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Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
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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

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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.

EJAM1-3-NT13(sheetB)-Fig.1_Grinding_equipment_for_inner_surface_of_core_shroud

Fig.1 Grinding equipment for inner surface of core shroud

EJAM1-3-NT13(sheetB)-Fig.2_Situation_of_grinding_mockup_test

Fig.2 Situation of grinding mockup test

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Japan Society of Maintenology (ejam@jsm.or.jp)