## An analysis of the accuracy of perturbation theory |

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above-thermal group absorption cross section accuracy of two-group actual changes adjoint-flux distribution Akeff basic constants change in composition core or reflector cylindrical model diffusion coefficient discusses the accuracy effect on reactivity energy above thermal establishes the importance express reactivity change fast neutrons Fermi age theory fictitious change fission cross section flector flux distribution gives the increase graphs increase in reactivity inside the integral integral by establishes integral by Q keff last in experimental leakage localized and non-uniform macroscopic absorption cross macroscopic fission cross MTR Reactivity Measurement multiplied inside negative for positive non-uniform changes percentage change pile period Practical Reactor Theory radial rdr gives Reactivity Measurement Facility reactivity of small reactor chosen reflected MTR Reactivity reflector changes standard group theory standard two-group theory thermal group thermal neutron third in perturbation two-group perturbation theory uniform changes volume element water reflected MTR