Civil Nuclear Valves

RADUR GLOBE VALVE

Quick dismantling globe valves RADUR were specifically designed on the request of the nuclear industry maintenance services in order to comply with the safety and security requirements, to reduce the maintenance time and cost and decrease the radioactive dose level.

The design is based on ALARA principle and helps our customers to comply with the provisions of the Sustainable Development Charter. These valves are EDF qualified and are designed and manufactured according to RCC-M or ASME III standards. All these valves comply with ESPN regulation.

MAIN FEATURES:

• Modular maintenance valve:
  • The body is a part of the piping and doesn’t need any maintenance. It is guaranteed for all the lifetime of the nuclear power plant (60 years).
  • The head itself is a sub-assembly and gathers all parts subject to wear: seat, disc, stem, packing and bellows.
  • The seat is a part of a cage linked to the head. A graphite body/cover gasket or elastomer body/cover o-ring guarantees the tightness between the body and the cage.
• Cobalt free:
  • Cobalt free valve since 1995

QUALIFICATIONS:

Cycling under pressure, thermal shocks, earthquake, high energy line break (HELB), irradiation, LOCA, K1, K2, K3 qualification,…

REFERENCES:

Several thousands of these valves are installed in Nuclear Power Plants on primary, secondary or auxiliary systems since 1996.

CHECK VALVE REGULAR OR CADUR

We design and manufacture a Regular or CADUR type check valves. A quick dismantling CADUR check valve is a check valve with cage. It was specifically designed on the request of the nuclear industry maintenance services in order to comply with the safety and security requirements, to reduce the maintenance time and cost and decrease the radioactive dose level.

The design is based on ALARA principle and helps our customers to comply with the provisions of the Sustainable Development Charter. These valves are EDF qualified and are designed and manufactured according to RCC-M or ASME III standards. All these valves comply with ESPN regulation.

MAIN FEATURES:

• Modular maintenance valve:
  • The body is a part of the piping and doesn’t need any maintenance. It is guaranteed for all the lifetime of the nuclear power plant (60 years).
  • The head itself is a sub-assembly and gathers all parts subject to wear: seat, disc.
  • The seat is a part of a cage linked to the head. A graphite body/cover gasket or elastomer body/cover o-ring guarantees the tightness between the body and the cage.
• Cobalt free:
  • Cobalt free valve since 1995.

QUALIFICATIONS:

Cycling under pressure, thermal shocks, earthquake, irradiation, radioactive contaminated water with particles (RCW), opening and tightness at low Delta-P, containment isolation,…

REFERENCES:

Several thousands of these valves are installed on primary, secondary or auxiliary systems since the construction of the first French nuclear power plants.

INSTRUMENTATION VALVE AND MANIFOLD REGULAR OR RADUR

SEGAULT instrumentation valves and manifolds were developed for nuclear power plants with the purpose to:

• Reduce the weight and overall dimensions
• Reduce the radioactive dose level (no stellite and limitation of retention areas)
• Facilitate the maintenance with the development of RADUR range instrumentation valves

Our high pressure instrumentation valves and manifolds meet long life, low weight, physical and chemical resistance and safety requirements. SEGAULT designs and manufactures a Regular or RADUR (Modular Maintenance) type instrumentation valves. These valves are EDF qualified and are designed and manufactured according to RCC-M or ASME III standards. All the valves comply with ESPN regulation.

MAIN FEATURES:

• