Validation of the updated decay data libraries of the ANITA-2000 activation code package on experimental data produced by FNS-JAERI

ANITA-2000 is a code package for the activation characterization of materials exposed to neutron irradiation released by ENEA to OECD-NEADB (NEA-1638) and ORNL-RSICC (CCC-693). The package contains: a) the activation code ANITA-4M, based on the original code developed at CEC JRC Ispra, able to compute the radioactive inventory of a material exposed to neutron irradiation, continuous or stepwise, b) two activation cross section libraries, c) the decay data library (file “fl1”) containing the quantities describing the decay properties of unstable nuclides and d) the library (file “fl2”) containing the gamma ray spectra emitted by the radioactive nuclei in the ORNL-SCALE 18- energy group structure. The data contained in the “fl1” and “fl2” libraries of the ANITA-2000 code package have been recently updated on the basis of the JEFF-3.1.1 Radioactive Decay Data Library. The present report summarises the results of the validation of the updated decay data libraries, using the ANITA-4M code, through the comparison with the decay heat experimental results related to the material samples irradiated in the 14 MeV neutron flux of the Fusion Neutronics Source (FNS), JAERI (Japan Atomic Energy Research Institute, actually JAEA), Tokai, Japan.