5- 01/06/86 5,8,9 they are inoperable.
Revised per INPO SER 85-25. Also,
_. revised page headings to comply with 6 06/11/86 All AI-4 heading requirements.
Revised to delete reference to SI-48, correct typographical errors and to-7 10/22/86 1,9 correct undervoltage setpoints. -
General reformat; remove inconsistency .I between A0I-35 & emergency instructions (referenced E0P for natural circ / handling Rx); revised Appendix C ,
list of D/G loads to be consis' tent with !
B43870127906; added Appendix B per ECTG 243.00; Energized Rx vent Bd to
._ establish power to Hr recombiners/
analyzers; and revised Appendix A CS
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pump sequencing 180 sec. & EBR 220 sec.
MAY 131997 (phase B only) per WP 12279/12227.
8 ALL This constitutes a biennial review. __
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Revision 8 *
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, LOSS OF OFFSITE POWER l'
I". PURPOSE The purpose of this instruction.is'to provide operator action for a loss of offsite power. Since loss of..offsite power will cause a reactor trip, emergency instructions should be used to handle the event. This instruction will only handle the electrical portion (e.g., monitoring D/Gs, loading additional equipment on D/Gs and restoring offsite power) of loss of offsite power.
-I I . SYMPTOMS A. Possible Alarms
- 1. .6900V UNIT BD A (B, C, or D) FAILURE OR UNDERVOLTAGE
.. 4. 480V SD BD Al-A (A2-A, B1-B, B2-B) FAILURE OR UNDERVOLTAGE
.B. Possible Indications
- 1. Normal CR lights off and emergency lights on
- 2. Loss of loads connected to the 6.9 kV and 480V unit and shutdown bds
- 3. RCPs. trip
.4. D/G start l
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L 5. Reactor trip !
III. -AUTOMATIC ACTION A. Reactor-Turbine trip j B. All D/Gs start and energize 6.9 kV SD bds that lost voltage l L C. Blackout sequence initiated (See Appendix A for list of !*
equipment sequenced on) 4 6
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Revision 8 -
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LOSS OF OFFSITE POWER IV. IMMEDIATE OPERATOR ACTION None V. SUBSEQUENT OPERATOR ACTIONS NOTE: If a reactor trip or safety injection occurs during use of this instruction then go to E-0, " Reactor Trip or Safety Injection." .
i CAUTION: Due to the possibility of combustibles accumulating in the l diesel exhausts and superchargers during long term light load operation, place sufficient equipment in service to I
.obtain > 1600kW within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after the blackout. The 1600kW should be held a minimum of 30 minutes to clear the engine of combustibles.
A. Ensure D/G loading as follows:
- 3. IF D/G is overloaded (4000 kW longterm, 4400 kW for 2 hr.)
(Refer to Appendix B THEN remove some unnecessary loads.
for some loads to evaluate.)
- 4. Send AU0 to D/G Bldg to monitor D/Gs. j
~ 1 NOTE: Equipment started by blackout will not stop until B0 )
is reset. IF required to stop equipment THEN place i control switch in PULL-to-LOCK position. I
- 5. Verify equipment in Appendix A operating.
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LOSS OF OFFSITE POWER r
-1 V .' SUBSEQUENT OPERATOR ACTIONS (continued)
CAUTION: 'If one diesel' trips its companion tiain diesel could lack sufficient cooling water. IF sufficient additional ERCW is available on the other train, THEN the opposite train cooling water valve can be opened.
B. Verify ERCH to D/Gs. .
C. Activate REP per IP-1.(electrical: AC problem).
D. L'ocally start. control air compressors A and B.
E. . Check'for cause of loss of offsite power.
- 1. ' Check for relay targets in relay room to determine the fault location.
- 2. Make inspection of 161kV switchyard, 500kV switchyard and transformer yard.
- 3. Notify load' dispatcher of condition of relay, switchyard and transformer yard.
NOTE: Turbine turning gear is not available during blackout.
F. Check Turbine Operation
- 1. Check for normal generator H, pressure.
- 2. Verify DC bearing oil pump running.
- 3. Break vacuum on condenser.
- 4. IF hotwell level is increasing, THEN close or isolate LCV-2-9, vacuum drag to hotwell (fails open on loss of air).
