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- W2055134930 abstract "Jet pumps are key components to feed cooling water into reactor core in boiling water reactor. Inside condition of jet pumps is high flow condition. Therefore, jet pumps have risk of damages by flow-induced vibration, especially, the leakage-flow-induced vibration at the slip joint between the inlet mixer and the diffuser in extended power uprating condition with increasing core flow rate or particular operating condition such as single loop operation that increases differential pressure of the slip joint. To mitigate the risk of the leakage-flow-induced vibration, slip joint extension which can be installed on the top of diffuser was developed (See Figure 1). Self-excited vibration is treated as negative damping i.e. unstable state. It is well-known that the leakage flow through divergent gap flow passage causes the negative damping. However, the configuration of the gap flow passage of the slip joint with slip joint extension is complicated flow passage which consists of convergent, divergent and parallel flow passage region. To addition to this, the leakage flow direction in normal or power uprating condition is opposite to in abnormal operating condition such as single loop operating. Therefore, it is necessary to identify the optimum configuration of gap flow passage of the slip joint extension to suppress leakage-flow-induced vibration for various operating conditions. To achieve this goal, the gap flow passage of the slip joint extension was determined using transfer matrix method based on the leakage-flow-induced vibration theory. The effect and characteristic of vibration suppression for the slip joint extension was confirmed by fundamental tests that simulated the slip joint configuration." @default.
- W2055134930 created "2016-06-24" @default.
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- W2055134930 date "2014-07-07" @default.
- W2055134930 modified "2023-09-24" @default.
- W2055134930 title "Flow-Induced Vibration Suppression of Jet Pump in Boiling Water Reactor by Slip Joint Extension" @default.
- W2055134930 doi "https://doi.org/10.1115/icone22-30700" @default.
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