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1. 发明授权

US4818471A BWR fuel assembly channel with localized neutron absorber strips for LPRM calibration 失效
标题翻译： BWR燃料组装通道，具有用于LPRM校准的局部中子吸收条
公开(公告)号：US4818471A
公开(公告)日：1989-04-04
申请号：US83402
申请日：1987-08-10
申请人： Ronald M. Thomson , Rusi P. Taleyarkhan
发明人： Ronald M. Thomson , Rusi P. Taleyarkhan
IPC分类号： G21C3/30 , G21C3/334 , G21C17/00 , G21C17/10
CPC分类号： G21C17/10
摘要： A Local Power Range Monitor (LPRM) string is employed between BWR fuel assemblies arranged in side-by-side spaced positions. The string has a hollow tube and neutron detectors located therein at spaced axial locations and being adapted to provide local power monitoring information. The hollow string tube is adapted to receive a neutron flux sensitive probe for calibrating the detectors. Each fuel assembly has an outer hollow tubular channel surrounding fuel rods and spacers disposed within and axially along the channel and about the fuel rods. The spacers are composed of a material incapable of producing a localized change in neutron flux. Elements in the form of strips of a neutron absorber material are attached to the exterior of the channel of each fuel assembly at a respective corner thereon and located axially at different known positions therealong and adjacent to the hollow string tube. The material composing the strips is capable of producing a localized change in neutron flux such that, upon passage of the probe through the hollow string tube and past the strips, the probe will sense the neutron flux change being produced by each of the strips and thereby the position of the probe can be tracked as it is moved through the string tube.
摘要翻译：在并排布置的BWR燃料组件之间采用局部功率范围监视器（LPRM）。弦具有中空管和位于其间隔开的轴向位置的中子探测器，并适于提供局部功率监测信息。中空弦管适于接收用于校准检测器的中子通量敏感探针。每个燃料组件具有外部中空管状通道，其围绕设置在通道内并且沿着通道并且围绕燃料棒设置的燃料棒和间隔件。间隔物由不能产生中子通量局部变化的材料组成。中子吸收材料条带形式的元件在每个燃料组件的通道的外部在其相应的角落处附接并且轴向位于沿着中空弦管的不同的已知位置处。构成条的材料能够产生中子通量的局部变化，使得当探针通过中空管管并经过条时，探针将感测由每个条产生的中子通量变化，从而探头的位置可以随着其通过弦管移动而被跟踪。

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