Abstract: Regarding the problem that the measured clearance value in disassembled casing condition cannot reflect the actual operation status when using the traditional method to measure the large capacity nuclear turbine clearance, this paper introduces a laser-track based clearance control technique, i.e. TCCS, which can be applied for assembled casing condition. Compared with the traditional method, the advantages and limitations of TCCS are presented. The data analysis is conducted for the first TCCS application case of domestic large capacity nuclear turbine and the problems in the application are put forward. Considering the actual situation on site, 15 action items from four aspects are proposed and carried out. Through the implementation of these action items, the problems are solved, the application of TCCS on site is improved and satisfactory result is achieved eventually.

Key words: clearance, TCCS, nuclear turbine, rmeasurement