a lance for lancing equipment for removing sediment of steam generator in nuclear power plant and control method therefor

摘要

The present invention relates to a lance for a lancing device for removing deposits in a nuclear power plant steam generator and a control method thereof, the object of which is to determine the distance between the nozzle of the lance body conveyed along the guide support rail and the inner surface of the steam generator, which is an arc surface. By adjusting the diameter of the nozzle of the lance body so that the nozzle of the lance body can be sprayed to have a spray pressure suitable for the measured distance, it prevents the dispersion of foreign substances such as sludge on the tube sheet due to the spray of the cleaning water under excessive pressure. In addition, while effectively collecting foreign substances such as sludge on the tube sheet, the spray angle of the nozzles located at both ends of the lance body is inclined in the direction of the midline of the length of the lance body, and foreign substances such as sludge at the bottom of the lance body are inclined. It is to be able to be pushed out and collected, and its configuration is a plurality of units that are connected in communication with the high-pressure washing water flow path in the lance body, mounted at regular intervals on the outer surface of the lance body, and whose spray hole diameter is adjusted by electric control. The two automatic injection nozzles and a distance measuring means mounted on the outer surface of the lance body to measure the distance between the automatic injection nozzle and the inner surface of the steam generator, and to transmit the measurement signal are provided on the outer surface, and the guide support rail A lance body that is transported along the line and sprays high-pressure washing water; The lance is electrically connected to the plurality of automatic injection nozzles and distance measuring means, respectively, and a control unit for adjusting the diameter of the injection hole of the electronic nozzle based on a distance measuring signal received from the distance measuring means; And an operation panel electrically connected to the control unit and having a command input unit for setting a control value for the automatic injection nozzle for each measurement distance value, and an adjustment unit for manually controlling the operation of the automatic injection nozzle by an operator. It is done.