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Vol.7 No.2previous AASP15 (106-107-108-109-110-111)- AA112-113 NT71

Academic Articles
Regular Paper Vol.7 No.2 (2015) p.160 - p.165
 

Numerical Evaluation of Material’s Degradation under Various Irradiation Conditions

 
Toshiki NAKASUJI1, Yasunori YAMAMOTO1, Kazunori MORISHITA2
 

1 Graduate School of Energy Science, Kyoto University, Kyoto 611-0011, Japan
2 Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan

 
Abstract

Structural materials during a use in a fission reactor are subjected to irradiation by high energy neutrons, and therefore the properties, functions, and performances of materials become gradually degraded. Since keeping material’s integrity is a key to success towards a stable operation of reactors, materials degradation due to irradiation should be taken into account when reactor design and maintenance are considered. One of the issues to be solved for realization of a long term operation is how the integrity of materials in use is ensured for a long time beyond an actually-experienced operation period. To do this, the future ageing behavior of materials should be understood in advance. Usually, an attempt is made to understand the behavior using the existing irradiation facilities with accelerated irradiation environments. In many cases, however, material’s behavior depends much on acceleration coefficients and its dependency is not so simple. To overcome such a difficulty, a numerical simulation study is employed. In the present study, reaction rate analysis is performed to investigate material microstructure changes under various irradiation conditions. Our results have shown that volume swelling due to irradiation is very much different depending on irradiation conditions provided by such irradiation facilities as HFIR, JOYO, KUR, 14MeV fusion neutrons. Based on the results, irradiation correlation methodology is discussed to predict material’s degradation under arbitrary irradiation conditions using the actual existing data obtained with accelerated irradiation conditions.

 
Keywords
Radiation damage, Rate theory, Defect cluster, Neutron spectrum, Irradiation correlation
 
Full Paper: PDF EJAM Vol.7No.2 pp.160-165 "Numerical Evaluation of Material’s Degradation under Various Irradiation Conditions"
Article Information
Article history:
Received 5 December 2014
Accepted 4 June 2015