operation and maintenance of dfah and hcsd system of 4x210 mw, htps, korba (west) ,outsourcing of iti certificate holder manpower for day to day operational activities of 1x500 mw extn., htps, korba ,dismantling erection and commissioning of new hrh coil assemblies of 210 mw units no. 2 of htps, korba (west)