NEA-1067 DIFMOD.

1. NAME OR DESIGNATION OF PROGRAM:  DIFMOD.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The theoretical model was designed to calculate the leaching of radionuclides and the corrosion of cemented waste forms in contact with water or brine. The model computes both the behaviour of specimens in laboratory- scale experiments and provides a forecast of the behaviour of waste  forms in the case of an accidental drowning of a repository.
The mathematical formalism describes leaching and corrosion on the basis of diffusion and dissolution processes and of the chemical reactions by the corrosion.

4. METHOD OF SOLUTION:  Crank-Nicolson difference formalism.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  1000 spatial increments.

6. TYPICAL RUNNING TIME:  Depends on the values of the diffusion constants.

NEA-DB ran the test case included in this package on an IBM 3083 computer. The CPU time required for the different cases varied between 2.5 and 222 seconds.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- B. Kienzler and R.H. Koester:
  Experimental and Theoretical Investigations of Corrosion
  Mechanisms in Cemented Waste Forms.
  Reprint from "Nuclear Technology" Vol. 71, N. 12 (1985), 590-596
- B. Kienzler:
  Mathematical Modelling of the Corrosion and Leaching Behaviour
  of Cemented Waste Forms.
  KfK-3905  (May 1985) (in German)

11. MACHINE REQUIREMENTS:

Main storage requirements for execution on IBM 3083 are 940K bytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  MVS/SP1.3 - JES3.

MVS/XA (IBM 3083).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

          B. Kienzler
          Kernforschungszentrum Karlsruhe
          Institut fuer Nukleare Entsorgungstechnik

File name	File description	Records
NEA1067_01.001	Infomation file	129
NEA1067_01.002	DIFMOD Fortran-77 source	3943
NEA1067_01.003	Mathematical routine DDGT3 source	94
NEA1067_01.004	ZEIT, JOBINF dummy routines	4
NEA1067_01.005	Sample data 1	20
NEA1067_01.006	Sample data 2	20
NEA1067_01.007	Sample data 3	20
NEA1067_01.008	Sample data 4	20
NEA1067_01.009	Sample data 5	20
NEA1067_01.010	Sample data 6	20
NEA1067_01.011	Sample data 7	20
NEA1067_01.012	Sample data 8	20
NEA1067_01.013	Sample data 9	18
NEA1067_01.014	Sample data 10	18
NEA1067_01.015	JCL used at NEA Data Bank	33
NEA1067_01.016	JCL procedures used at NEA Data Bank	43
NEA1067_01.017	Sample JCL from the author	44
NEA1067_01.018	Output of sample problem 1 to 10	13310
NEA1067_01.019	Author's output for Sample problem 9	2357
NEA1067_01.020	Author's output for Sample problem 10	3652
NEA1067_01.021	Plotting program source	526
NEA1067_01.022	Sample data for plotting program	50
NEA1067_01.023	Sample JCL for plotting program from author	25