Scaling Analysis of Reactor Cavity Cooling System for PMR 200

A government-sponsored research on the essential technologies pertinent to the development of the demonstration plant PMR 200, a VHTR demonstration plant, is being performed at the KAERI. The verification of the RCCS (Reactor Cavity Cooling System) performance is one of the key issues among the objectives included in the 3-year national nuclear research program, starting year 2012. It is customary, due partly to the limitation of financial resources and physical space, to perform a test in a reduced-scale test facility. In a process of scaling down, a distortion of physical phenomena is unavoidable since the matching of all pertinent non-dimensional parameters is practically impossible. Therefore, a scaling analysis is imperative in order to check the degree of distortion and applicability of the test results to the prototype design. A scale-down test are currently being performed in the ANL (1/2 scale), the University of Wisconsin (1/4 scale), and the Texas AM University (1/12 scale). This paper describes the requirement of the design PMR 200 and the result of scaling analysis of the RCCS in order to provide a basis for the design of the test facility to be built in the KAERI