摘要
当发生堆芯熔化事故时,压力容器外部冷却是保持压力容器完整性及实现熔融物堆内滞留(In-Vessel Retention,简称IVR)的一项重要策略。在高温熔融物的热载荷和内部压力的共同作用下,压力容器外壁面和保温层之间的冷却流道可能发生变形,造成冷却能力的降低,进而威胁到压力容器的完整性。因此,有必要分析IVR条件下压力容器冷却流道变形的影响因素。结果表明,热膨胀是造成冷却流道变形的主要因素。在IVR策略成功的前提下,内压和热流密度对流道变形的影响有限。
The external reactor vessel cooling is an important strategy for maintaining the integrity of the pressure vessel and for holding the melt in the case of core melt. The cooling channel betw een the pressure vessel outer w all and insulation layer may be deformed under the combined action of the thermal load and the internal pressure. It maybe leads to cooling capacity reducing and then threatens the integrity of the pressure vessel. Therefore,it is necessary to analyze the influencing factors of the cooling channel deformation of the pressure vessel under IVR. The results show that the thermal dilatation is the main factor causing the deformation of the cooling channel. Under the premise of successful implementationof IVR strategy,the influence of internal pressure and heat flux on cooling channel deformation is limited.
出处
《核安全》
2017年第2期5-10,共6页
Nuclear Safety
基金
国家科技重大专项课题
项目编号:2015ZX06002007-003
关键词
熔融物堆内滞留
外部冷却流道
热膨胀
堆芯熔毁
In-Vessel Retention
external coolant channel
thermal dilatation
core melt
