Nuclear energy Nuclear energy = energy that holds together protons and neutrons within the nucleus of an atom We harness this energy by converting it to.

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Presentation transcript:

Nuclear energy Nuclear energy = energy that holds together protons and neutrons within the nucleus of an atom We harness this energy by converting it to thermal energy, which can then be used to generate electricity. AnimationAnimation Each conversion process involves transforming isotopes of one element into isotopes of other elements by the addition or loss of neutrons.

Consumers of nuclear power Nuclear power has expanded 15-fold since 1970.

Nuclear energy Comes from the radioactive element uranium The nuclear fuel cycle enriches forms of uranium to make it into usable fuel. Electricity is generated by controlling fission in nuclear reactors.

Nuclear energy Uranium is used for nuclear power because it is radioactive. Radioisotopes emit subatomic particles and high- energy radiation as they decay. Each radioisotope decays at a rate determined by that isotope’s half-life, the amount of time it takes for one-half of the atoms to give off radiation and decay.

Nuclear energy: Fission Nuclear fission = energy is released by splitting apart uranium nuclei by bombarding them with neutrons This is the process used in nuclear reactors and weapons. How are they Different?How are they Different?

Electricity generation from coal Coal is most used to generate electricity. Heat from coal burning boils steam, turning a turbine to power a generator.

Nuclear Reactor In a reactor, fission boils steam to turn a turbine and generate electricity Video Control RodsVideoControl Rods

Nuclear reactor Using plutonium, breeder nuclear fission: Makes better use of fuel Generates more power Produces far less waste Breeder fission raises the risk of explosive accidents. As a result, most breeder reactors have been shut down.

Nuclear troubles Although nuclear power is clean, lacking the pollutants of fossil fuels, it has drawbacks: Its waste is dangerously radioactive. Consequences of accidents can be catastrophic. 439 nuclear plants remain operating today in the world.

Nuclear accidents The Three Mile Island accident caused a partial meltdown.

Nuclear accidents The 1986 Chernobyl explosion caused the world’s most severe nuclear power plant accident.

Nuclear accidents Fallout from Chernobyl was deposited across Europe.

Fukushima 2011

Nuclear Fuel Life Cycle

Environmental impacts Energy sources present differing environmental impacts.

Yucca Mountain Nuclear Waste Facility

Nuclear energy: Fusion Nuclear fusion = nuclei of lightweight elements are forced together Not efficient for power production, so is not (yet) used.

Nuclear Fusion Reactor Prototype