Evaluation of Design and Monitoring Requirements for Vibrations in Safety-Related Fluid Systems

Adobe Acrobat PDF Document - on 4/5/23 at 2:27 PM
- Adobe Acrobat PDF Document on 2/13/23 at 3:03 PM

In order to reach a better understanding of countries’ different approaches to the evaluation of vibrations detected in piping systems and components, the NEA Committee on the Safety of Nuclear Installations (CSNI) Working Group on Integrity and Ageing of Components and Structures (WGIAGE) initiated work focused on the vibrations of reactor internals and small piping connected to the primary piping. The requirements for managing vibrations in safety-related fluid systems were explored by means of a questionnaire, which has three main areas: design requirements, vibration monitoring and reactor pressure vessel (RPV) vibrations. The questions focused on vibration screening criteria, design requirements, proactive vibration programme controls, and the associated regulatory requirements for safety-related fluid systems and their components. The entire piping and component lifespan was addressed in the questionnaire, including design and construction, pre-operational monitoring programmes, and surveillance during operation. Operating experience with vibration-induced failures and mitigation of the most problematic vibration issues was also shared.