The RELAP5 series of codes has been developed at Idaho National
Laboratory; RELAP5-3D is the latest code version in the series. While RELAP5
was originally developed to model accidents and operational transients in light
water reactor systems, the general nature of the code allows it to be used to
simulate a wide variety of hydraulic and thermal transients in both nuclear and
non-nuclear systems that can be stationary or moving. More than 25 working
fluids are available in the code, including water, gases, liquid metals, refrigerants,
and molten salts; 11 noncondensable gases are also available.
This brief paper describes
and illustrates the performance of three key features in the RELAP5-3D
computer code: the multidimensional hydrodynamic model, the
multi-dimensional reactor kinetics model, and the BPLU matrix solver.
A more detailed RELAP5–3D paper is available.