Management and maintenance tools are now greatly available for contributing reduction of maintenance cost and time. These tools surely give us much benefit, but are only for maintaining reliabilities of the equipment. Reliability of the plant depends on the design and actual operating conditions. Accordingly, the matter to do first is to consider facilities in the range of the plant life cycle. This brings the result that "process property" and "functional property" are required besides "equipment pro...
英字タイトル:
Application of Plant Technology Knowledge Infrastructure to Plant Engineering and Maintenance

We have explained the importance of the application of Technology Knowledge Infrastructure for effective plant main tenance. Persons concerned focus on its easiness to handle and cost to introduce. On the actual application, some d ifficulties come out such as data registration, utilizing of technological knowledge. This paper tries to solve thes e problems for advanced maintenance system characterized in the attainment of reliability of equipment in low cost....
英字タイトル:
Application of Technology Knowledge Infrastructure to Plant Maintenance

This paper describes the result of demonstration test using WesDyne International's inspection system in terms of its sizing capability of crack from the inner diameter (ID) of PWR RV head penetrations, detectability of the crack e mbedded under repair welding, which was applied for isolation from the primary water environment, and the propagation of ultrasonic wave from the ID penetration to the inside of J-weld. The result of the laboratory tests have demon strated the sizing capabilities of both ultraso...
英字タイトル:
Sizing Capabilities of Crack for the Inspection of PWR RV Head Penetrations

This paper describes a collaborative study on degradation and damage of structural materials and the detection and evaluation methods of degradation and damage in structural components in the course o f the activities of the research committee on the Detection and Evaluation Methods of Degradation and Damage in Structural Materials. The research committee has been established in the Japan Society o f Maintenology since April, 2004 and has attempted to clarify the damage and/or degradation mechanisms caused...
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Degradation and Damage of Structural Materials: Methods of Evaluation andPossibility of Their Applications to the Condition-Based Maintenance

This paper describes shot peening treatment of modified 9Cr steel and 316FR austenitic stainless steel, candidate structural materials for FBR by using YAG laser. A laser peening system has been developed and used to provide laser peening treatment for plate s pecimens of the two types of the steels dipped in water. A high speed digital camera revealed that many small bubbles were initiated along the path of laser light, moved along the path and coalesced with one another to produce a few large bubbles. Th...
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Laser Peening Treatment of modified 9Cr and 316FR Steels

Modified 9Cr-Mo steel is a candidate structural steel for demonstration fast breeder reactors (FBR's). Due to low thermal activation, the steel can maintain steady-state deformation during long-term creep. The creep strength of its weldment is lower than that of the base metal. Because of different creep strain rate in the solidified weld metal and heat-affected zone (HAZ), creep deformation in HAZ can be lowered but maximum principal stress augmented in fine-grained HAZ to cause detrimental Type IV cra ck...
英字タイトル:
FEM Analyses of Creep in Welded Modfied 9Cr Steel Considering Microstructures in Weld and HAZ

Creep-fatigue (Creep fatigue and fatigue) tests of Mod. 9Cr-1Mo steel have been performed by varying stress holding time at 550℃. Creep-fatigue properties are affected by stress holding, and strain rate increases with increasing stress holding time．In Vickers hardness measurements Vickers hardness of creep fatigue damaged specimen is larger than that of fatigue damaged specimen. In magnetic characterization the saturated magnetic flux density and permeability of creep fatigue damaged specimens are larg...
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Creep-fatigue evaluation and damage characterization for structural materials of advanced fast breeder reactor

The technique of obtaining shape of inclined defect at heat affected zon e for welded specimen of high chromium steel was proposed. In this techn ique, magnetic flux leakage measurement and the inverse analysis using s ingular value decomposition were used. Suitable defect shape was obtained from the magnetic flux density distribution under the high magnetic fiel d without being subject to the influence of a welding part. Under the lo w magnetic field, suitable defect shape was obtained by subtracting the ...
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Proposal of electromagnetic inverse analysis technique about the inclineddefect for welded specimen of high chromium steel