Locally ensure DC air side seal oil pump - RUNNING
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- 6. WHEN condenser vacuum is zero, THEN isolate gland seal steam.
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LOSS OF OFFSITE POWER i
V'. SUBSEQUENT OPERATOR ACTIONS (Continued)
NOTE: WHEN starting' additional equipment on D/G, THEN ensure total' loadiis maintained 5 4000 KW long-term or 5 4400kW for 2 hr.
G. Energize Rx Vent Bd
_1 . Open all breakers feeding 0FF Rx Vent bd.
- 2. ' Energize Rx Vent Bd.
= IB-B from 480V SD Bd 181-B
- 3. Energize H2 Recombiner and Analyzer.
CAUTION: IF a Phase B occurs after following equipment is loaded, THEN verify it is tripped from shutdown bd.
- 4. If a Phase B is WOT present THEN energize following equipment; a) Energize upper compartment cooling fans.
, b) Energize waste gas compressor from non-SI units 0/G
. either lAl-1 or 2Al-1 Rx Vent Bd.
c) Start upper compartment cooling fans as necessary per 501-30.3.
d) Start waste gas compressor as necessary per S0I-77.2A.
- H. Check vent radiation monitors in operation, u
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Revision 8 :- .
LOSS OF OFFSITE POWER -
Vc SUBSEQUENT OPERATOR ACTIONS (Continued)
I. Verify. heat tracing heaters are on by the absence of alarm:
Safety injection system A or B heat tracing failure.
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2, Boric acid Tank A, B or C temperature high-low.
- 3. Batching tank temperature high-low. ,
J. IF A. train power available, THEN place spent fuel pit cooling system in service.per 501-78.1.
K. IF A. train power NOT available, THEN within 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> align SFPCS to B train CCS per A01-15E, " Loss of Component Cooling Water".
L. The ERCW traveling screens should be checked and started.
manually as.needed.
i M. IF additional equipment is needed for stable conditions, THEN ;
. refer-to Appendix C for effect on D/G loading.
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LOSS OF OFFSITE P0fER VV. RECOVERY A. After trouble has been corrected or isolated, reset 161-kV switchyard relays and targets that were tripped.
B. Energize 161-kV busses as per system load dispatcher or switchyard. operation letter, Instruction of Total or Partial System Interruption,-SWYD 15.
C. Verify all 6.9kV common and unit boards' normal and alternate j supply breakers open, then energize common transformer A and C per system load dispatcher or Emergency Procedure for Switchyard ,
Operation.
D. Energize 6900V start bus A and B'(501-202.1).
E. Energize 6900V and 480V unit station service system (50I-202.3 &
201.1).
NOTE: Allow approximately 10 minutes between starting each RCP to ensure pump parameters have stabilized.
F. Start one RCP (#2 or #1) as required per 501-68.2.
G. Verify the following pumps are running:
- 1. Seal oil backup pump
- 2. Air side seal oil pump
- 3. Hz side seal oil pump
_ 4. Bearing lift pump
H. Place turbine on turning gear or set up shaft rotation. !
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LOSS OF OFFSITE POWER-VIf RECOVERY.(continued)
, CAUTION: Equipment started by blackout will not stop until blackout is reset. If required to stop equipment then." Pull-to-Lock" control switch.
NOTE: The appropriate 501-82 section L should be used for recovery LI if the D/G did not tie on the SD Bd.
I. Transfer 6.9kV SD boards from D/G back to 6.9kV unit boards.
NOTE: The SI signal should be reset before removing D/Gs from service. j I 1. In'SD board logic cabinet for each SD board:
- a. Place all.43 T(L) switches to TEST position as each switch is placed to TEST position, verify left white light 'out' and center white light 'on'. .If center white light fails to light K609, safety injection slave relay could have failed to reset.
- b. Verify all of the four cabinets' amber lights come on after the last 43 T(L) switch is.placed in the TEST position. (If amber light is not on, the emergency start. signal is not reset.)
- c. THEN Return all 43 T(L) switches to normal.
- d. Dispatch operator to D/G building.
NOTE: Voltage and frequency may change when 86 LOR is reset.
