PRELIMINARY MODELING OF THE PROCESS OF REGULATING GROUP INSERTION IN COURSE OF THE START-UP TEST OF TAINWAN-4
29th Symposium of AER on VVER Reactor Physics and Reactor Safety (2019, Energoland, Mochovce NPP, Slovakia)
reactor physics experiments and code validation
1 NRC “Kurchatov Institute”
2 CNNC Jiangsu Nuclear Power Cooperation
During the commissioning of Unit 4 of Tianwan NPP at the power level of about 50% the process of insertion of regulating group 10 in course of boron dilution was performed to measure the group efficiency. Experimental data of the process, including temperatures, flow rates, pressures, control rods positions, in-core and ex-core detectors readings, etc. were carefully recorded by monitoring, control and diagnostic systems. It was then found these data are suitable for modeling by means of coupled three dimensional neutronics and thrmo-hydrolics code.
The paper presents results of preliminary modeling of that process by means of BIPR-ATHLET-VVER code. The problem of transforming of this problem to the benchmark is discussed.