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1. 发明专利

JPH09304536A OPTICAL FIBER TEMPERATURE AND RADIATION MEASURING INSTRUMENT 失效
公开(公告)号：JPH09304536A
公开(公告)日：1997-11-28
申请号：JP12166596
申请日：1996-05-16
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： FUJII TATSU , YUMITATE TADAHIRO , TAMURA SEIICHI
IPC分类号： G01K11/12 , G01T1/00 , G02B6/00 , G21C17/02
摘要： PROBLEM TO BE SOLVED: To surely perform radiation and temperature measurement by finding the incident position and intensity of optical fiber radiation for radiation from the arrival time difference of discriminated scintillation light, and besides, finding a temperature position from the arrival time difference between Stokes light and antiStokes light. SOLUTION: Scintillation light 10 of one end side of a scintillation fiber 8 is input to a time difference measuring circuit 17 through a connector 9a, an optical fiber 15a and the like, and on the other hand, the scintillation light 10 of the other end side is input to the circuit 17 through a connector 9b, an optical fiber 15b and the like. A signal processing circuit 14 finds the incident position and intensity of radiation 100 in the scintillation fiber 8 on the basis of a time difference. The circuit 14 measures temperature of the optical fibers 6a, 6b by the ratio of Stokes light 11a to anti-Stokes light 11b, and the pulse generation time of a pulse generator 1 and a measuring temperature position of the optical fibers 6a, 6b are specified on the basis of the time difference in which rear scattering light 70 reaches through light/electricity converters 13a, 13b.

2. 发明专利

JPH0972987A CORE FLOW-RATE MEASURING DEVICE 失效
公开(公告)号：JPH0972987A
公开(公告)日：1997-03-18
申请号：JP25460595
申请日：1995-09-06
申请人： HITACHI LTD
发明人： YUMITATE TADAHIRO , FUJII TATSU
IPC分类号： G01F1/34 , G21C17/032
摘要： PROBLEM TO BE SOLVED: To provide a core flow-rate measuring device for a reactor suitable for obtaining the core flow-rate which is high in responsibility and reliability over the entire operation region from low core flow-rate to rated core flow-rate. SOLUTION: Multiple channels (A-D) is provided with a core flow rate measuring means 17 utilizing the differential pressure between core bottom lattice boards, a core flow-rate measuring means 20 using the differential pressure before and after a recirculating pump in a reactor, a comparison means 19 where the differential pressure between core bottom lattice boards is compared with the preset value, and a means 21 where, when the differential pressure between core bottom lattice boards falls below the set value, the measurement value of core flow rate measuring means of the former is switched to that of the latter. Further, a signal selection means 28 where the core flow rate of each channel is selected for output is provided, and a core flow rate measuring means 20 performs calculation based on the mutual relation where the differential pressure signal before and after a recirculating pump in the reactor has a square law to the core flow rate.

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