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The electrical output of the plant is accurately and continuously measured by normal electrical equipment. To get the nuclear reactor thermal output, it is basically necessary to know the coolant flow rate and the temperature rise. In a BWR you would also need to know the steam content of the reactor outlet. These calculations would not be done frequently but would be done at intervals to check the plant efficiency. An approximate indication of reactor power can be obtained from neutron flux measurement directly, but this is used to help the operators rather than for an accurate power measurement, because there are variations in instrument sensitivity as well as in the flux distribution in the core.

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