S5K leverages the power of SIMULATE5, the industry standard in nodal reactor analysis. Including cutting-edge neutronic methods and advanced engineering features, S5K delivers unparalleled fidelity with production-level run times.

S5K solves the transient three-dimensional, multi-group neutron diffusion equations, including models for delayed neutron precursors. Intranodal flux and power distributions within each node are used to compute the power, fuel temperatures, and enthalpies for every axial level of every fuel pin in the core during transients.

Each fuel assembly in the core is explicitly represented in the core thermal-hydraulics. For BWR operational transients, vessel and steam line models are capable of simulating acoustic effects in the steam line due to sudden valve closures or openings.

S5K helps operating utilities address emerging regulatory issues like pin enthalpy and delta-CPR limits. An explicit fuel pin conduction model explicitly tracks the complete radial distribution of fuel temperatures and enthalpies in every fuel pin in the core throughout a transient. S5K is capable of evaluating margin to thermal limits (such as delta CPR) during plant transients, providing licensing-grade support to core designers.

With a robust neutronics engine and advanced thermal hydraulic capabilities, S5K is well-suited for transients with a strong neutronic/thermal-hydraulic coupling. Its seamless linkage with SIMULATE makes S5K the perfect tool for the study of operational transients typically analyzed on a cycle-specific basis. Core designers simply generate the proposed core model, and direct S5K to evaluate the prescribed set of transients as part of the core reload design licensing process.