1. NAME AND TITLE

LADTAP II: Code System for Calculating Radiation Exposure to Man from Routine Release of Nuclear Reactor Liquid Effluents.

DATA LIBRARY

RG1109/R1: Dose rate conversion factors for both internal and external exposure to radiation (adults, teenagers, children and infants).

2. CONTRIBUTORS

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

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

Pacific Northwest Laboratory, Richland, Washington.

3. CODING LANGUAGE AND COMPUTER

Fortran; IBM (C00363I303300), CDC (C00363760001); VAX (C00363D078000).

4. NATURE OF PROBLEM SOLVED

LADTAP II calculates the radiation exposure to man from potable water, aquatic foods, shoreline deposits, swimming, boating, and irrigated foods, and also the dose to biota. Doses are calculated for both the maximum individual and for the population and are summarized for each pathway by age group and organ. It also calculates the doses to certain representative biota other than man in the aquatic environment such as fish, invertebrates, algae, muskrats, raccoons, herons, and ducks using models presented in WASH-1258.

5. METHOD OF SOLUTION

LADTAP II implements the radiological exposure models described in US NRC Regulatory Guide 1.109, Rev. 1 (Appendix A) for radioactivity releases in liquid effluent. The usage factors contained in Regulatory Guide 1.109 have been included as standard assumptions but may easily be replaced with site-specific data.

Up to 200 nuclides may be included in the release source term. Reconcentration, if any, of each nuclide is determined from one of the three models (chosen by the user) available in the program, or the user may input the reconcentration factor if none of the models available in the program is appropriate. Available options include complete mixing, partial mixing, or the plug-flow model. These models are described in US NRC Regulatory Guide 1.113 (Appendix B). A companion dose factor library is searched to obtain appropriate dose factors for each age group for each nuclide in the release input.

6. RESTRICTIONS OR LIMITATIONS

Limits for the number of dose receptor locations, etc., to be input are given in the input description. Many constant parameter values are stored in block DATA and once a parameter in common block DATA is altered, it remains at that value until altered further.

7. TYPICAL RUNNING TIME

The sample problem executes in 5 seconds on the IBM 360/91. Sample problem 1 executed on the VAX 8600 in about 1.30 minutes, and sample cases 2 and 3 each executed in less than 30 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

LADTAP II is operable on IBM 360/370, 3033, CDC, or VAX computers. Approximately 60,000 words of memory are required. A sequential access device is required for the dose factor library.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H Extended compiler is required for the IBM version. The CDC version requires a Fortran IV compiler. The VAX VMS Fortran compiler (version 4.6) was used on the VAX 8600 to execute the sample cases.

10. REFERENCES

a. Included in package:

D. B. Simpson and B. L. McGill, "User's Manual for LADTAP II A Computer Program for Calculating Radiation Exposure to Man from Routine Release of Nuclear Reactor Liquid Effluents," NUREG/CR-1276, ORNL/NUREG/TDMC-1 (March 17, 1980). [Includes 10 CFR Part 50, Appendix I, NRC Regulatory Guide 1.109, Rev. 1 (October 1977) and NRC Regulatory Guide 1.113, Rev. 1 (April 1977).]

D. L. Strenge, R. A. Peloquin and G. Whelan, "LADTAP II - Technical Reference and User Guide," NUREG/CR-4013, PNL-5270 (April 1986).

b. Background information:

U.S. Atomic Energy Commission, "Final Environmental Statement Concerning Proposed Rule Making Action Vol. 2 Analytical Models and Calculations (Appendix F)." WASH-1258 (1973).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents (10.a) and one (1.2MB) DOS diskette which contains the source codes, sample problem input and output.

12. DATE OF ABSTRACT

February 1982; revised January 1984 and January 1989.

KEYWORDS: NUCLIDE TRANSPORT; RADIATION ENVIRONMENT; RADIOLOGICAL SAFETY; RADIOACTIVITY RELEASE; ENVIRONMENTAL DOSE