  Neutron reaction data for the set of major chromium isotopes were reevaluated
from the thermal energy range up to 20 MeV. In the low energy region, updates
to the thermal values together with an improved $R$-matrix analysis of the
resonance parameters characterizing the cluster of large $s$-wave resonances
for $^{50,53}$Cr isotopes were performed. In the intermediate and high energy
range up to 20 MeV, the evaluation methodology used statistical nuclear
reaction models implemented in the EMPIRE code within the Hauser-Feshbach
framework to evaluate the reaction cross sections and angular distributions.
Exceptionally, experimental data were used to evaluate relevant cross sections
above the resonance region up to 5 MeV in the major $^{52}$Cr isotope.
Evaluations were benchmarked with Monte Carlo simulations of a small suite of
critical assemblies highly sensitive to Chromium data, and with the Oktavian
shielding benchmark to judge deep penetration performance with a 14-MeV D-T
neutron source. A significant improvement in performance is demonstrated
compared to existing evaluations.
