The International Nuclear Power and Propulsion System (INPPS) flagship for Mars and Europa flights will be introduced from space system and sub-system point of views. It will be described the INPPS flagship orbiting satellite, which will fulfill UN regulations for nuclear power sources (NPS) in space. Insofar the orbiting small satellite will be equipped with MEDIPIX / TIMEPIX detectors to measure in real time particle radiation. Moreover the orbiting satellite delivers real time video from INPPS flagship during interplanetary cruise and may be equipped with scientific payload as well.