Based on the treatment methods of hydrogen containing waste gas in domestic nuclear power plants and the in-spection guideline of TEG buffer tanks,combined with nuclear power plant system manuals,technical specifications,reg-ular tests,etc.,this paper outlines the treatment methods of hydrogen containing waste gas in M310 units and the opera-tion of TEG buffer tanks under long-term maintenance conditions.By using a simple theoretical model and the ideal gas state equation,a rational suggestion of setting a bypass pipeline for the buffer tank of the waste gas treatment system is analyzed and calculated,which provides a reference for the long-term maintenance condition of TEG buffer tanks.