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논문 기본 정보

자료유형
학술저널
저자정보
전순혁 (한국원자력연구원) 한지영 (한국원자력연구원) 박진호 (한국원자력연구원) 하성준 (한국원자력연구원) 심희상 (한국원자력연구원) 김성우 (한국원자력연구원)
저널정보
한국압력기기공학회 한국압력기기공학회 논문집 한국압력기기공학회 논문집 제20권 제2호
발행연도
2024.12
수록면
158 - 169 (12page)

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초록· 키워드

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During long-term operation of pressurized water reactors (PWRs), hydrogen diffusion from the primary to the secondary side of the steam generator (SG) tube can occur due to the difference in hydrogen concentration between the primary coolant and the secondary coolant. Therefore, the secondary side of SGs in PWRs could be subject to this potential degradation mechanism. In particular, in the crevices between SG tube and tube support plate, the aggressive chemical impurities can be concentrated in the porous magnetite deposits to form the highly corrosive environment by means of local boiling. Despite the replacement of Alloy 600 tubes with Alloy 690 tubes, the general corrosion of SG tubes remains a potential problem that can reduce the integrity of SGs. The purpose of this investigation is to elucidate the general corrosion behavior of Alloy 600 and Alloy 690 SG tube in alkaline solution containing the impurities and hydrogen. The representative impurities such as Pb, Na, Cl and S were selected to simulate the chemistry of SG crevices. In both SG tube specimens, the polyhedral oxide particles were mainly observed with some round oxide particles. Compared with Alloy 600 tube specimen, the general corrosion rate of Alloy 690 significantly increased. In the case of the corrosion test for 3000 h, the corrosion rates of Alloy 690 tube specimen increased by about 7.8 times, compared with that of Alloy 600 tube specimen. The concentration of Pb contents of the oxide layers formed on Alloy 690 tube specimen was higher than that of Alloy 600 tube specimen. The mechanism of the difference in the general corrosion behavior between Alloy 600 and Alloy 690 SG tubes was discussed from the viewpoint of the thermodynamically consideration between alloying elements and Pb and E-pH diagram.

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ABSTRACT
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
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