4.8 Nuclear Fission & Fusion

Question 1

Equation

Deuterium - Tritium reaction

Answer 1

²₁D + ³₁T → ⁴₂He + ¹₀ + energy

Question 2

Define

Critical size

Answer 2

The critical size of a fuel assembly is the size at which it is just capable of sustaining a chain reaction.

Question 3

Purpose of

Control rods

Answer 3

Boron-coated steel rods, called control rods are used to absorb excessive neurons.

Question 4

In a fission reaction how is

Electricity produced

Answer 4

Heat energy produced by fission is removed by coolant which passes its energy to water through a heat exchanger producing steam to drive the turbines which turns electricity producing generators.

Question 5

In fusion how is

Electricity produced

Answer 5

Most (80%) of the energy produced in fusion is carried away by a neutron with no electrical charge. The neutrons are absorbed into the surrounding walls and their kinetic energy is turned to heat. This is captured by cooling water circulating in the walls which then produces steam and goes on to spin a turbine.