1. NAME AND TITLE
TIBSO: Code System to Calculate Production and Migration of Radionuclides in Nuclear
KFKI Atomic Energy Research Institute, Budapest, Hungary.
3. CODING LANGUAGE AND COMPUTER
Fortran -77; PC DOS, VAX/VMS, RISC/6000 (C00512/MNYCP/00).
4. NATURE OF PROBLEM SOLVED
TIBSO follows the nuclear transition and the spatial migration of radioactive models. The
modeling of such processes is established in a very flexible way enabling the user to investigate a
wide range of problems. Nuclear data libraries from CCC-371/ORIGEN2 are included. Libraries
for structural, fission product, and actinide materials are provided as part of the package. Coupling
with thermohydraulic codes like RELAP and CONTAIN, it can be used for calculation of radioactive
release in the case of nuclear accidents. Its output can be used to environmental codes like CRAC2.
5. METHOD OF SOLUTION
The spatial migration is modeled by transition between nodes. The system of first order linear
differential equations describing the nuclear decay and activation process and the transitions between
nodes is solved by step-wise numerical integration.
6. RESTRICTIONS OR LIMITATIONS
Due to dynamic programming techniques only the available storage can restrict the number of
isotopes and nodes.
7. TYPICAL RUNNING TIME
Running times are highly dependent on the complexity of the system being modeled. Depending
on the complexity (number of nodes, number of isotopes, length of the process), from some minutes
up to two hours on a 486/33MHz PC.
8. COMPUTER HARDWARE REQUIREMENTS
TIBSO has run on PC-386, Vax, and IBM RS/6000 workstations.
9. COMPUTER SOFTWARE REQUIREMENTS
TIBSO runs under AIX, VMS, or DOS. A Fortran 77 compiler is required. It was tested at RSIC
on a Northgate 486/66 running MS-DOS v6.2 using MS Fortran v5.0.
a. Included in documentation:
P. Vertes, Informal Report, "Code for Calculation of Spreading of Radioactive Materials in Complicated Systems (TIBSO code)," (1994).
P. Vertes, Informal Report, "Some Problems of Activity Migration Solved with TIBSO," (1994).
b. Background information:
P. Vertes, "Code for Calculation of Spreading of Radioactivity in Reactor Containment Systems,
(TIBSO code)," KFKI-1992-27/G (September 1992).
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents and 1 (1.44 MB) DOS diskette in self-extracting compressed
DOS files which contains the source code, data libraries, sample problem input, plus output from the
12. DATE OF ABSTRACT
July 1987, revised January 1991, March 1995.
KEYWORDS: ENVIRONMENTAL DOSE; FISSION PRODUCT INVENTORY; NUCLIDE TRANSPORT; MICROCOMPUTER; WORKSTATION