Term
| How does nuclear power propulsion work? |
|
Definition
| It utilizes fission as a heat source. |
|
|
Term
| What is the basic fission equation? |
|
Definition
235U+1n-->236U--->FF1+FF2+2.431n+Energy
92 92 |
|
|
Term
| What are some types of nuclear by-products? |
|
Definition
| Alpha Particles, Beta Particles, Gamma Rays, and Neutrons. |
|
|
Term
| What are alpha particles? |
|
Definition
| A nuclear by-product that is quickly ionized to stable He atom, and stopped by skin. |
|
|
Term
|
Definition
| A nuclear by-product; electrons which can be stopped by clothing. |
|
|
Term
|
Definition
| A nuclear by-product; a form of Electromagnetic radiation. Not a particle, it has great penetrating ability and is a biohazard. It must be shielded against (water - good, steel - better, lead - best) |
|
|
Term
| Are nuetrons a nuclear by-product that must be shielded against? |
|
Definition
| Yes, they are highly penetrating. |
|
|
Term
| What are the 2 types of neutrons? |
|
Definition
|
|
Term
| What type of neutron is the main producer of fission? |
|
Definition
|
|
Term
| What is critical reactivity? |
|
Definition
| When the number of neutrons stay constant between generations. |
|
|
Term
| What is Sub-Critical reactivity? |
|
Definition
| When the number of neutrons is less than previous generation. |
|
|
Term
| What is Super-Critical reactivity? |
|
Definition
| When the number of neutrons is more than the previous generation. |
|
|
Term
|
Definition
| Emergency Rx Shutdown via inserting control rods (absorb neutrons). |
|
|
Term
| What are the advantages of using Nuclear Power? |
|
Definition
| Allows a submarine to be truly submersible, requires less logistical support, and you only have to refuel once every 10-20 years. |
|
|
Term
| What are the disadvantages of Nuclear Power? |
|
Definition
| Considerable cost of construction/ decommission, weight consideration of shielding materials, and the environmental concerns-long half-lives. |
|
|
Term
| What does the pressurizer in a nuclear power plant do? |
|
Definition
| It keeps the primary plant under significant pressure (2000 psig or more), which means that water can be heated to a much higher temperature w/o boiling. |
|
|
Term
| What does the primary collant pump do? |
|
Definition
| Establishes & maintains flow of the primary coolant from the S/G to the reactor. |
|
|
Term
| What does Zircaloy cladding do? |
|
Definition
| Provides structural strength and corrosion resistance to prevent escape of fission products into coolant. |
|
|
Term
|
Definition
| A thermal fuel that requires a thermal neutron to induce fission. |
|
|
Term
| What is the primary coolant in a nuclear power plant? |
|
Definition
| The substance that transfers heat from the core to the steam generator. |
|
|
Term
| What is a moderator in a nuclear power plant? |
|
Definition
| A substance that controls thermalization of fast neutrons by scattering. |
|
|
Term
| What do naval reactors use as a coolant and moderator? |
|
Definition
| Water, which helps establish a negative temperature coefficient of reactivity. |
|
|
Term
| What is the temperature coefficient of reactivity? |
|
Definition
| A way to describe the impact of the temperature of the coolant on the fission process; a very stable process… unlike Chernobyl. |
|
|
Term
| What do contrl rods do in a nuclear reactor? |
|
Definition
| Offer one element of reactor control and safety by absorbing neutrons. |
|
|
Term
| Which by-products of a naval reactor are not a concern? |
|
Definition
| Alpha and Beta particles. |
|
|
Term
| Which by-products of a naval power plant are a concern for us? |
|
Definition
|
|
Term
| What does the propulsion order AA 1/3 mean in a nuclear steam plant? |
|
Definition
|
|
Term
| What does the propulsion order AA 2/3 mean in a nuclear steam plant? |
|
Definition
|
|
Term
What does the propulsion order AA I
