The safety and safety work on OKG, Oskarshamns Kraftgrupp, is supervised by SKI, Swedish nuclear power inspectorate. The task of SKI is to inspect that the nuclear power plants of Sweden runs in a safe way. The proprietor of the permit who runs nuclear power plants has the responsibility to maintain the required safety to run a plant. SKI publishes a number of statue books that OKG has to meet to be able to run the plants. SKI recommends in SKIFS 2 004:1, that OKG work with the safety requirements of IAEA. IAEA, International Atomic Energy Agency is a worldwide cooperation in the nuclear industry. The purpose with the thesis is to do a gap-analysis between the management system of OKG and GS-R-3, a safety standard of IAEA, furthermore basis to work with possible gaps will be brought up. The expected result is to find possibilities for improvements in the management system of the organization. The methods used in the thesis are literature studies, interviews and classification. An assessment has been made, if the management system of OKG meets the safety standard GSR- 3 of IAEA. The assessment is based on information in documents from the management system of the company and information that had been brought up by interviews with experts in different areas. The interviews have been a complement when the documents not were clear enough. For some of the possibilities to improve that was found, basis to work with these areas was brought up from IAEA and WANO. WANO, the World Association of Nuclear Operators, is an organization with the purpose to increase safety end reliability in the nuclear industry, by increasing communication, exchanging information and comparison between the nuclear power plants around the world. The requirements were divided in to three classes, those requirements that were met by the management system, those who were partly met and those that were not at all met. Finally 64 % was assessed being met, 29 % partly met and 7 % not met at all by the management system of OKG. The conclusion drawn is that there are a number of possibilities to improve the management system of OKG to be able to meet the IAEA GS-R-3. The major areas to work with is grading of documents, working with processes, assessing the organization, handling nonconformances, working with improvements and feedback from experience. / <p>Uppsatsnivå: D</p>