V. S. Neustroev and V. K. Shamardin
Research Institute of Nuclear Reactors, Dimitrovgrad, Ul’yanovsk Oblast, 433510 Russia
Received October 22, 1996
Abstract—Recent studies into the various aspects of medium-temperature radiation embrittlement are summed
up. The key aspects of the phenomenon are noted. Microstructural parameters are identified and their critical
values are determined. This helps explain why exposure to high-dose damaging neutron irradiation causes
changes in the mechanical properties of structural materials in the core of fast-neutron reactors. The mechanism
is discussed whereby easier conditions are created for the initiation and propagation of microcracks in materials
containing pores and second-phase particles.
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