1. NAME AND TITLE

LPGS: Code System for Calculating Radiation Exposure Resulting from Accidental Radioactive Releases to the Hydrosphere.
 

2. CONTRIBUTORS

U. S. Nuclear Regulatory Commission, Washington, D. C.

Oak Ridge National Laboratory, Oak Ridge, Tennessee.
 

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370/3033.
 

4. NATURE OF PROBLEM SOLVED

LPGS was developed to calculate the radiological impacts resulting from radioactive releases to the hydrosphere. The name LPGS was derived from the Liquid Pathway Generic Study for which the original code was used primarily as an analytic tool in the assessment process.

The hydrosphere is represented by the following types of water bodies: estuary, small river, well, lake, and one-dimensional (1-D) river.

LPGS is designed to calculate radiation dose (individual and population) to body organs as a function of time for the various exposure pathways. The radiological consequences to the aquatic biota are estimated. Several simplified radionuclide transport models are employed with built-in formulations to describe the release rate of the radionuclides. A tabulated user-supplied release model can be input, if desired. Printer plots of dose versus time for the various exposure pathways are provided.
 

5. METHOD OF SOLUTION

The response of the environment to an instantaneous input is generally represented by an analytical function (closed-form solution). Convolution of this analytic function with a release rate function is evaluated to analyze the various releases of radioactivity to the environment.

The mathematical modeling evaluates the time dependent radiation impact arising from the population utilizing water associated pathways. The exposure modes considered are (if pathway exists): 1) consumption of drinking water, 2) consumption of aquatic foods, and 3) recreational exposure through swimming and shoreline activities.
 

6. RESTRICTIONS OR LIMITATIONS

None noted.
 

7. TYPICAL RUNNING TIME

Most problems will execute in less than 30 seconds on the IBM 3033.
 

8. COMPUTER HARDWARE REQUIREMENTS

LPGS is operable on the IBM 360 series or the IBM 370/3033.

A minimum of 340 K bytes of core storage is required with an eight segment overlay structure. One external storage medium is required for the dose factor library.
 

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H compiler and IBM OS/MVS JES2 are required.
 

10. REFERENCE

J. E. White and K. F. Eckerman, "User's Manual for LPGS: A Computer Program for Calculating Radiation Exposure Resulting from Accidental Radioactive Releases to the Hydrosphere," NUREG/CR-2974, ORNL/TDMC-2 (March 1983).
 

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.
 

12. DATE OF ABSTRACT

January 1983.
 

KEYWORDS: INTERNAL DOSE; RADIONUCLIDES; RADIOLOGICAL SAFETY; RADIOACTIVITY RELEASE; ENVIRONMENTAL DOSE; NUCLIDE TRANSPORT