1. NAME AND TITLE

ETHEL: Code System for Generating Cross Sections for PSR-128/THERMOS.

2. CONTRIBUTOR

Ente Nazionale per l'Energia Elettrica - Centro Di Ricerca Termica e Nucleare (ENEL-CRTN) in Milano, Italy, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

ETHEL generates the cross section library for THERMOS. The scattering model can be chosen among different Nelkin-type models, the Wigner-Wilkin model, and the Brown-St. John model.

5. METHOD OF SOLUTION

The work started from EGERIA with the aim of including the Koppel-Young's model in order to study thermalization problems in hydrogeneous media. The inclusion was realized by using the code SCAM and rewriting it in Fortran. Much work was done to eliminate errors. This improved version of EGERIA was named ETHEL. ETHEL can also consider the calculus of the matrices relating to the isotropic scattering with a correction of transport type and generate a new library tape or update an old one.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The test case included in the package ran in 40 seconds of CPU time on the IBM 3081K.

8. COMPUTER HARDWARE REQUIREMENTS

On an IBM 3081K, 192 K bytes of main storage were required.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

E. Brega, O. Chiovato, and F. Di Pasquantonio, "How to Use the ETHEL Code: A Program to Produce THERMOS Library," ENEL N5/81/05 (1981).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and test case input.

12. DATE OF ABSTRACT

May 1986.