| 摘要 |
PROBLEM TO BE SOLVED: To provide an in-nozzle high-pressure cleaning device of a reactor jet pump which enables the simplification of the whole structure by setting up no working mechanism such as an electrically-driven motor inside the device and can remove crud inside the nozzle while keeping an inlet mixer placed in a reactor pressure vessel. SOLUTION: The in-nozzle high-pressure cleaning device 4 of the reactor jet pump 6 includes: a pipe 11; a cleaning head 10 placed at one end of the pipe 11; a high-pressure hose 15 connected to the other end of the pipe 11 to supply water into the pipe 11; and a positioning guide 13 located in a throat 2 to guide the pipe 11 therein and lead it toward the nozzle 3. The cleaning head 10 has numerous injection holes 10a for jetting water in the horizontally whole peripheral direction. Such contrivance needs no working mechanism that rotates the cleaning head 10 and makes its vertical movement inside the nozzle 3 of the inlet mixer 1, and the in-nozzle high-pressure cleaning device 4 is thereby simplified. COPYRIGHT: (C)2007,JPO&INPIT
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