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In a nuclear reactor, self-sustained chain reaction is possible, because
1. More neutrons are released in each of the fission reactions.
2. The neutrons immediately take part in fission process.
3. The fast neutrons are slowed down by graphite.
4. Every neutron released in the fission reaction initiates further fission.
1, 2 and 3
1 and 3
2 and 4
2, 3 and 4
Free neutrons, in particular from spontaneous fissions, can cause the device to undergo a preliminary chain reaction that destroys the fissile material before it is ready to produce a large explosion, which is known as predetonation.
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