Development of the MSPAR-SITE Code for Estimating Multi-Unit MACCS Site

The Multi-Unit Probabilistic Risk Analysis (MU-PSA) is important to assess the off-site consequence from the radionuclide released to the environment in a level 3 PSA. MELCOR Accident Consequence Code System (MACCS) is a computational code for level 3 PSA and widely used in USA, Korea and other countries. In MACCS, all the calculations are conducted and saved in a polar-coordinated grid centered on a point location. Calculation and generation of these site information requires a lot of manpower when working with hand. The MSPAR (Multi-unit Standardized Plant Analysis Risk) SITE can reduce manpower greatly because it makes computer to process calculation of site data, and this is the number one reason the MSPAR-SITE has been developed. In this study, The MSPAR-SITE was developed as a pre-processor of MACCS. It finds a simple or weighted location point for various locations and makes site information for specified points into a MACCS input file. Also, to verify the MSPAR-SITE, a preliminary evaluation of the multi-unit accident was conducted using MACCS with the MSPAR-SITE output. In this study, the MSPAR-SITE was developed to create site information for level 3 MU-PSA. It can find a simple or user-specified weighted average of various locations, derive domestic site information for user-specified grid elements using Divide and Conquer method, and create MACCS input file. Also, a preliminary evaluation of the two units in the reference site was performed by placing the release location on the electric power-weighted average of their locations.