[en] Given are a short description and an instruction to the programme of calculating temperature and velocity fields. Considered is the flux in a cluster of heat-generating bars as in a tube with bulk energy and friction sources. The flux is described with a system of three-dimensional non-linear equations of the parabolic type. The solution is found in each of the nodes of a spatial radially-azimuthal grid. The number of layers along the cluster does not exceed 50. The number of nodes in the cross section is limited in complience with the relation M²N(<=)1450, where M is a number of steps over the azimuth, N - a number of steps over the cluster radius. All thermal physical properties of the coolant depend on the temperature. The constant libraries for helium and air are envisaged, with the possibility of introducing thermal physical constant for other gases as well. The computer type is BEhSM-6. The necessary memory volume - the programme operates with a fictitious extended memory only. The programme language is FORTRAN. The operation system is ''Dubna''. Presented is a list of the incoming and outgoing information and the description of main subprogrammes