CCC-0604 CHAINS-PC.

1. NAME OR DESIGNATION OF PROGRAM:  CHAINS-PC (Code System to Compute
Atom Density of Members of a Single Decay Chain).

3. DESCRIPTION OF PROGRAM OR FUNCTION

CHAINS computes the atom density of members of a single radioactive decay chain. The linearity of the Bateman equations allows tracing of interconnecting chains by manually accumulating results from separate calculations of single chains. Re-entrant loops can be treated as extensions of a single chain. Losses from the chain are also tallied.

4. METHOD OF SOLUTION

The Bateman equations are solved analytically using double-precision arithmetic. Poles are avoided by small alterations of the loss terms. Multigroup fluxes, cross sections, and self-shielding factors entered as input are used to compute the  effective specific reaction rates. The atom densities are computed at any specified times.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of 100 energy groups, 100 time values, 50 members in a chain.

6. TYPICAL RUNNING TIME

RSIC executed the sample problem in 2 seconds on a PC 486, running 33 Megahertz.

The sample problem was run at the NEA-DB on a 66-MHz PC/80486 in about 0.3 seconds of elapsed time.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- W.B. Henderson:
  Program CHAINS
  NMP-856 (March 1967).

11. MACHINE REQUIREMENTS

The IBM PC version requires 76 Kbytes of memory and an 80x87 math coprocessor. RSIC executed the sample problem in 2 seconds on an PC 486, running 33 megahertz.

The program was compiled and executed by NEA-DB on a DELL 486L/66Mhz with processor 80486 and 16 MB of RAM. The file size of the executable version created, including the stub loader that binds the 386/DOS extender into the executable is 250 KBytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The IBM PC version requires the Lahey F77L or a suitable alternative compiler capable of accepting NAMELIST input.

The program CHAINS was implemented under MS-DOS 6.0. The source code was compiled with the Lahey compiler F77L-EM/32, version 5.11 and linked with the linker 386LINK.

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:   General Electric Corp., Cincinnati, Ohio
                under sponsorship of DOE-NE and the
                National Energy Software Center, Argonne, Illinois
                through the DOE ESTSC, Oak Ridge, Tennessee, USA

File name	File description	Records
CCC0604_01.001	CHAINS-PC Information file	98
CCC0604_01.002	CHAINS-PC source code file	301
CCC0604_01.003	Batch file to create the CHAINS executable	12
CCC0604_01.004	CHAINS-PC executable	0
CCC0604_01.005	CHAINS-PC sample input data	49
CCC0604_01.006	CHAINS-PC sample output data	685
CCC0604_01.007	DOS file-names	6