Izvestiya vuzov. Yadernaya Energetika

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

The Possibility of Target Modification for 99Mo Production in the VVR-ts

12/10/2025 2025 - #04 Application of nuclear tech

Kochnov O.Yu. Kolesov V.V.

DOI: https://doi.org/10.26583/npe.2025.4.15

UDC: 621.039

The article presents the results of neutron physics calculations in support of the possibility of upgrading the block container for the production of 99Mo isotope at the VVR-tc reactor. Two options for upgrading the target are being considered. It is proposed to modernize the inner part of the targets by adding an additional element with an air cavity on top to compensate for the pressure of radiation noble gases (RBG) and other volatile fission products formed during irradiation. The considered models allow us to technically implement both options. The targets are placed in an experimental loop channel with forced cooling with desalinated water. At the same time, the coolant flow washes both the internal and external elements. In this case, the optimal target irradiation time is set at the nominal reactor power level. Neutron flux densities and energy release in existing and proposed modernization targets are compared. Both proposed designs of the internal element lead to an increase in the operating time of the aim radionuclide 99Mo. The results show that using a modernized block container, a 99Mo load increase of up to 10% can be achieved. The calculations were performed using the MCNP-5 program. Thus, it is possible to reduce the cost of socially significant medical products for the diagnosis of oncological diseases. However, an increase in energy release requires additional thermohydraulic calculations to justify its safe use in conditions of a possible increase in water temperature and, as a result, deterioration of the heat sink. Strength calculations are also needed to confirm the integrity of the structure during the reactor campaign.

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research reactor VVR-ts experimental channel MAK-2 99Mo production

Link for citing the article: Kochnov O.Yu., Kolesov V.V. The Possibility of Target Modification for 99Mo Production in the VVR-ts. Izvestiya vuzov. Yadernaya Energetika. 2025, no. 4, pp. 200-206; DOI: https://doi.org/10.26583/npe.2025.4.15 (in Russian).

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