Week 5 Flashcards
What is PWR
Pressurised water reactor
What is housed inside fuel plates?
Uranium 235
What material is inside control rods?
Halfnium
How do we define reactor critical?
When neutrons from next generation = those from previous
How do we define self sustaining reactor?
Reactor critical generating enough to not require shore supply
What is scram and how do we do it?
Stopping the reaction via insertion of control roads
What are the 2 modes of reactor scram?
- Automatic
- Manual
What control rod group does a partial scram use?
Group 3
How many control rods are dropped in during full scram?
All 4 groups
Name all plant states
- A
- H
- B
- C
Name the containment boundareis
- Primary
- Secondary
Describe the primary containment boundary
Submarine Hull surrounding RC RSC and tunnel
Describe the secondary containment boundary
Minimum- Pressure Hull enclosed by 26 and 88 bulkhead
Maximum- The entire pressure hull
What are the components of the primary system?
- RPV
- Control rods
- Primary circuit
- Pressuriser
- Fuel
- CRDM
- MCP
- SG
Describe the pressuriser
Vessel half filled with water with a steam bubble at the top
Main hazards of primary circuit
- Radiological
- Temprature
- Pressure
Name the components of the secondary system
- Main engine
- TGs
- Condensor
- Circulating water
- Feed water
What are the hazards of the secondary system?
- Rotating equipment
- Steam
- Electrical
- Noise
What is the function of the gearbox?
- Transfer motion from steam turbine to shaft
- Allow use of EPM
Where is Electronic propulsion motor supplied from?
Supplied from DC
What’s the function of thrust block?
Transmit propulsive force to boats structure
Function of stern seal
- Support shaft
- Prevent water ingress
- Inflation mechanism when shaft stops
Why do we use propulsor over propellor?
- More efficient
- Prevents cavatation
How many main coolant pumps do we have?
4
