Abstract
Abstract The Korea Atomic Energy Research Institute (KAERI) and some foreign laboratories have carried out six examinations of pulled tubes from Korean nuclear power plants, since the first commercial operation of Kori Unit 1 in 1978. A total of 15 tubes were extracted that exhibited different types of failures such as pitting, outer diameter stress corrosion cracking (ODSCC), primary water stress corrosion cracking (PWSCC), intergranular attack (IGA), etc. The pitting of the Plant A tube was related to high copper dissolved from the condenser material, and the presence of Cl− and high dissolved oxygen. Transgranular SCC observed at Plant B seemed to be related to lead compounds. ODSCC and IGA in Plant A were deduced to be connected to the formation of an aggressive environment in the crevices. PWSCC in Plant A and Plant C originated from the inherent characteristics of the materials, which were not properly thermally treated. After the failure analysis, the performance of nondestructive testing was evalu...
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