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21. 发明专利

JPH05297180A 失效
公开(公告)号：JPH05297180A
公开(公告)日：1993-11-12
申请号：JP9927592
申请日：1992-04-20
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： TAKEUCHI TSUTOMU , KAWAMOTO KIKUO
IPC分类号： G21C17/00
摘要： PURPOSE:To allow a reliable measurement in a reactor containment, a higher intelligence for light output, possession of self-diagnostic function, and judgment of quality of signal by conducting the transmission and detection of signals in the container by use of an optical cable and a light outputting measuring instrument. CONSTITUTION:A number of equipments necessary for vapor generation are received in a container 8, and a number of signals are present therein. For example, a recirculating pump motor 11 has a vibrometer 5 and a winding thermometer 2, and a pressure vessel 7 has a number of thermometers 2. A release valve 13 also has a limit switch 6, a valve has the thermometer 2, and a drain sump 12 has a level instrument 4, and the atmospheric temperature is measured by the thermometer 2. In this way, many equipments and signals are present, these are detected by light, and the signals are transmitted to a monitor plate 9 to give an instruction or alarm, whereby the stable operation of a plant is assisted. Considering the ensuring of the space for the transmission of many signals and a reduction in cost, many optical couplers 14 are used to conduct the time-divided signal transmission, whereby the signal processing according to a requirement can be performed.

22. 发明专利

JPH05296812A 失效
公开(公告)号：JPH05296812A
公开(公告)日：1993-11-12
申请号：JP9950792
申请日：1992-04-20
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： TAKEUCHI TSUTOMU , KAWAMOTO KIKUO
IPC分类号： G01F23/22 , G01K11/12
摘要： PURPOSE:To provide an optical-cable liquid-level gauge wherein its structure is simple, its water-level detection accuracy is high and its maintenance and inspection on the side of a liquid contact part are not required. CONSTITUTION:An optical fiber 1 is attached to the inside of a warm-water tank 2 in such a way that the other end of it is used as an open end. An optical pulse which is incident on the optical fiber 1 from a water-level detection apparatus 5 is scattered due to the lattice vibration of glass atoms in various parts of the optical fiber; beams of scattered light according to temperatures of the parts are reflected to the side of the water-level detection apparatus 5. Beams of reflected light are provided with wavelength components which are dependent on the temperatures. As a result, when the beams of reflected light are analyzed, the temperature distribution in the length direction of the optical fiber 1 can be found out. At a liquid level, the temperature of a part in a liquid is different from that in an air-layer part on it. As a result, when a temperature change point is detected, the position of the liquid level can be detected.

23. 发明专利

JPH02208597A OVERALL PREVENTIVE MAINTENANCE SYSTEM FOR PLANT 失效
公开(公告)号：JPH02208597A
公开(公告)日：1990-08-20
申请号：JP2946389
申请日：1989-02-08
申请人： HITACHI LTD
发明人： SATO TAKAO , TAKEUCHI TSUTOMU
IPC分类号： G21C17/00 , G01M99/00
摘要： PURPOSE:To keep the operating efficiency of a plant high and to decide its optimized maintenance precedence by estimating a residual service life of each equipment or device of the plant and by providing a device for judging its effect occurring at the end of its service life and its maintenance precedence. CONSTITUTION:Based upon a predetermined rule, equipments and devices which are subjected to a diagonosis are selected; their operational and environmental condition data and so on are taken in from a data base DB 5; their residual service life after that time is diagonosed based upon a predetermined residual service life algorithm in a residual service life diagonosis means 1. It is judged which component part or element reaches the end of its service life earliest, its failure modes are judged 2 based upon results of the previous judgement, and when a failure occurs, its influence on a whole plant is judged with data of the database 5. On the other hand, based upon another predetermined rule, maintenance precedence is decided and output. The above-mentioned process is applied to all the equipments and devices according to a schedule. In this way, a foundamental maintenance of the equipments and devices can be executed in advance to ends of their service lives, so that the operating efficiency of the plant can be kept at an economically high level.

24. 发明专利

JPS58118196A EARTHQUAKE RESISTANT RACK HOUSING 失效
公开(公告)号：JPS58118196A
公开(公告)日：1983-07-14
申请号：JP26782
申请日：1982-01-06
申请人： HITACHI LTD
发明人： TAKEUCHI TSUTOMU
IPC分类号： G21C17/00 , H05K7/18

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