VIBRACE POTRUBÍ VVER 1000

Abstract cze:
Abstrakt: Vibrations of VVER 1000 pipeline. This contribution explains the causes of highfrequency pipeline vibrations between regulation valves and 1000 MW turbine body installed at NPP Temelin. We have carried out a frequency-modal analysis of this pipeline which showed abnormal vibrations in the course of pre-operational tests. Moreover, there was carried out a frequency- modal analysis of the diffuser internal part which is obviously the root of increasing vapor flow's influence on the pipeline and on entire turbo-set. The analyses results have been compared with records on the measurements that were done during the mentioned tests by the SKODA Vyzkum s. r. o. staff. Since the valve cones modifications have already succeeded in cutting down the vibrations considerably, we propose a way how to reach further improvement if such need will be.

Abstract eng:
Abstract: Vibrations of VVER 1000 pipeline. This contribution explains the causes of highfrequency pipeline vibrations between regulation valves and 1000 MW turbine body installed at NPP Temelin. We have carried out a frequency-modal analysis of this pipeline which showed abnormal vibrations in the course of pre-operational tests. Moreover, there was carried out a frequency- modal analysis of the diffuser internal part which is obviously the root of increasing vapor flow's influence on the pipeline and on entire turbo-set. The analyses results have been compared with records on the measurements that were done during the mentioned tests by the SKODA Vyzkum s. r. o. staff. Since the valve cones modifications have already succeeded in cutting down the vibrations considerably, we propose a way how to reach further improvement if such need will be.

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