ENS



 

Excess reactivity

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Higher reactivity value than required to achieve criticality of a reactor. Provision is made for excess reactivity in the loading of a reactor with fuel elements to balance burnup and the accumulation of fission product poisons during operation. The excess reactivity existing in a freshly loaded reactor is balanced by the position of shim and control rods or by adding boron to the reactor coolant.

 

 

 


 

 


 

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