- Condensate pump and feed pump trip! Turbine trips!

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

- Relief valve in the pressurizer opens !

- Control rods are inserted ! OPEN - Control rods are inserted !

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

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

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

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

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

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

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 !

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 !

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 !

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

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 !

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

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 !

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

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 !

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

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 !

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.

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 !

- 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 !

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…

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 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.

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 !