[en] In a jet pump for a nuclear reactor a slip joint is provided between the mixer and diffuser sections thereof to facilitate jet pump maintenance and to allow thermal expansion. To limit leakage flow through the slip joint to a rate below that which causes unacceptable flow induced vibration of the pump, there is provided a labyrinth seal for the slip joint in the form of a series of flow expansion chambers formed by a series of spaced grooves in the annulus of the slip joint

No abstract available

No abstract available

[en] Cavitation characteristics of a jet pump were explored in tests with 80 C and 280 C water. A cavitation coefficient based on suction velocity and net suction head was used to correlate results. Results at low temperature compared well with results in literature. Results at high temperature and comparison of jet pump cavitation at low and high temperatures are the first to be reported as far as known. The jet pump was substantially less susceptible to cavitation at 280 C than at 80 C. The effects of cavitation, as indicated by drop-off in jet pump performance, vibration, and acoustic noise, were also much less severe at 280 C than at 80 C