Fundamental studies on quantum beam-induced reaction processes under extreme conditions for establishing LWR water chemistry

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02667
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 31010:Nuclear engineering-related
• Research Institution: Osaka University
• Principal Investigator: Muroya Yusa 大阪大学, 産業科学研究所, 准教授 (40334320)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 高温高圧 / 放射線分解 / 量子ビーム / ピコ秒時間分解分光 / 反応動力学計算

Outline of Final Research Achievements

In reactor core of nuclear water-cooled reactors, cooling water is exposed to strong radiation, and is decomposed to produce oxidative products which will initiate undesirable effects on the structural materials such as SCC and transportation of radioactivity. Therefore, it is indispensably important to understand and control the chemical environment for long-term sustainability. Since direct measurement of the core environment is difficult, assessment based on abundant fundamental knowledge are necessary. Although some radiation chemical studies have been carried out for pure or dilute solutions, those studies have not been investigated yet under severe conditions (such as high temperature, high pressure, containing concentrated solutes). In this study, the reaction mechanism under such conditions was elucidated by using quantum beams.

Free Research Field

放射線化学

Academic Significance and Societal Importance of the Research Achievements

量子ビーム照射による物質の改質やその反応メカニズムを把握することは、原子力プラントを長期にわたって健全に保つための技術を根本から支えるものである。また得られた知見は、原子力分野に留まらず、量子ビームを活用する様々な産業（ナノリソグラフィー工学や放射線医学など）にも波及するものであり学術的にも高い価値を有する。