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7- th International Scientific and Technical Conference « Safety, efficiency and economics of nuclear power » MNTK -2010. Moscow , 26-27 May 2010 JSC « Concern Rosenergoatom ». Secondary circuit heat-exchange equipment efficiency improvement. A.A.Avdeev

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  1. 7-th International Scientific and Technical Conference«Safety, efficiency and economics of nuclear power» MNTK-2010 Moscow, 26-27 May 2010 JSC «Concern Rosenergoatom» Secondary circuit heat-exchange equipment efficiency improvement A.A.Avdeev Director General, Doctor of Technical Sciences Open joint-stock company «All-Russian Research and Design-Engineering Institute of nuclear power machine building» JSC «VNIIAM»

  2. Efficiency Reactor island Turbine island >98% 33÷36% Almost all heat released in the core is supplied to secondary circuit Only the third part of heat is converted to electric power Today, technical problems center of gravity is in the turbine hall

  3. Economics evaluation How much higher can the cost of the turbine plant with efficiency increased by 1% be? Unit 1200 МW; Efficiencyэ = 36% Additional production: 33,3 МW э = 37% Capital expenditure to produce this power 3000 €/kW * 33,3 МW = 100 mln.€ Account is not taken of «small things»: fuel saving, specific operating expenses, etc. Note: cost of 1000 МW turbine (Kharkov): about 80 mln. € cost of 1200 МW turbine (St.Pb): about 100 mln. € It is more profitable to pay twice more for the turbine with efficiency increased by 1%. The turbine plant efficiency is determined by all the kit of turbine hall components.

  4. Effect of turbine plant К-1000-60/1500 parameters on electric power underproduction

  5. Parameters optimization • The optimization of turbine plant parameters requires: • Unit heat losses tests within the range of loads from 75 to100% from rated power; • condenser thermal tests with building of vacuum dependency on cooling water flow rate and temperature; • turbine power experimental corrections in case of changes in condenser spent steam pressure. Heat losses tests are conducted according to the first category of complexity with arranging additional inserts and applying the state-of-the-art fleet of high accuracy instruments.

  6. Test results 1. Normalization Pressure of the used steam in the condenser Unit power Electric power of NPP unit depending on the temperature of the incoming cooling water (under nominal power) 2. Identification and elimination of losses 3. Assessment of upgrading results

  7. NPP (Power Unit) turbine plant tests VVER-1000 Power Units with К-1000-60/1500-2-type turbines (Тurboatom, with basement-type condensers) are installed at Balakovo NPP (Units № 1÷4) and Rostov NPP (Units 1, 2). No thermal tests were performed at either of the Units.

  8. Vacuum effect on power generation

  9. Efficient vacuum Determination of cooling water optimum flow rate Power Underproduction Auxiliaries Cooling water flow rate Electric power consumption by circulation pumps Nц70÷80*Nс.н Nц Wох3

  10. Design deficiencies of double-stage cassete-type separator-steam reheater: • Low heat exchange intensity due to longitudinal tube ribbing; • There are conditions for non-condensable gases accumulation in tubes; • There is thermo-hydraulic instability. Temperature pulsations reach 70ºС; • Low reliability due to thermo-hydraulic instability; • In case of tube loss of tightness, one cassette is plugged; • Low maintainability, in particular, for low tier of heat-exchange cassettes; • Complex MSR pipe connections; • Large dimensions: MSR and и heated steam pipelines are located above the turbine servicing level. • Untransportable by railway. • MSR assembly during installation. • High metal intensity and high cost.

  11. Comparison of double-stage cassette-type and collector-platen type MSR (NPP-2006)

  12. Inter-receiver separator Powersep(BALCKE DURR) Turbulence chamber Condensate collection chamber A = wet steam with x – 13 % B = Water removal C = dry steam Flow chart of Powersep Turbulence chamber

  13. Inter-receiver separation system From high pressure cylinder • Consists of a film separator and two elbow separators sequentially installed according to steam stream in turbine plant receivers, • separated water flow rate: 102 m3/h • separation efficiency: 83% • dries moist steam up to 2 % • Increases overheatingby 8-10 К To SRS Film-type separator Separate Bow-type separator Special blades The steam inter-receiver separation system developed by JSC «VNIIAM» has been in operation at Kola NPP since the early 1990-ies and is designed for preliminary drying of moist steam coming from high pressure cylinder to moisture separator-reheater (MSR)

  14. Receiver of Kola NPP turbine К-220 with blades

  15. Thank you for your attention Our coordinates: 125171 Moscow, Cosmonaut Volkov street, 6А Phone: 8 (499)150-83-35; 8 (499)150-83-36 Fax: 8 (499)159-94-74 www.vniiam.ru JSC «All-Russian Research and Design-Engineering Institute of nuclear power machine building» (JSC «VNIIAM»)

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