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The RADTRAN computer code for transportation risk analysis, which has been under continuous development at Sandia National Laboratorios since 1977, has evolved fiom a purely research tool into a publicly available system with a variety of applications. This expansion of the user community has substantially increased the need to make the system easier to use without decreasing its capabilities or the quality of output, A large set of modifiable W T R A N input files has been available via "'RANSNET for several years. Orre approach to assisting the user invofves adding annotations/ information to each of these files. A second approach is providing additional help in building new/modifjring old hput files.Keeping the proposed informatiodannotation files separate from but closely coupled to the modifiable input files within the TRANSNET shell system allows the modifiable input files to remain as regular input files while providing rapid, automatic access to useful information about the analysis. Tn this way, the sample input files m a i n intact as regular RADIXAN input files and any files generated using associated on-line menus or editors may be readily converted into new input files. A single samplc fiIe is selected and used as an example to illustrate the prototype help features.

This Technical Manual contains descriptions of the calculation models and mathematical and numerical methods used in the RADTRAN 6 computer code for transportation risk and consequence assessment. The RADTRAN 6 code combines user-supplied input data with values from an internal library of physical and radiological data to calculate the expected radiological consequences and risks associated with the transportation of radioactive material. Radiological consequences and risks are estimated with numerical models of exposure pathways, receptor populations, package behavior in accidents, and accident severity and probability.

This report describes ship accident event trees, ship collision and ship fire frequencies, representative ships and shipping practices, a model of ship penetration depths during ship collisions, a ship fire spread model, cask-to-environment release fractions during ship collisions and fires, and illustrative consequence calculations.

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