Study of alloy sbn after 30 years operating in structure absorbed assembles of VK-50 nucliar reactor

The article describes research SBN alloy samples made ​​from parts of absorbed assemblies. The combined use of metallography, X-ray diffraction, scanning and transmission electron microscopy allowed us to obtain sufficiently complete information about the changes that have occurred as a result of long-term radiation-thermal effects. The measurements of microhardness and density of the samples carred out. In addition the behavior of accumulated transmutation helium in samples was study after annealed at 800 0C.