Emerson Sempell PSRV VS99 User manual

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

The design, construction and activation of the safety valves depends on the

design of the respective reactor and the corresponding specifications

FEATURES

• Extremely high sealing force, ensuring leak

tightness up to the set pressure.

• Very precise reproducibility of set pressure

and small operating pressure differences,

accuracy of pilot set pressure opening value

with repeats better 1%.

• All parts essential for function are kept at

operating temperature, thus no thermal shock.

• The disc piston is the only moving part in the

main valve, providing reduced maintenance.

• Low or high pressure in-situ test during

operation to preventive maintenance.

• Compact design from forged stainless steel.

• Redundancy of pilot valves and diversity of

function principle of pilot valves according to

specification.

• Suitable for all types of nuclear reactors.

TECHNICAL DATA

Size: Up to DN 200

Temperature: Up to 371°C

Pressure: Up to 200 bar

According to customer requirements and

specifications.

GENERAL APPLICATION

Pressurizer safety relief valves protect the

pressurizer from overpressure and must

ensure the following functions:

• Pressurizer relief for normal operating

transients

• Hot and cold overpressure protection on

liquid, steam, gas and steamwater-mixture

• Depressurization of reactor coolant system

following an accident

VCTDS-03163-EN 17/05

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

Pressurizer safety relief valves

Containment building

Blowdown

tank

Pressurizer

Steam

generator

Turbine

Generator

Air and water vapor

Condenser

Water

Preheater

Emergency cooling system

Reactor

sump

Reactor pressure vessel

Cooling

tower

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

INTRODUCTION

Pilot operated safety relief valves are used to protect the pressurizer against overpressure. In

pressurized water reactors, the energy of the primary circuit is transferred to the secondary

steam system by the steam generators. The pressurizer compensates for any expansion in the

coolant volume occurring during operation and accidents. The design criterion for pressurizer

safety valves is not the reactor power but the maximum possible volume expansion of the coolant

in response to a temperature increase.

The valves' design takes into account the combination of failures which will produce the maximum

possible pressure and temperature rise, leading to the maximum blowoff rates required. The

VS99 is a pilot operated safety relief valve which operates to the relief principle. The operating

pressure is applied to the valve disc. When the pressure increases, the sealing force on the valve

seat rises.

HISTORY

1970 First delivery of pilot-operated safety

valves to NPP Stade in Germany

based on a conventional technology.

1980 Qualification under hot water

conditions.

1985 ATWS qualification.

1990 First supply of PDE valves with Sieka

actuator.

1992 First installation of degasification.

2003 ASME III qualification

2011 First delivery of pilot-operated safety

valves with ASME NV stamp.

The safety valve will follow the commands of the pilot valves: If the pilot valves open, the safety

valve opens; if the pilot valves close, the safety valve closes.

Several pilot valves are assigned to each safety valve. Each pilot valve has a pressure relief line

and a pilot line. Each pilot valve can be blocked for repair purposes. The corresponding stop

valves are locked by valve locking devices according to the regulations, in such a way that each of

the pressurizer safety relief valves is always kept ready for operation by at least one functioning

pilot valve.

For the entire control system, i.e. for the main valve with the associated pilot valves, an

earthquake-proof design with a compact arrangement is recommended. With such a design,

pipelines as pilot lines are completely eliminated. Thus pressure chambers to be relieved are as

small as possible. The dead times during discharge and loading are therefore small.

Sempell has a large installation base of pressurizer safety relief valves in all German

Siemens/KWU reactors and in most of the Russian PWR reactors type VVER, as well as the GEN III

reactors, such as the French EPR and the Korean APR1400.

Over the years, comprehensive qualification programs for the different reactor types have been

carried out. Sempell has the requisite quality assurance systems and is qualified in accordance

with KTA and ASME III.

Based on this experience and the technological development, Sempell offers special solutions

for the new GEN III reactors. The valves for the European EPR are delivered in accordance with

RCC-M, the valves for the Russian PWR (type VVER) in accordance with NP-068-05 and the valves

for the Korean APR1400 in accordance with ASME III (NV stamp).

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

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 125

DN 25

DN 15

DN 25

DN 50

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.

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

DN 80

DN 150

VS99

VS99 VS99 VS99

VS66

VS66 VS66 VS66

PDE

PDEPDEPDE

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

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

VS99

DN50

DN25

DN15

DN200

DN150

VS99VS99

DN400

DN200

DN150

DN25

DN 51

DN25

DN 51

DN25

DN150

DN25 DN25 DN25

DN15

DN25 DN25

DN25

DN25 DN25 DN25 DN25

DN25

DN50

DMSDMSDMS

DN 51

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

VALVE ASSEMBLY

At the reactor type EPR, three pressurizer safety relief valves type VS99 are mounted directly to

the side of the pressurizer. The inlet is arranged at an angle of 45°. Therefore the valve is installed

in a vertical position. A permanent water loop fills the main and pilot valves, so during blow down

purely sub-cooled water will be relieved first.

Two newly developed type Sierion pilot valves are assigned to one pressurizer safety relief valve.

The Sierion is a non-floating pilot valve which functions well with a wide variety of media such as

steam, water, two-phase flows and supercooled water.

THE EUROPEAN EPR SOLUTION

3 VS99 safety valve

3 x 2 Sierion pilot valve with stop valves for

thepilot and control line

3 x 1 DMS (doubled) bleed and feed valve

Pressurizer

Sierion

Pressurizer relief tank

Sierion Sierion SierionSierion Sierion

Stop valves are attached between the main valve and the pilot valves for the impulse line and pilot

line. Only one pilot valves is active at a time, while the other is blocked by the stop valve.

The Sierion pilot valve is set to a defined set pressure. The response of the main valve under this

set pressure is ensured by activation through a double-solenoid valve type DMS. This is a further

variant of the so-called bleed and feed valve for pressure relief during emergency supply.

SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES

TYPE VS99 PILOT OPERATED

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