Preliminary results for the lifetime of two DEMO blanket designs
Thermal-structural calculations are performed and the results used to predict the lifetime of two fusion power plant first wall concepts in a parametric exploration of the effects of conceivable loading events. The calculations show that the zero-fatigue lifetime (creep damage only) is 2.52 years for the helium and 2.82 years for the water cooled concepts respectively. As the operational temperature increases, the structure becomes more susceptible to fatigue. In general all cumulative damage mechanisms examined in this study exhibit a dampened behaviour as the operational temperature decreases. From the structural point of view, the major concern of operating at lower temperatures is that martensitic steel at several locations around the machine is going to be near its ductility limit. Also, results show that the bulk of the cumulative damage is due to the power-on period. Lifetime improvement is possible if the time to failure at the full power-on stress level can be extended. This can be achieved through geometrical shape optimization for minimizing the stress level at the critical points of the component.
Bibliographic Reference: Report: UKAEA FUS 367 EN (1997) 14 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon, OX14 3DB (GB)
Record Number: 199711284 / Last updated on: 1997-10-10
Original language: en
Available languages: en