[en] A computer mode is described which is based on the statistical simulation of particle motion in a random velocity field, for use in predicting particulate deposition in complex reactor coolant geometries. The model uses a finite element procedure based on the BERGEN mesh generation program for discretising a bounded continuum and a particle equation of motion based on quasi-steady drag. Two applications of the model are described:-(1) Statistical motion of particles in the entrance region of a central inertial collector (CIC), and (2) Statistical motion in an in-line array of boiler tubes. (author)