传热管破裂位置及根数对SGTR事故进程的影响

以一体化反应堆为研究对象,应用RELAP5/MOD3.4程序对套管式直流蒸汽发生器发生传热管破裂事故时,影响事故进程的一些因素进行了分析,其中包括破口在传热管轴向高度不同断裂位置,以及同时断裂多根传热管等。分析结果表明:不同断裂位置处的SGTR事故,其系统响应大致相同;不同破裂面积的SGTR事故,其破口处临界喷放流量与破口面积有着密切的联系。但总体来看,无论直流蒸汽发生器发生何种形式的SGTR,其一回路冷却剂通过破口处向二回路侧泄漏的积分流量大致相同,而且这个积分流量决定了一体化反应堆的瞬态响应。

Effects of rupture location and the number of ruptured tubes on the analysis of SGTR accident

A steam generator tube rupture event in the integral type reactor has been investigated using the best estimate thermal hydraulic system code,RELAP5/MOD3.4.The effects of the parameters such as the number of ruptured tubes,rupture location on the analysis of the SGTR event in integral type reactor are examined.Results of these cases are provided for scoping purpose to show the mild influence of the break size on the total loss of mass.This confirms that the integral type reactor response to a steam generator tube rupture is not significantly impacted by the rupture location and the postulated number of ruptured tubes,and the total loss of mass from the primary system is always small compared to the RCS water inventory.It is found that the most dominant parameter governing the reactor reaponse is the leak flow rate.