RADTRAD-NAI is NAI's version of RADTRAD, a computer code developed by the NRC for radiological dose analysis. The code is suitable for dose analysis under the new Alternative Source Term (AST) Guidelines (NUREG-1465) as well as the TID-14844 Guidelines.

RADTRAD-NAI is available to customers as a local installation or via the internet using a web-based interface. NAI maintains a controlled version of RADTRAD-NAI on a central server. Each individual customer accesses this controlled version directly through the internet using a web browser for input and output. The web input interface offers both file submittal of input or a form-based user interface for input of data. Customers no longer need to maintain the software on their own servers or personal computers. There is no longer a need for customers to check versions or ensure that they have loaded the latest version of the software.

The code was developed, verified and validated under NAI's 10CFR50 Appendix B QA Program. NAI provides continued maintenance of the code under the same QA Program, including error reporting.

Examples of improvements in the web-based code include:

1. Correction of identified errors in RADTRAD, as described in our Error Report to the NRC.
2. Addition of capability to track pH level in suppression pools/sumps.
3. Addition of capability to vary the free volume in a compartment with time (e.g., to account for water level variation in steam generators).
4. Addition of capability to delete compartments, flow paths, etc. with the web-based GUI.

For more information please contact Jim Harrell by e-mail at Jim.Harrell@numerical.com or by phone at (919)465-7230 x227.