In the shipbuilding sector, nuclear reactors are one component that important in nuclear powered ships. A ship that has an identity as a nuclear powered ship has been applied in various developed countries to be used as war interests and as an icebreaker. Its like radioisotope, until now it has experienced growth and regeneration in the fourth, where generation IV is called the most innovative reactor. The best known technology is PWR. However, this PWR will be simplified in the concept of being small compartment. The concept will be a compartment structure analysis concept at the writing of this thesis. Therefore, this analysis is carried out to find out how to analyse the compartment structure in its application on nuclear powered vessels...