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Evaluation of inter-laminar shear strength of GFRP composed of bonded glass/polyimide tapes and cyanate-ester/epoxy blended resin for ITER TF coils

ガラス・ポリイミドテープ及びシアネートエステル・エポキシ混合樹脂を用いたITER TFコイル用絶縁材の層間せん断強度の評価

辺見 努; 西村 新*; 松井 邦浩; 小泉 徳潔; 西嶋 茂宏*; 四竃 樹男*

Hemmi, Tsutomu; Nishimura, Arata*; Matsui, Kunihiro; Koizumi, Norikiyo; Nishijima, Shigehiro*; Shikama, Tatsuo*

原子力機構はITERトロイダル磁場(TF)コイル9個の製作を担当している。ITER TFコイルの絶縁システムは導体絶縁、ダブルパンケーキ(DP)絶縁及び対地絶縁の三層構造となっており、それぞれ、樹脂を真空含浸した多層のガラス・ポリイミド・テープから構成される。ITER TFコイルは20年間の運転中に10$$^{22}$$個/m$$^{2}$$の高速中性子に曝されるため、$$gamma$$線及び中性子線を合わせて10MGyの照射に耐える耐放射線性が要求される。ITER TFコイルに要求される耐放射線性を有する絶縁材として、シアネート・エステルとエポキシ樹脂の混合樹脂及びガラス・ポリイミド接着テープを用いた絶縁材を開発した。開発した絶縁材の耐放射線性を評価するため、原子炉で照射した絶縁材試験片の層間せん断強度を測定し、ITER TFコイルに適用可能な耐放射線性を有することを検証した。

Japan Atomic Energy Agency (JAEA), as Japan Domestic Agency, has responsibility to procure 9 ITER Toroidal Field (TF) coils. The insulation system of the ITER TF coils consists of 3 layers of insulations, which are a conductor insulation, a double-pancake (DP) insulation and a ground insulation, composed of multi-layer glass/polyimide tapes impregnated a resin. The ITER TF coils are required to withstand an irradiation of 10 MGy from $$gamma$$-ray and neutrons since the ITER TF coils is exposed by first neutron ($$>$$ 0.1 MeV) of 10$$^{22}$$ n/m$$^{2}$$ during the operation of 20 years in the ITER. Cyanate-ester/epoxy blended resins and bonded glass/polyimide tapes are developed as insulation materials to realize the required radiation-hardness for the insulation of the ITER TF coils. To evaluate the radiation-hardness of the developed insulation materials, the inter-laminar shear strength of glass-fiber reinforced plastics (GFRP) fabricated using developed insulation materials is measured as one of most important mechanical properties before/after the irradiation in a fission reactor of JRR-3. As a result, it is demonstrated that the GFRPs using the developed insulation materials have a sufficient performance to apply the ITER TF coil insulation.

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