10MW高温堆热启动时蒸汽发生器管板焊缝处疲劳分析

Fatigue Analysis of Welded Joint at Tube-plate of Steam Generator in HTR-10

10MW高温气冷堆事故停堆后短时间内热启动能使反应堆快速提升功率,从而节省大量的启动时间。但是热启动时,蒸汽发生器联箱仍保持较高温度,大约在430℃左右,而二回路给水温度只有100℃。如此大的温差必将在蒸汽发生器的传热管与管板的焊接处产生很大的热应力,容易引起疲劳损伤。通过合理保守的简化,分析10MW蒸汽发生器管板和传热管的温差,从而进行应力计算和疲劳评价。

When 10 MW high temperature gas cooling reactor restarts in short time after hot shutdown, the reactor power can rise quickly and save much time. However, the temperature of steam generator keeps high (about 430°C) after hot shutdown, and the temperature of the secondary loop is about 100°C. The large temperature differences will generate high thermal stress and thus lead fatigue damage at the weld joint of the tube and tube-plate of steam generator. This paper will analyze the temperature differences, calculate the stress level and evaluate the fatigue damage of weld joint of steam generator in HTR-10.