1. NAME AND TITLE

LISA4: Code System for Long Term Isolation Safety Assessment.

AUXILIARY ROUTINES

PREP: Statistical Preprocessor.

SPOP: Statistical Postprocessor.

2. CONTRIBUTORS

Joint Research Centre, ISPRA, Italy and Japan Atomic Energy Research Institute, Tokai-mura, Japan through the NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; Amdahl 470; IBM 3033, VAX/VMS, Sun Workstation.

4. NATURE OF PROBLEM SOLVED

LISA4 estimates radiation exposures which may affect future generations, as a consequence of radionuclide releases from nuclear waste repositories.

5. METHOD OF SOLUTION

The LISA4 code analyzes different release scenarios from waste repositories situated in sedimentary formations (argillaceous strata and seabed sediments) and includes the following functions: decay chain evolution of the source term as a function of time, radionuclide release from the repository and migration through porous media by diffusion and advection, radionuclide dispersion into fresh-water or sea-water bodies, pathways to man and dosimetry. The Latin Hypercube Sampling technique is employed.

6. RESTRICTIONS OR LIMITATIONS

Restrictions are subject to the dimensions of variables.

7. TYPICAL RUNNING TIME

The simulation depends upon the parameter TMAX, which is the time cutoff. The sample case took about 1 hour on the VAX 8800.

8. COMPUTER HARDWARE REQUIREMENTS

LISA4 was developed on the Amdahl 470 and runs on the IBM 3033, VAX family and Sun workstations.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran 77 compiler is required.

10. REFERENCES

T. Homma, and A. Saltelli, "LISA Package User Guide Part I: PREP, (Statistical Pre Processor) Preparation of Input Sample for Monte Carlo Simulations," EUR 13922 EN (1991).

P. Prado, A. Saltelli, and T. Homma, "LISA Package User Guide Part II: LISA, (Long Term Isolation Safety Assessment), Program Description and User Guide" EUR 13923 EN (1991).

A. Saltelli, T. Homma, "LISA Package User Guide Part III: SPOP, (Statistical Post Processor) Uncertainty and Sensitivity Analysis for Model Output Program Description and User Guide," EUR 13924 EN (1991).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (360 KB) DOS diskette which contains source decks, sample input and output in compressed mode.

12. DATE OF ABSTRACT

March 1988, updated September 1988; September 1992.