RSICC Home Page ACTIV

RSICC CODE PACKAGE PSR-590

 

1.         NAME AND TITLE

ACTIVSandwich Detector Activity from In-Pile Slowing-Down Spectra Experiment.

 

2.         CONTRIBUTOR

            Centro di Studi Nucleari della Casaccia, Roma, Italy through the OECD Nuclear Energy Agency Data Bank, Issy-les-Moulineaux, France.

3.         CODING LANGUAGE AND COMPUTER

            Fortran IV; IBM 370 Series (P00590I037000).

 

4.         NATURE OF PROBLEM SOLVED

ACTIV calculates the activities of a sandwich detector, to be used for in-pile measurements in slowing-down spectra below a few keV. The effect of scattering with energy degradation in the filter and in the detectors has been included to a first approximation.

 

5.         METHOD OF SOLUTION

An iterative procedure is used: the calculation starts with a flux guess in which one assumes that each measured reactivity difference depends on the principal resonance only. The secondary resonance contribution is computed through the iterative process. For self-shielded cross-section calculations the model of Pearlstein and Weinstock (ref. 3) is used. The neutron spectrum can optionally be constant or 1/E inside each finite energy group relative to the resonance considered.

 

6.         RESTRICTIONS OR LIMITATIONS

Maximum number of energy groups: 60.

 

7.         TYPICAL RUNNING TIME

            Case dependent.

 

8.         COMPUTER HARDWARE REQUIREMENTS

                        IBM 360 or IBM 370 mainframe.

 

9.         COMPUTER SOFTWARE REQUIREMENTS

            MVT.

 

10.       REFERENCES

a) Included Documentation:

- L.Bozzi, F.Caporella, M.Cosimi: Il Codice ACTIV CNEN - RT/F1(73)35.

b) Background Documentation:

- L.Bozzi, F. Caporella, M.Cosimi, M.Martini: An Interpretational Technique of Sandwich Activation Measurements Reprint from Nucl.Instr.Meth. 119(1974) 599 - 604.

-S.Pearlstein, E.V.Weinstock:, Nucl.Sci.Eng. 29(1967) 28.

 

11.       CONTENTS OF CODE PACKAGE

            The package is distributed on a CD with a compressed zip file including source files, JCL, documentation, and test cases.

 

12.       DATE OF ABSTRACT

            August 2013.

 

KEYWORDS: ITERACTIVE METHODS; NEUTRON DETECTORS; NEUTRON SPECTRA; SCATTERING; SLOWING-DOWN