상온 및 액체질소 온도에서 고속 중성자 조사된 원자로 압력 용기의 취화 현상에 관한 연구

다국어 초록 (Multilingual Abstract)

The embrittlement of fast neutron-irradiated reactor pressure vessel (RPV) steels was investigated by X-ray diffraction patterns at room temperature and Mossbauer spectroscopy at room- and liquid nitrogen-temperature. Neutron fluence on the samples were 10¹², 10¹³, 10¹⁴, 10^(15), 10^(16), 10^(17), 10^(18) n/㎠. The X-ray diffraction patterns showed that the structure of the neutron unirradiated sample was bcc type, where as but the neutron irradiated samples with the fluence higher than 1017 n/㎠ were so severely damaged, that bcc type structure disappeared. The Mossbauer spectra of all samples showed superposition of two or more sextets. In this paper all Mossbauer spectra were fitted by three set of sextet. The isomer shift and quadrupole splitting values were found around zero. At liquid nitrogen temperature, magnetic hyperfine field and absorption area increase rapidly S1 sextet in the samples of 1017~1018 n/㎠ neutron fluences. And at room temperature, magnetic hyperfine field and absorption increased rapidly at S1 sextet in the samples of 1017~1018 n/㎠ neutron fluences. This rapid increase of magnetic hyperfine field and absorption area were inferred to be caused by the change of (56)^Fe, (55)^Mn into (57)^Fe due to by neutron irradiation.

참고문헌 (Reference)

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