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Identification on Fatigue Failure of Impeller at Single Stage Feedwater Pumps During Commissioning Operation
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  • Identification on Fatigue Failure of Impeller at Single Stage Feedwater Pumps During Commissioning Operation
  • Identification on Fatigue Failure of Impeller at Single Stage Feedwater Pumps During Commissioning Operation
저자명
김연환,김계연,배춘희,이영신,Kim. Yeon-Whan,Kim. Kye-Yean,Bae. Chun-Hee,Lee. Young-Shin
간행물명
한국소음진동공학회논문집
권/호정보
2008년|18권 9호|pp.937-942 (6 pages)
발행정보
한국소음진동공학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

영문초록

이 논문은 건설이 완료된 700MW급 발전소의 시운전 기간 중 주 급수펌프 임펠러에서 반복적으로 발생된 웨어링 이탈 및 고착, 슈라우드 손상 그리고 축 절단 등의 절손이 부분부하 조건에서 증폭되는 압력맥동과 연관이 있는 것으로 규명되었다.

기타언어초록

This paper presents a case history on failures of impeller and shaft due to pressure pulsation at single stage feed water pumps in 700 MW nuclear power plant during commissioning operation. The pumps had been service and had run for approximately $40{sim}50$ hours. For the most part, the failures of impeller occurred with the presence of a number of fatigue cracks. All cracks were associated with the deleterious surface layer of impeller by visual and metallurgical examination. On-site testing and analytical approach was performed on the systems to diagnose the problem and develop a solution to reduce the effect of exciting sources. A major concern at high-energy centrifugal pump is the pressure pulsation created from trailing edge of the Impeller blade, flow separation and recirculation at centrifugal pumps of partial load. Pressure pulsation due to the interaction generating between impeller and casing coincided with natural frequencies of the impeller and shaft system during 1ow load operation. It was identified that dynamic stress exceeding the fatigue strength of the material at the thin shroud section due to the hydraulic instability at running condition below BEP.