Analysis and intercomparison for phase I experiments at FNS

The phase I integral experiments of the Japan Atomic Energy Research Institute (JAERI)/US collaborative program on fusion breeder neutronics, which were carried out at the Fusion Neutron Source (FNS) Facility at JAERI, ranged from a deuterium-tritium neutron source characterization experiment, tritium production rate (TPR) measurements in a reference Li/sub 2/O assembly, first-wall experiments with an without coolant stimulation, and beryllium neutron multiplier experiments in various configurations. The phase II experiments of the program are planned to be carried out during FY1986-1987 when the system specifications (geometrical arrangement, material selection, etc.) are chosen to give closer simulation to the fusion reactor environment (spectra). Both the US and JAERI have independently analyzed phase I experiments using their own data bases and codes. Analytical predictions obtained by both countries were compared to measured values. The main objective of the intercomparison is to determine the accuracy, guide the development, and establish the validity of present computational methods and nuclear data bases in predicting key fusion blanket design parameters (e.g., TPR, heating rate, etc.) and to evaluate the overall uncertainties (both analytical and experimental) associated with these parameters.