Designing of district heating systems based on power plants modified for heat supply

The possibilities are discussed of reconstructing 50, 55, 110 and 200 MW turbines in condensing steam power plants and applying them to heat supply purposes. For nuclear power plants, the variants are studied of steam production using an inserted pressurized water circuit and in heat exchangers, and of the production of low-temperature low-pressure steam from hot water with subsequent compression to the necessary pressure level. For external heat supply from nuclear power plants, exclusively uncontrolled steam extraction is used. Contrary to 440 MW units, the design of the 1000 MW turbine makes possible a rather high heat supply by uncontrolled extraction. Heat extraction is being considered for all WWER type nuclear power plants in Czechoslovakia. (B.S.)