Abstract
The 59Ni isotopic tailoring experiment conducted in the Fast Flux Test Facility (FFTF) to study the effects of helium on the radiation-induced evolution of microstructure and mechanical properties of austenitic steels has been assessed. The experiment has been judged to be very successful in reaching its objectives, and guidelines are presented to aid in planning similar experiments. Conducting such experiments successfully requires etching the surface regions of specimens before measuring the helium. Attempts to calculate in advance the helium dpa ratio resulted in 20 to 40% underestimates of the measured levels. These underestimates appear to arise from uncertainties in the near-edge and out-of-core regions of both the neutron flux spectra and the neutron cross sections for 59Ni in the epithermal energy region.
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