  Building a new generation of fission reactors in the United States presents
many technical and regulatory challenges. One important challenge is the need
to share and present results from new high-fidelity, high-performance
simulations in an easily usable way. Since modern multiscale, multi-physics
simulations can generate petabytes of data, they will require the development
of new techniques and methods to reduce the data to familiar quantities of
interest (e.g., pin powers, temperatures) with a more reasonable resolution and
size. Furthermore, some of the results from these simulations may be new
quantities for which visualization and analysis techniques are not immediately
available in the community and need to be developed.
  This paper describes a new system for managing high-performance simulation
results in a domain-specific way that naturally exposes quantities of interest
for light water and sodium-cooled fast reactors. It describes requirements to
build such a system and the technical challenges faced in its development at
all levels (simulation, user interface, etc.). An example comparing results
from two different simulation suites for a single assembly in a light-water
reactor is presented, along with a detailed discussion of the system's
requirements and design.
