Search


Information
ICMST-Tohoku 2018
Oct. 23 - 26, 2018
Sendai, Japan
ICMST-Shenzhen 2016
Nov 1 - 4, 2016
Shenzhen, China
(EXIT THIS PAGE)
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.10 No.2(Aug)
Vol.10 No.1(May)
Vol.9 No.4(Feb)
Vol.9 No.3(Nov)
< Other Issues

 

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

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

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

 

Vol.12 No.1previousAA SP23 (AA172-173)-AA174 NT97
Academic Articles
Regular Paper Vol. 12 No. 1 (2020) p.7 - p.13
 

Application of Charpy Specimens Reconstituted by Electron Beam Welding for the Evaluation of Irradiation Embrittlement of Reactor Pressure Vessels
 

Seiji SAKURAYA1, Yasuo MORISHIMA2, Tetsuya TOYOTA3 and Takayuki KAMINAGA4

 
1Nippon Nuclear Fuel Development Co., Ltd., 2163 Narita-cho, Oarai-machi, Higashi-ibaraki-gun, Ibaraki-ken 311-1313, Japan
2Toshiba Energy Systems & Solutions Corporation, 8, Shinsugita-Cho, Isogo-Ku, Yokohama-shi, Kanagawa-ken 235-8523, Japan
3Hitachi-GE Nuclear Energy, Ltd,1-1, Saiwai-cho 3-chome, Hitachi-shi, Ibaraki-ken 317-0073, Japan
4Tokyo Electric Power Company Holdings, Inc., 2-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo, 100-0011, Japan
 
Abstract
According to the recent Japanese regulations regarding plant life extension of light water reactors for operation exceeding 40 years, additional surveillance tests are required for the evaluation of irradiation embrittlement of reactor pressure vessel materials. The number of loaded specimens in boiling water reactors is limited; accordingly, securing surveillance specimens is an important issue. Reconstitution of tested Charpy specimens is one way to secure the required number of specimens. Electron beam welding has the advantages of low heat input and realization of a highly reliable weldment property; therefore, it is a candidate for the specimen reconstitution method. In this study, applicability of reconstituted Charpy specimens was studied. Electron beam welding of irradiated surveillance specimens was carried out in the hot laboratory by remote manipulation. After the welding, specimens were processed into the shape of Charpy impact specimens, and Charpy impact tests were performed. The soundness of the welded joints was evaluated and the obtained results satisfied the requirements of the Japan Electric Association Code.
 
Keywords
Reconstitution, Reactor pressure vessel, Electron beam welding, Irradiation embrittlement, Low alloy steel
 
Full Paper: PDF
Article Information
Article history:
Received 23 October 2018
Accepted 11 April 2020