Q.Describe the principles of a nuclear reactor. What is the difference between a nuclear reactor and a nuclear bomb?

[!TLDR] A nuclear reactor is a fission chain reaction deliberately kept CONTROLLED (moderated/regulated) so energy is released steadily as heat, converted to electricity via turbines; a nuclear bomb is the SAME chain reaction left completely UNCONTROLLED, releasing its energy explosively in a very short time. [!ANSWER] Reactor = controll …

A nuclear reactor works by carrying out nuclear fission in a deliberately CONTROLLED manner. Typically fuelled by $^{235}U$, which absorbs slow neutrons to form the unstable compound nucleus $^{236}U$ that undergoes fission, releasing on average about 2.7 neutrons per fission along with a large amount of energy (heat). Since each fission event releases more neutrons than it consumed, left unchecked this would grow into a runaway chain reaction; a reactor instead uses control mechanisms (absorbing or moderating materials) to keep the rate of fission steady rather than growing, so that energy is released as heat at a controlled, continuous, manageable rate. This heat is then carried away and used to generate steam that drives turbines, producing electricity -- functionally similar to a conventional power plant, but with a nuclear rather than chemical heat source. A nuclear bomb (or nuclear device) exploits exactly the SAME underlying fission chain reaction, but with all control mechanisms deliberately absent -- the chain reaction is allowed to grow explosively and uncontrolled, so that an enormous amount of energy, comparable to what a reactor might release over a long period, …

Describe the fission chain-reaction mechanism common to both, then contrast the presence (reactor) versus absence (b …

Describing a reactor and a bomb as using fundamentally different nuclear processes, rather than recognising both rely on the identical chain-reaction mechan …