In accordance with Principles Relevant to the Use of Nuclear Power Sources in Outer Space (resolution 47/68 of 14 December 1992), Member States inform the Secretary-General regarding safety assessments carried out prior to launch of nuclear-powered space objects. This information is distributed to Member States as a UN document in all official languages.
The following notifications have been received by the United Nations since 1996.
| Year | Notifying State | Space Object | Type of NPS | Document |
| 2005 | United States of America | New Horizons | Radioisotope thermoelectric generator | A/AC.105/864 |
| 1997 | United States of America | Cassini/Huygens | Radioisotope thermoelectric generator |
A/AC.105/677
A/AC.105/677/Add.1 |
| 1996 | Russian Federation | Mars 96 | Radioisotope thermoelectric generator | A/AC.105/647 |