1. NAME AND TITLE

NUCCON: A Code System for Calculation of Time-Dependent Nuclide Concentrations, Activity, Gamma-Ray Dose Rate and Biological Hazard Potential of Fusion Reactor Materials Due to Neutron Irradiation.

2. CONTRIBUTOR

Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Berlin, Federal Republic of Germany.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; SIEMENS 7880.

4. NATURE OF PROBLEM SOLVED

NUCCON calculates the changes in the concentration and activation for a D-T fusion reactor material under neutron irradiation of the parent and daughter nuclides of a given activation chain for any given period in arbitrary time-steps.

Based on PSR-059/MATEXP, NUCCON solves ordinary differential equations. The linking of the parent nuclides to the daughter nuclides and their physical parameters are read as an activation chain with the following information for every nuclide in the chain: daughter nuclides resulting from any of six possible neutron reactions, a daughter nuclide resulting from a possible decay of the parent nuclide, the cross-sections of the neutron reactions, and the decay constants. The activation chain can have a maximum of 50 nuclides.

5. METHOD OF SOLUTION

NUCCON coordinates ten program subroutines. Subroutine MATEXP solves the differential equation system and determines the nuclide concentrations. Subroutine CHAIN forms the transfer coefficient matrix A. Subroutine CALCRO calculates or reads the normalized neutron reaction transfer values which are taken into consideration in the coefficients A_i,j. Subroutine ACTDOS calculates the specific activity, the interval activity, the gamma-ray dose rate and the BHP values.

6. RESTRICTIONS OR LIMITATIONS

The number of changes calculated for any given period in arbitrary time-steps is 400.

The maximum number of nuclides in an activation chain is 50. Every nuclide of the chain can be linked to the other chain members by a maximum of 6 neutron reactions, and radioactive decay.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for NUCCON.

8. COMPUTER HARDWARE REQUIREMENTS

NUCCON was designed to operate on the SIEMENS 7880 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

J. Gruber, B. Lehmann, and J. Schneider, "NUCCON: A Program for Calculating the Neutron Activation of the Time Dependent Nuclide Concentrations, the Activity, the Gamma-ray Dose Rate and the Biological Hazard Potential of Fusion Reactor Materials due to Neutron Irradiation," HMI-B 312 (September 1979).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

January 1983; December 1984.