A partial but full-size mock-up test of practical steam-generator U-bend tubes in nuclear power plants has been carried out, where the test model has been set in a HFCF-123 fluid two-phase flow loop. U-bend tubes are supported with so-called "Anti vibration Bars (AVB)", which have two types of AVBs in Japan, 7-span type and 5-span one. Both types of AVBs have been examined and it is found that tubes with AVB supports shows no large amplitude vibration up to 150% flow rate to the practical condition. Basic data for the fluidelastic instability are obtained when some tubes have been set to be flexible at some contact points with AVBs.
CITATION STYLE
Nakamura, T., Hirota, K., Tomomatsu, K. ichi, Takai, M., Iwase, T., Uwagawa, S. ichi, … Saito, T. (2002). Advanced estimation on fluidelastic instability of U-bend tube bundle of steam generator (2nd report, fluidelastic vibration by HFCF-123 fluid two-phase flow). Nippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 68(4), 1064–1072. https://doi.org/10.1299/kikaic.68.1064
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