NESC9849 SALT-4.

1. NAME OR DESIGNATION OF PROGRAM:  SALT-4.

3. DESCRIPTION OF PROGRAM OR FUNCTION

SALT4 is a two-dimensional, analytical/displacement-discontinuity code designed to evaluate temperatures, deformation, and stresses associated with underground  disposal of radioactive waste in bedded salt. SALT4 takes into account viscoelastic behavior in the pillars adjacent to excavations, transversely isotropic elastic moduli such as those exhibited by bedded or stratified rock, and excavation sequence. SALT4 can be used for parameter sensitivity analyses of two-dimensional, repository-scale, thermal and thermomechanical response in bedded salt during the excavation, operational, and post-closure phases. It is especially useful in evaluating alternative patterns and sequences of excavation or waste canister placement.

4. METHOD OF SOLUTION

In SALT4, the temperature distribution and associated thermal stresses are approximated by analytic solutions for a line heat source in an elastic medium. The mechanical effects  due to excavationof the repository openings are treated by the displacement-discontinuity method.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Although SALT4 was designed for analysis of bedded salt, it is also applicable to crystalline rock if the creep calculation is suppressed. The main disadvantage of SALT4 is that some of the assumptions made, i.e. temperature-independent material properties, render it unsuitable for canister-scale analysis or analysis of lateral deformation of the pillars.

6. TYPICAL RUNNING TIME:

NEA-DB ran the test case included in this package on a  CDC CYBER 830 computer in 492 seconds of CPU time.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

The SALT4 model can serve as a valuable auxiliary to the more sophisticated SCEPTER finite-element  and finite-difference thermal and thermomechanical codes by helping  to resolve issues which arise from the finite calculational domain inherent in the latter approaches. The finite-element and finite-difference codes may require a very large number of nodes to  circumvent effects of the finite domain inherent in their application. Because of the nature of the influence functions used in the SALT4 formulation, it models a semi-infinite domain and is therefore not subject to this limitations.

10. REFERENCES

- E.N. Lindner, C.M. St. John, R.D. Hart,
  A User's Manual and Guide to SALT3 and SALT4: Two-Dimensional
  Computer Codes for Analysis of Test-Scale Underground Excavation
  for the Disposal of Radioactive Waste in Bedded Salt Deposits,
  BMI/ONWI-502, February 1984.

- INTERA Environmental Consultants Inc. :
  SALT4: A Two-Dimensional Displacement Discontinuity Code for
  Thermomechanical Analysis in Bedded Salt Deposits
  ONWI-429 (April 1983)

11. MACHINE REQUIREMENTS:  35K words.

The test case required 77,400 (octal) words of main storage for execution on a CDC CYBER 830 comnputer.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NOS2.5.1 (CDC CYBER 830).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

          M.J. Golis
          Office of Nuclear Waste Isolation
          Battelle Project Management Division
          505 King Avenue, Columbus, Ohio 43201

File name	File description	Records
NESC9849_01.001	Information file	44
NESC9849_01.002	JCL and control information	10
NESC9849_01.003	SALT-4 FORTRAN source	1356
NESC9849_01.004	Sample problem input	35
NESC9849_01.005	Sample problem output	2048