Neutronics/thermal-hydraulics/fuel-performance coupling for light water reactors and its application to accident tolerant fuel

Xu, Xiaobei; Liu, Zhouyu; Wu, Hongchun; Cao, Liangzhi

doi:10.1016/j.anucene.2021.108809

Cited by 8 publications

(1 citation statement)

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“…As a result, a stable and efficient solution is needed for the whole HTR nuclear power plant. Traditional methods for solving coupled systems are the operator splitting method [2] and the Picard iteration method [3,4], but these two methods cannot be competent for such large-scale and complex problems, due to their weak stability and linear convergence rate. The JFNK (Jacobian-free Newton-Krylov) method is a promising method to solve this challenging issue, which could realize all the physical field synchronization convergence and has a higher convergence rate and stronger stability than the traditional methods [5].…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Zhang

et al. 2023

Energies

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

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