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[en] Interactions between volatile fission products (e.g. iodine, tellurium, etc.) and the fuel cladding have been observed in a number of reactor systems. To determine the effect of iodine or tellurium on the mechanical properties of the 20Cr-25Ni-Nb steel used as fuel cladding in UK advanced gas-cooled reactors, stress rupture tests have been performed in environments of dynamic vacuum, iodine vapour and tellurium vapour under initial stresses of 47 to 130 MN/m2 at 7500C. Both iodine and tellurium vapours promoted surface nucleated, intergranular cracking which significantly reduced the specimen rupture life and strain at fracture compared with tests in vacuum. An increase in the iodine vapour pressure from 0.04 to 56 mbar resulted in further embrittlement. Examination of the surface regions of a specimen after long-term exposure to iodine vapour revealed a porous, duplex scale and significant depletion of chromium from the metal associated with subsurface void formation. Embrittlement mechanisms are discussed. (author)
Source
Harris, J.E.; Sykes, E.C. (Central Electricity Generating Board, Berkeley (UK). Berkeley Nuclear Labs.) (eds.); p. 27-32; ISBN 0900497971; 
; 1975; Metals Society; London; International conference on the physical metallurgy of reactor fuel elements; Berkeley, UK; 2 Sep 1973
; 1975; Metals Society; London; International conference on the physical metallurgy of reactor fuel elements; Berkeley, UK; 2 Sep 1973