Vessels must have sufficient displacement and stability in order to sail safely. Vessels need to provide necessary stability criterias during entire voyage. First international stability regulations have been applied to vessels in 1968. The criterias proposed within these regulations are recommended to the vessels over 100 meters by IMO (International Maritime Organization). The criterias in the proposal have not considered any dynamic effects. Hence, IMO constituted weather criterias in 1985. IMO first constituted the previously applied stability criterias in 1993, and afterwards collected the current stability regulations under the IS CODE headline in 2008. In spite of all applied stability criterias, vessels those capesized lead IMO to consider new regulations. These potential regulations are mostly about dynamic effects that vessels are exposed to. Since 2005, subcommity of IMO, SLF (Stability, Loading Lines and Safety of Fishing Vessels) has started to study over Second Generation Intact Stability Criteria.

In this paper, prestudies over Second Generation Intact Stability Criteria about Level 1 Vulnerability Criteria for parametric roll that is presented at SLF delegation of IMO in 2010 and 2011 examined with examples. The thesis emphasizes what the criteria require and how existing vessels will be effected.

Keywords: Intact stability, IMO stability, parametric roll, vulnerability criteria