Nuclear fission can be controlled.
An example of a way that nuclear fission is controlled is in a nuclear reactor such as at a power plant that uses nuclear fission to heat water to create steam to turn a generator and make electricity.
The nuclear fission is controlled using control rods and moderators within the nuclear reactors.
These tools regulate the chain reaction of nuclear fission and allow for the sustained and controlled release of energy, which is then harnessed to produce electricity.
Control rods for nuclear fission are rods that are made of materials that absorb the neutrons, which are essential for sustaining the fission chain reaction.
And by inserting or withdrawing the control rods, operators can then adjust the rate of fission and slow it down or speed it up as needed.
Moderators such as graphite or water also slow down the neutrons that are released during fission, making them more likely to induce further fission, thereby sustaining the chain reaction.
Nuclear reactors are designed with the control mechanisms to allow for the safe and controlled fission.
They also separate the fissionable material to prevent critical mass, and use various systems to control neutron flux and absorption and allow for the reactor to be shut down.
And in a controlled chain reaction, the number of the neutrons that are released by fission is carefully regulated, ensuring that each fission event leads to another but not so many that the reaction becomes uncontrollable.
This is crucial for preventing explosions within the nuclear reactor and also ensuring safe generation of power.