This paper presents the reactor vessel downcomer scaling analysis and scaling criteria for the scaled test facility, based on the Hierarchical Two -Tiered Scaling (H2TS) Methodology. Four different methods for the determination of the downcomer dimensions were investigated and discussed for simulating the important thermal - hydraulic phenomena in the downcomer. In the engineering design of the integral test facilities, multiple considerations of these methods should be carefully evaluated.%本文采用H2TS比例分析方法对比例试验中压力容器下降环腔的宽度进行了比例分析,得到了相似设计准则,分析表明为了能够准确的模拟下降段重要的物理现象需要考虑四个与宽度设计相关的相似准则,在设计不同比例的整体性试验台架时,需要综合考虑各现象的相似比例设计要求.
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