The international law governing Nuclear power sources (NPS) in Space

Recent changes of Space activities due to Globalization with emerging phenomenon of space Nuclear power sources (NPS) for deep space missions reached its peak from 4th of January 2004. The National Aeronautics and space Administration (NASA) due to Project Prometheus have started a research on the application of nuclear fission reactors. Since solar energy and other kind of energies are not suitable for January to deep space. Using Nuclear power sources (NPS in USA started from 40 years ago which was mostly in the form of Radio isotope thermoelectric generators (RTGs) and Radio isotope Heater units (RHGs).
The aim of this article is deliberation of the treaties and rules of international law especially international space law which are enforceable for space nuclear power sources. In this article by applying analytic -descriptive method of research, we are about to answer this question that what are the duties and responsibilities of states who are carrying out or Licensing this kind of space activities and Committee on the peaceful uses of outer space (COPUOS) for prevention of their Potential risks?