| 摘要 |
PURPOSE:To detect the leakage of water from a heat transmission pipe existing in a downcomer part with high sensitivity by inserting athin-walled nickel pipe which allows the easy permeation of hydrogen into the downcomer so that the hydrogen in Na is conducted through the nickel pipe to a detector. CONSTITUTION:The thin-walled nickel pipe 11 is inserted, like the heat transmission pipe 3, into the downcomer 6 from a water header 5 and the top end thereof extended to the bottom of the downcomer 6. An ion pump 12 is attached in order to evacuate the inside of the pipe 11 and further an ion gage 13 for detecting the concn. of the hydrogen in the pipe is attached. When the pump 12 is operate, the inside of the pipe is evacuated to a vacuum and the hydrogen on the outside (Na side) of the pipe is permeated through the wall of the thin- walled nickel pipe into the pipe from which the hydrogen is carried to the ion gage 13. The concn. of the hydrogen is thus detected. |
