NESC9667 UCBNE25.

UCBNE25, Radionuclide Migration in Geologic Media

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: UCBNE25.

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2. COMPUTERS

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Program name	Package id	Status	Status date
UCBNE25	NESC9667/01	Tested	22-NOV-1988

Machines used:

Package ID	Orig. computer	Test computer
NESC9667/01	CDC 6600	CDC CYBER 830

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3. DESCRIPTION OF PROGRAM OR FUNCTION

UCBNE25 estimates the maximum concentration of nuclides occuring during the migration of three- member radionuclide chains in geologic media without axial dispersion. Unlike other migration codes, the release rate in UCBNE25 is the independent variable, and time is the dependent variable. The extrema in concentrations are determined without having to calculate the entire concentration history. The program assumes one-dimensional water transport and sorption equilibrium for the nuclides in the soil and in the water. The water velocity is held constant, and the leach times are smaller than the half-lives of the nuclides involved. UCBNE25 calculates for each nuclide the time of the maxima at a specified position, the maximum dimensionless concentration, the corresponding water dilution rate, and the contamination time for that position. The closed form solutions can be easily checked by hand, making it a useful calibration tool for other codes.

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4. METHOD OF SOLUTION

The method concentrates on the estimation of the extrema positions in space at a fixed time and their occurrence at a fixed position.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME:

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS: UCBNE25 was developed at Lawrence Berkeley Laboratory.

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9. STATUS

Package ID	Status date	Status
NESC9667/01	22-NOV-1988	Tested at NEADB

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10. REFERENCES:

NESC9667/01, included references:

- T.H. Pigford, P.L. Chambre et al. :
  Migration of Radionuclides Through Sorbing Media Analytical
  Solutions - II
  ONWI-360 (LBL-11616) Vols. I and II (October 1980)

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11. MACHINE REQUIREMENTS:

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC9667/01	FORTRAN

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: NOS.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

          G. Kilshtok
          Office of Nuclear Waste Isolation
          Battelle Project management Division

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16. MATERIAL AVAILABLE

NESC9667/01

File name	File description	Records
NESC9667_01.001	Information file	34
NESC9667_01.002	JCL and control information	10
NESC9667_01.003	UBCNE25 FORTRAN source	382
NESC9667_01.004	Sample problem input	7
NESC9667_01.005	Sample problem output	506

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17. CATEGORIES

R. Environmental and Earth Sciences

Keywords: decay, radioisotopes, radionuclide migration, sorption, transport theory.