Exam (elaborations)
Reactor Plant Design
- Module
- A level Biology
- Institution
- A Level Biology
Reactor Plant Design
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Reactor Plant DesignPressurised Water Reactor - correct answer-1. water in contact with core mechanics a liquid
state
2. water in primary system is maintained at high pressures
there are three separate circulating fluid systems - correct answer-1. primary
2. secondary
3. tertiary
primary fluid system - correct answer-(reactor cooling system)
1. transfers energy from nuclear core to the steam generator
2. light water (H2O) pressurized ad kept as liquid (2250 psi)
secondary fluid system - correct answer-(main steam and condensate/ feedwater)
1. water is boiled by energy obtained from primary
2. turbine produces useful work from steam
tertiary fluid system - correct answer-water used to cool condenser and return secondary
steam to the liquid form
containment facility is around what fluid system - correct answer-the primary
the three physical barriers for fission products to enter the enviorment - correct answer-1.
fuel cladding
2. primary system
3. containment facility
what is the principle function of the primary system (civilian pwr) - correct answer-transfer
heat from fuel to steam generator
what is the alternate function of the primary system (civilian pwr) - correct answer-contain
any fission products that escape the cladding
how many loops does a primary system have - correct answer-multiple (2,3, or 4 loops)
what are the components of a pressurized water reactor (PWR) - correct answer-reactor
vessels
steam generators
reactor coolant pump
pressurizer
connecting piper
auxiliary systems
1. inject boron
2. emergency cooling
, general things to know about the primary - correct answer-1. reactor coolant pumps (rcp's)
are located on the cold leg
2. PZR surge line id attached to the outlet of the pump
3. no isolation valves in the main primary coolant flow path
4. volume of COLD LEG is MUCH GREATER than the volume of the HOT LEG
the components of the reactor vessel - correct answer-in the major vessel
1. reactor vessel & closure head
2. core barrel
3. reactor core
4. upper internals package
*know how to draw this it WILL be on the QUIZ/TEST*
reactor vessel - correct answer-1. cylindrical vessel with hemispherical bottom
2. removable closure head
-for refueling
3. multiple inlet and exit nozzles
4. constructed of a manganese/molybdenum steel, clad with stainless steel (about 12 inches
thick)
characteristics of core barrel - correct answer-1. slides down into the reactor vessel
2. houses and supports the fuel core
3. hangs inside the reactor
4. thermal expansion/ contraction
5. acts as thermal shield for vessel wall, prevents gamma heating of vessel wall
characteristics of the reactor core - correct answer-1. cylindrical shape (12 feet high, 12 feet
diameter)
constructed of 200 fuel assemblies
2. each grid assembliy (8.5 in by 8.5 in)
16 by 16 grid of fuel rods
3. each fuel rod, stack of fuel pellets encased in cladding material (0.38 diameter), made of
zircaloy
4. when they refuel the only remove (1/3) of them
5. fuel assemblies last 6 years
characteristics of the upper internals package - correct answer-1. guide columns to guide
control rods
2. fluid battles ti direct flow
3. sits on top of fuel core
4. prevents from moving upward
flow path of coolant in the core - correct answer-1. enters inlet nozzle from reactor coolant
pump
2. flows downwards the vessels & core barrel
3. at bottom of vessel flow is turned upward
4. flow upward through fuel assemblies removing heat
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