A Modified JFNK for Solving the HTR Steady State Secondary Circuit Problem

A nuclear power plant is a complex coupling system, which features multi-physics between reactor physics and thermal-hydraulics in the core, as well multi-circuit primary circuit secondary by shared steam generator (SG). Especially pebble-bed modular HTR plant, different supply modules are further coupled together through main pipes related equipment circuit, since special configuration of multiple connects to turbine. The JFNK (Jacobian-Free Newton–Krylov) method provides promising framework solve whole problem, due its excellent convergence rate strong robustness. In this work, was modified applied steady-state calculation plays an important role simultaneous solutions for plant. components included SG, turbine, condenser, feed pump, high/low-pressure heat exchanger, deaerator, extraction from results showed that can effectively steady state issue circuit. Moreover, could converge within wide range initial values, indicating