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NESC9850 STAFAN.

STAFAN, Fluid Flow, Mechanical Stress in Fractured Rock of Nuclear Waste Repository

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1. NAME OR DESIGNATION OF PROGRAM:  STAFAN.
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2. COMPUTERS
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Program name Package id Status Status date
STAFAN NESC9850/01 Tested 05-JAN-1989

Machines used:

Package ID Orig. computer Test computer
NESC9850/01 CDC CYBER 176 CDC CYBER 830
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3. DESCRIPTION OF PROGRAM OR FUNCTION

STAFAN (STress And Flow ANalysis) is a two-dimensional, finite-element code designed to model fluid flow and the interaction of fluid pressure and mechanical stresses in a fractured rock surrounding a nuclear waste  repository. STAFAN considers flow behavior of a deformable fractured system with fracture-porous matrix interactions, the coupling effects of fluid pressure and mechanical stresses in a medium containing discrete joints, and the inelastic response of the individual joints of the rock mass subject to the combined fluid pressure and mechanical loading.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

STAFAN does not presently contain thermal coupling, and it is unable to simulate inelastic deformation of the rock mass and variably saturated or two-phase flow in the fractured porous medium system.
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6. TYPICAL RUNNING TIME:
NESC9850/01
To run the test cases included in this package on a CDC CYBER 830 computer, between 29 and 89 CPU seconds were required.
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7. UNUSUAL FEATURES OF THE PROGRAM

STAFAN is particularly suited to application in the study of flow and mechanical deformation processes around repository subsystems.
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8. RELATED AND AUXILIARY PROGRAMS

STAFAN can be used in conjunction with a thermomechanical code such as MATLOC (NESC Summary R9851) or  UTAH2 (NESC Summary R9848) to assess the relative importance of thermomechanical effects and fluid-flow effects on the stress field  and rock deformation. STAFAN can also be used as a front-end code to perform fluid-flow analysis and provide velocity input data to the SCEPTER solute transport codes, such as FTRANS (NESC Summary R9860)  and SWENT (NESC Summary R9811).
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9. STATUS
Package ID Status date Status
NESC9850/01 05-JAN-1989 Tested at NEADB
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10. REFERENCES:
NESC9850/01, included references:
- INTERA Environmental Consultants Inc. :
  STAFAN: Two-Dimensional Code for Fluid Flow and the Interaction of
  Fluid Pressure and Stress in Fractured Rock for Repository
  Performance Assessment
  ONWI-427 (April 1983)
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11. MACHINE REQUIREMENTS:  58K words.
NESC9850/01
133,345 (octal) words of main storage (CM).
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9850/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
NESC9850/01
NOS2.5.1 (CDC CYBER 830).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

         P. Huyakorn
         GeoTrans, Inc.

         M.J. Golis
         Office of Nuclear Waste Isolation
         Battelle Project Management Division
         505 King Avenue
         Columbus, Ohio 43201
Contact
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16. MATERIAL AVAILABLE
NESC9850/01
File name File description Records
NESC9850_01.001 Information file 51
NESC9850_01.002 JCL and control information 12
NESC9850_01.003 STAFAN FORTRAN source 2234
NESC9850_01.004 Sample problem 1 input 23
NESC9850_01.005 Sample problem 2 input 13
NESC9850_01.006 Sample problem 3 input 49
NESC9850_01.007 Sample problem 1 output 2949
NESC9850_01.008 Sample problem 2 output 3651
NESC9850_01.009 Sample problem 3 output 7115
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17. CATEGORIES
  • R. Environmental and Earth Sciences

Keywords: finite element method, fluid flow, fracture properties, ground water, radioactive waste storage, stresses, two-dimensional.