論文の公開元へ Advanced Energy Structural Materials Research Section
概要
1. Introduction
In order to achieve the safety and efficient operations of advanced nuclear energy systems, the development and use of robust materials and the establishment of reliable system maintenance management are essential. This section addresses the mission of establishing the maintenance management methodology as well as material R & D for advanced nuclear energy systems such as fusion and fission reactors. Current main researches are as follows:
(1) Materials modeling and data-driven science & technology
Radiation damage processes in nuclear materials occur at a wide variety of time and length scales. To understand this process, so-called multiscale view point and statistical arguments are required. In this section, efforts are made to model material behavior during irradiation complementarity using several computational techniques such as molecular dynamics, ab-initio quantum calculations, kinetic Monte-Carlo, rate-equation theory analysis, FEM and CFD. Recently, additional efforts have also been devoted to this research using machine learning, Al (artificial intelligence) and data-driven techniques.
(2) Plant integrity analysis
The structural integrity of the reactor pressure vessel (RPV) is critical to the reactor safety. Here, this is evaluated using three-dimensional computational fluid dynamics (3D-CFD) and the finite element method (FEM). Pressurized thermal shock (PTS) events during emergency water cooling, the most severe situation, are focused in this study. Through this evaluation, the risk of the RPV function loss is quantified and it is proposed as an indicator available for optimizing maintenance strategy.
(3) Effects of irradiation on the microstructure and mechanical property changes of materials
High energy particle irradiation leads to the formation of oversaturated interstitials and vacancies. The behavior of point defects is responsible for the evolution of the microstructure, which may cause degradation, (or development), of the mechanical properties of the material. The elucidation of the behavior of point defects is essential for understanding the mechanisms responsible for the changes in mechanical properties. In our study, the microstructure evolution under high energy particle irradiation has been investigated experimentally and computationally.
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