Calculation tools used for the computational support of operating fast reactors

The timeliness of this paper is defined by the global issues specific to the current nuclear power, including handling of spent nuclear fuel (SNF) and radioactive waste (RW), and efficiency of using the energy potential of natural uranium resources. The transition to the so-called «two component» nuclear power system (NES) that combines reactors with thermal and fast neutron spectra operating in a single closed nuclear fuel cycle, makes it possible to resolve the above issues in the safest and most cost effective way, and paves the way for extensive nonelectric use of nuclear energy in production of «useful» isotopes for medical and industrial applications. The decision to start this transition was made by the management of Rosatom State Corporation with regard for the experience of successfully operating the Beloyarsk NPP's unit 3 with a BN600 reactor (for over 40 years) and unit 4 with a BN800 reactor (for 6 years). Computational support activities have been undertaken throughout the BN600 reactor operation period. Prior to each cycle between refueling, neutronic calculations are performed by three organizations: Beloyarsk NPP (Operator), IPPE JSC (Research Adviser), and Afrikantov OKBM JSC (Chief Designer). Coupled neutronic calculations makes it possible to ensure the safety and reliability of the reactor operation in each particular core loading. The commissioning of the BN800 reactor and the feasibility of a closed fuel cycle have extended the computational support application scope. The paper describes the computational support techniques for IPPE JSC as the research adviser organization, and for the prospects for the development of computational support.