BWR owners and plant fabricators have been making efforts to decrease the ISI parts where UT is difficult to be conducted. For that purpose, UT verification test for both detection and sizing qualification through deposit of pipe weld joint started in 2009 and will last until 2011. In 2009, UT verification test for stainless steel pipe weld joint has been performed. Test samples are stainless steel pipes with welds and sizes are 600A.350A.150A with EDM notches and/or SCC cracks. Angle beam methods and...
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Result of UT verification test for Stainless Steel through weld deposit

BWR owners and plant fabricators have been making efforts to decrease the ISI parts where UT is difficult to be cond ucted. For that purpose, UT verification test for both detection and sizing qualification through deposit of pipe wel d joint started in 2009 and will last until 2011. In 2009, UT verification test for stainless steel pipe weld joint has been performed. Test samples are stainless steel pipes with welds and sizes are 600A.350A.150A with EDM notches a nd/or SCCs. Angle beam methods and phased...
英字タイトル:
Result of UT verification test for Stainless Steel through weld deposit

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...
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Vibration diagnosis for bearing creep phenomenon of horizontal shaft type ventilation fan in Rokkasho reprocessing plant.

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 ...
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Early damage mechanism and vibration diagnosis for ball bearing of electric motor caused by unsuitable function of wave washer.