Izvestiya vuzov. Yadernaya Energetika

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

Real-Time Temperature Field Recovery of a Heterogeneous Reactor Based on the Results of Calculations in a Homogeneous Core

3/20/2021 2022 - #01 Thermal physics and thermal hydraulics

Kuzevanov V.S. Podgorny S.K.

DOI: https://doi.org/10.26583/npe.2022.1.05

UDC: 621.039.51

Advanced pressurized water reactors are the main part of a new generation of nuclear power plant projects under development that provide cost-effective power production for various needs [1 – 6]. The innovative technologies are aimed at improving the safety and reliability as well as at reducing the cost of NPPs. At the same time, improvements in design, technological and layout solutions are focused primarily on the reactor core.

Assessments of the efficiency of these improvements are preceded by numerical simulations of the processes in the core, in particular heat generation and sink, with account for the difference between the study object and the standard version tested in operational practice.

The authors of the article propose a method for calculating the temperature field in the core of a heterogeneous reactor (using the example of a pressurized water reactor), which makes it possible to quickly assess the level of temperature safety of various changes in the core and has the necessary speed for analyzing transients in real time.

This method is based on the energy equation for an equivalent homogeneous core in the form of a heat equation that takes into account the main features of the simulated heterogeneous structure.

The procedure for recovering the temperature field of a heterogeneous reactor uses the analytical relation obtained in this work for the heat sink function, taking into account inter-fuel element heat leakage losses. Calculations of temperature fields in the model of the PWR type reactor [7] were carried out in stationary and transient operating modes. The calculation results were compared with the results of CFD simulation. Mutual coincidence of the temperature fields in fuel elements in the transient process was obtained. The area of competing use of the temperature field recovery method was indicated.

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temperature field reactor core thermal conductivity equation heat sink function fuel element real time