Surveillance and diagnostics of the beam mode vibrations of the Ringhals PWRs
- Applied Physics to Natural Resources Dept., Technical Univ. of Madrid UPM, Rios Rosas 21, 28003 Madrid (Spain)
- Dept. of Nuclear Engineering, Chalmers Univ. of Technology, SE-412 96 Goeteborg (Sweden)
- Vattenfall Ringhals AB, S-432 85 Vaeroebacka (Sweden)
Surveillance of core barrel vibrations has been performed in the Swedish Ringhals PWRs for several years. This surveillance is focused mainly on the pendular motion of the core barrel, which is known as the beam mode. The monitoring of the beam mode has suggested that its amplitude increases along the cycle and decreases after refuelling. In the last 5 years several measurements have been taken in order to understand this behaviour. Besides, a non-linear fitting procedure has been implemented in order to better distinguish the different components of vibration. By using this fitting procedure, two modes of vibration have been identified in the frequency range of the beam mode. Several results coming from the trend analysis performed during these years indicate that one of the modes is due to the core barrel motion itself and the other is due to the individual flow induced vibrations of the fuel elements. In this work, the latest results of this monitoring are presented. (authors)
- Research Organization:
- American Nuclear Society, Inc., 555 N. Kensington Avenue, La Grange Park, Illinois 60526 (United States)
- OSTI ID:
- 22105690
- Resource Relation:
- Conference: PHYSOR 2012: Conference on Advances in Reactor Physics - Linking Research, Industry, and Education, Knoxville, TN (United States), 15-20 Apr 2012; Other Information: Country of input: France; 9 refs.
- Country of Publication:
- United States
- Language:
- English
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