压力容器-保温层流道变形条件下临界热流密度试验研究

针对压力容器外部冷却(ERVC)应用中的压力容器-保温层流道(RPV-保温层流道)变形问题,利用提高临界热通量影响因素(FIMR)的试验装置,在相同流量范围开展了变形条件下壁面临界热流密度(CHF)的试验研究,分析了流道变形和流量变化对压力容器(RPV)下封头壁面CHF的影响规律,获得了流道变形情况下ERVC的安全裕度。结果表明:随着RPV下封头角度升高,循环流量增加,下封头壁面CHF增大;与原型流道相比,变形流道下封头壁面CHF的变化幅度小于7%,流道变化的影响并不显著;变形流道中,下封头壁面安全裕量最小的位置与原型流道相同,其安全裕量略有提高。     

压力容器-保温层流道变形条件下临界热流密度试验研究

Aiming at the deformation issue of flow gap between reactor pressure vessel (RPV) and insulation in external reactor vessel cooling (ERVC), the effects of insulation deformation on the critical heat flux (CHF) of the bottom head were investigated with FIMR test facility within the same flow rate range. The influence laws of different factors including angle of bottom head wall, flow rate and insulation deformation on CHF of RPV wall were analyzed. The safety margin of ERVC under deformation condition was finally obtained. The results show that the CHF of the bottom head will increase as the angle of the bottom head wall increases or the flow rate increases. Compared to the CHF of the bottom head in the prototype channel, the varying amplitude of CHF under deformation condition is less than 7%. In a word, the effect of insulation deformation on CHF is not significant. What is more, the location, where the safety margin is smallest, at the bottom head wall in the deformed gap is the same with that in the normal gap, while the smallest safety margin in the deformed gap is slightly improved.