Burn-up calculations with the MCNP code are based on the cinder.dat library, which includes the information of the cross-sections, the fission product yields and the decay data necessary to perform the depletion (among others). This library is based mainly on ENDF/B-Ⅵ.0 and has been enhanced with other databases, but no version based on other libraries (like JEFF or JENDL) is available in the bibliography or supplied with the MCNP code. This creates an inconsistency when other libraries are used for transport since the information of different libraries is mixed in the bum-up process. This study aims to evaluate the impact of the use of the cinder.dat library when other libraries are desired for transport and of the full replacement of the library file. In this paper, a new library has been developed and proposed to replace cinder.dat when coherent calculations using JEFF-3.3 for transport and burn-up are desired.
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