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Cyclic secondary stresses produced by pulsed heat load in the first wall of the Next Step fusion reactors are one of the main limiting factors for the lifetime of such components. Since these thermal stresses are caused by a time dependent temperature gradient, they cannot be studied by conventional thermal-mechanical fatigue experiments but must be produced by suitable facilities; their spatial distribution in first wall mock-ups or components must then be investigated with special regard to the regions close to brazings or welds, coolant channels or other structural inhomogeneities. The residual strains in an AISI 316L first wall mock-up, submitted to thermal fatigue, were investigated by neutron diffraction. Preliminary results are presented referring to the strain gradient detected in the vicinity of the coolant channels.

Additional information

Authors: ALBERTINI G, Università Ancona, Dipartimento di Scienze dei Materiali e della Terra (IT);CERETTI M ET AL., Università Ancona, Istituto di Scienze Fisiche (IT);LODINI A ET AL, Laboratoire Léon-Brillouin, Saclay (FR);COPPOLA R, ENEA-Casaccia, Roma (IT);JAKEMAN R R, NET Team, Garching (DE);VIEIDER G, NET Team, Garching (DE);MATERA R, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 17th Symposium on Fusion Technology, Roma (IT), September 14-18, 1992
Availability: Available from (1) as Paper EN 37220 ORA
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