mean in a nuclear steam plant? |
|
Definition
|
|
Term
What does the propulsion order AA II
mean in a nuclear steam plant? |
|
Definition
|
|
Term
What does the propulsion order AA III
mean in a nuclear steam plant? |
|
Definition
| “Flank”; > 20 knots. Used for max. propulsion |
|
|
Term
What does the propulsion order AZ
mean in a nuclear steam plant? |
|
Definition
| “All Stop” – no steam is applied to engines, but ship is still moving based on momentum. |
|
|
Term
| What does the propulsion order AB 1/3, 2/3, Full, mean in a nuclear steam plant? |
|
Definition
| Backing bells – used to slow or stop the ship and, if necessary, cause astern propulsion. |
|
|
Term
| How does automatic combustion control work? |
|
Definition
| ACC senses the pressure drop/rise in the steam drum and directs for greater/less combustion to occur. |
|
|
Term
| What are the 3 parts of the Automatic Boiler Control System? |
|
Definition
| The Automatic Combustion Control(ACC), Feedwater Conrtol System (FCS), Main Feed Pump (MFP) Differential Control System. |
|
|
Term
| What is the purpose of the Feedwater Control System (FWC)? |
|
Definition
| It Regulates the supply of feedwater sent to the boiler for use in steam production. |
|
|
Term
| What is the purpose of the MFP Differential Pressure Control System? |
|
Definition
| Ensures that the feed water-supply pressure is maintained at a constant value above the steam-drum pressure (typically, 75 psi). |
|
|
Term
| What are the ABC Modes of Control? |
|
Definition
| Local-Manual, Remote-Manual, and Automatic. |
|
|
Term
|
Definition
| A science dedicated to prevention of corrosion and promoting good heat transfer inside any steam plant. |
|
|
Term
| What are some General Steam Plant Casualties on the steam side? |
|
Definition
| Steam line rupture, Carryover/turbine damage, and Uncovering heat transfer tubes |
|
|
Term
| What are some General Steam Plant Casualties on the Condensate & Feed side? |
|
Definition
| Loss of vacuum or Improper hotwell level control, Loss of feed or Feed piping rupture, Poor chemistry control / Chlorides, and Flooding. |
|
|
Term
| Where does fission occur? |
|
Definition
|
|
Term
| What are the two purposes of the fission process? |
|
Definition
| Propulsion and Explosion. |
|
|
Term
| What are some Reactor Plant Casualties? |
|
Definition
| SCRAM’s, Over-power conditions, Over-pressure conditions, Loss of moderator or fluid flow. |
|
|
Term
| What contributes to the reliability of Nuclear Power? |
|
Definition
| Redundancy, Backup Electrical Power, and Backup Propulsion. |
|
|
Term
| What is the purpose of a valve? |
|
Definition
| To control the amount & direction of fluid flow through the lines of a piping system; Start, stop, throttle, and direct flow. |
|
|
Term
| What are the 8 valve components? |
|
Definition
Valve body,
Packing gland/nut,
Stem,
Wheel/Operating mechanism,
Disc,
Seat ,
Bonnet,
Packing. |
|
|
Term
| What are the 2 main types of valves? |
|
Definition
| Stop valves and check valves. |
|
|
Term
| What are some exapmples of stop valves? |
|
Definition
Globe valves,
Gate valves,
Ball valves,
Butterfly valves. |
|
|
Term
| What are some types of check valves? |
|
Definition
Swing and Lift Check Valves,
Stop Check Valves. |
|
|
Term
| What is one example of a special-purpose valve? |
|
Definition
|
|
Term
| What is a globe valve used for? |
|
Definition
| For flow control, it has excellent throttling characteristics,but a large pressure drop across the valve. |
|
|
Term
|
Definition
| Mechanical devices used to cause fluid to flow in a piping system. |
|
|
Term
|
Definition
| A Mechanical device used to move a large volume of air. |
|
|
Term
| What type of fan is used in ventilation systems? |
|
Definition
|
|
Term
| What type of fan is used in boiler air feed systems and as compressors? |
|
Definition
|
|
