ENEA-Bologna Multi-Group Cross Section Libraries for LWR Shielding and Pressure Vessel Dosimetry Applications

The ENEA-Bologna Nuclear Data Group produced two multi-group cross section libraries for nuclear fission applications, named VITJEFF311.BOLIB and BUGJEFF311.BOLIB. VITJEFF311.BOLIB is a fine-group coupled neutron/photon general-purpose library in AMPX format, based on the JEFF-3.1.1 evaluated nuclear data library and the Bondarenko (f-factor) neutron resonance self-shielding method. VITJEFF311.BOLIB was generated through the NJOY -99.259 nuclear data processing system in the neutron and photon energy group structures (199 n + 42γ ) of the VITAMIN-B6 similar library produced at ORNL. BUGJEFF311.BOLIB is a broad-group coupled neutron/photon working cross section library in FIDO-ANISN format, specifically dedicated to LWR shielding and pressure vessel dosimetry applications. It was generated in the same neutron and photon energy group structures (47 n + 20 γ) as the ORNL BUGLE-96 similar library, through problern-dependent cross section collapsing of the VITJEFF311.BOLIB library, performed with the updated and corrected ENEA-Bologna 2007 Revision of the ORNL SCAMPI nuclear data processing system. BUGJEFF311.BOLIB was tested on the PCA-Replica 12/13 and VENUS-3 engineering neutron shielding benchmark experiments (included in the SINBAD database), specifically conceived to check the nuclear data and the transport codes used in LWR radiation shielding and radiation damage analyses, through three-dimensional fixed source transport calculations with the TORT-3.2 discrete ordinates (SN) code. BUGJEFF311.BOLIB was recently transferred to OECD-NEA Data Bank and is freely distributed with the designation NEA-1866/01 ZZ-BUGJEFF311.BOLIB.