CrMoV heavy reactors fabrication has undergone some weld metal reheat cracking issues during the end 2007 / beginning 2008. This paper addresses this particular problem and explains the methodology used to solve it. Usual techniques, such as chemical factors and required NDE, have shown their limits, underlining the fact that this problem was unpredictable. Special mechanical testing as well as very accurate chemical analyses have allowed the authors to find the root cause. Very small amounts of particular impurities were responsible for the cracking and a criterion is then proposed to ensure that the problem will not come out again.

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