Efficiency of steam generators (SG) is one of the major components of safety operation of NPP units. The history of design evolution and operation of SG as in Russia, and abroad, shows that main for SG resource is problem of heat exchanging tubes (HET) integrity. It is replaced more than 150 SG on NPP with PWR to 2005 year. It has happened because of heat exchanging tubes have been damaged. This reason has led to replacement of 6 SG on the NPP with WWER [1].

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