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4SIGHT Manual: A Computer Program for Modelling Degradation of Underground Low Level Waste Concrete Vaults.


pdf icon 4SIGHT Manual: A Computer Program for Modelling Degradation of Underground Low Level Waste Concrete Vaults. (2841 K)
Snyder, K. A.; Clifton, J. R.

NISTIR 5612; 73 p. June 1995.

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB95-231593

Keywords:

building technology; computer models; concretes; corrosion; corrosion of reinforcement; degradation; leaching; radioactive wastes; service life; sulfate attack

Abstract:

A computer program has been written to facilitate performance assessment of concrete vaults used in Low Level Waste (LLW) disposal faciliites. The computer program is a numerical computer model of degradation in concrete. A one-dimensional finite difference equation is used to propagate ions by precipitation/dissolution of available salts. The precipitation/dissolution of salts, in turn, changes the transport properties, which changes the rate of ion transport. The result is a model which incorporates the synergism of multiple degradation mechanisms. This Report is self-contained. It includes the installation instructions, user manual, technical details, and source code. The program was written using a literate programming tool and the "pretty-printing" output of the source code is attached at the end of this report.