TMAP2000: An improved code for tritium calculations

The Tritium Migration Analysis Program (TMAP) was an aid in performing safe ty analyses of fusion systems using combined heat and mass transport calcul ations. Upgraded to TMAP4, it was verified and validated at the INEEL. The further upgrade of the code to TMAP2000 was accomplished in response to sev eral needs. TMAP and TMAP4 had the capacity to deal with only a single trap for diffusing gaseous species in solid structures. TMAP2000 has been revis ed to include up to three separate traps and to keep track separately of ea ch of up to 10 diffusing species in each of the traps. The original code ex perienced problems in dealing with heteronuclear molecule formation such as HD and DT. That has been corrected. A further sophistication is the additi on of non-diffusing surface species and surface binding energy dynamics opt ions. TMAP2000 will accommodate up to 30 such surface species. Additionally , TMAP2000 allows simulation of surface fluxes dependent on a surface bindi ng energy and an adsorption barrier energy. All of the previously existing features for heat transfer, flows between enclosures, and chemical reaction s within the enclosures have been retained, but the allowed problem size an d complexity have been significantly increased to take advantage of the gre ater memory and speed available on modern computers.