| 摘要 |
Through two accesses lying substantially opposite one another, above the bottom of the steam generator, a high-pressure lance carrying at its end a spray head, is brought between the pipes of the pipe bundle. The two lances are simultaneously intermittently shifted inwards or outwards and between the shiftings, when the spray heads may spray between the rows of the pipe bundle, the lances are swung to-and-fro over 180 DEG . At least during said swinging, liquid is sprayed through said heads under a pressure higher than 200 bars and with a total flow rate for the two spray heads of more than 200 liters per minute. The used liquid is sucked away from the bottom with a total sucking capacity which is markedly higher than said flow rate.
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