bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - power plants; valves, heat exchangers, pressure vessels; buyer - shut down cooling heat exchanger shell removal & installation for isi activities , bleed condenser top cover, handhole cover, graylock joints and tube sheet assembly removal, replacement & installation , primary circulating pump mechanical seal replacement , preventive maintenacne and internal inspection of brake assembly of primary circulating pump motor of rating 6.6 kv / 6 mwe , opening, inspection and cleaning of winding cooler of pcp motor of rating 6.6 kv / 6 mwe , overhauling and inspection of shut down cooling pump , overhauling and inspection of moderator canned motor pump , overhauling and inspection of pht- moderator system control valves , overhauling and inspection of eccs system air operated valve along with actuator at reactor side , overhualing or replacement of radiologically active motorized valves of size 200 to 300 nb of moderator system , overhualing or replacement of radiologically active motorized valves of size 200 to 350 nb of pht system , overhauling of pht-mod system pneumatic actuators in reactor building , maintenance of pht- moderator system manual valve (size 3 to 14) at reactor side (including rv & nrv) , mainteancne or replacement of fire water system hose reel drum in reactor bulding , removal, shifting, assitance in testing at test bench facility and installation of snubbers of pcp motor, shut down heat exchanger, shut down pump, sg feed water piping & pht relief piping. , removal, cleaning and installation of distributer assembly per section of heavy water upgrading plant distillation unit/ column (including manhole and handhole cover opening and closing) , opening, cleaning and boxup of heavy water upgrading plant seal water circulating tank with inbuilt heat exchanger , reactor building and reactor auxiliary building hatch block removal and installation , emergency core cooling system rupture disc (16 inch size) replacement , reactor side bleed cooler shell type heat exchanger cover removal & installation for isi activities , inspection and necessary corrections on d2o lines in reactor auxillary building trenchs, including removal and installation of heavy hatch covers , hydraulic snubbers installation at reactor outlet headers , internal inspection of sds-2 tank, with opening of top flange (03 nos.) and bottom flange (01 no.) , deluge valve nozzle & header cleaning (1 dv consists of 90 nozzles on average) during gt/ut fire water isolation , ugp apw, chw, seal water, vacuum & steam condensate transfer pump & spare pumps overhauling , rb, rab & ugp manual valve diaphragm replacement , pht leakge collection pump overhauling and replacement , ugp condenser (reflux & top vent condenser) cover removal, inspection, cleaning & installation , moderator heat exchanger channel cover removal and installation for isi activities , pht system bellow sealed globe valves greasing & free operability check