Method and apparatus for a jet pump three point slip joint clamp

摘要

A method and apparatus for providing a Boiling Water Reactor (BWR) jet pump three point slip joint clamp to mitigate sleep joint leakage flow induced vibration of a BWR jet pump assembly. A collar, provided as one seamless component or in separate portions, is installed on the upper crown of a diffuser. The collar includes a lower set of fasteners and an upper set of fasteners that contact the inlet mixer and diffuser, respectively, to horizontally stabilize the inlet mixer in a fixed position inside of the diffuser. The upper fasteners may be anchored by bosses that ensure a light-weight design of the collar. An optional cantilevered seal (including a cantilevered overhang and a lip) may mitigate leakage from the slip joint interface.

主权项

1. A boiling water reactor (BWR) jet pump assembly slip joint clamp, comprising:
a circular collar with an annular, vertical sidewall having top and bottom surfaces, the collar having a longitudinal central axis existing along a vertical line running through the center of the collar; at least one horizontally-oriented first fastener penetrating through the vertical sidewall of the collar, the at least one first fastener being radially aligned with the longitudinal central axis of the collar; and at least one horizontally-oriented second fastener penetrating through the vertical sidewall of the collar, the at least one second fastener being radially aligned with the longitudinal central axis of the collar, the at least one first fastener penetrating the vertical sidewall closer to the bottom surface of the vertical sidewall, at a lower elevation of the sidewall, as compared to the location of the at least one second fastener.