Neutronics Analysis of the Fuel-assembly-bowing Effect in Pressurized Water Reactor
In pressurized water reactors,fuel assemblies are subjected to axial compression and lateral forces,as well as high neutron flux,which result in various forms of assembly deformation and rod bending.Assembly deformation affects the local moderation effect,thereby affecting the neutronics parameters and the safety margin of the core.In this study,based on the measurement data,core neutron calculation models with different deformation and bending effects are established to analyze the changes of local moderation effects caused by deformation and the influence on core power distribution.At the same time,the effect of deformation under different reflector designs is also evaluated.The results show that the deformation has an impact on the power distribution,and the effect will be more significant for the heavy-reflector design.
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