1. 1

2. - Condensate pump and feed pump trip! -Turbine trips! 2

3. - Condensate pump and feed pump trip! -Turbine trips! -Temperature and pressure in the primary loop is increasing! 3

4. - Relief valves opens in the pressurizer ! OPEN 4

5. - Control rods are inserted ! OPEN INSERTED 5

6. -Pressure in the primary loop is decreasing ! INSERTED 6 OPEN

7. - Emergency feed pump is now in operation ! INSERTED OPERATION 7 OPEN

8. - Relief valve is closed ! INSERTED OPERATION 8

9. - Pressure in the primary loop is decreasing ! INSERTED OPERATION 9

10. -Water level in the stream generator is decreasing ! INSERTED OPERATION 10

11. -Pressure in the primary loop is decreasing ! INSERTED OPERATION 11

12. INSERTED OPERATION 12 -Water level in the pressurizer is gradually increasing ! -Pressure in the primary loop is decreasing !

13. INSERTED OPERATION 13 NO WATER -There is no water in the steam generator !

14. INSERTED OPERATION 14 NO WATER -Water level in the pressurizer is gradually increasing ! -Pressure in the primary loop is decreasing !

15. INSERTED OPERATION 15 NO WATER -Why is pressure in the primary loop decreasing even though water level is increasing?

16. INSERTED OPERATION 16 NO WATER -Water level in the pressurizer is gradually increasing ! -Pressure in the primary loop is decreasing !

17. - Emergency core cooling system is now in operation ! INSERTED OPERATION WATER IS INJECTED 17 NO WATER

18. -Water level in the pressurizer is increasing ! -Pressure in the primary loop is decreasing ! INSERTED OPERATION WATER IS INJECTED 18 NO WATER

19. -It might be dangerous if the amount of water is too much in the primary loop… INSERTED OPERATION WATER IS INJECTED 19 NO WATER

20. -Water level in the pressurizer is increasing ! -Pressure in the primary loop is decreasing ! INSERTED OPERATION WATER IS INJECTED 20 NO WATER

21. -Emergency core cooling system is operated by the manual mode from now ! INSERTED OPERATION WATER IS INJECTED 21 NO WATER

22. -Water level in the pressurizer is increasing ! -Pressure in the primary loop is decreasing ! INSERTED OPERATION WATER IS INJECTED 22 NO WATER

23. -One of two emergency core cooling systems is manually stopped and the injection water from the other one is reduced. INSERTED OPERATION WATER IS INJECTED 23 NO WATER

24. -Water level in the pressurizer is increasing ! -Pressure in the primary loop is decreasing ! INSERTED OPERATION WATER IS INJECTED 24 NO WATER

25. - Water level is reaching the top of the pressurizer ! INSERTED OPERATION WATER IS INJECTED 25 NO WATER FULL WATER

26. - Water in the pressurizer is full, but measurement data at other positions in the primary loop do NOT show consistent results… INSERTED OPERATION WATER IS INJECTED 26 NO WATER FULL WATER

27. INSERTED OPERATION WATER IS INJECTED 27 NO WATER FULL WATER -Water level is at the top of the pressurizer ! -Pressure of the primary loop is decreasing !

28. -Water level is at the top of the pressurizer ! -Pressure of the primary loop is decreasing ! -Water in the containment sump is moved to the auxiliary building. INSERTED OPERATION WATER IS INJECTED 28 NO WATER FULL WATER

29. -The block values on the emergency feed water line pump have been CLOSE ! Why ! -Now it is OPEN ! INSERTED OPERATION WATER IS INJECTED 29 FULL WATER