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Post-irradiation SEM study of ZrC-based TRISO coatings from the PYCASSO experiments

PYCASSO試験で照射したTRISO被覆ZrC層のSEMによる照射後研究

Hania, R.*; M$'e$nard, G.*; 相原 純 ; 植田 祥平   ; Knol, S.*; De Jong, A.*; Van den Berg, F.*; Van Staveren, T.*; De Groot, S.*

Hania, R.*; M$'e$nard, G.*; Aihara, Jun; Ueta, Shohei; Knol, S.*; De Jong, A.*; Van den Berg, F.*; Van Staveren, T.*; De Groot, S.*

被覆燃料粒子のさまざまな被覆材料の高温照射特性を調べるためにPYCASSO照射試験が実施され、その一部として先進的材料である炭化ジルコニウム(ZrC)が評価された。原子力機構が製作した熱分解炭素(PyC)/ZrC被覆模擬粒子がHFRにて照射温度900$$^{circ}$$C及び1,100$$^{circ}$$C、照射量約2dpaの条件で照射され、現在、電子顕微鏡による照射済並びに未照射試料の研究が進められている。本研究は、ZrC微細構造への照射効果及び製造後熱処理の影響を調べることを目的とする。SEMによる予備試験の結果、ZrCの端面の顕著な粗粒化、ZrCの脆化、並びに内側PyC-ZrC層境界面の脆弱化が見られ、これらは照射効果よりも温度1,800$$^{circ}$$Cの熱処理の影響が支配的であると示唆されたものの、被覆層の微細構造や強度に照射による有意な影響は見られなかった。

The PYCASSO irradiation experiments have been conducted to determine the effect of irradiation at high temperature on the properties of various coating materials of the coated fuel particle. One part of PYCASSO is to evaluate the advanced barrier material ZrC. Pyrocarbon (PyC) / ZrC-coated ZrO$$_{2}$$ and Al$$_{2}$$O$$_{3}$$ particles fabricated by JAEA were irradiated by HFR at 900 $$^{circ}$$C and 1,100 $$^{circ}$$C, at the same flux level up to approximately 2 dpa. Samples of irradiated and unirradiated particles are under investigation using an electron microscope, with the aim to identify irradiation effects and the influence of the heat treatment after the fabrication on the ZrC microstructure. Preliminary results of this SEM study indicate that whereas the heat treatment at 1,800 $$^{circ}$$C prior to irradiation induces significant grain growth near the ZrC edges, embrittling the ZrC layer and weakening the iPyC-ZrC interface, irradiation has no noticeable effect on microstructure and coating strength.

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