Nuclear Suppliers Group is a recognised international organisation, which has laid the foundations for an efficient monitoring of the transport and use of these materials, in order to prevent their misuse. Transport control system is made possible through a voluntary application of NSG Guidelines, which prescribe regulations and monitoring measures for nuclear materials and technology supplier countries. NSG member countries decide in which countries the materials and technology of the so called double-purpose would be exported. The Republic of Croatia is the 45th country which has met the requirements for becoming a NSG member country, meaning that its national legislation is in harmony with the high standards expected from the member countries, and that its institutions take care of applying these standards.