This event can be classified one of three levels, depending on its estimated level of impact > code Green: accidental, natural or intentional real or potential event able to cause a low impact and remediable with a specific predefined solution (operational instructions); > code Yellow: accidental, natural or intentional real or potential event able to cause a medium impact and remediable with activation of the related predefined emergency plans; > code Red: accidental, natural or intentional real or potential event able to cause a significant impact that requires the definition of ad hoc strategies.