ESTS0109 IRDAM.

1. NAME OR DESIGNATION OF PROGRAM:  IRDAM.

3. DESCRIPTION OF PROGRAM OR FUNCTION

IRDAM is a micro-computer based program for rapidly assessing the radiological impact of an accident at a nuclear power plant.

4. 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 informations.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:  The scenarios execute in seconds.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

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

10. REFERENCES:

- R.W. Poeton et al.:
  Interactive Rapid Dose Assessment Model (IRDAM)
  User's Guide
  NUREG/CR-3012 (PNL-4510) Vol.1 (May 1983)
- R.W. Poeton et al.:
  Interactive Rapid Dose Assessment Model (IRDAM)
  Reactor Accident Assessment Methods
  NUREG/CR-3012 (PNL-4510) Vol.2 (May 1983)
- R.W. Poeton et al.:
  Interactive Rapid Dose Assessment Model (IRDAM)
  Scenarios for Comparing Dose Assessment Models
  NUREG/CR-3012 (PNL-4510) Vol.3 (May 1983)

11. MACHINE REQUIREMENTS

The code was originally written for an Osborne computer using GW-Basic. However, the code will run on any PC which supports a reasonably standard version of the Basic language. The code runs on a variety of personal computers, including H-P and IBM PC/XT/AT computers. With some minor modifications the code will compile with a basic compiler.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS.

NEA-DB installed the program on a Brett Pentium 75 desktop computer with 75 MHz and 16 MB of RAM and ran the test case  under Windows 95 / DOS 7.0. The source programs were compiled with GWBasic.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

    R.W. Poeton, M.P. Moeller, G.J. Laughlin, A.E. Desrosiers
    Pacific Northwest Lab.,
    Richland, (United States)

File name	File description	Records
ESTS0109_01.001	Information file	59
ESTS0109_01.002	BASIC source file - Start	36
ESTS0109_01.003	BASIC source file - Part one	325
ESTS0109_01.004	BASIC source file - Part two	909
ESTS0109_01.005	BASIC source file - Part three	386
ESTS0109_01.006	BASIC source file - Calculations	500
ESTS0109_01.007	DOS file-names	6