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Generic VVER 1000 MWe

Generic VVER 1000 MWe. Loss of Feedwater at Full Power Loos of ofsite power – assumed Emergency FW 3&4 – disabled Steam bypass to condenser ( BRU -K ) – disabled. Initial conditins (steady-state). Reactor thermal power 3119 MW RPV pressure 15.3 9 M P a

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Generic VVER 1000 MWe

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  1. Generic VVER 1000 MWe Loss of Feedwater at Full Power Loos of ofsite power – assumed Emergency FW 3&4 – disabled Steambypass to condenser (BRU-K) – disabled

  2. Initial conditins (steady-state) • Reactor thermal power 3119 MW • RPVpressure 15.39 MPa • RPV coolant in/out temp. 291.6 / 324.6 degC • MCP flow 4147 kg/sec / loop • Feedwater flow 424.5 kg/sec / SG • Feedwater temp. 220 degC • Steam press. (sg dome) 6.145 MPa • SG water level 2.12 m • Pressurizer water level 8.88 m

  3. Nodalization diagram - RPV

  4. Nodalization diagram – Loop 1 (Broken)

  5. Nodalization diagram – Loop 2 (Intact)

  6. Nodalization diagram – Loop 3 (Intact)

  7. Nodalization diagram – Secondary System

  8. Initial state

  9. Initial state

  10. Accident description

  11. 230 sec after the LOFW

  12. Sequence of Events and Systems Operations

  13. Only BRU-A signals since 2000 sec

  14. Plots for the short time range0 – 1000 secTime of the FW loss: 100 sec

  15. Plots for the long time range0 – 3600 secTime of the FW loss: 100 sec

  16. Final state

  17. Final state

  18. Final state

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