Heater Bleeds And Drains(HAW)

Question 1

What is the purpose of the Heater Bleeds and Drains System?

Answer 1

Increase cycle efficiency by pre-heating condensate/feedwater with the extraction steam supplied from various stages of the high pressure and low pressure turbines

Question 2

What is the system designator for the Heater Bleeds and Drains System?

Answer 2

HAW

Question 3

What is the design/purpose of the Extraction Line Check Valves?

Answer 3

1. Installed on the Extraction Steam lines to the A-E Heaters
2. Quickly isolate the turbine from the heater shells following a turbine trip to prevent overspeed if the energy was to backflow from the heaters to the turbine
3. Spring assisted closed, fully closed by reverse flow

Question 4

When do the Extraction Line Check Valves automatically close?

Answer 4

1. Turbine trip
2. Emergency High level(2nd level switch)
3. Loss of air
4. Loss of power to solenoid supplying air

Question 5

Where do all of the Extraction Steam line drain valves drain to?

Answer 5

The condenser

Question 6

What is the purpose of the Before Extraction Check Valve Drain Valves?

Answer 6

These valves open to drain water preventing water hammer and water introduction.

Question 7

What will cause the Before Extraction Check Valve Drain Valves to open and close?

Answer 7

1. The valves are manually closed during turbine warmup
2. The valves will automatically open on:
   A. Turbine trip
   OR
   B. Less than 15% turbine load as sensed by impulse pressure
   OR
   C. Emergency high level in the associated heater

Question 8

What is the purpose of the Continuous Drain Orifice downstream of the Extraction Line Check Valve?

Answer 8

Continuously drains moisture from the line to the condenser to prevent water hammer and water introduction

Question 9

What will cause the Continuous Drain Orifice Bypass Valve to automatically open?

Answer 9

The valves will automatically open on:
A. Turbine trip
OR
B. Less than 15% turbine load as sensed by impulse pressure
OR
C. High level in the drain line(1st level switch)

Question 10

What is the purpose of the Extraction Line Isolation Before Seat Drain Valves?

Answer 10

Prevent water hammer when initiating Extraction Steam flow

Question 11

What will cause the Extraction Line Isolation Before Seat Drain Valves to open or close?

Answer 11

1. Automatically open on:
   A. Turbine trip
   OR
   B. Less than 15% load as sensed by turbine impulse pressure
2. Automatically close when “Shell Warming” is selected, and automatically open when “Shell Warming” is deselected

Question 12

What will cause the Heater Inlet Steam Isolation Valve to automatically close, and what is unique about the automatic closure signal?

Answer 12

1. Automatically closes on Emergency High Level in the associate heater.
2. The Heater Inlet Isolation Valves are throttle valves so to open and close them the Pushbuttons must be held
3. The closure signal is only present when the Emergency High level is present. If the condition clears while the valve is stroking it will stop at some intermediate position

Question 13

What will cause the Heater Inlet Steam Bypass Valve to automatically close?

Answer 13

Emergency High level in the associated heater

Question 14

What heaters have a Heater Inlet Steam Isolation Valve and Bypass Valve?

Answer 14

The ‘A’ and ‘B’ Heaters are the only heaters that have this configuration

Question 15

Where are all of the Heater Vents directed to?

Answer 15

The condenser

at 85% load most of the vents are closed

Question 16

What does ‘A’ Bleed supply and when?

Answer 16

‘A’ Bleed supplies the MSR first stage heating steam above 10% load

Question 17

What does ‘C’ Bleed supply, and when?

Answer 17

‘C’ Bleed begins supplying the Auxiliary Steam header between 15% and 20%

Question 18

What does ‘E’ Bleed supply, and when?

Answer 18

‘E’ Bleed supplies the Main Turbine and CFPT Steam Seals when greater than 60%

Question 19

What are the inputs to ‘A’ Heater shells?

Answer 19

1. MSR Second Stage Drain Tank drains
2. MSR Second Stage Reheater Scavenging Steam
3. ‘A’ Bleed Steam

Question 20

Where does each MSR Second Stage Reheater Drain Tank drain go?

Answer 20

1. A and B Second Stage Reheater Drain Tank drains go to the A2 Heater
2. C and D Second Stage Reheater Drain Tank drains go to the A1 Heater

Question 21

What automatic actions occur on an ‘A’ Heater Emergency High Level?

Answer 21

1. Closes the Extraction Steam Line Isolation and Bypass Valve to the ‘A’ Heater
2. Isolates the inputs from the MSR Second Stage Drain Tank and Scavenging Steam
3. Closes the ‘A’ Heater Normal Drain Valve
4. Opens the Before Extraction Check Valve Drain on the Extraction Steam line

Question 22

What are the inputs ‘B’ Heater Shells?

Answer 22

1. MSR First Stage Drain Tank drains and Scavenging Steam
2. ‘A’ Heater normal drains
3. ‘B’ Bleed Steam

Question 23

Where does each MSR First Stage Reheater Drain Tank drain go?

Answer 23

1. A and B First Stage Reheater Drain Tank drains to the B2 Heater
2. C and D First Stage Reheater Drain Tank drains to the B1 Heater

Question 24

What actions occur on an Emergency High Level in the ‘B’ Heaters?

Answer 24

1. Closes the Extraction Line Isolation and Bypass Valves
2. Isolates the inputs from the MSR First Stage Drain Tank and Scavenging Steam
3. Closes the ‘A’ Heater input drain
4. Closes the ‘B’ Heater Normal Drain Valve
5. Opens the Before Extraction Check Valve Drain on the Extraction Steam line

Question 25

What is unique about the ‘C’ Heater?

