NEA-1347 NSLINK.

1. NAME OR DESIGNATION OF PROGRAM:  NSLINK.

3. DESCRIPTION OF PROGRAM OR FUNCTION

NSLINK (NJOY - SCALE - LINK) is a set of computer codes to couple the NJOY cross-section generation  code to the SCALE-3 code system (using AMPX-2 master library format) retaining the Nordheim resolved resonance treatment option.

4. METHOD OF SOLUTION

The following module and codes are included in  NSLINK:

XLACSR: This module is a stripped-down version of the XLACS-2 code. The module passes all l=0 resonance parameters as well as the contribution from all other resonances to the group cross-sections,  the contribution from the wings of the l=0 resonances, the background cross-section and possible interference for multilevel Breit-Wigner resonance parameters. The group cross-sections are stored in the appropriate 1-D cross-section arrays. The output file  has AMPX-2 master format. The original NJOY code is used to calculate all other data. The XLACSR module is included in the NJOY  code.

MILER: This code converts NJOY output (GENDF format) to AMPX-2 master format. The code is an extensively revised version of the original MILER code. In addition, the treatment of thermal scattering matrices at different temperatures is included.

UNITABR: This code is a revised version of the UNITAB code. It 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). The l=0 resonance parameters and the contributions from the bodies of these resonances are added separately (MT=1023, 1022 and 1021). The total cross-section (MT=1), the absorption cross- section (MT=27) and the neutron removal cross-section (MT=101) values are adjusted.

In the case of Bondarenko data, infinite dilution values of the cross-sections (MT=1, 18 and 102) are changed in the same way as the 1-D cross-section.

The output file of UNITABR is in AMPX-2 master format and includes Nordheim parameters or Bondarenko and Nordheim parameters for the resonance treatment in BONAMI and/or NITAWL, which are codes of the  SCALE system.

BONAMI: In order to take into account the combination of Bondarenko and Nordheim resonance treatment, certain subroutines are included in the package which replace some subroutines in the BONAMI code.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME

A sample problem (U235) with 187 neutron groups and Legendre polynomial order 3 (P3), requires on a DEC VAXstation 300 (model 30) for XLACSR 8 minutes; MILER 80 seconds and UNITABR 8 seconds.
NEA 1347/01: NEA-DB ran the sample cases of the program system supplied with this package on a VAX 8810 computer. The following execution times were found for the different components:
    Sample Problem     NJOY      MILER      UNITABR
    --------------     ----      -----      -------
         1           1h20m40s     41s          --
         2           1h00m25s     41s         3s47

7. UNUSUAL FEATURES OF THE PROGRAM

The present version of the code package is designed for the NJOY87 code. It can be used with the NJOY89 code as well, by a minor change of the main routine of NJOY89 (add 5 statements).

8. RELATED AND AUXILIARY PROGRAMS

AMPX-II modules (RADE, DIAL, CHOX,  AIM, etc.) can be used to check, edit, couple convert etc. the output files. Standard AMPX-II and NJOY subroutines and functions are widely used in NSLINK.

10. REFERENCES

- R.E. MacFarlane and D.W. Muir:
  NJOY87 - A Code System for Pointwise and Multigroup and Photon
  Cross Sections from ENDF/B Evaluated Nuclear Data
  PSR-171 (November 1987).
- N.M. Greene et al:
  AMPX - A Modular Code System for Generating Coupled Multigroup
  Neutron-Gamma Libraries from ENDF/B (March 1976)
  Revised to level of AMPX-II, ORNL/TM-3706 (December 1978).
- SCALE-3.1 - A Modular Code System for Performing Standardized
  Computer Analysis for Licensing and Evaluation
  CCC-466 (March 1985; July 1986).
- SCALIAS-3.1 - Selected FORTRAN 77 Modules from SCALE-3.1
  (October 1986).
- N.M. Greene:
  Private Communication (November 1988).
- G.C. Panini:
  MILER - Master Interfaces Library makER
  abstract NEA 1198 (July 1988).

- P.F.A. de Leege:
  NSLINK (NJOY-SCALE-LINK)
  (September 1991).

11. MACHINE REQUIREMENTS

XLACSR requires 1600 Kbytes, MILER 800 Kbytes and UNITABR 400 Kbytes of core memory on a VAX computer. Depending on the input choice the following scratch disc space is necessary: XLACSR 200 Kbytes; MILER 40 Mbytes and UNITABR 600 Kbytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VAX/VMS 5.3.

VAX/VMS V5.3

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

          P.F.A de Leege
          Delft University of Technology
          Interfaculty Reactor Institute
          Reactor Physics Department
          Mekelweg 15
          NL-2629 JB Delft, The Netherlands

File name	File description	Records
NEA1347_01.001	Information file	115
NEA1347_01.002	NJOY87 main source	300
NEA1347_01.003	XLACSR source	8708
NEA1347_01.004	NJOY87 subroutines	50486
NEA1347_01.005	MILER source	4785
NEA1347_01.006	UNITABR source	2757
NEA1347_01.007	BONAMI subroutines	454
NEA1347_01.008	Command file to compile and link	15
NEA1347_01.009	JEF-1 H1 data	521
NEA1347_01.010	JEF-1 H1-H2O thermal scattering law data	24398
NEA1347_01.011	JEF-1 U235 data	5344
NEA1347_01.012	Sample problem 1 input NJOY87	57
NEA1347_01.013	Sample problem 2 input NJOY87	128
NEA1347_01.014	Sample problem 1 and 2 input MILER	2
NEA1347_01.015	Sample problem 2 input UNITABR	6
NEA1347_01.016	Command file to run NJOY87	43
NEA1347_01.017	Command file to run MILER	25
NEA1347_01.018	Command file to run UNITABR	13
NEA1347_01.019	Sample problem 1 output NJOY87	22204
NEA1347_01.020	Sample problem 2 output NJOY87	20079
NEA1347_01.021	Sample problem 1 output MILER	270
NEA1347_01.022	Sample problem 2 output MILER	390
NEA1347_01.023	Sample problem 2 output UNITABR	341