Study on Improvement in Reliability of Inventory Assessment in Vitrified Waste for Long-Term Safety of Geological Disposal
| Autor: | Katsuhiko Ishiguro, Kazumi Kitayama, Hiroyoshi Ueda, Satoru Kaneko, Nobuo Shinohara, Keiichiro Wakasugi, Noriyasu Moriya, Masamichi Chino, Keisuke Okumura, Masumi Ishikawa |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Transactions of the Atomic Energy Society of Japan. 8:304-312 |
| ISSN: | 2186-2931 1347-2879 |
| Popis: | Since quality control issues for vitrified waste are defined mainly with the focus on the transport and interim storage of the waste rather than the long-term safety of geological disposal, they do not cover inventories of long-lived nuclides that are of most interest in the safety assessment of geological disposal. Therefore, we suggest a flow chart for the assessment of inventories of long-lived nuclides in the vitrified waste focusing on the measured values. This includes an indirect assessment with indicative nuclides that have been already measured in the returned vitrified wastes from abroad. In order to apply this flow chart for commercial operation, its applicability should be examined for cases with a variation in burn-up history and with an uncertainty associated with carry-over fraction at reprocessing. We started an R & D program to examine the applicability as well as to improve the reliability of the nuclide generation/decay code and the nuclear data library using liquid waste from spent fuel with a clear irradiation history. To solve the issue of quality control for vitrified waste, a comprehensive study is needed in aspects not only of geological disposal field but also of operation of a nuclear power plant, reprocessing of spent fuel and vitrification of liquid waste. This study is a pioneering study conducted to integrate them. |
| Databáze: | OpenAIRE |
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