1. NAME AND TITLE

NSLINK: NJOY SCALE LINK.

AUXILIARY CODES:

NJOY87: NJOY cross section processing code, version 1987.

XLACSR: a stripped-down version of the XLACS-2 code.

MILER: converts NJOY GENDF output to AMPX-2 format.

UNITABR: merges output from MILER and XLACSR.

BONAMI: certain subroutines from the BONAMI code included to account for Bondarenko and Nordheim resonance treatment.

2. CONTRIBUTORS

Delft University of Technology, Delft, The Netherlands.

NEA Data Bank, Gif-sur-Yvette, Cedex, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; VAX family.

4. NATURE OF PROBLEM SOLVED

NSLINK is a set of computer codes to couple the NJOY cross-section generation code to the SCALE-3 code system retaining the Nordheim resolved resonance treatment option.

5. METHOD OF SOLUTION

The following codes comprise the NSLINK system.

XLACSR passes all l=0 resonance parameters as well as the contributions from all other resonances to the group cross sections. The output file has AMPX-2 format. The NJOY code is used to calculate all other data.

MILER converts NJOY output in GENDF format to AMPX-2 format. Note that MILER in this package has been updated and obsoletes RSIC's PSR-271/MILER package.

UNITABR merges the output of XLACSR and MILER in such a way that contributions from the bodies of the l=0 resonances in the resolved energy range, calculated by XLACSR, are subtracted from the 1-D group cross-section arrays for fission (MT=18) and neutron capture (MT=102).

BONAMI subroutines are included in the package to account for the combination of Bondarenko and Nordheim resonance treatment.

6. RESTRICTIONS OR LIMITATIONS

The system is compatible with AMPX-2 master format and SCALE-3 and, therefore, cannot be used with SCALE-4. Because the GENDF format changed in the NJOY91 release, this package cannot be used with NJOY91 but is compatible with either NJOY87 or NJOY89. NJOY87 is included in this package.

7. TYPICAL RUNNING TIME

The sample problem with 187 neutron groups and P3 calculation was run on a DEC VAXstation 3100 (model 30); XLACSR took 8 minutes; MILER took about 80 seconds and UNITABR took 8 seconds.

The following times were noted on the VAX 8810 at NEA Data Bank:

Sample problem 1 1hr;20m;39s for NJOY87.

Sample problem 2 1hr;0 m;25s for NJOY87.

Sample problem 1 41s for MILER.

Sample problem 2 41s for MILER.

Sample problem 4s for UNITABR.

8. COMPUTER HARDWARE REQUIREMENTS

The code will run on the VAX family of computers.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran 77 and uses VAX Fortran compiler under the VMS operating system.

10. REFERENCE

P. F. A. de Leege, NSLINK: NJOY-SCALE-LINK, User's Manual, IRI-131-091-003 (May 1991).

N. M. Greene, "Alert to All Scale Users," (letter), July 13, 1992.

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and three DS/HD (1.2 MB) 5.25-in. diskettes which include the source files, sample input and output.

12. DATE OF ABSTRACT

October 1991.