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Mechanical SM > Bank Questions > Flashcards

Bank Questions Flashcards

1
Q

Q2. What are the 3 containment boundaries?

A

Primary, Secondary and Intermediate.

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2
Q

Q3. What is the function of Steam Generators?

A
  1. To produce high quality steam for the operation of the Main and Turbo-Generator and Auxiliary steam systems.
    2 To remove decay heat from the reactor core using the SG cooldown system.
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3
Q

Q4. List 5 items in the SG drawing.

A
  1. Driers
  2. Kinetic head destroyer
  3. Feedwater inlet nozzle
  4. Downcomer
  5. Tube bundle assembly
  6. SG main support
  7. Separator assembly
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4
Q

Q5. What is the function of the auxiliary steam system?

A

To provide steam at a constant pressure of 14 bar to the following:

  1. Main air ejectors
  2. Gland steam system
  3. Braby
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5
Q

Q7. Describe the basic operation of the gland steam system.

A

Steam is supplied at constant 14 Bar from the Auxiliary Steam System to the Gland Steam Supply Manifold. This the passes through cascade trim valves to both the Generator turbine shaft gland pockets and Main turbine gland pockets.

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6
Q

Q1. Define Plant state B.

A

Normal shutdown state but with reduced temperature. Minimising energy risk if an accident was to occur.

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7
Q

Q2. What is the function of a separator? How does it work?

A

Removes water from a system via centrifugal force.

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8
Q

Q4. What is the function of a Dump Steam Valve?

A

These control the discharge of steam to the main condensers during these operations:

  1. Power range testing
  2. Reactor Cooldown
  3. Emergency upstream leak
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9
Q

Q1. What is the system code of the Primary Circuit?

A

M

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10
Q

What controls the discharge of steam to the main injectors?

A

Dump steam valve

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11
Q

Q8. State the components of a steam drain system.

A

Back Pressure Regulating Valve
Yarway Steam Trap
Key Trap

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12
Q

Q7. What is the function of a steam drain system?

A

The Steam Drains System removes condensate from the steams system enabling the system to be fully drained of water during the shutdown periods.

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13
Q

What is the system code of the Steam Drain System?

A

SD

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14
Q

What is the function of the Main Machinery Raft?

A

The MMR carries the main propulsion and power generation machinery and also forms the bottom half of the main gearbox. These are mounted of residual modules which reduce noise transmission.

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15
Q

Q8. Where is the astern section of the main turbine?

A

This is at the forward end of the rotor and consists of a Curtis Wheel.

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16
Q

Q9. Why is there a separating wall between Ahead/ Astern sections of the Main Turbine.

A

This prevents steam leakage between the two sections.

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17
Q

Q9. Name four items on a shaft line diagram

A 
Main Turbines
Main Gearbox 
Main Wheel
Flexible coupling 
Journal Bearings
Thrust Block
Loose Couplings
Shaft Locking Gear
Torsion Meter 
Shaft Seal
FWD Stern Tube Bearing 
FWD Stern Tube
AFT Stern Tube & Bearing
Propulsor
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18
Q

Q12. What are the functions of the Main Circulating Water System?

A
  1. Provide a flow of cooling water to the main condenser so that optimum condenser vacuum and steam conditions can be maintained in both the main turbines and Turbo Generators.
  2. Supply the after stern tube bearing with water for cooling and lubrication.
  3. Provide a supply of water to the Clean Sea water System
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19
Q

What is the system code of the Main circulating water system?

A

MCW

20
Q

What is the system code of the clean salt water system?

A

CSW

21
Q

Q12. What is the system function of the Clean Sea Water System?

A

Provides a supply of pressurised and filtered sea water to:

  1. Main shaft FWD and AFT seals
  2. Main Shaft emergency seal and forward stern tube bearing
  3. Main Circulating Water Pump motor cooling circuit
22
Q

Q13. What is a clean sea water pump?

A

This is a glandless, canned centrifugal pump. Each pump is solidly mounted on its own side main condenser hotwell.

23
Q

What is the function of the feed transfer system?

A

A. Provide feed water storage facility
B. Provide normal and emergency make up water facilities for
- The main feed system
- Other associated systems ie chilled water
- The primary loop under normal and emergency conditions

24
Q

What are the primary functions of the Feed Transfer system?

A

A. Receives water from made water system
B. Fills made water tanks from shore
C. Transfers water from the made water tanks to any reserve feed tank
D. Transfers water between reserve feed tank
E. Recirculates contents of any RFT through demineraliser
F. Discharges contaminated water from any rft or any made water tank direct to the bilge
G. Transfers water from the made water tank to ships fresh water tanks
H. Provides a facility for sampling all feed tanks, demineraliser outlet and feed transfer pump discharge
I. Provides a dedicate reserve feed water for mixing with AFFF for firefighting
J. Transfers water from condenser hotwells to coolant makeup systems

25
Q

Q10. What is the system code for the Main Feed System?

