Fuel rod failure was investigated during a simulated reactivity initiated accident (RIA) in-reactor experiments which have been performed in the Nuclear Safety Research Reactor. Pre-pressurized on inner surface in clad and eccentricity fuel pellet can cause large stresses on fuel rod cladding, therefore these are significant factor of fuel rod failure under RIA.
Higher order shell theory and exact solution are used to calculate stresses caused by pre-pressurized and eccentricity fuel pellet. These stresses are compared with yielding stress and failure strength of clad in order to determine failure of fuel rod cladding.
Stress of fuel rod cladding of KORI 1 during a simulated RIA with system pressure and inner pressure on clad are calculated by presented method. The effect of pressure and eccentricity fuel pellet are discussed. Subsequent yield and failure of fuel rod cladding of KORI 1 are examined on this paper.
