| 摘要 |
A method for the remote testing of spray nozzles on headers in a nuclear reactor containment building to determine whether the nozzles are open or blocked. Heated air under pressure is supplied to the headers, and an open nozzle reaches a higher temperature than a blocked nozzle. The headers and nozzles are scanned by an infrared camera having a thermogram display, and open nozzles appear in the thermogram as extending from the headers whereas blocked nozzles appear as minor protrusions on the headers. The camera is mounted on a polar crane within the building, the crane having an axis of rotation which coincides with the axes of the headers and the camera being displaced from the crane axis, and the crane is rotated around its axis during the scanning of the headers and nozzles by the camera.
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