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    • 6. 发明授权
    • Method and apparatus for measuring gap between adjoining fuel rods of
fuel assembly
    • 用于测量燃料组件相邻燃料棒间隙的方法和装置
    • US5282229A
    • 1994-01-25
    • US834191
    • 1992-02-12
    • Masaru UkaiHideaki OkamiKozo SatoKazuya Okamoto
    • Masaru UkaiHideaki OkamiKozo SatoKazuya Okamoto
    • G01R33/44G01V3/11G21C17/06G21C17/00
    • G01R33/44G21C17/06
    • A gap between adjoining fuel rods arranged in a fuel assembly is measured by setting a measuring device into a fluid such as cooling water or a specific gas such as CF filling a container, placing a fuel assembly to be inspected to a predetermined portion the container, measuring a distribution of the fluid distributed in the fuel assembly by utilizing a nuclear magnetic resonance imaging system, and measuring the gap in accordance with the fluid distribution as an image. The measuring device includes a magnet unit and a coil unit for generating magnetic fields, and the coil unit includes a coil assembly for generating gradient magnetic fields and a coil assembly for generating a high-frequency magnetic field and detecting a nuclear magnetic resonance signal. The gap measuring apparatus utilizing nuclear magnetic resonance further includes a controlling device for controlling the magnetic fields generated by the magnet unit and the coil assemblies and a data processor for carrying out data processing in response to a signal transmitted from the controlling device, wherein the distribution of the fluid in the fuel assembly is processed as a sectional image of the fuel assembly to thereby measure the gaps between adjoining fuel rods or between the fuel rod and the water rod.
    • 通过将测量装置设置成诸如冷却水或诸如CF的特定气体的流体填充容器来测量布置在燃料组件中的相邻燃料棒之间的间隙,将待检查的燃料组件放置在容器的预定部分上, 通过利用核磁共振成像系统测量分布在燃料组件中的流体的分布,并且根据作为图像的流体分布来测量间隙。 测量装置包括用于产生磁场的磁体单元和线圈单元,线圈单元包括用于产生梯度磁场的线圈组件和用于产生高频磁场并检测核磁共振信号的线圈组件。 利用核磁共振的间隙测量装置还包括用于控制由磁体单元和线圈组件产生的磁场的控制装置和用于响应于从控制装置发送的信号执行数据处理的数据处理器,其中分配 燃料组件中的流体被处理为燃料组件的截面图像,从而测量相邻燃料棒之间或燃料棒与水棒之间的间隙。