Abstract. We present description of an electrostatic turbulent model ESEL and explain the interchange mechanism leading to turbulence generation in tokamak scrape-off layer. After introducing theory of Bellan instability, we discuss threshold for particle detrapping from turbulent structures (blobs) due to their finite Larmor orbits in case of turbulence simulated by the ESEL model. Since plasma potential as well as floating potential are available from the simulation, it is possible to evaluate error made by using experimentally obtained floating potential in simulations of particle diffusion. We also show that due to bipolar nature of blobs the outflow of particles from the blob caused by Bellan instability can be, in certain conditions, asymmetric and localized mainly into its upper and inner boundary.