This study is examination of the quantitive valuation method of maintenance activities of a nuclear powe r plant. Therefore, the concept of the maintenance equation that examination was advanced in the Japan S ociety of Maintenology or the Japan Society of Mechanical Engineers (JSME) was arranged. Basic examinati on for a maintenance equation to formulize the above-mentioned examination to reference was carried out....
英字タイトル:
Study on the quantitive analysis approach for maintenance

This report describes the effectiveness of the application of acoustic diagnosis using vibration data for nspecting rotating machines. We usually apply the vibration diagnosis for the inspection of rotating machines on CBM(Condition Based Maintenance). However, with the vibration diagnosis, sometimes we annot discover the cause of abnormal sounds fro m rotating machines. Therefore, we tried another iagnosis. We converted the vibration data to the acoustic data and then inspected the abnormal sounds. We se...
英字タイトル:
Application of Acoustic diagnosis for rotating machines

The ductile-brittle transition behavior of neutron-irradiated welded A533B Cl.1 steel has been studied by means of small specimen test technique for discussing the specime n size effects on the impact properties. Standard size, one-third size and 1.5mm size Charpy V-notch specimens were prepared. Neutron irradiation was performed in JMTR wit h fluencies up to 0.75 and 1.3 X 1024 n/m°(E>1 MeV). Normalization of the USE is done by a curve fitting method and the USE of different size of specimens can be expre...
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Evaluation Technique of Neutron-Irradiation Embrittlement in Welded RPV

This paper describes effectiveness of applying acoustic diagnosis to the greasing work. When we hear abnormal sounds from grease lubricated bearings, we try greasing. As a result, usually abnorm al sounds fade away. But after a while sometimes the sounds appear again. Therefore we try greasing again. The sounds fade away at the time but later appear again. We try greasing again and agai n but the results are the same. By this time, the temperature of the bearing has increased a lot. If the temperature incr...
英字タイトル:
Acoustic diagnosis improves maintenance of grease lubricated bearings

This paper describes study of effectiveness of applying acoustic diagnosis to CBM(Condition Based Maintenance). We usually measure data of vibration of rotating machines with accelerometer to monitor the condition of it. This work is dangerous because we put the accelerometer near the rotating shaft of the machines by hand. Therefore we tried the non-contact sensing using a microphone of acoustic diagnosis and checked the data. As a result, we got the enou gh data for the monitoring safely.When rotating ma...
英字タイトル:
Acoustic diagnosis Improves work safety and reliability of CBM