[en] Creation of cracks in the containment liner during an earthquake may lead to partial failure of the leak-tightness function of the liner during a subsequent accident. Within a context of an integrated accident and seismic containment reliability study a methodology is presented for the probabilistic description of liner cracking, in terms of the number of liner cracks and the total crack length as a function of the causative ground acceleration. Earthquake intensities well beyond design levels are considered and simple behavior models are used to make feasible consideration of a large number of uncertainties. The focus in on statistical uncertainty that stems from the limited amount of available information about material properties, the actual state of the system, etc. The effects of the individual components of uncertainty and of the order in which they are introduced, are analyzed. (Auth.)