A nuclear unit becoming critical means

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RRB Paper · Accepted Answer

A nuclear unit becoming critical means when a chain reaction that causes the automatic splitting of the fuel nuclei has been established. The reactor core must be designed so that the mass of fuel will be just sufficient to ensure one neutron from each fission causing fission in another atom. A mass and configuration of fissionable material in which this occurs are termed the ‘critical mass’, or reactor in which this condition is achieved is said to have ‘gone critical’. Criticality is the normal operating condition of a nuclear reactor, in which nuclear fuel sustains a fission chain reaction. A reactor achieves criticality (and is said to be critical) when each fission releases a sufficient number of neutrons to sustain an ongoing series of nuclear reactions.

A nuclear unit becoming critical means

It is generating power to rated capacity

It is capable of generating much more than rated capacity

There is danger of nuclear spread

Chain reaction that causes automatic splitting of the fuel nuclei has been established

The correct answer is `No. 4: Chain reaction that causes automatic splitting of the fuel nuclei has been established`

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A nuclear unit becoming critical means

It is generating power to rated capacity

It is capable of generating much more than rated capacity

There is danger of nuclear spread

Chain reaction that causes automatic splitting of the fuel nuclei has been established

The correct answer is No. 4: Chain reaction that causes automatic splitting of the fuel nuclei has been established

The correct answer is `No. 4: Chain reaction that causes automatic splitting of the fuel nuclei has been established`