United States Nuclear Regulatory Commission - Protecting People and the Environment

RASCAL 3.0: Description of Models and Methods (NUREG-1741)

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Publication Information

Manuscript Completed: February 2001
Date Published: March 2001

Prepared by:
A. L. Sjoreena
J. V. Ramsdell, Jr.b
T. J. McKennac
S. A. McGuired
C. Fosmiree
G. F. Atheyf

aOak Ridge National Laboratory
P.O. Box 2008
Oak Ridge, TN 37831
dlncident Response Operations
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
bPacific Northwest National Laboratories
P.O. Box 999
Richland, W A 99352
elnnovative Emergency Management
8555 United Plaza Boulevard
Baton Rouge, LA 70809
cInternational Atomic Energy Agency
Wagramerstrasse 5
P.O. Box 100
A-1400, Vienna, Austria
fAthey Consulting
P.O. Box 178
Charlestown, WV 25414

S. A. McGuire, NRC Project Manager

Prepared for:
Incident Response Operations
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The Radiologic Assessment System for Consequence AnaLysis (RASCAL) 3.0 is the latest version of the RASCAL series of codes. RASCAL was developed for use by U.S. Nuclear Regulatory Commission personnel who conduct an independent assessment of radiological accidents to prepare dose projections. It includes three sets of tools for use in consequence analysis STDose, FMDose, and DecayCalc. STDose estimates (1) source terms for radiological accidents, (2) atmospheric transport, diffusion, and deposition of effluents from the accidents, and (3) doses from exposure to the effluents. FMDose calculates doses from environmental measurements of activity in the air and on the ground. DecayCalc calculates activity of radionuclides present at a future time following decay and ingrowth. The current version of RASCAL includes computational techniques that are substantially modified from those used in the prior versions of RASCAL and significantly expands the capabilities of STDose. The major changes to STDose are (1) the inclusion of time-dependent source terms and source terms for fuel cycle and materials accidents, (2) the inclusion of radiological decay during atmospheric transport, (3) the addition of a UF6 atmospheric transport model, and (4) the ability to include meteorological data from multiple stations and the effects of terrain. The major changes to FMDose are the addition of emergency-worker guidance and derived intervention-level calculations.

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