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Activation properties of Nb$$_{3}$$Sn, NbTi and GFRP irradiated with D-T neutrons

D-T中性子照射によるNb$$_{3}$$Sn, NbTi及びGFRP材料の放射化特性

落合 謙太郎; 西村 新*; 西谷 健夫; 西嶋 茂宏*

Ochiai, Kentaro; Nishimura, Arata*; Nishitani, Takeo; Nishijima, Shigehiro*

核融合炉用超伝導コイル候補材であるNb$$_{3}$$Sn, NbTi及びGFRP材料のDT中性子照射実験を行い、それらの放射化特性を調べた。照射サンプルはNb$$_{3}$$SnとNbTiのマルチフィラメント線材及び商業用GFRP(G10CR)を用いた。原子力機構の核融合中性子源施設FNSを用いて4$$times$$10$$^{19}$$n/m$$^{2}$$まで照射し、照射後サンプルの線量率と誘導$$gamma$$線エネルギースペクトルを測定した。測定の結果、主要な放射性核種はNb-92m, Sn-117m, Sn-113とCo-60であった。また、Na-24, Na-22, Sc-47, Co-57, As-74, Rb-83, Mn-54と若干の未知の放射性核種がGFRPから検知され、GFRP中の付加化合物の放射化によるものであることがわかった。Nb$$_{3}$$Sn, NbTiとGFRPサンプルの照射直後の線量率は160$$mu$$Sv/h, 120$$mu$$Sv/hと20$$mu$$Sv/hであった。照射から5ヵ月後の線量率はいずれも約3$$mu$$Sv/hまで減衰した。また$$gamma$$線エネルギースペクトル測定の結果からNb$$_{3}$$SnとNbTi線材及びGFRPの最終的な線量率はCo-60(5.27y)及びNa-22(2.60y)によって支配されることを明らかにした。

Nb$$_{3}$$Sn, NbTi wires and glass fiber reinforced plastics (GFRP) are prospective candidate materials of the superconducting coil assembly for fusion reactors. These materials are activated by D-T neutrons penetrating through the reactor core. From the radioactive waste point of view, it is important to investigate the activation properties for these candidate materials. However, no experiment has been done to investigate the activation properties for these materials. Therefore, we have carried out the experimental investigation of the activation properties of Nb$$_{3}$$Sn, NbTi wires and GFRP materials. The neutron irradiation experiment has been done by the FNS D-T neutron source of JAEA. We used complex multi-filaments wires of Nb$$_{3}$$Sn and NbTi produced by FURUKAWA-electric Ltd. and a commercial GFRP (G10CR) plate. These samples were irradiated up to the neutron fluence of 4$$times$$10$$^{19}$$n/m$$^{2}$$ corresponding to about one twentieth neutron fluence expected for ITER life time. After the cooling time, the dose rates and the emitted $$gamma$$-ray spectra were measured with a survey meter and a Ge detector, respectively. Induced major radioactive nuclides are Nb-92m, Sn-117m, Sn-113 and Co-60 for Nb$$_{3}$$Sn, and Nb-92m, Sc-46 and Co-60 for NbTi. Also Na-24, Na-22, Sc-47, Co-57, As-74, Rb-83, Mn-54 and some unknown radioactive nuclides were observed from the irradiated GFRP. It is considered that those radioactive elements are due to the activation of the additive compounds in GFRP. The initial dose rates of the irradiated Nb$$_{3}$$Sn, NbTi and GFRP samples were 160$$mu$$Sv/h, 120$$mu$$Sv/h and 20$$mu$$Sv/h, respectively. After 5 months from the irradiation, these dose rates were reduced to 2-4$$mu$$Sv/h. Also, from the measured $$gamma$$-ray spectra, it was found that the final dose rates of Nb$$_{3}$$Sn and NbTi wires were dominated by Co-60 (5.27y) and the that of GFRP was dominated by Na-22 (2.60y).

使用言語

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English

掲載資料名

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巻

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号

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ページ数

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発行年月

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発表会議名

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12th International Conference on Fusion Reactor Materials (ICFRM-12)

開催年月

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2005/12

開催都市

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Santa Barbara

開催国

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U.S.A.

キーワード

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no keyword

特許データ

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PDF

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論文URL

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研究データの公開先DOI

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使用施設

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FNS(核融合炉物理用中性子源施設)

広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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核融合科学研究所

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- Accesses

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