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In this work, the main problems concerning the design of the Next Step fusion reactor first wall are analysed. The particular operating scenario in which this component will work asks for a standard code to be able to give precise rules to the designer. The working environment of the experimental machine ITER/NET and the different one of the demonstration reactor, implies a double effort in the research activity. As far as the Next Step machine is concerned, great attention should be paid to the thermal fatigue phenomenon and to its possible synergistic effects with plasma disruptions and irradiation creep. On the other hand, a commercial reactor requires the development of an advanced material which is proof against the extremely high irradiation and thermal loads and which satisfies the chosen criteria of low activation.

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Authors: MEROLA M, JRC Ispra (IT);MATERA R, JRC Ispra (IT)
Bibliographic Reference: Article: Energia Nucleare, Vol. 8 (1991) No. 1, pp. 42-54
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