- NOTE Have AU0 verify red light off for an emergency start signal (located adjacent to 86 LOR switch),
- e. Reset 86 lockout relay on D/G relay panel for:
(1) D/G 1A-A (2) D/G 18-B (3) D/G 2A-A (4) D/G 2B-B
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Page 8 Revision 8
- LOSS OF OFFSITE POWER VI./ ' RECOVERY (continued)-
NOTE: This previousLaction allows D/G frequency and voltage.
control.
NOTE: Shutdown D/Gs one at a time.
- 2. Change the appropriate D/G to parallel position with Unit / Parallel switch on panel 0-M-26. -
l .' NOTE: Return 6.9kV SD bds to normal supply unless abnormal conditions exist.
- 3. Verify the appropriate 6.9kV Unit Bd ACBs closed by lights on 0-M-26.:
- 4. Turn the appropriate'D/G synchronize switch to ON position ~
I for one D/G at a time:
- a. 1-HS-57-45 for normal supply or 1-HS-57-42 for alternate
_ supply.
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- b. 1-HS-57-69 for normal supply or 1-HS-57-72 for alternate supply.
- c. 2-HS-57-45 for normal supply or 2-HS-57-42 for alternate supply.
- d. 2-HS-57-69 for normal supply or 2-HS-57-72 for alternate supply.
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Page 9 Revision 8 0 .
LOSS OF OFFSITE POWER VI7 RECOVERY (continued)
.. c 5. Adjust the appropriate D/G voltage to match unit board:
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- a. HS-82-12 in pull for P-Auto position.
- b. HS-82-42 in pull for P-Auto position.
- c. HS-82-72 in' pull for P-Auto position. .
- d. HS-82-102 in pull for P-Auto position.
- 6. Adjust the appropriate D/G speed until scope is' rotating
-clockwise slowly.
, 7. WHEN scope approaches 12:00 (one D/G at a time), THEN place the appropriate D/G.
- a. 1-HS-57-44B to CLOSE position for normal supply or 1-HS-57-41B to CLOSE position for alternate supply,
- b. 1-HS-57-68B to CLOSE position for normal supply or 1-HS-57-71B to CLOSE position for alternate supply,
- c. 2-HS-57-44B to CLOSE position for normal supply or .
l2-HS-57-41B to CLOSE position for alternate supply,
- d. 2-HS-57-68B to CLOSE position for normal supply or 2-HS-57-71B to CLOSE position for al, ternate' supply.
NOTE: Check for parallel loading of D/G 0748H/ SAT /csw
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Revision B :
LOSS OF OFFSITE POWER l'
VI.' RECOVERY (continued)
CAUTION: .Any diesel that has b'een loaded less than 40% for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> must be loaded per step Q of this procedure, before unloading.
l 8. Remove the appropriate load from one D/G:
- a. Turn'D/G 1A-A speed HS-82-13 to decrease until D/G load is.zero, then turn 1-HS-57-46A to TRIP position.
- b. Turn D/G 1B-8 speed HS-82-43 to decrease'until D/G load ,
is zero, then turn 1-HS-57-73A to TRIP position. l s
- c. Turn D/G 2A-A. speed HS-82-73 to decrease until D/G load 'l 1s zero, then turn 2-HS-57-46A to TRIP position. !
____d. Turn D/G 2B-B speed HS-82-103 to decrease until D/G load is zero, then turn 2-HS-57-73A to TRIP position.
- 9. Reset the appropriate blackout relays with reset pushbutton on 6.9 kV shutdown board logic panels
- a. lA-A
- b. 18-B .
- c. 2A-A ,
- d. 2B-B
- NOTE: Stop D/G by running the appropriate S01-82 section L.
J. Energize 6900V.and 480V common station service systems (50I-202.2 & 201.1).
K Place condenser circulating water system in service (501-27.1).
'r L. Place raw cooling water system in service (50I-24.1).
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Revision 8 : ..
