比例试验台架中的储热分析

在模拟原型电站事故瞬态的整体性能试验台架中，金属结构的储热问题直接影响台架的模拟范围和试验结果。基于传热基本理论建立了3种储热分析方法，进而对缩比试验台架中的储热问题进行深入分析，并应用集总参数法和积分功率法对我国正在建造的ACME台架压力容器储热释放的瞬态过程和积分平均总能量进行分析和评价。结果表明：3种储热分析方法的相似要求是逐渐减少的；缩比试验台架设计中，在满足整体自然循环现象相似的前提下，储热释放过程不能保证严格的相似；ACME台架压力容器壁面的储热，在快速降压瞬态过程中的早期阶段很快被释放出来，不会对系统的长期行为产生较大影响，且储热积分平均总能量的比例失真在可接受范围内。

Stored Energy Analysis in Scale-down Test Facility Stored Energy Analysis in Scale-down Test Facility

In the integral test facilities that simulate the accident transient process of the prototype nuclear power plant, the stored energy in the metal components has a direct influence on the simulation range and the test results of the facilities. Based on the heat transfer theory, three methods analyzing the stored energy were developed, and a thorough study on the stored energy problem in the scale-down test facilities was further carried out. The lumped parameter method and power integration method were applied to analyze the transient process of energy releasing and to evaluate the average total energy stored in the reactor pressure vessel of the ACME (advanced core-cooling mechanism experiment) facility, which is now being built in China. The results show that the similarity requirements for such three methods to analyze the stored energy in the test facilities are reduced gradually. Under the condition of satisfying the integral similarity of natural circulation, the stored energy releasing process in the scale-down test facilities can’t maintain exact similarity. The stored energy in the reactor pressure vessel wall of ACME, which is released quickly during the early stage of rapid depressurization of system, will not make a major impact on the long-term behavior of system. And the scaling distortion of integral average total energy of the stored heat is acceptable.