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This work deals with the design of a fusion reactor first-wall material, taking into account both low-activation and thermal-mechanical properties. The concept of low activation is discussed in detail, and a new definition is proposed that takes into account not only waste-related problems, but also maintenance and accident scenarios. The results of a thermal mechanical analysis of some proposed materials, performed in a demonstration reactor under operating conditions, are presented. Among the austenitic stainless steels, VA64 has proved to be the most effective material as far as thermal stress is concerned. The maximum von Mises tensile stress is below the elastic limit. The radioactivity induced in VA64 alloy is analysed. The long-term activity does not satisfy the stated limits, so that the technique of elemental substitution in steels has to be used. A low-activation version of VA64 (named VA64LA) is proposed that is formed by removing the niobium content and replacing it with titanium. This new alloy has been analysed with regard to each characteristic required for a first-wall material, and it has proved to be a promising austenitic steel for fusion reactor application.

Additional information

Authors: MEROLA M, JRC Ispra (IT);ZUCCHETTI M, Politecnico di Torino, Dipartimento di Energetica (IT)
Bibliographic Reference: Article: Fusion Technology, Vol. 21 (1992) pp. 129-141
Record Number: 199210486 / Last updated on: 1994-12-02
Original language: en
Available languages: en