Search

Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
< All Occasional Topics

Information
ICMST-Kobe 2014
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)
Issues
  Vol.5 No.4(Feb-25)
Vol.5 No.3(Nov-25)
Vol.5 No.2(Aug-26)
Vol.5 No.1(May-27)
< Other Issues

Featured Articles
EJAM5-3NT58 "Development of Future Prediction of Animation by coupling of Principle Component Analysis and Singular Spectrum Analysis"
EJAM5-3NT58 Validation of Multifrequency and Window-Multifrequency Techniques using Remote Field Eddy Currents for ISI of FBR Tubes
EJAM5-3NT59 Remote Controlled Robot with expandable features

JSM
Contacts
(EJAM): ejam@jsm.or.jp
(JSM): secretariat@jsm.or.jp
HP: http://www.jsm.or.jp
(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.

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

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