Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Influence of different types of reflectors on 99Mo production in VVR-ts’ targets

3/19/2020 2020 - #01 Physics and technology of nuclear reactors

Kochnov O.Yu. Danilov P.A.

DOI: https://doi.org/10.26583/npe.2020.1.05

UDC: 621.039.51

The analysis of placement effectiveness for various types of reflectors in the core of the VVR-ts reactor for the production of 99Mo is carried out. Earlier, a calculation was made of the effect of only a beryllium reflector on the characteristics of the VVR-ts reactor core such as reactivity margin, neutron flux in experimental channels, and accumulated activity of 99Mo. The calculations are based on the formed precision model of the core, which includes one experimental channel, where the targets for 99Mo production are irradiated. The model was created in the SCALE software package. The software package allows a fairly wide range of calculations to be carried out, from criticality assessment to the tasks of assessing the radiation situation.

As a result of the computational analysis of the model, such characteristics were obtained as the effective multiplication factor, energy release in the targets for 99Mo generation, the neutron flux in the target raw material, and the amount of 99Mo generated after 120 hours of irradiation. The data were compared with the results of similar calculations of the parameters of the core of the VVR-ts reactor. Further, on the basis of reference literature, a list of widely used materials as a reflector or moderator in the reactor core was formed. Based on it, several models were formed and analyzed in which the water space at the periphery of the core was replaced with the researched materials. The calculation results showed that the maximum production of 99Mo is achieved when placing a beryllium reflector. Placement of other types of reflectors does not significantly increase production compared to an already placed water reflector.

References

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VVR-ts reactor reflector 99Mo production neutron flux power density SCALE software package