The equipment diagnosis of Rokkasho reprocessing plant,was started from 2004 completion of the chemica l test.Target apparatus is rotation machine,such as a pump and a blower.The number is about 1700 sets. The pursuer has the qualification of ISO18436-2 and ISO18436-4. Moreover, it is working based on JEAG4221-2007. On the business of our company, the rotation machine is diagnosed using oscillating diagnosis and lubricating oil diagnosis. This report, the diagnosis method of a rotation machine and the Vibr...
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Condition monitoring and diagnostics for rotation equipments in the Rokkasho reprocessing plant. Equipment diagnosis by using the oscillating diagnosis.

A lot of horizontal shaft type ventilation fan systems were installed and have been continuously operated in the Rokkasho reprocessing plant. The maintenance method by TBM (Time Based Maintenance) and periodical vibration diagnosis has been applied for the stable operation to keep containment function of the facilities. Although creep phenomenon of bearings in a fan and a motor is one of the important factors to evaluate its integrity, it is not easy to recognize the creep earlier from the monitor dat...
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Vibration Diagnosis for Bearing Creep Phenomenon of Horizontal Shaft Type Ventilation Fan in Rokkasho Reprocessing Plant

Many number of horizontal shaft type ventilation fan system were installed and have been continuously operated in the Rokkasho reprocessing plant. The maintenance method by TBM(Time Based Maintenance) and periodical vibration diagnosis has been applied for the stable operation to keep containment function of the facilities. Although a bearing creep phenomenon of fan and motor is one of the important factors to evaluate the integrity, it has been said that it was not easy to recognize early from the mon...
英字タイトル:
Vibration diagnosis for bearing creep phenomenon of horizontal shaft type ventilation fan in Rokkasho reprocessing plant.

Vibration monitoring & diagnosis skill is required to maintain the soundness of rotating equipments installed in large plants such as nuclear facilities. It is effective to bring up this skill with many number of experience of real incidents in actual plants, but abnormal phenomena occur randomly, so it takes a long time to learn from actual plants, and to increase human resources with excellent monitoring & diagnosis skill. To solve this subject, we developed the special unit (J-RAV) which simulated a few ...
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Activities to improve monitoring & diagnosis skill with abnormal vibration simulation unit for rotating equipments (J-RAV)

Vibration diagnosis of rotating equipment is important in nuclear power and other industrial plants. J-tech has diagnosed the vibration of rotating equipment in Rokkasho Reprocessing Plant since 2004. We have experienced various diagnosis cases in accordance with various kind of specification of the rotating equipment. Training for engineers of vibration diagnosis is to be valuable by diagnosing actual in-service equipment. However, as abnormal vibration occurs unexpectedly, it is difficult to experience it...
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Development and Utilization plan of the training equipment for abnormal vibration

Maintenance methods are broadly grouped to the preventive maintenance(Time Based Maintenance) and the post incident maintenance(Condition-Based-Maintenance,Breakdown-Maintenance). It is unusually confirmed after maintenance that an unsuitable disassembling of rotating equipment causes incident such as increasing of vibration or abnormal sound. At the case of maintenance of electrical motors that are used for mid or small sized pumps or blowers, and wave-washer is reused, a few times of these phenomena ...
英字タイトル:
Early damage mechanism and vibration diagnosis for ball bearing of electric motor caused by unsuitable function of wave washer.