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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 889 - 896 (8page)
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초록· 키워드
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The vertically inverted U-tube steam generator (UTSG) is widely used in the pressurized water reactor(PWR). The reverse flow behavior generally exists in some U-tubes of a steam generator (SG) under bothsingle- and two-phase natural circulations (NCs). The behavior increases the flow resistance in theprimary loop and reduces the heat transfer in the SG. As a consequence, the NC ability as well as theinherent safety of nuclear reactors is faced with severe challenges. The theoretical models for calculatingsingle- and two-phase flow pressure drops in U-tubes are developed and validated in this paper. Thetwo-phase reverse flow characteristics in two types of SGs are investigated base on the theoreticalmodels, and the effects of the U-tube height, bending radius, inlet steam quality and primary sidepressure on the behavior are analyzed. The conclusions may provide some promising references for SGoptimization to reduce the disadvantageous behavior. It is also of significance to improve the NC abilityand ensure the PWR safety during some accidents
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