Answer 25

The ‘C’ Heater is a “dry” heater

Question 26

What are the inputs into the ‘C’ Heater Drain Tank?

Answer 26

1. MSR Moisture Separator Drain Tanks 2. ‘B’ Heater drains 3. ‘C’ Heater drains 4. ‘C’ Heater Drain Tank Pumps discharge vents 5. Main Feed Pump seal leakoff 6. ‘C’ Heater Drain Tank Pump discharge recirculation

Question 27

What actions occur on an Emergency High Level in the ‘C’ Heater Drain Tank?

Answer 27

1. Opens the Before Extraction Check Valve Drain 2. Closes the ‘C’ Heater Extraction Line Isolation 3. Closes the ‘B’ Heater Normal Drain Valve 4. Closes the MSR Moisture Separator Drain Tank input 5. Closes the Main Feed Pump Seal Leakoff input

Question 28

When are the ‘C’ Heater Drain Tank Pumps placed in service, and how much flow do they contribute?

Answer 28

1. Placed in service at 70% power and removed prior to going below 70% power 2. Provide 32% of feed flow at 100% load

Question 29

What provides cooling water the ‘C’ Heater Drain Tank Pumps?

Answer 29

The Recirculate Cooling System(KR) provides cooling to: 1. Mechanical Seal Coolers 2. Seal Injection Water Coolers 3. Motor Bearings

Question 30

What will cause the ‘C’ Heater Drain Tank Pumps to automatically trip?

Answer 30

1. Turbine trip 2. Emergency low level in the ‘C’ Heater Drain Tank 3. Full load rejection greater than 56% power

Question 31

What are the inputs into the ‘D’ Heater Shells?

Answer 31

1. ‘D’ Bleed Steam | 2. Steam Generator Blowdown Heat Exchanger(BB) Vent

Question 32

What actions occur on an Emergency High Level in the ‘D’ Heaters?

Answer 32

1. Closes the ‘D’ Heater Extraction Line Isolation 2. Closes the ‘D’ Heater Normal Drain Valve 3. Closes the BB Vent to the ‘D’ Heater 4. Opens the Before Extraction Check Valve drain on the extraction lines

Question 33

What are the inputs to the ‘E’ Heater Shells?

Answer 33

1. ‘E’ Bleed Steam | 2. ‘D’ Heater Drains

Question 34

What actions occur on an Emergency High Level in the ‘E’ Heaters?

Answer 34

1. Closes the ‘E’ Heater Extraction Line Isolation 2. Closes the ‘D’ Normal Drain Valve 3. Closes the ‘E’ Normal Drain Valve 4. Opens the Before Extraction Check Valve Drain on the Extraction Steam line

Question 35

What are the inputs into the ‘F’ Heater Shells?

Answer 35

1. ‘E’ Heater Drains | 2. ‘F’ Bleed Steam

Question 36

What actions occur on an Emergency High Level in the ‘F’ Heaters?

Answer 36

1. Opens the condensate bypass valve CM-81 2. Closes the ‘E’ Heater Drain Valves 3. Closes the condensate tube side isolation valves * ***There are no isolation or drain valves in the Extraction Steam line, also the ‘F’ Drains to ‘G’ Heaters does not get closed****

Question 37

What are the inputs to the ‘G’ Heater Shells?

Answer 37

1. ‘F’ Heater Drains | 2. ‘G’ Bleed Steam

Question 38

What actions occur on an Emergency High Level in the ‘G’ Heaters?

Answer 38

1. Opens the condensate bypass valve CM-81 2. Closes the ‘F’ Heater Drain Valves 3. Closes the condensate tube side isolation valves * ***There are no isolation or drain valves in the Extraction Steam line****

Question 39

How are the drains controlled from the ‘E’ Heaters to the ‘F’ Heaters?

Answer 39

A proportional controller ensures that each ‘F’ Heater receives 2/3 of the drains from the ‘E’ Heaters

Question 40

What is the normal operating level for Heaters on Narrow and Wide Range level instruments?

Answer 40

1. Narrow Range - 0 inches 2. Narrow Range of 0 inches corresponds to a Wide Range level of 9% to 17% 3. ‘F’ and ‘G’ Heaters have a normal Wide Range level of 50%

Question 41

How is the Auto/Manual Controller for Heaters adjusted?

Answer 41

Automatic: 1. In automatic, the setpoint(red needle) is controlled by the potentiometer labeled “SET”, varying the setpoint initiates a valve position demand 2. As actual valve position changes, the actual level(black needle) will change as well Manual: In manual, the setpoint adjustment is not functional. The “VALVE” pot is used to directly vary valve position demand. The setpoint(red needle) will follow the actual level(black needle) to allow for a bumpless transfer to automatic

Question 42

What is important to remember when adjusting Heater level controllers?

Answer 42

Adjusting level in the Heaters is reactivity management related because it can have impact on core reactivity by changing feedwater inlet temperature

Question 43

What are the power supplies for the ‘C’ Heater Drain Tank Pumps?

Answer 43

1(2)C1 - 1(2)TC | 1(2)C2 - 1(2)TD

Question 44

What happens in each Heater as on a High level before reaching the Emergency High level?

Answer 44

An alternate drain will open dumping water to the condenser to attempt to lower level