A modified version of CENDL-2, i. e. CENDL-2.1 was completed and released in 1995. The library contains evaluations of neutron reaction data for 68 elements or isotopes from ~1H to ~(249)Cf in the neutron energy range from 10~(-5) eV to 20 MeV. Compared to CENDL-2, the size of the library has been increased significantly, the modifications have been made to most materials, so the accu A modified version of CENDL-2, ie CENDL-2.1 was completed and released in 1995. The library contains evaluations of neutron reaction data for 68 elements or isotopes from ~ 1H to 249 Cf in the neutron energy range from 10 to -5) eV to 20 MeV. Compared to CENDL-2, the size of the library has been increased significantly, the modifications have been made to most materials, so the accu