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In the Phebus facility non-destructive examinations are being developed, with special emphasis on transmission tomography, using a linear accelerator association with a line scan camera based on polycrystalline diamond (PCD) components. This particular technique enabled the high level of penetration to be obtained, necessary for this high density application. Spatial resolution is not far from the theoretical limit and the density resolution is often adequate.
However, classical cuttings, periscopic visual examinations, macrographies, micrographies and electron probe microanalysis (EPMA) analyses remain essential to give oxidation levels (in the less degraded zones), phase aspect and compositon, to distinguish between mateirals of identitical density, and, if possible, to estimate temperatures. EPMA gives access to material chemical analyses, especially in the molten fuel blockage area

Additional information

Authors: BLANC J Y, CEA, CEN Saclay, Gif-sur-Yvette (FR);CLÉMENT B, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);VON DER HARDT P, JRC Ispra (IT)
Bibliographic Reference: Paper presented: IAEA Technical Committee Meeting on the Behaviour of LWR Core Materials under Accident Conditions, Dimitrovgrad (SU), October 8-13, 1995
Availability: Available from (1) as Paper EN 39787 ORA
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