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「Guideline for Assessing Large Tsunami Countermeasures in Japanese Nuclear Power Plants」
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ICMST Tokyo 2012
1st International Conference on Maintenance Science and Technology, Tokyo 2012
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Academic Articles
Regular Paper (Invited) Vol.2 (2010/2011) p.200 - p.206
 

Future Bearing Inspection System using Portable Linac X-ray Source
 
Tomohiko YAMAMOTO1 and Mitsuru UESAKA2
 
1 Japan Atomic Energy Agency, 4002 Narita-chou, Oarai, Higashi-Ibaraki, Ibaraki, 311-1393 Japan
2 The University of Tokyo, 2-22 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1188 Japan
 
Abstract
We have developed an X-ray source using portable X-band (9.3-12 GHz) linear accelerator (linac) for bearing real-time inspection. This system can generate pulsed-X-ray, therefore if X-ray repetition rate synchronizes with bearing rotation rate, we can get still images without stopping rotation. We succeeded in static imaging of rotating equipment. We start to develop more advanced X-ray generators using portable linac and multi-beam klystron (MBK). The advanced systems use higher electron energy linac and MBK as more stable radio-frequency (RF) source. We used 950 keV linac and 250 kW magnetron for X-ray imaging. However oscillation is unstable because magnetron is self-excited oscillator. Moreover, its temperature and rotation influence its output RF (Radio-Frequency) power, electron beam current and X-ray intensity. For the purpose of more stable operation and compactness of the system, we propose a multi-beam klystron (MBK) as its RF power source. In this paper, we show the basic parameters of the system which stability is tolerable for bearing condition based maintenance (CBM) in near future.
 
Keywords
Condition Based Maintenance (CBM), X-ray Source, X-band, Linac, Multi-Beam Klystron (MBK)
 
Full Paper: PDF EJAM Vol.2 pp.200-### "Future Bearing Inspection System using Portable Linac X-ray Source"
Article Information
Article history:
Received 31 January 2011
Accepted 25 February 2011