秦山二期安全厂用水系统吸水暗渠泥沙测量及清淤技术

The Silt Measuring and Cleaning up Technique for the Underdrain of Essential Service Water System in Qinshan Second Nuclear Power Plant

为解决秦山二期安全厂用水系统（SEC）吸水暗渠泥砂淤积问题．论证暗渠水下淤积物测量和淤积物清理的可行性，成功地尝试了在只停泵、不排空暗渠水的状态下清除淤积物，并在清淤前后进行了物位测量以验证清淤效果。本文报告了SEC吸水暗渠清淤的技术方案、实施过程，清淤前后的测量结果及清淤效果评价．并对今后的暗渠清淤工作提出了建议。

In order to solve the problem that the underdrain of essential service water system in Qinshan Second Nuclear Power Plant was filled up with the silt, and demonstrate the feasibility of measuring and cleaning up the underwater silt in the underdrain, we successfully tested the silt cleaning up by stopping the pump without draining off the water from the underdain, and made the measurement before and after the silt cleaning up work for the purpose of validating its effect. This paper reports the technical project, implementary process, and the measuring results before and after the silt cleaning up of the underdrain, and the evaluation of the silt cleaning up effect. It also proposes our suggestions about the future silt cleaning up work for the underdrain.