NUMERICAL AND EXPERIMENTAL INVESTIGATION OF 3D COOLANT TEMPERATURE DISTRIBUTION IN THE HOT LEGS OF PRIMARY CIRCUIT OF REACTOR PLANT WITH WWER-1000

Saunin Yu., Dobrotvorski A., Semenikhin A., Ryasny S., JSC «ATOMTECHENERGO», Russia

24th Symposium of AER on VVER Reactor Physics and Reactor Safety (2014, Sochi, Russia)
Core surveillance and monitoring

Abstract

NUMERICAL AND EXPERIMENTAL INVESTIGATION OF 3D COOLANT TEMPERATURE DISTRIBUTION IN THE HOT LEGS OF PRIMARY CIRCUIT OF REACTOR PLANT WITH WWER-1000
Saunin Yu., Dobrotvorski A., Semenikhin A., Ryasny S. JSC «ATOMTECHENERGO», Mytishchi, Russia
Kulish G., Abdullaev A.
Scientific-Technical Center “Nuclear fuel cycle”, Kharkov Physical-technical Institute, Kharkov, Ukraine
ABSTRACT
When implementing programs to increase capacity of the existing NPPs with WWER-1000 significantly increased demands on the accuracy of determining the weighted average reactor power depends strongly on the temperature stratification in the main circulation pipes, especially in the hot legs.
The paper presents the full-scale experimental data on the coolant temperature distribution in the hot legs obtained with help of regular I&C systems and first of all in-core monitoring system. These data was obtained at the pilot operation stage of unit-4 Kalinin NPP in a stationary condition at nominal power level. For the same condition the results of calculating simulation are presented under using the CFD code.
For the calculations of the temperature distribution in the main circulation pipes had used the computer code Solid Works Flow Simulation (COSMOSFloWorks). Simulation is carried out under the following conditions:

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