Nuclear fission: lecture 9.2 B

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Presentation transcript:

Nuclear fission: lecture 9.2 B Nuclear power plant, France

What holds a nucleus together? The strong nuclear force causes protons and neutrons to attract each other Protons both attract and repel each other In elements with 83+ protons, nuclei are unstable, releasing radiation as they decay

Nuclear fission: breaking up Heavier nuclei split apart into lighter nuclei Energy is released as radiation and neutrons

Chain reactions Neutrons released cause more atoms to decay Critical Mass is the amount of material needed to start and sustain a chain reaction

Uses for chain reactions Nuclear power plants Diablo Canyon, CA Nuclear powered submarine Nuclear powered satellites Nuclear powered aircraft carrier

Controlling a reaction In power plants, control rods slow down the reaction Water absorbs the heat of the reaction

Inside a nuclear power plant Heated water turns to steam, which spins a turbine, making electricity

Containment structures are made to keep radiation inside the reactor. Nuclear plants create no greenhouse gases

Nuclear plants Reactor and cooling towers locations of plants in US

Global nuclear reactors