WIMS Library Update Project 


WIMSD5B
updates




The newly developed library has an increased number of isotopes, much more resonance nuclides and exists in two versions: with 69 and 172 library groups. The standard WIMSD code in all its versions, including the last one WIMSD5B, has been developed for a library with maximum number of 69 groups. Although the number of library groups used in WIMSD calculations is read from that library, there exists a set of auxiliary arrays in the code with dimensions established assuming usage of 69group library. There exist also arrays with dimensions depending on the number of fast, resonance and thermal groups which also had to be revised. A similar situation existed with the total number of isotopes, the number of resonance nuclides, the number of fissionable isotopes and the number of fission products which are also read from the library. All of them, although formally taking the library values, are used in the particular subroutines in an indirect way. The main
updates developed on the frame of WLUP to overcome the problems mentioned
above were: 2. Updating
the WIMSD5B code to allow the use of the 172 group library. It required
the extension of the number of groups, as well as the number of resonance
groups. These values are set to 200 and 55 groups respectively. The use
of the 172 energy groups implies that the higher energy limit is set now
about 20 MeV. 5.
Some constants built into the code were updated as the Avogadro number
and the default tolerance amongs others. 



