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Nuclear Energy
Descripción
Nuclear energy from Environmental Science A-Level
Sin etiquetas
nuclear
energy
nuclear energy
aqa
a-level
physics
envronmental
environmental science
science
exams
revision
mind map
fusion
fission
reactors
enviromental science
as level
Mapa Mental por
Kieran C
, actualizado hace más de 1 año
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Creado por
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Resumen del Recurso
Nuclear Energy
Uranium Extraction
Polymer Adsorption
Uranium dissolved in seawater adsorbs onto polymers
The uranium can be washed off using acids and concentrated
Phosphate Mining
Uranium in phosphate desposites can be seperated in the phosphate mines
Coal Ash
Uranium can be extracted from coal ash
This will become economic if the price of uranium rises enough
New Reactor Designs
Molten Salt Reactors
Using molten salt as a collant makes reactor far more efficent
It can operate at much higher temps high without needing high pressure to prevent the coolant boiling
Much smaller than gas-cooled reactors so are cheaper to consturct
Plutonium Reactors
Most reactors work by fission of Uranium 235
Uranium 235 is only 0.7% of the uranium in the mined ore
The remaining 99.3% is uranium 238 which is not fissile
However U238 can be converted into Plutonium 239 by neutron bombardment
An isotope that is not in itself a fissile fuel but can be converted into a fissile fuel by neutron bombardment is called a "fertile fuel"
These reactions use breeder reactors. These reactors release energy for electricity and can produce more new fissile fuel than they use
Thorium Reactors
Thorium 232 is not fissile, however it is a fertile fuel and can be converted into Uranium 233
The reactor has rods of U233 which release energy and neutrons to maintain the chain reaction
There are also rods of Th232 in the reactor core which breed U233 as they become bombarded with neutrons
The U233 can be extracted to make new fuel rods
Nuclear Fusion
Joining the nuclei of small atoms such as isotopes of hydrogen e.g. deuterium
Energy source of all stars but producing controllable fusion on a small scale on Earth has proven difficult
Fuel sources
Deuterium
Hydrogen 2, extracted from water
Tritium
Hydrogen 3, produced by neutron bombardment of lithium
Solar Nuclear Fusion
Consists of 70% H and 28% He
Every second 508 million tonnes of H are converted to He
Fusion occurs ar temps around 15 million oC
Average temp of sun is 6000 oC
The energy then leaves the sun as short wave radiation
Toroidal Reactors
Torus reactors such as the Joint European Torus (JET) bear Oxford
If it is actually possible, may not be commercially viable for many years
ITER
A new tokamak reactor that builds on the knowledge gained from JET
Should be operational around 2025
500MW output from 50MW input
Maintain fusion for longer periods
Use a blanket of lithium around the reactor to breed new tritium fuel
Laser Fusion - HiPER
High Powered laser Energy Research
Research's Laser fusion
Small scale fusion that avoids the problems of plasma containment and refuelling as with torus reactors
Small spheres of frozen deuterium and tritium would be dropped into intense laser beam to initiate fusion
Construction planned to take place from the late 2020's
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