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RSICC CODE PACKAGE CCC-711



1. NAME AND TITLE

EASY-99: Multipurpose Activation and Transmutation Code System.



Data Library

EAF-99: European Activation File - 1999.



2. CONTRIBUTOR

UKAEA/EURATOM Fusion Association, Oxfordshire, United Kingdom, through the OECD NEA Data Bank, Issy-les-Moulineaux, France.



3. CODING LANGUAGE AND COMPUTER

Fortran 77 & C - IBM RS/6000, SUN, HP, Intel PC (C00711MNYCP01).



4. NATURE OF PROBLEM SOLVED

The European Activation System (EASY) is a complete tool for the calculation of activation in materials exposed to neutrons. It can be used for any application (fusion, transmutation, fission and accelerator) where the neutron energy does not exceed 20 MeV. EASY-99 consists of the inventory code FISPACT-99 and the EAF-99 file, which contains various libraries of nuclear data. EASY-99 calculates the response of materials irradiated in a neutron flux. It is designed to investigate fusion devices which will act as intense sources of high energy (14 MeV) neutrons and cause significant activation of the surrounding materials. EASY-99 has a number of special features including an uncertainty file, pathways analysis, sequential charge particle contributions, pulses or continuous irradiation and gas production (as daughter and emitted particle). The package also contains EAF-97 and FENDL-2 data. EASY-99 is an updated version of CCC-678/EASY-97. Information on EASY-99 is posted at the UKAEA web site: http://www.fusion.org.uk/.

5. METHOD OF SOLUTION

The basic equations solved by the FISPACT code are those giving the rate of change of nuclide number density with time: the Bateman equation. The method of solution used is basically that of Sidell, that is a numerical solution. The number densities are calculated by the Taylor series expansion in a modified form.

The European Activation File (EAF) is the collection of nuclear data that is required to carry out inventory calculations of materials that have been activated following exposure to neutrons. EAF-99 contains cross section data of neutron-induced reactions for energies between 10 to the power of -5 eV and MeV. The library contains data for targets up to and including fermium (Z-100).

The EAF-99 library contains 12468 excitations functions involving 766 targets from 1H to 257Fm, in the incident energy range up to 20 MeV. The SYMPAL code has been used to update most of the data. A set of nine different multigroup libraries are provided, available group structures are: WIMS (69), GAM-II (100), XMAS (172), VITAMIN-J (175) and TRIPOLI(315). Various choices of micro flux weightings are available for particular application. Other data libraries are included: fission yield, ingestion and inhalation indices, A2 values for the transport of radioactive material. Particle emission spectra, stopping power and cross sections libraries for alpha, deuteron, helium, proton and triton allow secondary charge particle activation contributions to be calculated.



6. RESTRICTIONS OR LIMITATIONS

Having a numerical solver there is no restriction except for the limitations imposed by the nuclear data which are made available to the solver. The convergence of the solution is checked regularly and tested against internal and user defined limits.



7. TYPICAL RUNNING TIME

Running times are rather platform dependent but typically span from tenth to hundreds of seconds.



8. COMPUTER HARDWARE REQUIREMENTS

EASY-99 runs on IBM RS/6000, SP2, SUN, HP, and Intel PC.



9. COMPUTER SOFTWARE REQUIREMENTS

Fortran and C compilers are required to build executables on Unix and Linux computers. The source code was compiled and executed at RSICC on an IBM RS/6000 Model 590 running AIX version 4.2.1 with XL Fortran 5.1.1.0 and C version 4.3. Makefiles are provided for Sun, IBM, HP and Intel PC linux systems.

In February 2003, the Windows version was added to the RSICC package. The Windows release was developed for Windows 95, 98 and NT4.0 in 1999. The included PC executable created by the author with the Salford FTN77 compiler was tested at RSICC on Pentium computers running WindowsNT, Windows2000 and WindowsXP. Fortran source files are not included in the Windows distribution.



10. REFERENCES

R. A. Forrest and J-Ch. Sublet, "FISPACT-99: User Manual," UKAEA FUS 407 (December 1998).

J-Ch. Sublet, J. Kopecky, and R. A. Forrest, "EAF-99: Cross Section Library, "UKAEA FUS 408 (December 1998).

R. A. Forrest and J-Ch. Sublet, "EAF-99: Decay Data Library," UKAEA FUS 409 (December 1998).

R. A. Forrest and J-Ch. Sublet, "EAF-99: Biological, Clearance and Transport Libraries," UKAEA FUS 410 (December 1998).

R.A. Forrest, "EASY-99: Overview," EDS-0 (December 1998).

J-Ch. Sublet, J. Kopecky, R. A. Forrest, & D. Nierop, "EAF-99: REPORT File," EDS-3a.

R. A. Forrest, "FISPACT-99: Validation," EDS-2a (December 1998).



11. CONTENTS OF CODE PACKAGE

Included is a CD-ROM with a GNU compressed Unix tar file which contains scripts, source files, test cases, data libraries and documentation files for Unix users. The CD also contains an executable, data libraries, test cases, a Windows executable, and install procedures for Windows users.



12. DATE OF ABSTRACT

July 2002, revised February 2003.



KEYWORDS: ACTIVATION; FUSION; ISOTOPE INVENTORY; WORKSTATION