1. NAME AND TITLE

IRDAM: Interactive Rapid Dose Assessment Model.

2. CONTRIBUTOR

Battelle Pacific Northwest Laboratory, Richland, Washington.

3. CODING LANGUAGE AND COMPUTER

BASIC; IBM PC/XT/AT.

4. NATURE OF PROBLEM SOLVED

IRDAM is a micro-computer based program for rapidly assessing the radiological impact of an accident at a nuclear power plant. The code packaged October 1988 is Version 3.

5. METHOD OF SOLUTION

IRDAM can handle a variety of accidental release scenarios. Information on meteorological conditions, source term mixtures, and time periods for decay and plume passage are all incorporated in the calculations. The activity or quantity of the release can be identified in several ways. Both elevated and ground-level releases can be accommodated. Dose equivalents are calculated for the whole body (5-cm depth) and thyroid (infant) at six fixed downwind distances between 500 and 20,000 meters.

The IRDAM system is highly interactive and assumes that an operator has expertise in radiation protection, but has little or no computer experience. By answering questions posed by IRDAM, an operator is guided through the input requirements of the calculations. The model has site- specific information and pre-programmed defaults that will enable the operator to make radiological dose estimates with a minimum of information.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The scenarios execute in seconds.

8. COMPUTER HARDWARE REQUIREMENTS

The code was originally written for an Osborne computer using GW-Basic. However, the code runs on a variety of personal computers, including H-P and IBM PC/XT/AT computers.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was tested with the IBM BASICA interpreter by RSIC.

10. REFERENCES

G. F. Martin Transmittal Letter, Battelle Pacific Northwest Laboratories, Richland, Washington (August 3, 1987).

R. W. Poeton, M. P. Moeller, G. J. Laughlin, A. E. Desrosiers, Interactive Rapid Dose Assessment Model (IRDAM), NUREG/CR-3012, PNL 4510, Vols.1-3 (May 1983).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one double-sided, double-density diskette.

12. DATE OF ABSTRACT

October 1988.