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

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

4. - Relief valve in the pressurizer opens !

5. - Control rods are inserted !
OPEN
- Control rods are inserted !

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

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

8. - Relief valve is closed !
INSERTED
OPERATION
- Relief valve is closed !

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

10. Water level in the secondary side of stream generator is decreasing !
INSERTED
OPERATION
Water level in the secondary side of stream generator is decreasing !

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

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

13. There is no water in the secondary side of the steam generator !
INSERTED
NO WATER
OPERATION
There is no water in the secondary side of the steam generator !

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

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

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

17. INSERTED
NO WATER
WATER IS INJECTED
OPERATION
- Emergency core cooling system is now in operation because of the low pressure in the primary loop !

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

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

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

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

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

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

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

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

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

27. Water level is at the top of the pressurizer !
INSERTED
FULL WATER
NO WATER
WATER IS INJECTED
OPERATION
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 !
INSERTED
FULL WATER
NO WATER
WATER IS INJECTED
OPERATION
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.

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