Interactive Rapid Dose Assessment Model (IRDAM): reactor-accident assessment methods. Vol. 2

Abstract

As part of the continuing emphasis on emergency preparedness, the U.S.Nuclear Regulatory Commission (NRC) sponsored the development of a rapid dose assessment system by Pacific Northwest laboratory (PNL}. This system, the Interactive Rapid Dose Assessment Model (!ROAM) is a micro-computer based program for rapidly assessing the radiological impact of accidents at nuclear power plants.This document describes the technical bases for IRnAM including methods, models and assumptions used in calculations. IRnAM calculates whole IJody (5-cm depth) and infant thyroid doses at six fixed downwind dist~nces between 500 and 20,000 meters. Radionuclides considered primarily consist of nohle gases and radioiodines. In order to provide a rapid assessment capability consistent with the capacity of the Osborne-1 computer, certain simplifying approximations and assumptions are made. These are described, along with default values (assumptions used in the absence of specific input) in the text of t~is document. Appendices provided include a code listing (Appendix I), flowcharts (Appendix II), and results of quality assurance comparisons (Appendix III).Two companion volumes to this one provide additional information on

Dose-projection considerations for emergency conditions at nuclear power plants

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