TMAP2000 Use Page: 3 of 26
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ABSTRACT
The TMAP Code was written in the late 1980s as a tool for safety analysis of systems
involving tritium. Since then it was upgraded to TMAP4 and used in numerous applications
including experiments supporting fusion safety, predictions for advanced systems such as the
International Thermonuclear Experimental Reactor (ITER), and estimates involving tritium
production technologies. Its further upgrade to TMAP2000 was accomplished in response to
several needs. TMAP and TMAP4 had the capacity to deal with only a single trap for diffusing
gaseous species in solid structures. TMAP2000 has been revised to include up to three separate
traps and to keep track separately of each of up to 10 diffusing species in each of the traps. A
difficulty in the original code dealing with heteronuclear molecule formation such as HD and DT
has been removed. Under equilibrium boundary conditions such as Sieverts' law, TMAP2000
generates heteronuclear molecular partial pressures when solubilities and partial pressures of the
homonuclear molecular species and the equilibrium stoichiometry are provided. A further
sophistication is the addition of non-diffusing surface species and surface binding energy
dynamics options. Atoms such as oxygen or nitrogen on metal surfaces are sometimes important
in molecule formation with diffusing hydrogen isotopes but do not themselves diffuse
appreciably in the material. TMAP2000 will accommodate up to 30 such surface species,
allowing the user to specify relationships between those surface concentrations and populations
of gaseous species above the surfaces. Additionally, TMAP2000 allows the user to include a
surface binding energy and an adsorption barrier energy and includes asymmetrical diffusion
between the surface sites and regular diffusion sites in the bulk. All of the previously existing
features for heat transfer, flows between enclosures, and chemical reactions within the enclosures
have been retained, but the allowed problem size and complexity have been significantly
increased to take advantage of the greater memory and speed available on modern computers.
This report provides users of TMAP2000 with the specialized information they will need to
properly construct the input files used with the code. It assumes the user has and is familiar with
the TMAP4 Users Manual, and it focuses on changes from TMAP4 input file requirements.iii
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Longhurst, Glen Reed; Merrill, Brad Johnson & Jones, James Litton. TMAP2000 Use, report, October 1, 2000; [Idaho Falls, Idaho]. (https://digital.library.unt.edu/ark:/67531/metadc887556/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.