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Systems > Aux. Steam > Flashcards

Aux. Steam Flashcards

1
Q

Where is Aux Steam supplied to?

A

Supplied to:
-Gas Stripper for degasification
-LRS for Water reclamation
-BAC Boron Reclamation
-MSR for steam blanketing
-Provides Gland Sealing Steam to Main Turbine & Main FW pumps during startup

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2
Q

During normal operation where is Aux. Steam supplied from ?

A

Normally supplied from the units Main Steam system

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3
Q

During shutdown or startup where is Aux. Steam supplied from ?

A

Supplied from other operating units

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4
Q

What does the Aux. Steam Condensate Receiver Tank do ?

A

Receives condensate and acts as a surge tank & suction point for Condensate Transfer Pumps

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5
Q

What is the Vent Condenser used for ? What is the Vent Condenser cooled by ?

A

-Used to condense any steam left in the Aux. Receiver Tank & vent any non-Condensable gases to Radwaste Building Ventilation
-Cooled by NC

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6
Q

Where can the Condensate Transfer pumps discharge to ? When would you be discharged to LRS TDS Holdup Tank ?

A

-Main Condenser
-LRS TDS Holdup Tank: Discharges when RU-7 detected radiation by inlet to Aux Steam Receiver Tank

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7
Q

When Main Steam enters supplies Aux. Steam what does it go through? What is the pressure reduced to ?

A

-Main steam goes through 1of3 Pressure Reducing Valves
-Pressure is reduced from 1000-1150psig to 250psig

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8
Q

What is the relief valves setpoints on the 250psig Aux. Steam line?

A

The relief valve setpoint is 275psig

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9
Q

What’re the loads that is supplied by the 250 psig Aux. Steam line?

A

Supplies:
-MFWP Turbines(Overspeed Testing)
-Gland Seal Steam
-Condensate Spargers
-‘A’ Aux FW Pump Turbine(Overspeed Testing)

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10
Q

What is the Condensate Cross-Tie used for at the discharge of the Condensate Transfer Pumps ?

A

Used to transfer condensate back to the unit it came from during startup & shutdown

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11
Q

What happens if the Condensate Receiver Tank radiation monitor is unavailable?

A

Must take samples before being sent back to Main Condenser

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12
Q

What happens if NC is unavailable to the Vent Condenser ?

A

NC will have to secured until NC can be restored

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13
Q

What does the Aux. Steam provide to the MSRs during shutdown ?

A

Provides steam blanketing to prevent corrosion to the tubes

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14
Q

When does Aux. Steam provide Gland Seal Steam to the turbine ?

A

Provides its during startup & power operation

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15
Q

How does Aux. Steam interface with FW Heater Extraction Steam & Drain ?

A

Sends Aux. Steam condensate drains to ED system blowdown stack

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16
Q

What buildings does the Aux. Receiver Tank receive Aux. Steam from ?

A

Receives Aux. Steam from Aux. Building & Radwaste Building

17
Q

What’s flow path is provided for the Condensate Transfer Pumps to prevent overheating ?

A

There is a 5gpm mini flow line to the Aux Steam Receiver Tank to prevent overheating

18
Q

When is each Condensate Transfer Pumps started/stopped ?

A

-Lead pump will starts on HI LVL in aux. receiver tank
-Standby pump will start on HI-HI LVL in Aux. Receiver Tank
-Both pumps stop on a LO LVL

19
Q

What is the maximum operating temp for the Condensate Transfer pumps mechanical Seals? What is the max operating pressure limit for Aux. Receiver Tank?

A

-Mechanical seals max operating temp is 250F
-15psig

20
Q

What is the automatic feature associated with RV-11A & B, during a high rad on RU-7?

A

-RV-11A going to the main condenser will isolate on high rad
-RV-11B will open to direct flow to LRS TDS Holdup Tank

21
Q

If high radiation redirects flow to LRS TDS Holdup Tank, how would you reset flow back to main condenser once High Radiation alarm clears ?

A

Must be manually reset by lifting latch upward until it engages with latch

22
Q

What will trip the Aux Steam Supply Header cutout valves (PV-331,332) closed ?

A

-Trip on ruptured Aux Steam Line in Aux Building, CST Pipe Tunnel, or HUT Pipe Tunnel indicated by HI Pressure

23
Q

What do the 20 pressure switches throughout Aux. Building & Pipe Tunnels provide for the Aux Steam cutout valves ? How do you reset a shutoff valve once the over pressurization has been corrected ?

A

-Any of these switches can cause these cutoff valves to close isolating Aux Steam Loads
-Cutoff valve must be manually reset by lifting latch upward until it engages

24
Q

How does the three position local control switch for the Aux Steam Condensate Transfer Pumps work ?

A

Start- Will start pump & send condensate to main condenser or TDS Holdup Tank
Stop- Pump will stop
Auto-controlled by alternator by level switches on receiver tank

25
Q

When will the Aux Steam Condensate transfer pumps trip ?

A

-Lead pump stops on LO level
-LO LO level will trip pump

26
Q

When will the Condensate transfer pumps Start/Stop ?

A

-Lead pump starts on HI level in receiver tank
-Standby pump will start on HI-HI level
-Both pumps trip on low level

27
Q

Why does a HI-HI level in the Aux Steam Receiver Tank have to be investigated ?

A

Receiver tank is connected to Aux. Building Vent. which could possibly flood the ductwork

28
Q

Where is the condenser Aux Steam being used for the MFWP, Gland Seal Regulator, MSRs, & AFWP returned to ? How does the condensate get returned back to the unit it came from ?

A

-All will collect in condenser, except AFWP will exhaust to atmosphere
-Will be returned by Main Condensate pumps

29
Q

Why do the units normally have there Aux Steam systems cross connected?

A

Cross connected to allow for rapid restoration of turbine gland seal steam in event of a MSIS

30
Q

In event of a unit shutdown where is the Aux Steam Receiver Tank flow routed to ?

A

Routed through Condensate crosstie valve back to supplying unit

31
Q

What valve supplies steam to the unit during start up or shutdown ?

A

V-15 will be supplying the steam

32
Q

What is water hammer defined as ?

A

A pressure change in closed conduit resulting from change in liquid velocity

33
Q

What’re operator actions to prevent water hammer ?

A

Limited to slow throttling valves with access solid systems, voided lines,or lines with liquid/steam interfaces

34
Q

What is needed to reduce voids & steam bubble collection?

A

Preliminary venting/vacuum breaking of systems

Systems (62 decks)

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