Development of maintenance technology for rotating equipment; Condition based maintenance by shock pulse method

Takeuchi, Kenji; Sanyoshi, Hirotaka; Fukuari, Yoshihiro; Inami, Shinichi

Proceedings of 7th International Conference on NDE in relation to Structural Integrity for Nuclear and Pressurized Components (CD-ROM), p.37 - 44, 2010/00

In the Tokai Reprocessing Plant (TRP), lots of blowers are used for enclosing radioactive materials in a controlled area, and pumps are used for circulating cooling water to keep temperature under appropriate conditions of vessels, which contain high-level radioactive liquid waste. These rotating equipments play an important role in safety management of the nuclear facilities, where they are required stable conditions all the time. To improve the reliability of rotating equipments, the condition based maintenance for detecting the deterioration is one of the effective measures. According to the analyses of the past maintenance data obtained in TRP, it has been found that about 90% troubles related to the rotating equipment are caused in the bearing works, in which the lubrication was defective in almost every case. So, it is very important for stable operation of the rotating equipment to monitor the lubrication conditions in bearings. The vibration method facilitates to detect defects and abrasion of bearings by measuring a vibration signal. However, this method has a disadvantage that quantitative management for the lubrication conditions of bearings is not possible. Therefore, the shock pulse method, which is widely used for diagnosis of the bearings, is applied to assess the deterioration of rolling bearing. The shock pulse method can detect the change of the lubrication condition and the presence of defects in bearings, by a pressure wave generated from rotating rolling bearing. The method can also evaluate the oil slick thickness and the condition of deterioration in the bearing. As one of maintenance activities performed after monitoring, replenishment with a suitable amount of oil for a lubricant was able to be conducted with a proper timing. As a result, the number of the troubles on bearings has significantly reduced because proper maintenance for keeping the oil slick thickness can be carried out, which resulted in stable operation of the rotary equipmen

None

Nemoto, Shinichi; Sakai, Toshiyuki*; Sanyoshi, Hirotaka; Kikuchi, Kenji; Iwasaki, Isao*; Kuribayashi, Masakazu*; Matsushima, Kazumi*

PNC TN8410 93-283, 86 Pages, 1993/11

PNC-TN8410-93-283.pdf:2.38MB

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None

Sanyoshi, Hirotaka; Sakai, Toshiyuki*; Kikuchi, Kenji; ; ;

PNC TN8410 93-080, 53 Pages, 1993/03

PNC-TN8410-93-080.pdf:3.86MB

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FBR fuels reprocessing experiments at CPF(13)

Ouchi, Jin; Sanyoshi, Hirotaka*; ; Kishimoto, Yoichiro; Kawata, Tomio*; ; *; *

PNC TN8410 87-011, 253 Pages, 1987/01

PNC-TN8410-87-011.pdf:5.38MB

None

FBR fuels reprocessing experiments at CPF(10)

; Ouchi, Jin; *; Idemitsu, Kazuya*; Sanyoshi, Hirotaka*; *; *; *

PNC TN845 85-08, 164 Pages, 1985/07

PNC-TN845-85-08.pdf:4.3MB

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FBR fuel reprocessing experiments at CPF(7)

; Ouchi, Jin; *; *; *; Idemitsu, Kazuya*; Sanyoshi, Hirotaka*; *

PNC TN845 84-07, 116 Pages, 1984/09

PNC-TN845-84-07.pdf:4.12MB

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*; ; Ouchi, Jin; *; *; Idemitsu, Kazuya*; Sanyoshi, Hirotaka*

PNC TN841 84-25, 185 Pages, 1984/04

PNC-TN841-84-25.pdf:4.71MB

no abstracts in English

None

*; *; *; *; *; *; *; Sanyoshi, Hirotaka*

PNC TN841 83-29, 112 Pages, 1983/05

PNC-TN841-83-29.pdf:2.44MB

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Optimization of the exchange period of high efficiency particulate air filter in Tokai Reprocessing Plant

Kawasumi, Hiroyuki; Sanyoshi, Hirotaka; Yatogi, Hideo; Fukuari, Yoshihiro; Inami, Shinichi

no journal, , 

In the ventilation facilities of the Tokai reprocessing plant, particle filters are generally installed both in air-intake and exhaust systems. In the air-intake system, atmospheric dust is filtered and the cleaned air is supplied into radiation controlled areas, whereas in the exhaust system, radioactive materials are filtered and discharge it to the environment. Because the filter of the exhaust system serves to prevent radiological release to the environment, a high-efficiency particle air (HEPA) filter that a decontamination factor is extremely high, is used for filtering radioactive particles. The HEPA filter is usually exchanged with new one when the filter is carried over with particles, or it is exchanged by the limit as an anti-aging deterioration measure in time. This report reviews the exchange period of a periodical filter by confirming the integrity of a filter installed in investigation and the enforcement of the past filter exchange results and reports the result that planned adequacy.

Maintenance for ventilation system of The Tokai Reprocessing Plant

Kawasumi, Hiroyuki; Takeuchi, Kenji; Domura, Kazuyuki; Sanyoshi, Hirotaka; Inami, Shinichi

no journal, , 

The Tokai Reprocessing Plant has recovered nuclear materials from spent nuclear fuel. Reprocessing process is consisted of shearing process, a dissolution process and an extraction process etc. Each facilities designed to confine radioactive materials in controlled area to keep negative pressure using ventilation system. This system has been used over 40 years. We analyzed influences to the trouble of aging equipment, and we considered necessary additional check out system to prevent troubles based on the results of analysis. This reports describe the present status of this system.