Extraction Steam and HD Alarms

Question 1

EK-0165 “REHEATER DRAIN TANKS T-4A & T‑4B HI LEVEL”

Answer 1

EK-0165 “REHEATER DRAIN TANKS T-4A & T‑4B HI LEVEL”

Sensor:

• LS-0538, Reheater Drain Tank T-4A Level Control
• LS-0555, Reheater Drain Tank T-4B Level Switch

Trip Setpoints:

• 35 ½ inches from bottom

Alternate Indication:

• Local level indications
• For the affected Reheater Drain Tank, check High Level Dump Valve CV‑0539 or CV‑0555 open. (PPC Indication only)

Question 2

EK-0168 “FEEDWATER HEATERS HI LEVEL”

Answer 2

EK-0168 “FEEDWATER HEATERS HI LEVEL”

• Heater 6 - 16” from bottom of heater
• Heater 5 - 21” from bottom of heater
• Heater 4A -10.5” from bottom of heater
• Heater 4B - 9.5” from bottom of heater
• Heater 3 - 11” from bottom of heater
• Heater 2 - 10” from bottom of heater
• Heater 1A - 11” from bottom of heater
• Heater 1B - 9” from bottom of heater

Check heater high level lights on C‑11 to determine affected heater. IF alarm does not immediately clear, THEN check High Level Dump Valve opening by observing lights on C‑01.

Question 3

EK-0170 “HEATER DRAIN PUMPS TRIP”

Answer 3

EK-0170 “HEATER DRAIN PUMPS TRIP”

Breaker open (green light) with control switch in “After Start” position

“After Start” position is RED target flag showing above switch.

Control Room indications that can be used to validate:

• Control switch breaker indicating lights.
• Control Switch target flag
• T-5 level

Question 4

EK-0172 “MOIST SEP DRAIN TANK HI-LO LEVEL

Answer 4

EK-0172 “MOIST SEP DRAIN TANK HI-LO LEVEL

Sensor:

LS-614A
LS-0614B

Trip Setpoints:
High: 80.65%
Low: 50%

Alternate Indication:
Control Room level indications

• P-10A, Heater Drain Pump, is tripped by LS-0608-K1 at LS-0629-K1 at 12.8%
• P-10B, Heater Drain Pump, is tripped by LS-0608-K2 and LS-0629-K2 at 22.5%
• CV-0609, Moisture Sep Drn Tk T-5 Dump to Condenser, opens at 83.06%
• Loss of EY-01 (LS-0608 and LS-0609) will not trip P-10A or P-10B.