7
DN 80
DN 80
DN 80
DN 80
DN 80
DN 80
DN 150
DN 150
DN 150
DN 150
DN 150
DN 150
DN 150
DN 150
VS99
VS99
VS99
VS99
VS66
VS66
VS66
VS66
PDE
PDE
PDE
PDE
SEMPELL
MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
VALVE ASSEMBLY
At the type APR 1400 reactors, four pressurizer safety relief valves type VS99 are mounted in a
horizontal position directly on the pressurizer, to ensure a compact arrangement and optimized
pipe conduction. Two proven self-acting spring-loaded pilot valves type VS66 per main valve
are used for redundancy, whereby the impulse and pilot lines can be isolated by integrated stop
valves.
The steam pilot valves are connected to system pressure by independent feeding lines within the
main valve inlet flange. No external lines are foreseen producing this compact design.
4
VS99 safety valve
4 x 2 VS66 self-acting spring-loaded pilot valve
with stop valve for the pilot line
4 x 1 PDE (doubled) bleed and feed valve
A double motor pilot valve type PDE serves as the so-called bleed and feed valve, to open the main
valve under the set pressure of the VS66 pilot valve.
Comprehensive tests and qualifications for the horizontal position of the main valve have been
successfully concluded. In December 2011, attended by the ANI (Authorized Nuclear Inspector),
the design was granted the NV stamp. The valve station is qualified for steam, two-phase flow
(water-steam) and supercooled water.
THE KOREAN APR1400 SOLUTION
Springloded
pilot valve
Pressurizer
Safety relief
valve
Pilot
valve
Pressurizer relief tank
Содержание Sempell PSRV VS99
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