3. DESCRIPTION OF PROGRAM OR FUNCTION
MONTEBURNS Version 2 calculates coupled neutronic/isotopic results for nuclear systems and produces a large number of criticality and burnup results based on various material feed/removal specifications, power(s), and time intervals. MONTEBURNS is a fully automated tool that links the LANL MCNP Monte Carlo transport code with a radioactive decay and burnup code. Highlights on changes to Version 2 are listed in the transmittal letter. Along with other minor improvements in MONTEBURNS Version 2, the option was added to use CINDER90 instead of ORIGEN2 as the depletion/decay part of the system. CINDER90 is a multi-group depletion code developed at LANL and is not currently available from RSICC, nor from the NEA Databank. This MONTEBURNS release was tested with various combinations of CCC-715/MCNPX 2.4.0, CCC-710/MCNP5, CCC-700/MCNP4C, CCC-371/ORIGEN2.2, ORIGEN2.1 and CINDER90. Perl is required software and is not included in this distribution. MCNP, ORIGEN2, and CINDER90 are not included.
The following changes have been made:
1) An increase in the number of removal group information that must be provided for each material in each step in the feed input file.
2) The capability to use CINDER90 instead of ORIGEN2.1 as the depletion/decay part of the code.
3) ORIGEN2.2 can also be used instead of ORIGEN2.1 in Monteburns.
4) The correction of including the capture cross sections to metastable as well as ground states if applicable for an isotope (i.e. Am-241 and Am-243 in particular).
5) The ability to use a MCNP input file that has a title card starting with 'm' (this was a bug in the first version of Monteburns).
6) A decrease in run time for cases involving decay-only steps (power of 0.0). Monteburns does not run MCNP to calculate cross sections for a step unless it is an irradiation step.
7) The ability to change the cross section libraries used each step. If different cross section libraries are desired for multiple steps.
8) Minor corrections to the output file.