ESTS0608 RSAC-6.

1. NAME OR DESIGNATION OF PROGRAM:  RSAC-6

3. DESCRIPTION OF PROGRAM OR FUNCTION

RSAC-6 is the latest version of the program RSAC (Radiological Safety Analysis Computer Program). It calculates the consequences of a release of radionuclides to the atmosphere. Using a personal computer, a user can generate a fission product inventory; decay and in-grow the inventory during transport through processes, facilities, and the environment; model the downwind dispersion of the activity; and calculate doses to downwind individuals. Internal dose from the inhalation and ingestion pathways is calculated. External dose from ground surface and plume gamma pathways is calculated. New and exciting updates to the program include the ability to evaluate a release to an enclosed room, resuspension of deposited activity and evaluation of a release up to 1 meter from the release point. Enhanced tools are included for dry deposition, building wake, occupancy factors, respirable fraction, AMAD adjustment, updated and enhanced radionuclide inventory and inclusion of the dose-conversion factors from FOR 11 and 12.

4. METHODS

RSAC6 calculates meteorological dispersion in the atmosphere using Gaussian plume diffusion for Pasquill-Gifford, Hilmeier-Gifford and Markee models. A unique capability is the ability to model Class F fumigation conditions, the meteorological condition that causes the highest ground level concentrations from an elevated release. Doses may be calculated for various pathways including inhalation, ingestion, ground surface, air immersion, water immersion pathways. Dose calculations may be made for either acute or chronic releases. Internal doses (inhalation and ingestion) are calculated using the ICRP-30 model with dose conversion factors from FOR 11. External factors are calculated using FOR 12.

6. TYPICAL RUNNING TIME

Running time is case dependent. (e.g. PC-Windows98 Intel Pentium 1.2 GHz)
  
Test            Description                                   Runnig time
(sec.)
EXAMPLE1.OUT    Simulated Reactor Operation                   1.10E-01
EXAMPLE2.OUT    Calculation of Inhalation Dose                2.20E-01
EXAMPLE3.OUT    Ing.Dose Calculation from an Acute Release    1.10E-01
EXAMPLE4.OUT    Ground Surface Dose Calculation               2.20E-01
EXAMPLE5.OUT    Air Inmmersion Dose Calculation               1.10E-01
EXAMPLE6.OUT    Fisty-Mile Rad. Dose Calc. for Chronic Rel.   1.10E-01
EXAMPLE7.OUT    Comparison of Cloud Gamma Dose Models         1.10E-01
EXAMPLE8.OUT    Hypothetical Criticality Accident             1.26E+00
EXAMPLE9.OUT    Dose Calc. Changing Meteo. Conditions         5.50E-01

7. UNUSUAL FEATURES

RSAC6 calculates complete progeny in-growth and decay during all accident phases. The calculation of fission product inventories in particularly useful in the analysis of accidents where the short-lived radionuclides change rapidly as a function of decay time or accidents with criticality excursions. RSAC6 also has provisions for calculating release from an operating reactor. RSAC6 fission product calculations are valid primarily for high enriched fuels. Provision is also made of users to import fission product, actinide and activation product inventories calculated using other codes such as ORIGEN2 when desired.

10. REFERENCES

- R.L. Coates and N.R. Horton:
  RSAC - A Radiological Safety Analysis Computer Program
  IDO-17151 (May 1966).
- L.C. Richardson:
  Users Manual for FORTRAN Version of RSAC, A Radiological Safety
  Analysis Computer Program
  IDO-17261 (June 1968).

- D. R. Wenzel and B. J. Schrader:
The Radiological Safety Analysis Computer Program (RSAC-6) - Users' Manual
(INEEL/EXT-01-00540, 2001)

11. HARDWARE REQUIREMENTS:  IBM PC.

13. SOFTWARE REQUIREMENTS:  Windows 98.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

No source code is provided.
For Windows NT/XP/ME an abnormal program termination was found ("stack fault").

15. NAME AND ESTABLISHMENT OF AUTHORS

Douglas R. Wenzel and Brad J. Schrader
Idaho National Engineering and Environmental Laboratory
Idaho Falls, Idaho 83415
USA

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