Optimized assessment of RVIs under pump pulsating conditions

• Published in: The International journal of pressure vessels and piping Vol. 167; pp. 59 - 65
• Main Authors: Je, Sang-Yun, Chang, Yoon-Suk, Kang, Sung-Sik
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2018
• Subjects: Dynamic characteristics; Harmonic response; Pump-induced pulsating pressure; Reactor vessel internals; Dynamic characteristics; Harmonic response; Pump-induced pulsating pressure; Reactor vessel internals
• ISSN: 0308-0161; 1879-3541
• DOI: 10.1016/j.ijpvp.2018.10.009

Optimum design and failure prevention against diverse degradation mechanisms of reactor vessel internals(RVIs) are one of safety concerns in nuclear industries. The present study is to investigate effectiveness of current evaluation procedure of the RVIs under pump pulsating conditions as a part of comprehensive vibration assessment program. At first, pressure propagation analyses were performed subjected to typical steady-state and transient conditions to generate pulsating pressure distributions. Subsequently, modal analyses were conducted to examine effect of coolant modeling on dynamic characteristics. Harmonic response analyses were also carried out to examine effect of integrated assembly and numerical analyses data were compared each other and with limited measured data. As a result, it was proven that the integrated assembly with the coolant modeling could predict further realistic behaviors of RVIs instead of the current sub-component models adopting equivalent added-mass assumption.