Nuclear Reactor Analysis
by James J. Duderstadt, Louis J. Hamilton · University of Michigan Deep Blue
The standard graduate text on reactor physics, free in full from Michigan's institutional repository. Covers neutron transport, multigroup diffusion, criticality, reactor kinetics and core design, so you can set up and solve core-analysis problems yourself. Repeatedly named the best reactor-physics text; its multigroup diffusion and neutron-transport treatment is the benchmark.
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