Qualification of nuclear reactor nominal power upgrades.
DOI:
https://doi.org/10.15276/opu.2.70.2024.11Keywords:
qualification, increased nominal power, nuclear reactorAbstract
In extreme wartime conditions due to damage/destruction/occupation of a number of power generating facilities and continuous damage/destruction of the critical energy infrastructure of Ukraine, the priority and urgent task of the operating organization of nuclear power plants (State Enterprise "National Nuclear Energy Generating Company “Energoatom”) is to increase the efficiency of safe operation of operating nuclear power units based on qualification and implementation of strategies for increased nominal power and duration of the fuel campaign of nuclear reactors. An analysis of known approaches to substantiating (qualifying) strategies for operating nuclear reactors of the VVER/PWR type at increased nominal power is presented. It is recognized that the main shortcomings of known approaches to qualifying nuclear reactor core modernizations lie in the dependence of the qualification results on the methods of implementing the strategy for operating nuclear power plants in increased nominal power modes, as well as on the effects of the difference in deterministic codes and/or code users, that ultimately complicates the objective interpretation of the qualification results. A criterion-based method for qualifying the strategy for operating nuclear reactors at increased nominal power based on the modernization of the thermophysical properties of nuclear fuel and the structural and technical parameters of fuel elements has been developed, which eliminates the influence of the effects of the difference in deterministic codes and/or code users and takes into account the conditions for ensuring safety regarding the maximum permissible temperatures of fuel and nuclear fuel claddings.
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