Abstract
Tube-Tube sheet welding area of Steam Generator is one of the most fallibility positions in the first loop of Nuclear Power Plant. To make sure the Secondary side hydro-test of on site of Steam Generator is successful at the first round, the relative parties organize to check the 8948 Tube-Tube sheet sealing welding area before the test. Through the introduction of the Checking progress, for example, Defect confirming, Defect location, Defect dealing, Defect repair and other progress, the basic reason of deviation has been analyzed. And also, some discussions and concerns were given which will very useful as an experience feedback.
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