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Risovany V.D.,Joint Stock Company State Scientific Center Research Institute of Atomic Reactors RIAR | Prokhorov V.I.,Joint Stock Company State Scientific Center Research Institute of Atomic Reactors RIAR | Ostrovsky Z.E.,Joint Stock Company State Scientific Center Research Institute of Atomic Reactors RIAR | Pimenov V.V.,Joint Stock Company State Scientific Center Research Institute of Atomic Reactors RIAR | And 2 more authors.
Journal of Nuclear Materials | Year: 2010

Hafnium control rods in the form of plates 6 mm thick were examined after a 9-year operation in the RBT-6 research reactor in water coolant at 68-86 ° to a maximal fluence 7.5 × 10 25 m -2 (< 0.625 eV) and 2.4 × 10 25 m -2 (E > 0.8 MeV). The Hf crystalline lattice volume increased by 0.4% and its density decreased. The oxide film thickness did not exceed 1 μm. Linear-type a-dislocations with a concentration of (5 ± 2) × 10 13 m -2 were found in the structure as well as fine precipitates, where iron and chromium were detected, in addition to hafnium. Hf strength changed insignificantly; the material preserved its plasticity at a level of 8-15%. The performed examinations allowed the prolongation of the control rod design operation for up to 20 years. © 2010 Elsevier B.V. All rights reserved. Source

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