Moisture separator reheaters Flashcards
(22 cards)
What is the purpose of the Moisture Separator Reheaters (MSR)?
Increase the mechanical efficiency of the plant AND Minimize erosion damage to the low-pressure turbines.
Summarize the MSRs function.
The MSRs function is to reduce the amount of moisture in the steam flowing through the Low Pressure (LP) turbines.
Describe the function and location of the steam supply valves (MSS-MOV50A/B)
isolate steam from the main steam header to the reheaters. The reheater steam supply valves are located on the North end of the 38’6” level of the Turbine Building.
What happens to the Reheater Steam Supply Valves on a Loss of Power?
They Fail As-Is
Describe the function and location of the Steam load control valves (MSS-PDV36A/B AND PDV37A/B)
Reheater steam supply pressure is throttled by a set of control valves to maintain a programmed steam supply pressure
Located TB 66’6” by each MSR
PV36 is a 16” valve
PV37 is a 4” valve
Describe the function and location of the Moisture separator drain tanks (DSM-TK1A/B)
collect condensed reheat steam
Describe the function and location of the Moisture separator drain pumps (DSM-P1A/B)
take a suction from the two moisture separator drain tanks and supply water to the suction of the Main Feedwater Pumps
The two pumps are located below their associated moisture separator drain tanks on the North end of the 14’6” level of the Turbine Building
Describe the function and location of the Moisture separator drain pump minimum flow recirc valves (DSM-FV35A/B)
During low flow conditions when the Normal Level Control Valve is fully or mostly closed, the self-actuating recirculation valve will open to ensure a minimum pump flow of 500 gpm is returned back to the respective moisture separator drain tank. This prevents the moisture separator drain pumps from overheating.
These valves are located on the pump discharge line between the pump and the Normal Level Control Valve
Describe the function and location of the Moisture separator drain tank normal level control valves (DSM-LV20A1/B1)
maintain ~50% level in the moisture separator drain tank
located on the discharge side of the DSM pumps (Turbine Building 38’6”)
Describe the function and location of the Moisture separator drain tank emergency level control valves (DSM-LV20A2/B2). What are they also known as?
dump inventory from the tanks via a 20” diameter pipe directly to the condenser
Emergency Level Control Valves (ELCVs)
Describe the function and location of the Moisture separator drain tank pocket drain valves (DSM-MOV32A/B)
provided to drain the shell sides of the MSRs directly to the condenser during turbine startup and shutdown.
located under the South end of each MSR on the 66’6” level of the Turbine Building
Describe the function and location of the Moisture separator reheater drain tanks (DSR- TK1A/B)
Condensed reheat steam from each MSR tube bundle is drained to its dedicated 2900 gal. Reheater Drain (DSR) Tank
located on the north end of the 38’6” level of the Turbine Building
Describe the function and location of the Moisture separator reheater drain tank normal level control valves (DSR-LV20A2/A3/A4 & LV20B2/B3/B4)
automatically throttle flow to the shell sides of the three First Point Feedwater Heaters
Describe the function and location of the Moisture separator reheater drain tank emergency level control valves (DSR-LV20A1/B1), a.k.a. High Level Drain Valves (HLDVs)
dump inventory from the tanks directly to the condenser during startup and when power is 50%, or when DSR tank high level conditions exits.
located by the north end of the condenser (TB 38’6”)
Describe the function and location of the 1st point feed water heater scavenging steam supply valves (DSR-MOV31A/B/C)
A vent line attached to each reheater drain tank directs any steam from the tank to the shell sides of the first point feed heaters
located on the 38’6” Turbine Building
Describe the function and location of the Moisture separator reheater drain tank condenser vent valves (DSR-MOV29A/B)
To ensure scavenging steam is lined up to the reheaters at low power levels, each reheater drain tank has a backup path venting to the condenser via a Condenser Scavenging Steam Valve
Describe the operation of Steam load control valves
Describe the operation of Moisture separator drain pump minimum flow recirc valves
Describe the operation of Moisture separator drain tank normal level control valves
Describe the operation of Moisture separator drain tank emergency level control valves
Describe the operation of Moisture separator reheater drain tank normal level control valves
Describe the operation of Moisture separator reheater drain tank emergency level control valves
