CCC-0476 CAAC.

1. NAME OR DESIGNATION OF PROGRAM:  CAAC.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The Clean Air Act Codes (CAAC)  implement the radiological assessment methodology used for the preparation of the Environmental Protection Agency 1984 Background Information Documents on Radionuclides. Atmospheric dispersion and deposition are calculated by AIRDOS-EPA. Dose and risk assessment tables are calculated by DARTAB from the binary output file produced by AIRDOS-EPA and a file of dose and risk factors calculated by RADRISK. Preprocessors (PREPAR and PREDA) for AIRDOS-EPS and DARTAB  access data bases of element and nuclide dependent data to simplify  the execution of the principal programs.

4. METHOD OF SOLUTION

AIRDOS-EPA implements a long term average Gaussian Plume model. The associated terrestrial model for deposition is based on NRC Regulatory Guide 1.109. The 70-year dose  factors for DARTAB are calculated by RADRISK and, in general, are consistent with those in ICRP-30. Risks are calculated using a linear Life Table model consistent with BEIR-3. The resultant risk factors are 280.5 cancer deaths per 10**6 person rad (low LET) and 700 cancer deaths per 10**6 person WLM exposure to randon decay products.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Programs are limited to 36 radionuclides and to 20 downwind distances for each of 16 compass directions. Memory Regions for execution on an IBM 3081 system under MVS are as follows:
       PREPAR          1008K
       AIRDOS-EPA       716K
       PREDA            148K
       DARTAB           668k

6. TYPICAL RUNNING TIME

A complete run, including PREPAR, AIRDOS-EPA, PREDA, and DARTAB, for an individual and population assessment requires approximately 1 and 2 minutes of CPU time respectively on an IBM 3081 processor.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

DARTAB: Code system for combining airborne radionuclide  environmental exposure data with dosimetric and                health effects data.
AIRDOS-EPA: Estimation of radiation doses caused by airborne                radionuclides around nuclear facilities.
PREPAR: A User-Friendly Preprocessor to Create AIRDOS-EPA                Input Data Sets.
    RADFMT:    Converts DARTAB data to binary.

10. REFERENCES:

- R.E. Moore et al.:
  AIRDOS-EPA: A Computerized Methodology for Estimating
  Environmental Concentrations and Dose to Man from Airborne
  Releases of Radionuclides.
  ORNL-5532  (June 1979)
- C.L. Begovich et al.:
  DARTAB: A Program to Combine Airborne Radionuclide Environmental
  Exposure Data with Dosimetric and Health Effects Data to Generate
  Tabulations of Predicted Health Impacts.
  ORNL-5692  (August 1981)
- A.L. Sjoreen and C. Miller:
  PREPAR - A User-Friendly Preprocessor to Create AIRDOS-EPA Input
  Data Sets.
  ORNL-5952  (August 1984)
- J.G. Darst:
  User's Manual for CCC-476A/CAAC or CCC-476B/CAAC AIRDOS-EPA
  Codes AIRDOS and PREPAR.
  Westinghouse Materials Company, Informal Report (September 1987)

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS:

source program   mag tapeAIRDOS Preprocessor Source Code            SRCTP
source program   mag tapeTIMER Source Code (Assembler)              SRCTP
source program   mag tapeAIRDOS-EPA Source Code                     SRCTP
source program   mag tapeDARTAB Preprocessor Source Code            SRCTP
source program   mag tapeDARTAB Source Code                         SRCTP
test-case data   mag tapeALLRAD Data                                DATTP
test-case data   mag tapePOPA Data                                  DATTP
test-case data   mag tapeFARMA Data                                 DATTP
test-case data   mag tapeSTARA Data                                 DATTP
test-case data   mag tapePRDIND Data                                DATTP
test-case data   mag tapePRPPOP Data                                DATTP
test-case data   mag tapeJCL FORTV                                  DATTP
test-case data   mag tapeJCL ASMHC                                  DATTP
test-case data   mag tapeJCL TESTIND                                DATTP
test-case data   mag tapeJCL TESTPOP                                DATTP
test-case data   mag tapeJCL for RADFMT                             DATTP
source program   mag tapeRADFMT Source Code                         SRCTP
test-case data   mag tapeDARTAB Data File  (Binary)                 DATTP
test-case output mag tapeTESTIND Printed Output                     OUTTP
test-case output mag tapeTESTPOP Printed Output                     OUTTP
report                   ORNL-5532  (June 1979)                     REPPT
report                   ORNL-5692  (August 1981)                   REPPT
report                   ORNL-5952  (August 1984)                   REPPT
report                   WMC Informal Report (September 1987)       REPPT