Fission and fusion

In a nuclear reactor, a Plutonium-239 nucleus absorbs a neutron and nuclear fission occurs.

Complete the nuclear equation below by finding the values of the missing numbers $A$ and $B$ .

^{239}_{94}\text{Pu} + ^{1}_{0}\text{n} \rightarrow \ ^{134}_{A}\text{Xe} + \ ^{B}_{40}\text{Zr} + 3\ ^{1}_{0}\text{n}

[2]

Explain how the fission of one Plutonium-239 nucleus can lead to a sustained chain reaction.

[3]

The diagram below shows a simplified schematic of a nuclear reactor vessel.

Nuclear reactor schematic

State the names of the parts labeled X and Y.

[2]

Describe the function of part Y in controlling the rate of fission in the reactor.

[2]

Explain why part X is necessary for safety.

[2]

Fission and fusion Questions