Nuclear Power Plant Licensing Assistance

These computer codes provide tools for the U.S. Nuclear Regulatory Commission to perform the confirmatory calculations with respect to the regulations in various parts of Title 10 of the U.S. Code of Federal Regulations (10 CFR) and regulatory guides for licensing review and evaluations. 


Perspective of freight train on railway in summer (source:

The NRC Radioactive Material Transport (NRC-RADTRAN) computer code is used for risk and consequence analysis of radioactive material (RAM) transportation. A variety of RAM is transported annually within this country and internationally. The shipments are carried out by overland modes (mainly truck and rail), marine vessels, and aircraft. Transportation workers and persons residing near or sharing transportation links with these shipments may be exposed to radiation from RAM packages during routine transport operations; exposures may also occur as a result of accidents.



NRCDose is a user-friendly graphical user interface (GUI) for the LADTAP Il, GASPAR II, and XOQDOQ programs which operate under all Microsoft Windows™ platforms. These Fortran codes implement NRC’s current requirements for As Low As Reasonably Achievable (ALARA) for radioactive effluents from nuclear power plants. NRCDose allows the user to enter and retrieve data through a series of windows dialogs, making the use of the program much more user-friendly and efficient than its original design.


Control room

HABIT v2.2 is a suite of computer codes to assist in evaluating Light-Water Reactor (LWR) control room habitability in the event of accidental spills of toxic chemicals. It produces files containing tabular output that can be printed, viewed, or imported into spreadsheet programs for further uses.

HABIT v2.2 also uses a heavy-gas dispersion model, unifies the input screen of EXTRAN, DEGADIS, and SLAB, and incorporates Bitter Mc-Quaid calculation to determine which model needs to run and plot the concentration versus time outputs.


Clean water

The Gaseous and Liquid Effluents (GALE) series of codes consists of four codes that calculate the gaseous and liquid effluent releases from pressurized-water reactors (PWRs) and boiling-water reactors (BWRs). These are:


A waterway near the Shearon Harris Nuclear Power Plant in North Carolina. Credit Nuclear Regulatory Commission -
SNAP consists of a suite of integrated applications designed to simplify the process of performing engineering analysis. RADTRAD is a licensing analysis code used to show compliance with nuclear plant siting criteria.