1. NAME AND TITLE

SAIPS: Information Processing System for Calculating Neutron Spectra from Measured Reaction Rates.

2. CONTRIBUTOR

Latvian State University, Riga, Latvia, Union of Soviet Socialist Republics.

3. CODING LANGUAGE AND COMPUTER

PL/1, Fortran IV, and Assembler Language; ES EhVM.

4. NATURE OF PROBLEM SOLVED

The SAIPS information and computing system solves the problem of program organization and processing of data sets used for unfolding neutron spectra.

5. METHOD OF SOLUTION

The SAND-II, WINDOWS, RFSP-JUL, and PM programs have been incorporated into SAIPS. SAND-II is an iterative method for neutron flux spectra determination by multiple foil activation. WINDOWS analyzes spectra data foil activation measurements using integral responses, i.e., integrals of weighting functions against the neutron flux. RFSP-JUL calculates the spectral neutron flux density from activity measurements, guess spectrum, and cross section data.

SAIPS contains several additional programs which can be used in calculations, but these duplicate the programs listed above and are more limited. These programs include: CRYSTAL BALL, the solving method of which is borrowed from WINDOWS, and SPECTRA, RFSP, and GIN. The latter three use the same solution algorithm as that used in a more developed form in RFSP-JUL.

Several cross-section libraries have been adapted for SAIPS including ENDF/B-IV, ENDF/B-V, the dosimetric file ZACRSS, and BOSPOR 78. SAIPS contains cross-sections for more than 80 reactions used in unfolding. In performing calculations, it is possible to use the spectra libraries of the SAND-II program as a first approximation.

6. RESTRICTIONS OR LIMITATIONS

7. TYPICAL RUNNING TIME

The following running times were recorded for SAIPS when it was run on an ES 1022 under the control of an OS ES version 4.1 operating system.

8. COMPUTER HARDWARE REQUIREMENTS

SAIPS is operable on an ES EhVM computer using an OS ES 6.1 MVT operating system.

9. COMPUTER SOFTWARE REQUIREMENTS

PL/1, Fortran IV, and Assembler Language compilers are required.

10. REFERENCES

M. Berzonis, Kh. Bondars, and M. Vasilevskis, "Development of a Working Modification of SAIPS, Guidelines for the Programmer," OLS-83-11.

M. A. Berzonis, H. Ya. Bondars, "Methods of Neutron Spectrum Calculation from Measured Reaction Rates in SAIPS. Part 2: Software and Data Input," INDC(CCP)-165/GR (August 1981).

M. Berzonis and Kh. Bondars, "Organization of Programs and Data Sets in SAIPS Software Systems," ORNL-tr-4941.

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source codes, cross section libraries, input spectra, sample problem input and output, and instructions for bringing the SAIPS system on line.

12. DATE OF ABSTRACT

March 1984, revised October 1991.