Nonlinear Probabilistic Analysis of the Safety of Rein- forced Concrete Emergency Tank under Extreme Temperature J. Králik a and P. Rosko b a Faculty of Civil Engineering, STU Bratislava, Slovakia b Center of Mechanics and Structural Dynamics, Vienna University of Technology 1 Introduction The International Atomic Energy Agency set up a program to give guidance to its member states on many aspects of the safety of nuclear power reactors. The resistance of the building structure to extreme steam pressure in the case of small or medium-sized accidents must be checked. During the nineties, the requirements for service safety of the NPP Type V1 in- creased. In 1994, the Slovak Nuclear Inspection Authority defined the conditions for the gen- eral reconstruction of the NPP V1 hermetic zone [12]. Figure 1: Containment and emergency tank 800 m3 of NPP V1 Abstract: This paper describes the nonlinear analysis of the reinforced concrete emergency tank in nuclear power plant (NPP) with reactor VVER V-230 consider- ing an accidental temperature. The scenario of the hard accident in NPP is in ac- cordance with the requirements of IAEA in Vienna and U.S.NRC in Washington. IASSAR Safety, Reliability, Risk, Resilience and Sustainability of Structures and Infrastructure 12th Int. Conf. on Structural Safety and Reliability, Vienna, Austria, 6–10 August 2017 Christian Bucher, Bruce R. Ellingwood, Dan M. Frangopol (Editors) c 2017 TU-Verlag Vienna, ISBN 978-3-903024-28-1 2151