Studies on Key Effect Factors of Natural Circulation Characteristics for Advanced PWR Reactor Cavity Flooding System

Table 1

Key parameters of REVECT facility.

Parameters	Value/definition	Remarks
Test pressure	Atmosphere	Pressure in upper water tank
Water temperature at inlet of test section	∼100°C	The saturation temperature corresponds to the pressure of the upper water tank
Target water level of the upper water tank	7300 mm	The elevation of the bottom of the heating section is selected as the 0 m level, the same as the prototype
Elevation of steam exhaust port	8000 mm	Relative to the bottom of the heating section
Circulation type	Natural circulation	The same as the prototype
Working fluid	Deionized water
Steam/water outlet area of the upflow pipe	∼0.01 m^2	About 1/100 of the prototype RPV insulation steam invent port area
Cooling water inlet area of the test section	∼0.01 m^2	About 1/100 of the prototype RPV insulation cooling water inlet port area
Structure of baffles	3-part multilateral structure	With the same structure and “gap size” distribution as the prototype
Circulation resistance	Scaling as the prototype to ensure the consistence of the comprehensive resistance of facility and the prototype	Based on the geometry and resistance distribution analysis of the prototype flow path