Design issues and implications for the structural integrity and lifetime of fusion power plant components
This review discusses, with example calculations, the criteria, and imposed constraints and limitations, for the design of fusion components and assesses the implications for successful design and power plant operation. The various loading conditions encountered during the operation of a tokamak lead to structural damage and possible failure by such mechanisms as yielding, thermal creep rupture and fatigue due to thermal cycling, plastic strain cycling (ratcheting), crack growth-propagation and radiation induced swelling and creep. Of all the possible damage mechanisms, fatigue, creep and their combination are the most important in the structural design and lifetime of fusion power plant components operating under steady or load varying conditions. The effect of neutron damage inflicted onto the structural materials and the degradation of key properties, is of major concern in the design and lifetime prediction of components. Structures are classified by, and will be restricted by existing or future design codes relevant to medium and high temperature power plant environments. The ways in which existing design codes might be used in present and near future design activities, and the implications, are discussed. The desirability of an early start towards the development of fusion-specific design codes is emphasised.
Bibliographic Reference: Article: UKAEA FUS 335 (1996) 23pp.
Record Number: 199611237 / Last updated on: 1996-11-11
Original language: en
Available languages: en