关键词: 反应流出物, 蒸汽发生器, 泄漏, 管孔开槽, 胀度控制, 光亮退火, 镍基合金

Abstract: Under the conditions of high temperature, high pressure and bundle vibration, crevices between tube and tube sheet are easily to appear in reaction effluent steam generator. From the view of residual contact pressure of hydraulic expansion, the pipe joint should adopt strength welding and strength expansion, the slotting position should be close to the shell side, the slotting width should be appropriately increased to about 7 mm, the expansion degree should be controlled at 4%~6%, and the NS1402 heat exchange pipe should be supplied in 960 ℃ protective atmosphere high temperature annealing state. In order to prevent alkali stress corrosion, the corrosion resistance of NS1402 in alkali stress corrosion environment is compared with that of common nickel and nickel based alloys, and their suitability to tubeside medium is discussed as well. It is concluded that NS3306, NS3105 or NS3102 can replace NS1402 as an alternative material for reaction effluent steam generator tube bundle upgrading. But the vibration of equipment, manufacturing requirements, service life and cost budget should be considered comprehensively.

Key words: reaction effluent, steam generator, leakage, slotting of pipe hole, expansion controlling, bright annealing, nickel based alloys