Russian satellites equipped by nuclear power systems (NPS) ceased to be active and turned into category of space debris from 12 to 30 years ago. However, until now these systems constitute radiological hazard in the case of their re-entry to dense layers of the Earth atmosphere. Besides, beryllium and its oxides, lithium hydride and uranium as NPS materials constitute chemical hazard. These circumstances demand analysis of the consequences in the case of NPS re-entry. Brief results of such analysis are given in the present paper.