Solonin

pp. 409-419

pp. 420-437

pp. 398-412

pp. 227-239

The article presents data on the development of the laboratory complex for determining a deformation capacity (mechanical properties) of the fuel rod claddings under pellet-cladding interaction (PCI) and controlled conditions specified by the following parameters: temperature, strain rate, hydrogen concentration, the concentration of corrosive medium (iodine). The article discusses the testing results of the mechanical loading device layout and the mechanical loading device (MLD) as such when stress is applied to Ø9.1x7.73 mm zirconium cladding from alloy E110 o.ch. at the temperatures of 380°C and 350°C via the plunger force acting on the simulator of fuel pellet made of aluminum oxide.

Experimental research of two-phase adiabatic flow in sparging regime in cylindrical vertical channels with different levels of air volume rates was carried out. Vector velocity fields obtained using the optics methods were analyzed to identify a character of the air volumes motion, a bubbles shape, velocities of both phases, a character of the liquid phase motion in the lower part of channel, void fractions. Obtained data describe a structure of two-phase flows in-detail for various flow regimes and can be used as a verification base for math models in modern CFD-codes.

The model of convective and diffusion transfer in rod bundle with mixing grids was developed. Result of calculations were compared with experimental data. Heat transfer in simulation of fuel bundle of WWER-1000 were modeled