Izvestiya vuzov. Yadernaya Energetika

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

Analysis of mass transfer processes in a reactor during a loss-of-coolant accident

3/23/2018 2018 - #01 Global safety, reliability and diagnostics of nuclear power installations

Lepekhin A.N. Polunichev V.I.

DOI: https://doi.org/10.26583/npe.2018.1.12

UDC: 621.039.586

The purpose of the work was to optimize the parameters of the spillage system equipped with a gas pressure hydroaccumulator for a ship water-to-water reactor in a loss-of-coolant accident. The water-gas ratio in the hydroaccumulator and the hydraulic resistance of the path between the hydroaccumulator and the reactor were optimized at the designed hydroaccumulator geometric volume.

The main dynamic processes were described using a mathematical model and a computational analysis. A series of numerical calculations were realized to simulate the behavior dynamics of the coolant level in the reactor during the accident. Estimates of the minimum and maximum values of the coolant level were obtained: depending on the initial water-gas ratio in the hydroaccumulator at different diameters of the flow restrictor on the path between the hydroaccumulator and the reactor. These results were restricted by the conditions that, during spillage, the coolant level should remain above the core and below the blowdown nozzle. The first condition implies that the core is in a safe state, the second excludes the coolant water blowdown. The optimization goal was to achieve the maximum time interval in which these conditions would be satisfied simultaneously.

The authors propose methods for selecting the optimal parameters of the spillage system; these methods provide the maximum time for the core to be in a safe state during a loss-of-coolant accident at the designed hydroaccumulator volume. Using these methods, it is also possible to make assessments from the early stages of designing reactor plants.


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accident coolant leak coolant level the core safe state optimization spillage system reactor hydroaccumulator design analysis