The Effect of Analysis Variables on the Failure Probability of the Reactor Pressure Vessel by Pressurized Thermal Shock

가압열충격에 의한 원자로 압력용기의 파손확률에 미치는 해석변수의 영향

  • 장창희 (한국원자력안전기술원 금속재료실) ;
  • 정명조 (한국원자력안전기술원 원자력안전연구실) ;
  • 강석철 (한국원자력안전기술원 금속재료) ;
  • 최영환 (한국원자력안전기술원 원자력안전연구)
  • Published : 2004.06.01


The probabilistic fracture mechanics(PFM) is a useful analytical tool to assess the integrity of reactor pressure vessel(RPV) at the event of pressurized thermal shock(PTS). In PFM, the probabilities of flaw initiation and propagation are estimated by comparing the applied stress intensity factor with the fracture toughness calculated by the simulation of various stochastic variables. It is known that the results of PFM analyses are dependent on the choice of the stochastic parameters and assumptions. Of the various variables and assumptions, we investigated the effects of the RT$_{NDT}$ shift equations, fracture toughness curves, and flaw distributions on the PFM results for the three PTS transients. The results showed that the combined effects of the RT$_{NDT}$ shift equations and fracture toughness curves are complicated and dependent on the characteristics of the transients, the chemistry of the materials, the fast neutron fluence, and so on.


Pressurized Thermal Shock;Reactor Pressure Vessel;Probabilistic Analysis;RT$_{NDT}$ ;Flaw Distribution;Fracture Toughness


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  1. Round robin analysis for probabilistic structural integrity of reactor pressure vessel under pressurized thermal shock vol.19, pp.2, 2005,