A

FW ie Feed Water

26
Q

Q14. What are the labels on the Main Feed System?

A 
Main Condenser
Extractor
Water sampling station
RFT
Air ejector
SG Level control
27
Q

Q15. List 4 items cooled by the FWD ships Fresh Water Cooling system

A
  1. Chilled water plants
  2. 70kw mg sets
  3. 35 kw mg sets
  4. 10 kw mg sets
  5. h2 burners
  6. r12 removal units
28
Q

Q16. What does SLIV stand for, what does it do?

A

Surge line isolating valve

This allows a means to isolate the pressuriser from the primary circuit in the event of a pressuriser leak circuit when the valve is shut, provided pressuriser is greater than RPV pressure.

29
Q

Q17. What is w501 and what does it do?

A

Electrically operated solenoid valve which activates in case a leak occurs

30
Q

Q18. What is the function of the Coolant treatment system?

A
  1. Provided to remove soluble and suspended radioactive corrosion and fission products from the primary coolant during reactor operation, whilst assisting to maintain PH. Activity is maintained at a level which permits personal to enter RC approximately 15 minutes after shutdown.
  2. Provide a connection to the sampling system from before and after the ion exchange column.
  3. Ensure water discharged from primary circuit is at lowest level of contamination
  4. Removal of decay heat using non regen cooler when in LPDHR
31
Q

Q19. Coolant discharge system - where does the HP discharge go?

A
  1. MUD vessel

2 Overboard via D406

32
Q

Q20. What are the 3 subsections to the coolant makeup system?

A

Recirculation valve
Back up system
Emergency system

33
Q

Q21. What are the components of the Primary shield system?

A

A. A steal tank surrounding the Reactor Pressure Vessel which contains:
-RCFW Cooling coils
- Neutron detectors
- Core Catcher
- Test Source Track
B. A shield water head tank with interconnecting piping and valves

34
Q

Q22. What are two methods of using HPDHR system?

A
  1. Forced high pressure decay heat removal

2. Natural high pressure heat removal

35
Q

Q23. What is the system code of the coolant treatment system?

A

W

36
Q

Q11. Describe the main circulating water pump

A

5 blade impeller mounted directly onto the rotor of a canned two speed AC induction motor contained within a motor casing.
A filtered water supply from the clean sea water system is piped via isolation valve to the motor casing. This cools and maintains an internal pressure which prevents water coming in.

37
Q

Q14. List 4 items cooled by the AFT ships fresh water cooling system

A 
CW Plants
LO Coolers
Turbo Generator Air coolers
Evaporators
HP Air comps
Emergency prop coolers
Turbine throttle control oil coolers
LP Bilge pump cooling coil
HP bilge and ballast priming pumps
38
Q

Q15. What happens if a power transient occurs (Pressuriser)?

A

The spray line provides a spray of primary circuit cold leg water to the pressuriser steam space to reduce pressure during a power reducing transient.

39
Q

Q16. In what order do the primary relief valves open?

A

Steam, Low then High

40
Q

Q17. What is W501 and what does it do?

A

It is an electrically controlled solenoid valve which is activated in case a leak occurs.

41
Q

Q18. Coolant discharge system- what drains into the Active and Non active tanks?

A 
Active:
-Primary Sampling
-Primary isolation valve cycling
-Interspace vent leakage
- Boundary valve leakage 
- System drainage for maintence
- Primary shield tank overflows directly to bilge
Non active:
- RCFW head tank overflow
-Condensation from ATUs, RPV drip shield
- Backflushing the VOW flasks
- Active drain tank overflow
42
Q

Q19. Which valves does the VOGs (Valve Operating and Gas System) operate?

A

This does the valve operated water flasks

  • Main isolating valves
  • Surge line isolating valves
  • High pressure decay heat removal isolation valves
  • Primary relief valve isolating valves
43
Q

Q20. What are the functions of the reactor fresh water cooling systems; what does it cool?

A

Fitted to provide a continuous flow of cool water to the following:

  • Main Coolant Pump cooling jackets
  • Control Rod Drive mechanism cooling jackets
  • Coolant treatment system non regen cooler
  • Primary shield tank cooling coils
  • Motor generator sets
44
Q

Q21. What is the function of the high pressure heat decay removal system?

A
  • Remove decay heat from the reactor core following loss of normal heat sink.
  • Remove decay heat from the core during normal shutdown
45
Q

Q22. What is the system code for the primary shield system?

A

H

46
Q

Q12. What is the function of the Clean Sea water system?

A

Provides a supply of pressurised and filtered sea water to the following:

  • Main shaft fwd and after seals
  • Main shaft emergency seals and forward stern tube bearing
  • MCWP motor cooling circuit
47
Q

Q6. Where does the valves spindle leak off collect from?

A

Generator turbine control valve spindle inner pockets
TGCSEV spindle inner pockets
Main turbine ahead and astern throttle valve inner pockets
Cruise valve spindle inner pocket

Mechanical SM (1 decks)

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