Dynamic analysis model of the nuclear fuel element and the tube of heat exchangers in nuclear power installation is treated as a multi-spanned continuous beam.

核动力装置中的燃料元件棒和换热器传热管，常按多跨连续梁模型进行动力分析。

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They had been interested in thorium -- a radioactive element that can fuel nuclear reactors but not be processed into weapons.

VOA: special.2010.10.15