Turbine

Question 1

Turbine Trips -

Answer 1

(MEMBERTORCHMEOE)
Manual - 2 PB’s MCR/Frnt Stnd
EHC - <1100 pasig
MSR Level Hi - 3(2.5)”
Bearing header pressure low - <21 pasig
Electrical Fault - Main Generator / Transformer / UAT
Runback (>6,466) - <20,232 in 2 min and then <6,466 in 3.5 min
Thrust - <35mil
Overspeed - Pri - 1980 / Emer - 1989 -
RWL Hi - 54(54.5)”
Condenser Vac Low - 22.3” Hg Vac
Hi Vibration - 12mil (X&Y)
MSOP - <105psig
Exhaust Temp Hi - 225degF
Offline ETD
Excessive Acc / Dec Trip

Question 2

Turbine Lube Oil Auto Starts

Answer 2

Main Suction Pump - (<90% Speed) - Oil Booster Press <20psig
ESOP - MSOP < 190psig & TGOP < 27psig
                TGOP Loss of AC
Lift Pump - Brg hdr >6psig (TRIPS @ 0psig)
                       500# Lift
                       25# ESOP or TGOP
TGM - 0-1.5 rpm
              U1 - 0 RPM
              U2 - TGOP <20# (Armed)
TGOP - MSOP <200psig
                Brg hdr < 25/15psig

Question 3

TCV Opening Arrangement

Answer 3

Modified partial arc. 1, 2, 3 open together. When they are @ 64%, #4 starts to open. (This is about 90% power)
#4 valve is clamped at 97% control ref. This is 40(59) % full open

Question 4

When Turbine becomes self-sealing

Answer 4

> 30%

Question 5

Shell Warming

Answer 5

ONLY TSV 2 cracked open, TCVs Open, CIVs Closed HUR must be kept below 150F/hr on 1st stage shell inner temp.
Bring pressure up to 60 to 75 psig
Chest inner to outer dT kept below attachment 3
Time to hold shell warming dictated in attachment 1

Question 6

Vibration Limits

Answer 6

• If <800rpm the max allowed is 8mils
• Between 800 and 1400rpm the vibration limit for
  any bearing is 10mils for 2 minutes and max
  vibration is 14mils
• At speeds >1400 rpm the vibration limit for any
  bearing is 12mils

Question 7

Chest Warming

Answer 7

ONLY TSV 2 cracked open, TCV closed, ISV Open
1st stage inner temp must be >250 F
Done until chest is 500F with <75F delta temp between inside and outside

Question 8

Turbine Lube Oil Power Supplies

Answer 8

Motor Suction Pump – 600V “C”
Lift Pumps – 2R24-S005 from 600V “B”(1R24-S005 from 600 “AA”)
Emergency Bearing Oil Pump – R22-S018 from R22-S016 (R22-S016)
Turning Gear Oil Pump – 600V C
Turning Gear – 600V C – Alternate power from 600AA

Question 9

Arm lift pumps

Answer 9

Must be reset after a loss of power or trip. Reset in Main turbine enclosure at 164’ elevation