PRAMIS: Probabilistic Risk Assessment Model Integration System

Abstract

This document has been designed for users of the Probabilistic Risk Assessment Model Integration System (PRAMIS) computer developed by the authors at Sandia National Laboratories for easy assembly of the individual parts of the NUREG-1150 plant analyses into overall risk results. PRAMIS assembles the following files associated with the NUREG-1150 analyses in matrix format to obtain risk: the Latin hypercube sample, the results of the systems analysis, the results of the accident progression analysis, the results of the source term/partitioning analysis, and the results of the consequence analysis. In addition, various intermediate and conditional quantities are calculated when requested by user-specified input; the fractional contribution to risk of individual plant damage states, accident progression bins and source term groups are determined, and a file containing the original Latin hypercube sample and user-specified dependent variables is generated for use as input to the SAS statistical package. This report provides a tutorial that details how to use the PRAMIS program. The PRAMIS program is written in ANSI standard FORTRAN 77 to make the code as machine-independent as possible.