05/00633 Failure predictions for nuclear graphite using a continuum damage mechanics model

Abstract

The JAERI/USDOE Collaborative Program on Fusion Blanket Neutronics started officially on October 23, 1984 using the intense D-T neutron generator FNS and was concluded in 1993. The program was divided into three phases. The Phase I series was planned for engineering-oriented benchmark experiments and measuring technique development. The Phase II series was characterized by a closed geometry with a slab-type test blanket and the neutron source surrounded by a reflecting enclosure. The experiments provided extensive data on the breeding characteristics of Li2O and the beryllium neutron multiplication effect in different configurations. The Phase III series was planned to simulate the fusion reactor as practically as possible using a point neutron source. The combination of a pseudo-line source and annular test blanket on the deck can simulate part of tokamak geometry as cylindrical geometry. Since 1988, integral experiments on induced radioactivity and nuclear heating have also been performed under the Collaboration Program. Both Japan and the US have analyzed these benchmark experiments using the latest and/or newly developed data and methods. A novel methodology has been developed to estimate design safety factors and the associated confidence levels.