Development of quantification method for design parameters of PDRC system in KALIMER-600

The conceptual design of a sodium cooled liquid metal reactor, KALIMER (Korea Advanced LIquid MEtal Reactor) of which electric output is 150 MWe, has performed by KAERI (Korea Atomic Energy Research Institute). A revised design concept up-rating electric capacity to 600 MWe, named as KALIMER-600, has been currently developed. The residual heat removal (RHR) system under a loss of normal heat sink accident of KALIMER-600 is characterized by the concept of PDRC (Passive Decay heat Removal Circuit) and it has superiority in the aspect that an enough decay heat removal capacity can be provided since it uses a very simple concept of direct reactor pool cooling. This study describes quantification method for the steady-state design parameters of PDRC system at the design point. On the basis of the inter-relationship between the various design parameters quantified by using the method, overall characteristics of PDRC system corresponding to the variations of system design parameters have been investigated, and more detail calculations are also performed using the quantified results such as the variations of the temperature, pressure loss, mass flow rate and UA values in each heat transfer circuit and heat exchangers in PDRC system