著者

山崎 正俊 宇根崎 博信

出版者

Atomic Energy Society of Japan

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.9, no.3, pp.243-251, 2010 (Released:2012-02-08)

参考文献数

8

被引用文献数

1 1

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For the sake of more efficient operation of nuclear power plants and to reduce the number of spent nuclear fuel assemblies, increasing uranium enrichment is one of the rational options. However, current uranium enrichment for the whole fuel cycle infrastructure is limited to no greater than 5 wt% from the view point of criticality safety. In this review, three main topics are discussed: 1) the necessity of increasing the uranium enrichment above 5 wt%; 2) current status and challenges to go over 5 wt% enrichment; and 3) proposal of the “Erbia Credit Super High Burnup Fuel” as a measure to break the “5 wt% enrichment barrier.” The third topic is further elaborated on by discussing the introduction scenarios before concluding with a mention of the necessity of a best-mix analysis for this concept in the fuel cycle supply chain.

著者

滑川 東 高木 直行 大岡 靖典 山崎 正俊

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.11, no.2, pp.118-126, 2012 (Released:2012-05-15)

参考文献数

14

被引用文献数

1 2

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In the development of the above 5% enrichment fuel, which is one of the targeted concepts of the next-generation LWR, a reduction in power generation cost is expected. However, the introduction of the above 5% enrichment fuel has several adverse effects on the cost, such as SWU increase, newly required measures for criticality prevention, and increases in gamma, neutron and heat production levels. In addition, the power generation cost is greatly influenced by the uncertainty of uranium price; thus, the sensitivities of those parameters were analyzed. By sensitivity analysis, the range of parameters required to improve the generation cost was clarified. We assumed that the throughput of fuel fabrication is reduced by one third by employing the above 5% enrichment fuel and the spent fuel is reprocessed in the FBR reprocessing plant. In conclusion, it is demonstrated that the power generation cost can be reasonably reduced by increasing enrichment up to 7% or more in the case that the uranium price is less than ten times as much as the reference price and also the increase in fabrication cost is prevented by introducing Erbia credit.

著者

本荘 晴朗 神谷 香一郎 佐久間 一郎 児玉 逸雄 山崎 正俊 荒船 龍彦

出版者

名古屋大学

雑誌

新学術領域研究(研究領域提案型)

巻号頁・発行日

2010-04-01

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多階層生物現象である心臓興奮伝播を高分解能光学マッピングを用いて定量的に解析し、そのダイナミクスが心筋イオンチャネル機能と細胞間電気結合および組織構築の相互作用により規定されることを示した。また、旋回性興奮(スパイラル・リエントリー)では興奮波の形状が興奮伝播を規定する重要な要因であることが明らかにした。スパイラル・リエントリーは細動や頻拍など頻脈性不整脈の基本メカニズムであり、旋回中心の不安定化が細動や頻拍の停止を促す不整脈治療戦略となることが示された。