Severe Accident Mitigation through Improvements in Filtered Containment Vent Systems and Containment Cooling Strategies for Water Cooled Reactors : Proceedings of a Technical Meeting on Severe Accident Mitigation through Improvements in Filtered Containment Venting for Water Cooled Reactors Held in Vienna, Austria, 31 August-3 September 2015. - IAEA (IAEA TECDOC Series No. 1812., 2017)