LOSS OF OFFSITE POWER
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.VI.' RECOVERY (continued)'
t M. Energize the following electrical boards: j
- l. Control and' auxiliary building vent boards:
- a. lA2-A
- b. IB2-B _
- c. 2A2-A
- d. 2B2-B
- 2. ' Reactor vent boards.& power equipment off board
- a. lA-A
- b. 18-8
- c. 2A-A
'd; 28-B
- a. lA-A
- b. 18-B
- c. 2A-A
_ d. 2B-B
- 4. Reset local alarms on vital inverters:
- a. 1-1 and 2-I
- b. 1-II and 2-II
- c. 1-III and 2-III
- d. 1-IVand2IV 0748H/ SAT /csw
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LOSS OF OFFSITE POWER VI/ RECOVERY (continued)
- 5. Reset the targets on all under voltage relays in the following 6.9 kV logic panels:
- a. 1A-A
.- b. 2A-A
- c. 18-B
O. Seal main turbine.
P. Pull vacuum on main condenser.
Q. Purge the D/G engine of any combustible accumulated during light load operation using the following instructions:
- 1. Following light load operation of less then 1600 kW for up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> the engine should be loaded to 1600kW by connecting to its SD board and observe the exhaust sta' for
.l' smoke. Note that this will require stationing someone at
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the diesel building.
- 2. Observe the stack for smoke while gradua'lly increasing load. If the stack exhaust becomes twice as dense as normal, stop the load increase unt'il it cleans, then
- commence gradual load increase observing for further stack density.
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- 3. Continue this process until 4000kW is attained with a clean stack. ;
NOTE: GOI-3 should be followed to cooldorn with, if cooldown is desired.
R. Unit will be placed in service following operating procedure after administrative decisions have been made.
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APPENDIX A -
Page 1 of 1 D/G Load Sequentially Applied Following a Loss of Offsite Power TIME IN l EQUIPMENT NAME LOADEO SECONDS )
Miscellaneous loads 80 or SI with 80 0
CCP B0 or SI with B0 2 SI Pump SI with B0 only 5 RHR Pump SI with 80 only 10 e
ERCW Pump B0 or SI-with 80 15 CCS & booster Pumps 80 or SI with B0 20 AFW B0 or SI with B0 25
- Pzr Heaters (A-A & B-B only) 80 only 90 HPFP BO or SI with BO 120
Containment Spray (CS)- Phase B with B0 180 Electric Bd Rom HVAC Phase B with 80 220
D/G Rating: 4000KW continuous or 4400KW for 2 hrs. in 24-hr. period.
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Time is measured from the time of closing of the breaker connecting the D/G to the power train.
If fire pump start signal present.
No time delay if Phase B not present.
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APPENDIX B Page 1 of 2 D/G Loads Which Should Be Evaluated to Be Removed If D/Gs are Overloaded
Electrical Load 480V Board Compartment 1
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D/G 1A-A Boric Acid Tank A Htr A-A Reactor MOV Bd 1Al-A 1.4C BA Batching Tank Htr 2 Reactor MOV Bd 1Al-A 148
-[ Primary Water Makeup Pump 1A C&A Vent Bd 1Al-A 8A
-( Diesel Aux Bd 1Al-A El 722 Corridor Htr SE DG Bldg Lighting Cabinet LC45 Diesel Aux Bd 1Al-A SA1 Boric Acid Tank C Htr A-A Reactor MOV bd 1Al-A 14E i f
D/G 1B-B Boric Acid Tank A Htr B-B Reactor MOV Bd 181-B 3E BA Batching Tank Htr 1 Reactor MOV Bd 181-B- 4C
- r. Primary Water Makeuo Pump 1B C&A Vent Bd 181-B 8A Spent Fuel Pool Cooling Pump C-S (Alt.) Shutdown Bd 182-B 8A El 722 Corridor Htr Diesel Aux Bd 181-B SE DG Bldg Lighting Cabinet LC47 Diesel Aux Bd 1BI-B sal Boric Acid Tank C Htr B-B Reactor MOV Bd 181-B 4E D/G 2A-A CVCS Heat Tracing Shutdown Bd 2Al-A 8C Boric Acid Tank B Htr A-A Reactor MOV Bd 2Al-A 140 BA Batching Tank Htr 4 Reactor MOV Bd 2Al-A 14C Primary Hater Makeup Pump 2A C&A Vent Bd 2Al-A 8A Spent Fuel Pool Cooling Pump C-S (Nor.) Shutdown Bd 2Al-A 8A
. El -722 Corridor Htr Diesel Aux Bd 2Al-A SE Standby Lighting Cabinet No. LS-1 Shutdown Bd 2A2-A 9C
- DG Bldg Lighting Cabinet LC46 Diesel Aux Bd 2Al-A SA1 CVCS Heat Tracing Shutdown Bd 2A2-A 8C D/G 28-8 CVCS Heat Tracing Shutdown Bd 281-B 8C Boric Acid Tank B Htr B-B Reactor MOV Bd 2B1-B 4E
.BA Batching Tank Htr 3 Reactor MOV Bd 281-B 4C Primary Water Makeup Pump 2B C&A Vent Bd 2B1-B 8A El 722 Corridor Htr Diesel Aux Bd 2B1-B SE Standby Lighting Cabinet No. LS-3 Shutdown 2B1-B 80 DG Bldg Lighcing Cabinet LC48 Diesel Aux Bd 2B1-B 5A1 CVCS Heat Tracing Shutdown Bd 282-B 8C ,
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i F APPENDIX B R Page 2 of 2
,' D/G Lo:ds Which Should Be Evaluated to Be Re.aaved If D/Gs are Overloaded
Source of Information--Diesel Generator Load' Analysis, SQN-E3-002R3 (B43.861003 904)
"' - -' ' ' - D/Gscouldpossiblybeoverloadedforcontinuousrating(4000kwiin l.. combination of loss e ' offsite power, safety injection, Phase B containment isolation and loss of one power train.
