Abstract
The article presents the results of studies to justify the project for decommissioning the IGR reactor facility. Based on the results of a comprehensive engineering and radiation survey, the IGR reactor system boundaries to be decommissioned were determined, and the compliance of the IGR reactor facility (IGR RF) state, its systems and equipment with the design requirements, executive and operational documentation was established. The neutronic calculations of the fission products’ activity and activation products, as well as the exposure dose rate of ionizing radiation at different distances from the main construction elements of the IGR RF, were performed using the MCNP5 software package. Based on the calculation results, a group of radionuclides was established, which makes the main contribution to the radioactive emission of the IGR reactor core, and the main construction elements that significantly affect the radiation environment of the IGR RF were determined. Based on the instrumental and computational studies results, the Terms of Reference for the development of the technical project “The IGR Reactor Facility Decommissioning” were developed and approved with the Committee of Atomic and Energy Supervision and Control of the Ministry of Energy of the Republic of Kazakhstan.
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