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논문 기본 정보

자료유형
학술저널
저자정보
이형연 (한국원자력연구원) 이제환 (한국원자력연구원) 최현선 (피레타)
저널정보
한국압력기기공학회 한국압력기기공학회 논문집 한국압력기기공학회 논문집 제16권 제1호
발행연도
2020.6
수록면
74 - 83 (10page)

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이 논문의 연구 히스토리 (4)

초록· 키워드

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A number of so-called ‘Type IV’ cracking was reported to occur at the welded joints of the P91 steel or P92 steel reheat steam piping systems in Korean supercritical thermal power plants. The reheat steam piping systems are subjected to severe thermal and pressure loading conditions of coolant higher than 570℃ and 4MPa, respectively. In this study, piping analyses and design evaluations were conducted for the piping system of a specific thermal plant in Korea and suggestions were made how structural integrity could be improved so that type IV cracks at the welded joints could be prevented. Integrity evaluations were conducted as per ASME B31.1 code with implicit consideration of creep effects which was used in original design of the piping system and as per nuclear-grade RCC-MRx code with explicit consideration of creep effects. Comparisons were made between the evaluation results from the two design rules. Another approach with modification or reduction of the redundant supports in the piping systems was investigated as a tool to mitigate thermal stresses which should essentially contribute to prevention of Type IV cracking without major modification of the existing piping systems. In addition, a post weld heat treatment method and repair weld method which could improve integrity of the welded joint of P91 steel were investigated.

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ABSTRACT
1. 서론
2. 재열증기배관계통의 설계조건 및 설계기술기준
3. 재열증기배관계통의 건전성 평가
4. 재열증기배관의 건전성 제고 방안
5. 결론
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