Assessment technique for structural intergrity of heavy water power station

An assessment technique for structural integrity of a heavy water power station is provided to reduce the time by monitoring a breakdown of a zirconium pressure pipe in real time using probabilistic fracture mechanics. An assessment technique for structural integrity of a heavy water power station includes the steps of: determining a first fracture value by calculating, on the base of a first deterministic fracture mechanics, data generated by a probability distribution function to identify the structural integrity of a pressure pipe(S11); progressing the first fracture value determining step again by counting the number of cracks if there are cracks in the pressure pipe or progressing the first fracture value determining step again if thickness of the crack is satisfied with a predetermined comparing condition after increasing a first simulation count, one direction thickness and axis direction length of the crack if there are no cracks(S12); determining a second fracture value by calculating, on the base of a second deterministic fracture mechanics about data generated by a probability distribution function if the thickness of the crack is not satisfied with the comparing condition(S13); progressing the first fracture toughness value determining step again by counting the number of cracks if there are cracks in the pressure pipe or progressing the second fracture toughness value determining step again after increasing a second simulation count and axis direction length of the crack if there are no cracks(S14); and calculating a damage probability of the pressure pipe using the crack count and the simulation target count if the first and the second simulation counts are larger than a simulation target count(S15).