Journal Article

A Quasi Time-Domain Method for Fatigue Analysis of Reactor Pressure Vessels in Floating Nuclear Power Plants in Marine Environments

Qu, Xiangiang, Zhang, Meng, Li, Huanming, Ma, Fuxuan

2024

Overview

The reactor pressure vessel (RPV) in onshore nuclear power plants is typically analysed for fatigue life by considering the temperature, internal pressure, and seismic effects using a simplified time-domain fatigue analysis. In contrast, the frequency-domain fatigue analysis method is commonly employed to assess the fatigue life of ship structures. The RPV of a floating nuclear power plant (FNPP) is subjected to a combination of temperature, internal pressure, and wave loads in the marine environment. Consequently, it is essential to effectively integrate the frequency-domain fatigue analysis method used for hull structures with the time-domain fatigue analysis method for RPVs in FNPPs or, alternatively, to develop a suitable method that effectively accounts for the temperature, internal pressure, and wave loads. In this study, a quasi-time-domain method is proposed for the fatigue analysis of RPVs in FNPPs. In this method, secondary components of marine environmental loads are filtered out using principal component analysis. Subsequently, the stress spectrum induced by waves is transformed into a stress time history. Fatigue stress under the combined influence of temperature, internal pressure, and wave loads is then obtained through a stress component superposition method. Finally, the accuracy of the quasi-time-domain method was validated through three numerical examples. The results indicate that the calculated values obtained by the quasi-time-domain method are slightly higher than those obtained by the traditional time-domain method, with a maximum deviation of no more than 24%. Additionally, the computation time of the quasi-time-domain method is reduced by 98.67% compared to the traditional time-domain method.

• Publisher: MDPI AG
• Subject: Accuracy / Design techniques / Fatigue / Fatigue life assessment / Fatigue testing machines / Floating / floating nuclear power plant / Frequency analysis / Frequency domain analysis / frequency-domain fatigue analysis method / Internal pressure / Load / Loads (forces) / Marine environment / Materials / Materials fatigue / Methods / Nuclear energy / Nuclear power plants / Nuclear reactor components / Nuclear reactors / Offshore structures / Pressure / Pressure effects / Pressure vessels / Principal components analysis / quasi-time-domain fatigue analysis method / reactor pressure vessel / Reactors / Seismic activity / Seismic effects / Stress analysis / Temperature / Time domain analysis / time-domain fatigue analysis method