Abstract
Flaws resulting from corrosion are still a significant issue in nuclear power plants. Prevention of these flaws is one of the biggest themes of plant maintenance and new countermeasures have been developed year by year. In this paper three newly proposed techniques are presented: (1) ceramics coatings on flange seal surface by surface hardening due to laser-alloying to prevent pitting corrosion; (2) Induction Heating Stress Improvement (IHSI) on nozzle safe-end with thermal sleeve by using forced cooling; and (3) TIG Torch Heating Stress Improvement (THSI) to reduce welding residual stress on small diameter pipes.
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