**RSICC CODE PACKAGE CCC-454**

**1. NAME AND TITLE**

DISPERS: Collection of Mathematical Models for Dispersion in Surface Water and Groundwater.

**2. CONTRIBUTOR**

U. S. Nuclear Regulatory Commission, Washington, D. C through the Energy Science Technology Software Center, Oak Ridge, Tennessee.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV, BASIC II; CDC-6600, IBM PS/2 (C00454MNYCP00).

**4. NATURE OF PROBLEM SOLVED**

DISPERS computes the fate of routinely or accidentally released radionuclides in surface water and groundwater.

**5. METHOD OF SOLUTION**

The mathematical models in DISPERS are straightforward simulations of dispersion with constant coefficients and, in general, simple geometries. The SSTUBE and TUBE programs are useful for two-dimensional dispersion of a continuous source into a river after steady state has been attained. The RIVLAK program also applies to dispersion in a river, but the source may be steady or unsteady. GROUND is used for calculating the dispersion in a three-dimensional aquifer and is most useful for determining the concentration at wells downgradient of a source released from a vertical plane. GRDFLX provides the same function but it considers a horizontal area source.

**8. COMPUTER HARDWARE REQUIREMENTS**

DISPER is operable on the CDC-6600 computers and IBM PS/2 PC.

**9. COMPUTER SOFTWARE REQUIREMENTS**

Fortran IV and BASIC II compilers are required. No executables are included in the package.

**10. REFERENCE**

R. B. Codell, K. T. Key and G. Whelan, "A Collection of Mathematical Models for Dispersion in Surface Water and Groundwater," NUREG-0868 (June 1982).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (1.44 MB) DOS diskette which contains the source codes and the sample problem input for GRDFLX.

**12. DATE OF ABSTRACT**

March 1984, revised 2001.

**KEYWORD:** RADIONUCLIDES