Study of Performance Requirements and Construction Rule for 700 Degree-C Class Advanced USC Plant

In order to reduce carbon dioxide gas emission, the 700 degree-C class thermal power plant, of which plant efficiency improvement is achieved, has been studied in Japan. The plant technology is based upon advanced materials development, namely developments of high strength alloy, fireside corrosion resistant alloy, steamside oxidation resistant alloy and so on. A part of the materials which were developed are not set forth in the present domestic interpretation of the technical standard. And failure modes, which are estimated in 700 degree-C class A-USC components, are possible to be different from those in the 600 degree-C class USC components. Therefore the failure modes were considered in the 700 degree-C A-USC components and then the performance requirements were led based upon the failure modes. The study was initiated on June 2006 and the draft interpretation will be set forth by March 2011. In the paper the situation of the investigation for failure modes, performance requirements and the draft interpretation are reported.