SIERRA ATD
SIERRA ATD is a computer code used for evaluating releases in cases of design-based accidents (from 100s of meters to 10 km), as well as normal effluent releases for sensitive receptors and populations up to 80 km.
Atmospheric Assessment
These are codes used to calculate atmospheric relative concentrations (X/Q) in support of assessments required by Title 10 of the U.S. Code of Federal Regulations (10 CFR) Part 50.