Izvestiya vuzov. Yadernaya Energetika

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

A study into the starting modes of the VVER-1000 RCP in an earlier inoperative loop

9/30/2019 2019 - #03 Nuclear power plants

Bragin I.E. Belozerov V.I.

DOI: https://doi.org/10.26583/npe.2019.3.03

UDC: 621.039.5

To simulate the starting mode of an RCP in an earlier inoperative loop, KORSAR/GP, a code supporting coupled numerical simulation of neutronic and thermal-hydraulic transients in a VVER reactor plant in operating and emergency conditions, was chosen as the computational tool.

Studying these modes using thermal-hydraulic codes makes it possible to analyze the course of transients and certain emergency processes without using commercial test procedures, which contributes to laying the groundwork for addressing the issues involved in ensuring the reliability, operating safety and efficiency of nuclear power plants.

Increased requirements to the safety of NPPs identify the need for getting rid of excessive conservatism in the analysis based on which requirements to safety systems are formulated, as well as for enhancing the knowledge of the regularities of thermal-hydraulic transients based on advanced computer programs (or codes) designed for improved computational analysis of non-stationary thermal hydraulics in the water-cooled reactor circulation circuits in emergency and transient modes relying on inhomogeneous non-equilibrium mathematical models of two-phase flows and on a detailed description of the physical transient regularities.

The purpose of the study is to analyze computationally the starting of a VVER-1000 RCP in an earlier inoperative loop at different reactor plant power values. To do this, one requires to develop the VVER-1000 reactor primary circuit computational pattern to simulate the transient taking place as one RCP is started, to conduct a further analysis, and to compare the key monitored reactor coolant and core parameters (power, temperature, flow rate, etc.).

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mode reactor coolant pump (RCP) circulation loop reactor plant scram reactivity coefficient safety margin reactor plant power