DEVELOPMENT OF THE DESIGN OF THE IRRADIATION DEVICE FOR CARRYING OUT IN-REAKER TESTS OF ABSORBING MATERIALS OF THE CONTROL BODIES OF NUCLEAR REACTORS

JSC «SSC RIAR» is developing a design of an irradiation device (ED) for in-reactor tests of absorbing materials of nuclear reactor control bodies. Dysprosium titanate was chosen as the absorbing material because this compound has high chemical and thermal stability, increased corrosion and radiation resistance. The structure of the DT consists of a suspension with a flange, a working section, in which the sample with the absorbing material is placed, a flow splitter and an absorbing screen. The flow divider is made of 12X18H10T steel. The absorbing screen, designed to reduce the fraction of thermal neutrons in the spectrum, consists of two cylinders made of boron steel and aluminum, goggled by 12X18H10T steel. In the course of the work, neutron-physical calculations obtained with the MCU-FR code and thermal hydraulic calculations of the SE structure obtained with the SolidWorks PC were performed. Neutron-physical calculations showed that the use of boron steel and aluminum shields allows correcting the ratio of fast and thermal neutron flux during in-reactor tests of absorbing materials.

The results of thermal-hydraulic calculations have shown that the required temperature regime of irradiation of the sample with absorbing material made of dysprosium titanate in the third row of the SM-3 reactor reflector is provided under the conditions of forced circulation.

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