  MCNP6 has been Validated and Verified (V&V) against intermediate- and
high-energy fission cross-section experimental data. An error in the
calculation of fission cross sections of 181Ta and a few nearby target nuclei
by the CEM03.03 event generator in MCNP6 and a "bug: in the calculation of
fission cross sections with the GENXS option of MCNP6 while using the
LAQGSM03.03 event generator were detected during our V&V work. After fixing
both problems, we find that MCNP6 using CEM03.03 and LAQGSM03.03 calculates
fission cross sections in good agreement with available experimental data for
reactions induced by nucleons, pions, and photons on both subactinide and
actinide nuclei at incident energies from several tens of MeV to about 1 TeV.
