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The displacement and gaseous atom production rate is calculated for fast neutrons and for the primary nuclear reactions Be9 (n, 2n) 2He4 and Be9 (n, α) He6 for beryllium in a lattice piece in the Materials Testing Reactor (MTR). The results of compression tests on samples cut from lattice piece LB-15 are given. Electron microscope fractographs are presented which show gas bubble growth only at the higher exposures. X ray diffraction patterns indicate no change in hexagonal line patterns and lattice parameter changes of less than 0.2 per cent for the higher exposures, 1.45 × 1022 neutrons/cm2. The bowing of the MTR lattice pieces is analyzed in terms of the presence of the gaseous atoms, and the fracture of MTR lattice pieces and compression samples is examined in relation to fracture criteria. The strain corresponds to a growth of about 0.2 per cent per 1 × 1022 nvt > 1 Mev.
, J. M.
Chief, Phillips Petroleum Co., Idaho Falls, Idaho