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. APPENDIX C Loss of Offsite Power - DG Loads f
Page 1 of 2 The following loads are fed from the DGs. Ensure equipment operating or start as necessary to establish preblackout conditions.
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NOTE: Watch total loads closely. (Major load demands listed adjacent to
. item.)
E001PMENT RUNNING KW
- 1. CCP- 477 kW each 1
'f 2. SI 319 kW each
- 3. RHR 318 kW each
- 4. Pzr Hts 415-485 kW each ;
- 5. HPFP 167 kW each
-l 8. CCS Booster Pumps 13 kW each
- 9. Cntmt Spray Pumps 550 kW each
, 10. MCR A/C Condensing Unit 104 kW each l 11. EBR A/C AHU 61 kW each l
f- 12; Aux Air Compressor 18 kW each
- 13. Cntmt Air Return Fans 39 kW each l 14. RHR Pump room cooler I. 15. Vent Radiation Monitors
- 16. SFP Cooling Pump 82 kW each l 17. 125V Vital Battery Chargers 206 kW each
- [' 18. Emergency lighting cabinet
- 19. Fuel Handling Exh Fan 82 kW eac.h
- 20. SD Bd room A/C chiller 200 kW each
- 23. Radiation monitor & sampling
- 24. CCP Room cooler
- 26. Cntmt Spray Pump Room cooler
- 27. Pipe Chase Cooler ,
- 28. Pene rm el 669, 690, & 714 c1rs i
- 29. AFW Pumps 418 kW each ;
- 30. Shutdown transformer exh fans i
- 31. Control building cleanup fans i
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l APPENDIX C
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i Loss of Offsite Power - DG Load
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EQUIPMENT RUNNING KW
- 32. El 749 board rm press supply fans
- 33. El 749 board room AHUs
- 34. El 749 board rm condenser units 14 kW each 1.: 35. El 749 board rm compressors 42 kW each
- 36. Cont Bldg batt exh fans _
- 37. EGTS fans and heaters 33 kW each
- 38. ABGTS fans and heaters
- 39. EGTS room cooler '
- 41. SD Bd room A/C~ pressure fan I. 42. Station air compressor 103 kW each
- 43. Control Bldg Press fans
- 44. SO Bd room A/C CW pump
- 45. ERCW strainer
'I. 46. Hz Recombiners 75 kW each
- 47. BA Transfer Pumps
- 48. BAT heaters 49; Motor Operated Valves
- 50. CCPs Auxiliary oil pump
- 51. 24V microwave battery charger
- 52. DG starting air compressors
- 53. DG battery board exhaust fan
- 56. DG bldg lighting cabinet 40 kW each
- 57. 125V battery charger (DG batt)
- 58. DG day tank fuel transfer pmp
- 1. 59. ERCH fans and heaters 40 kW each
- 60. ERCW trav screens & wash pmps 37 kW each
( 61.
62.
SFP Pumps area cooler DG bldg electric heat
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- 63. H, Ignitors 26 kW each
- 64. Primary Water Pump 17 kW each 0748H/ SAT /csw l
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