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.13 No.1previousAA175-AA176
Academic Articles
Regular Paper Vol.13 No.1 (2021) p.1 - p.11
 

Tempering Effect Prediction of Temper Bead Repair Technology for BMI Penetration Nozzles

 

Lina YU1 , Kazuyoshi SAIDA1 , Kazutoshi NISHIMOTO1 and Naoki CHIGUSA2

 
1Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2The Kansai Electric Power Co., Inc., 8 Yokota, 13 Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
 
Abstract
The aged reactor vessel bottom mounted instrument (BMI) penetration nozzles of nuclear power plant needs to be repaired or maintained. Temper bead welding is one effective repair welding methods instead of post weld heat treatment. For temper bead welding, hardness and toughness are the key criteria to evaluate the tempering effect. A neural network-based method for hardness and toughness prediction in heat affected zone of low-alloy steel has been constructed to evaluate the tempering effect in temper bead welding by the authors. For the BMI penetration nozzle with different mounting angles (0°, 15°, 30°and 45°), the hardness and toughness distribution in heat affected zone of temper bead welding in the cross sections of BMI penetration nozzle was predicted based on the thermal cycles numerically obtained by Finite Element Method (FEM). Through this method, the tempering effect of the temper bead repair technology can be predicted before the actual repair welding, thus the appropriate welding conditions would be able to optimize before the actual repair welding, which was very useful for the repair welding for BMI penetration nozzles of nuclear power plant.
 
Keywords
BMI, Hardness, Toughness, Temper bead welding, low-alloy steel, FEM
 
Full Paper: PDF
Article Information
Article history:
Received 23 October 2020
Accepted 1 May 2021