[en] 1 - Description of program or function: GENII-S is the result of implementing GENII in the SUNS software shell. SUNS was developed to simplify the application of Monte Carlo methods of uncertainty analysis to a variety of problems. The GENII portion of the GENII-S package contains the program which was developed to incorporate the internal dosimetry models recommended by the International Commission on Radiological Protection (ICRP) into the environmental pathway analysis models used at Hanford. GENII, which is available as CCC-0601, is a coupled system of seven programs and the associated data libraries that comprise the Hanford Dosimetry System (Generation II) to estimate potential radiation doses to individuals or populations from both routine and accidental releases of radionuclides to air or water and residual contamination from spills or decontamination operations. The GENII system includes interactive menu-driven programs which allow the user to effectively address the parameters required for scenario generation and data input, internal and external dose factor generators, and environmental dosimetry programs. There also exist pull-down help menus which provide the user with a description of the input parameter and the possible options. The programs in GENII-S analyse environmental contamination resulting from both far-field and near-field scenarios. GENII-S can calculate annual dose, committed dose, and accumulated dose from acute and chronic releases from ground or elevated sources to air or water and from initial contamination of soil or surfaces and can evaluate exposure pathways including direct exposure via water, soil, air, inhalation pathways, and ingestion pathways. In addition, GENII-S can perform 10,000-years migration analyses and can be used for retrospective calculations of potential radiation doses resulting from routine emissions and for prospective dose calculations. HEDL contributed additional data to the CCC-0601/GENII package in March 1995. These data are intended to improve the treatment of decay chains for calculations of doses form contaminated soil allowed to decay for hundreds of years. The Sensitivity and Uncertainty analysis Shell (SUNS) provided the capability to perform sensitivity and uncertainty analysis in one calculation, eliminating manual interfaces between the GENII code results and the sensitivity and uncertainty analysis codes. The main features of SUNS include: 1) an interactive full-screen input of all model data, 2) a customized help system, 3) the ability to modify setup options while inside SUNS, 4) a formatted printing of data files, 5) a full internal file management, 6) a consistent interface for data entry, editing, and processing/viewing output, 7) the ability to create both deterministic output blocks (results from parametric analysis, for example) and result from repeated trials in a single run, 8) an ASCII test output file (for data echo, debugging, and non-tabular output) in addition to SUNS output files, 9) a generation of statistical output information, including minimum and maximum value, means, variances, and percentiles in addition to simple and partial correlation coefficients for both raw and rank data, 10) the creation of graphical output including histograms, cumulative and complementary cumulative distribution functions, scatter plots, and x-y plots, 11) the tools (with a consistent user interface) to aid in model installation, and 12) user-specified menu options available to run any DOS program or batch file. 4. 2 - Method of solution: SUNS interactively prepares a text input file for input to the environmental dosimetry programs and the necessary processing files to manage the file handling needed to control the operations of the five subsequent codes and prepare an output report. ENVIN controls the reading and organization of the input files for ENV, which then calculates the environmental transfer, uptake, and human exposure to radionuclides that result from the chosen scenario for the defined source term. ENV writes the annual media concentrat ions and intake rates to an intermediate data transfer file for use by DOSE. DOSE converts data to radiation dose, calculating the external dose using factors generated by EXTDF and the internal dose using factors generated in INTDF. DOSE calculates the one-year dose, committed dose, cumulative dose, and maximum annual dose and prepares the normal output report of doses and optional doses by pathway and by radionuclide. EXTDF calculates the external dose-rate factors for submersion in an infinite cloud of radioactive materials, immersion in contaminated water, and direct exposure to plane or slab sources of contamination. EXTDF used the ISOSHLD point kernel integration technique whereby numerical integration is carried out over the source volume to obtain the total dose. INTDF estimates the dose equivalents in a number of target organs from the activity in a given source organ based on ICRP-30 models and biokinetic values for radionuclide residency and transport in the body. The dose equivalent in a target organ problem is solved using a coupled set of differential equations. DITTY calculates long-term total population exposure based on air and water source terms, atmospheric dispersion patterns, and exposed population. A straight-line cross-wind-averaged Gaussian plume model is used for the dispersion calculation, and the regional population is defined as a function of time for airborne and waterborne pathways. The time frame may be any 10,000-year period, broken into 143 periods of 70 years each. 3 - Restrictions on the complexity of the problem: Maximum of 100 radionuclides, 16 sectors, 10 distance intervals, and 5 shields