From 1 to 2 November 2022, WANO Moscow Centre together with Kudankulam NPP (India) conducted a workshop on the topic ‘High vibration problems of the high-speed turbogenerator (3000 RPM) stator winding end part and their solutions’. The workshop was conducted remotely, on the Telebridge platform, in videoconference format. The working languages were Russian and English.
The Workshop purpose was to exchange experience of turbogenerator maintenance at nuclear power plants.
The Workshop was attended by experts of the operating organization Rosenergoatom JSC, electrical department managers and their deputies, lead engineers and chief specialists for turbogenerator operations from Belarusian NPP, Paks NPP МВМ Ltd, Bushehr NPP, Beloyarsk NPP, Kalinin NPP, Kola NPP, Leningrad NPP, Novovoronezh NPP, Rostov NPP, Smolensk NPP, deputy chief designers and lead specialists of Power Machines association, representatives of WANO Moscow Centre Youth Movement.
The Workshop was opened by WANO Moscow Centre Director Vasily Aksenov, who noted the importance of information exchange between designers – specialists of manufacturing factory Power Machines and plant personnel, such a meeting gives a good opportunity to exchange experience and technical ideas, to discuss suggestions for reducing stator winding end part vibration in high-speed turbogenerator. Kudankulam NPP Plant Manager Mr. R.S. Sawant addressed a welcome speech to the participants, he noted that the meeting of technical specialists is an important source of information for enhancement of the plant equipment operational reliability, and expressed confidence that during the dialogue and discussions a lot of useful information will be received for solution of complicated issues occurring during turbogenerator operation and maintenance.
The Workshop participants prepared presentations and discussed the following technical topics:
• Operating experience of turbogenerators manufactured by Electrosila factory (high-speed 3000 RPM turbogenerators).
• Analysis of end winding busbar vibration, allowed limits for generators of similar capacity, natural frequency of oscillations, measurement frequency and corrective actions.
• Factors affecting end winding vibration, including reactive power, stator winding cooling water temperature.
• Turbogenerator maintenance methods adopted in international practices.
The presentations of the participants, their answers to questions asked at the round table were made in open atmosphere, all participants highly appreciated the information received during the Workshop, and high quality of simultaneous translation, and expressed their wish to take part in WANO events on the topic in future.
Presentation materials were distributed to all Workshop participants.