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Oct. 23 - 26, 2018
Sendai, Japan
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Nov 1 - 4, 2016
Shenzhen, China
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Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)

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OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
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Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

(in English)

Vol.1 No.3 NT13 (Nov., 2009) SheetB
Core shroud crack Removing Method by Grinding EJAM (1-3-NT13)SheetB - Core shroud crack Removing Method by Grinding
Hitachi-GE Nuclear Energy, Ltd.

Grinding is one of repairing methods in case of finding cracks at inner surface of core shroud. As shown in Fig.2, cracks are mechanically removed by grinding head mounted on access equipments. A view of area machined by grinding is shown in Fig.3. The characteristic of grinding is that machined surface is compressed (approx.400MPa) by underwater machining.


Fig.1 Grinding equipment for inner surface of core shroud


Fig.2 Situation of grinding mockup test

Japan Society of Maintenology (