We verified about the availability of the RCM method used successfully in the U.S., and the possibility of application to the Hamaoka nuclear power st ation. In Japan, the introduction of RCM method to domestic power plants has been examined, but the method has been too special for public to obtain t he acknowledgment and consensus. In this paper, we discussed our unique approach classifying the equipments from viewpoints of safety, operation and s ocial effect etc. The importance classification was done f...
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Approach to the maintenance program decision which took in the risk concept

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....
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Study on the quantitive analysis approach for maintenance

After 2002, Stress Corrosion Cracking (SCC) came to be detected in the low carbon stainless steel PLR Piping of BWR plants. However, it worked on the improvement of ultrasonic examination technology for PLR Piping in Japan BWR Owners Group (JBOG) , because the mistake of the evaluation was caused as a rare case. In this study, it introduces the improvement of ultrasonic testing technology and evaluation....
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Know-How for the Ultrasonic Examination Practice & Evaluation of PLR Piping

This report describes the applicability study result of the diagnostic te chnology by the electromagnetism to an internal rotation object. In order to perform further detailed study, measurement of the basic data of a pu mp and the preliminary experiment in an air drive turbine were conducted....
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Applicability study of the diagnostic technology by the electromagnetism to the rotating machines

The plant maintenance method mainly used in the domestic nuclear power plant is TBM (Time Based Maintenance), while RCM (Reliability c entered maintenance) with risk assessment methods have been successfully used in U.S. In this paper, we discuss our research on the app licability of the U.S. technique to the Feed-water system at Hamaoka Unit-3, which was performed in 2004FY. Since these methods were t hought to be applicable also to Hamaoka, we will work on the solution of the extracted problems for the f...
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Applicability examination of the Preventive Maintenance Optimization approach in Hamaoka nuclear power station

NPP Unit 1 and Unit 2 terminated operation on January 30th of 2009 and submitted an application for the decommiss ioning plan licensing on June 1st of 2009. At present due to the lack of clarity about requirements for maintenan ce at decommissioning stage such as Hamaoka NPP Unit 1 and Unit 2, we considered their maintenance optimization a nd planed maintenance management categorized three classifications in anticipation of the future decommissioning....
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Maintenance management of Hamaoka Nuclear Power Plants Unit 1 and Unit 2 terminated operation

This paper introduces the simply applicable vibration diagnostic technique to a vertical type pump in nuclear power pla nts. This technique is the combination of simple shaft vibration measurement by an ultrasonic vibrometer and a rotor dy namics simulation. By using this technique, for vertical type pump, a simple and high-precision diagnosis is attained. It is expected that this technique has effect in cost reduction and improvement of reliability in nuclear power plants....
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Vertical type pump diagnosis using an ultrasonic vibrometer