The controlled release of nuclear energy in a reactor is accomplished by: allowing the critical mass of fuel to react controlling a chain reaction controlling fission without a chain reaction confining a spontaneous chain reaction to within a reactor container

(1) Answers

If a chain reaction takes place, the amount of energy released would increase exponentially, so in order to control the energy release, fission must be controlled without controlling a chain reaction, so the third option is correct. Hope this helps!

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