5
VTS1
VS99
DN 250
VTS1
VS99
DN 200
ETS1
DN 25
DN 50
DN 80
VS66
DN 25
VCA
DN 15
VS99
DN 125
DN 250
DN
12
5
DN
12
5
DN
12
5
DN 25
DN 15
DN 25
DN 25
DN 50
DN 25
DN 25
ETS1
DN 25
DN 50
DN 80
DN 25
DN 50
DN 25
DN 25
DN 15
DN 25
VTS1
ESS1
SEMPELL
MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
THE GERMAN KWU-PWR SOLUTION
2
VS99 safety valve
2 x 4 VS66 self-acting spring-loaded pilot valve
with stop valve for the pilot line
2 x 2 ETS (doubled) stop valve
2 x 1 PDE (doubled) bleed and feed valve
2 x 1 VTS1 stop valve for pressure measurement
1
VS99 blowdown valve
1 x 1 VCA solenoid valve
1 x 1 PDE (single) bleed and feed valve
1 x 1 VTS1 stop valve for pressure measurement
VALVE ASSEMBLY
At German pressurized water systems of the KWU, three main valves type VS99 are installed in
the pressurizer system: two providing double redundancy plus one operational blow-down valve.
The VS99 safety valve
For optimized availability, four self-acting spring-loaded pilot valves type VS66 were mounted
redundantly to each main valve: two are in service, two rest in standby. These spring-loaded pilot
valves operate autonomously; no external energy is needed to open them. Each pilot valve, as
needed, can be blocked by a stop valve.
In the case of the emergency cooling, the system pressure must be reduced. This is accomplished
with a pressure relief valve type PDE, which is electrically actuated and therefore can also be
opened below the set pressure of the VS66. The process of the primary circuit pressure relief to
ensure the emergency cooling supply is referred to as the "bleed and feed" process.
Pilot operated
safety relief valve
Solenoid valve
Pilot operated
safety relief valve
PDE-valve
PDE-valve
Blowdown valve
Stop valve
Pressurizer relief tank
Pressurizer
PDE-
valve
Spring
loaded
pilot
valves
The VS99 blowdown valve
In addition to the pressurizer safety relief valves, a blowdown valve is arranged on the dome of
the relief tank and connected with the steam chamber of the pressurizer by a blowdown line.
A stop valve is installed upstream of the blowdown valve. The construction of the blowdown
valve corresponds to the construction of the pressurizer safety relief valve; nonetheless on the
pressurizer blowdown valve, a solenoid valve is installed as pilot valve. In normal operation, the
blowdown valve and the pilot valve are closed. When required, the pilot line is opened by the
solenoid valve and opens the blowdown valve. The blowdown valve can also be actuated by the
motor-driven bleed and feed valve.
Содержание Sempell PSRV VS99
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