Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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A Study of fracture Mechanics Analysis Methodology for Stress Corrosion Cracks in Pressure Component Weld feints

  • Park, June-soo (NSSS Engineering & Development Division, Korea Power Engineering Co., Inc.) ;
  • Kim, Jong-Min (NSSS Engineering & Development Division, Korea Power Engineering Co., Inc.) ;
  • Pak, Jai-hak (Dept. of Safety Engineering, Collge of Engineering, Chungbuk National University) ;
  • Jin, Tae-eun (Power Engineering Research Institute, Korea Power Engineering Co., Inc.)
  • Published : 2003.05.01
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Abstract

A fracture mechanics analysis methodology for stress corrosion cracks (SCCs) existing in the Alloy 600 nozzle weld joint for control rod drive mechanisms (CRDMs) of pressurized water reactor is studied. Effects of weld residual stresses on the sub-critical crack behavior during the reactor operation are investigated by a fracture mechanics analysis, which is combined with the finite element alternating method. It is found that effects f the residual stresses on the stress intensity factor (SIF) and crack growth rate (CGR) are dominant and values of SIF and CGR of cracks in the region of weld joint are increased by a factor of three or more on an average.

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