CCC-0612 ALPHN.

1. NAME OR DESIGNATION OF PROGRAM:  ALPHN.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The ALPHN program calculates the (alpha,n) neutron production rate in a mixture of chemical species receiving alpha-particles from alpha-emitting actinides.

4. METHOD OF SOLUTION

The user specifies the mass fractions of the chemical species in the mixture and the curies of each actinide. Other basic data (stopping powers and thick-target yields) are supplied from the data libraries distributed with the program. The method of West is used to calculate the neutron yield for a single alpha-particle energy. The total neutron production rate per canister is the summation taken over all actinides i, and actinide i is assumed to emit a-particles with a single average initial energy.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The total mixture yield calculated is a source term and does not take into account the shielding effect of the glass. For a given glass composition, the user can calculate up to eight cases simultaneously.

6. TYPICAL RUNNING TIME

Run time for a typical problem containing 20  chemical species, 24 actinides, and 8 decay times was 34 seconds on  an IBM AT personal computer.

ALPHN was run at the NEA-DB on a 66-MHz PC/80486. Only  a few tenths of a second of elapsed time are needed to execute the "test case".

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

Data Libraries
- STPN6A.OU3: Stopping powers and yields.
- CURIES.IN9: Alpha curies of each actinide.

10. REFERENCES:

- R. Salmon and O.W. Hermann:
  ALPHN - A Computer Program for Calculating (alpha,n) Neutron
  Production in Canisters of High-Level Waste
  ORNL/TM-12239 (October 1992).

11. MACHINE REQUIREMENTS

ALPHN was developed on IBM personal computers. The executable included in the package was created on an  IBM PC 486 compatible with 640 kB memory and a math co-processor.

The sample problems were run at the NEA-DB on a PC DELL 466/L (processor 80486, 66 MHz, 16 Mbytes of installed RAM). The size of the executable file produced using the Microsoft compiler and linker is 41 Kbyte, whereas the size of the executable  file created using the Lahey compiler and linker (using the stub loader) is 277 Kbytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The executable included in the package was created using the Ryan-McFarland Version 2.10 compiler under DOS Version 5.0.

ALPHN was run under MS-DOS 6.2. Two different executable files were created, compiled and linked respectively with: - the Lahey F77L-EM32 FORTRAN 77 compiler version 5.20 and the Lahey linker 386LINK version 5.1 and - the Microsoft FORTRAN 77 compiler version 5.10 and linker version 5.15.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.
Developed by:   Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA

File name	File description	Records
CCC0612_01.001	ALPHN Information File	190
CCC0612_01.002	Source file of the ALPHN program	416
CCC0612_01.003	Batch file to create the MicroSoft exec.	34
CCC0612_01.004	Batch file to create the Lahey executable	35
CCC0612_01.005	ALPHN executable (MicroSoft compiler+linker)	0
CCC0612_01.006	ALPHN executable (Lahey compiler+linker)	0
CCC0612_01.007	Sample input file	22
CCC0612_01.008	Input file w/ stopping power and yield data	0
CCC0612_01.009	Input file w/ alpha curies per actinide	25
CCC0612_01.010	Sample output file	887
CCC0612_01.011	Lahey file for run-time errors (English)	0
CCC0612_01.012	DOS file-names	11