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Conference Article: Preliminary study on the development of an in-service inspection technique for graphite components in the HTTR

Abstract

Development of a nondestructive measuring method on a residual strain and/or stress accumulating in the graphite component is one of major research subjects in the HTTR. For the purpose of the development of the method deformation characteristic under a small magnitude of a pressure load was measured using graphite specimens on which several levels of residual strains were produced. The pressure load was applied using a microhardness testing machine. In the experiment indentation load to depth characteristic and a microhardness were measured as a function of the residual strain. In this paper we describe the deformation characteristic influenced by the residual strain, and discuss the applicability of the micro-indentation method to the estimation of the residual strain arising in graphite components as an inservice inspection technique.

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Reference:

Technical committee meeting on high temperature gas cooled reactor technology development. Johannesburg (South Africa). 13-15 Nov 1996.

International Atomic Energy Agency, Vienna (Austria)

IAEA-TECDOC--988, pp:443-452