GCSE Physics (AQA)

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Nuclear Reactor Safety

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Atomic structure Nuclear fission and fusion

Nuclear Reactor Safety

4:35 Nuclear Energy
Spec 4.4.2.4 4.4.4.1
Previous Nuclear Reactor Next Nuclear Fusion
  • Fish and reactors are surrounded by thick concrete shields to protect workers from radiation.
  • Nuclear fish and reactors harness heat from fish and reactions in fuel rods, producing harmful radiation.
  • Neutrons causing chain reactions can be harmful if contacted.
  • Products of fish are unstable nuclei emitting beta particles and gamma rays, which are harmful.
  • People cannot enter the reactor during fish and reactions.
  • Thick concrete walls stop radiation, including gamma rays, from escaping.
  • Control rods control the rate of chain reactions and are different from fuel rods.
  • Control rods, made from boron, absorb neutrons and can be moved in and out of the reactor.
  • Control rods block neutron paths, limiting chain reactions.
  • Limiting neutrons is important to prevent uncontrolled reactions.
  • To slow reactions, more control rods are lowered or moved further down.
  • More control rods mean fewer neutrons move between fuel rods, reducing chain reactions.
  • In emergencies, rods are lowered completely to stop reactions.
  • Lowering rods blocks paths between fuel rods, stopping neutrons and ending reactions.
  • Safety features in fission reactors are crucial for design and operation.

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