Decay and Monte Carlo criticality calculations verified for long term waste disposal.
OECD/NEA Burn-up Credit Criticality Safety Benchmark Phase VII considered.
Codes employed CINDER, SERPENT, MCNP6 and data from ENDF, JEFF and TENDL.
Decay data from JEFF-3.1.1 is adequate compared to ENDF/B-VII.1.
Discrepancies shown comparing ENDF/B-VII.1 cross sections to JEFF-3.2 and TENDL-2014.