Eta (Reproduction Factor) Impact of Fuel Leg Change

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SUMMARY

The discussion centers on the impact of changing the fuel leg from maximum yield on the eta (Reproduction Factor) in nuclear reactions. It is established that eta decreases due to neutron energy spectral effects and temperature variations. Specifically, as the velocity (v) of neutrons increases, the fission cross-section declines while absorption increases, influenced by resonance absorption. The analysis emphasizes the importance of considering both fissile and fertile species, as well as the materials and coolant involved in the process.

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why does eta(Reproduction Factor) fall down when we change fuel leg from maximum level of yield?
 
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ms.shafeie said:
why does eta(Reproduction Factor) fall down when we change fuel leg from maximum level of yield?
I don't quite follow the question, specifically the part "when we change fuel leg from maximum level of yield". Please elaborate on this statement.

η = Ʃi (vi Ʃf,i) / Ʃa, where Ʃa is the weighted sum of the macroscopic absorption cross-section of the fuel material mixture. The index i refers to the fissile (and fertile) species. Fertile nuclides fission mainly with fast neutrons.

There are neutron energy spectral effects and temperature effects. If v (nu) increases, the fission cross-section decreases and the absorption increases (due to increased resonance absorption). One has to look at the fissile and fertile species, as well as other materials and coolant.
 
thanks a lot for ur good respond to my question.ur suggetion is right and I try to solve my problem in asking questions.
 

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