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公开(公告)号：US11081244B2
公开(公告)日：2021-08-03
申请号：US15736040
申请日：2015-09-08
发明人： Toshihide Aiba , Atsushi Saito
IPC分类号： G21C17/108 , G01T3/00 , G21C17/10 , H03G1/00 , G21D3/00 , H04B14/04 , H03G3/00 , H04B1/04 , G01T1/17
摘要： In an encore nuclear instrumentation system which is equipped with a movable type neutron detector, an object of the invention is to control measurement errors due to the degradation of the system. The incore nuclear instrumentation system includes a neutron detector which is to be installed in a nuclear reactor stored in a containment vessel, and an instrumentation unit which has a current detector circuit and is to be installed on the outside of the containment vessel. An output signal of the neutron detector is inputted into the current detector circuit, and the instrumentation unit remembers a matrix which shows a relation among a reactor power of the nuclear reactor, a gain of the current detector circuit, and an output voltage Vn of the current detector circuit, and the calibration of the current detector circuit is performed with reference to the matrix.
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公开(公告)号：US11069452B2
公开(公告)日：2021-07-20
申请号：US16475869
申请日：2017-02-23
发明人： Atsushi Saito , Kazunori Aida
IPC分类号： G21C19/20 , G21C17/108 , F16P3/08 , G21C17/10 , G21C13/02
摘要： A drive device for an in-core neutron instrumentation system includes a safety circuit between a power supply and a drive motor. The safety circuit is provided inside the cover member, and switches between a conductive state in which power can be supplied to the drive motor and a cut-off state in which power cannot be supplied thereto depending on a mounted state of the cover member. The safety circuit is controlled to be in the conductive state in response to a state in which the cover member is mounted on the base member, and is controlled to be in the cut-off state in response to a state in which the cover member is not mounted on the base member.
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公开(公告)号：US20190267145A1
公开(公告)日：2019-08-29
申请号：US16334479
申请日：2016-11-22
发明人： Atsushi Saito , Toshihide Aiba
IPC分类号： G21C17/108 , G01T3/00
摘要： Non-contact sensors are used as a pull-out limit switch and a safety limit switch, so that contact between a drive cable and a thimble tube and both limit switches is avoided and abrasion of both limit switches is eliminated. In addition, erroneous detection due to vibration of the thimble tube is prevented by eliminating contact between the thimble tube and both limit switches, whereby accuracy of passing of a detector is enhanced.
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