RSICC Home Page RSICC CODE PACKAGE CCC-652

RSICC CODE PACKAGE CCC-652

RSICC no longer distributes MACCS or SECPOP. If you are interested in obtaining MACCS or SECPOP, please address your request to SPBCODES.Resource@NRC.GOV at the US Nuclear Regulatory Commission (NRC).

 

1. NAME AND TITLE

MACCS2 Ver. 1.13.1: MELCOR Accident Consequence Code System for the Calculation of the Health and Economic Consequences of Accidental Atmospheric Radiological Releases.

 

MACCS users who run SECPOP2000 should be aware of problems in theSECPOP2000 code. The message which was recently posted to registered MACCS users, is appended to the SECPOP abstract

http://www-rsicc.ornl.gov/codes/psr/psr5/psr-527.html.

 

AUXILIARY CODES

DOSFAC2: NRC dose conversion factor (DCF) preprocessor.

FGRDCF: DCF preprocessor based on the DCF databases of Federal Guidance Reports 11 and 12 from ORNL (DLC-172).

COMIDA2: Food pathway preprocessor based on the COMIDA (PSR-343) food pathway preprocessor developed at the Idaho National Engineering Laboratory.

 

DATA LIBRARIES

METSUR.INP: Meteorological Data for Surry

SURSIT.INP: Site Data File for Surry

 

2. CONTRIBUTORS

Sandia National Laboratories, Albuquerque, New Mexico,

Oak Ridge National Laboratory, Oak Ridge, Tennessee,

Idaho National Engineering Laboratory, Idaho Falls, Idaho.

 

3. CODING LANGUAGE AND COMPUTER

Fortran 77; Pentium processor (C00652/PC486/01).

 

4. NATURE OF PROBLEM SOLVED

MACCS2 Version 1.13.1 simulates the impact of accidental atmospheric releases of radiological materials on the surrounding environment. The principal phenomena considered in MACCS are atmospheric transport, mitigative actions based on dose projection, dose accumulation by a number of pathways including food and water ingestion, early and latent health effects, and economic costs. MACCS can be used for a variety of applications including probabilistic risk assessment (PRA) of nuclear power plants and other nuclear facilities, sensitivity studies to gain a better understanding of the parameters important to PRA, and cost benefit analysis. This release includes corrections and enhancements from the previous Version 1.12. A brief description of changes is listed in the readme.txt file. Some information is posted on this DOE webpage: http://www.eh.doe.gov/sqa/central_%20registry/MACCS2/maccs2.htm

 

June, 2005 addition

An online forum for users of MACCS2 (RSICC Code Package CCC-652) is operational at http://www.maccs2support.chaninconsulting.com. This is a weblog (or blog) where support is provided regarding the code's input, models, and output. Many details of the code's internal algorithms are not documented and are difficult to decipher, even with examination of the source code. This forum will create a searchable archive of questions and answers for the benefit of current and future code users.

 

 

5. METHOD OF SOLUTION

MACCS2 contains simple models with convenient analytical solutions. A MACCS2 calculation consists of three phases: input processing and validation, phenomenological modeling and output processing. The phenomenological models are based mostly on empirical data, and the solutions they entail are usually analytical in nature and computationally straightforward. The modeling phase is subdivided into three modules. ATMOS treats atmospheric transport and dispersion of material and its deposition from the air utilizing a Gaussian plume model with Pasquill-Gifford dispersion parameters. EARLY models consequences of the accident to the surrounding area during an emergency action period. CHRONC considers the long term impact in the period subsequent to the emergency action period.


Detailed meteorological, population, and economic and health data are required depending upon the type of analyses to be performed and output required. Model parameters can be provided by the user via input facilitating the analysis of consequence uncertainties due to uncertainties in the model parameters.

 

6. RESTRICTIONS OR LIMITATIONS

The atmospheric model included in the code does not model the impact of terrain effects on atmospheric dispersion. The code also does not model dispersion close to the source (less than 100 meters from the source) or long range dispersion. The economic model included in the code models only the economic cost of mitigative actions.

 

7. TYPICAL RUNNING TIME

The MACCS2 test cases ran in 9 minutes on a Pentium 4 1.4 Ghz PC under Windows2000.

 

8. COMPUTER HARDWARE REQUIREMENTS

Pentium PC with 256 MB of RAM. Approximately 80 MB of hard disk space is required to load the complete MACCS2 package.

 

9. COMPUTER SOFTWARE REQUIREMENTS

Included executables were compiled on a Pentium 4 using Compaq Visual Fortran Professional 6.6B on Windows XP Professional. The executables run on Windows XP, 2000 and Windows NT platforms. Fortran source files are included. Testing on non‑PC systems has not been done for MACCS2 Version 1.13.

 

10. REFERENCES

a) documentation in C652.PDF:

K. L. McFadden, readme.txt (February 2004).

D. Chanin and M. L. Young, Code Manual for MACCS2, Users Guide, NUREG/CR-6613, Vol. 1, SAND97-0594 (May 1998).

D. Chanin and M. L. Young, Code Manual for MACCS2, Preprocessor Codes COMIDA2, FGRDCF, IDCF2, NUREG/CR-6613, Vol. 2, SAND97-0594 (May 1998).

M. L. Young and D. Chanin, DOSFAC2 Users Guide, NUREG/CR-6547, SAND97-2776 (December 1997).

H-N. Jow, J. L. Sprung, J. A. Rollstin, L. T. Ritchie, D. I. Chanin, MELCOR Accident Consequence Code System (MACCS), Model Description, NUREG/CR-4691, SAND86-1562, Vol. 2 (February 1990).

 

 

b) references included in Documentation directory are reports listed above plus:

K.F. Eckerman, A.B. Wolbarst, and A.C.B. Richardson, "Limiting Values of Radionuclide Intake and Air Concentration and Dose Conversion Factors for Inhalation, Submersion, and Ingestion," Federal Guidance Report No. 11, EPA‑520/1‑88‑020 (September 1988).

K.F. Eckerman and J.C. Ryman, "External Exposure to Radionuclides in Air, Water, and Soil," Federal Guidance Report No. 12, EPA 402‑R‑93‑081 (September 1993).

 

 

 

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and the Fortran source codes, executables, data, and sample problems which are distributed on 1 CD in a WinZIP file.


 

12. DATE OF ABSTRACT

May 1997, revised June 1998, March 2004, June 2005.

 

KEYWORDS: REACTOR ACCIDENT; AIRBORNE; ENVIRONMENTAL DOSE; INTERNAL DOSE; NUCLIDE TRANSPORT; MICROCOMPUTER; GAUSSIAN PLUME MODEL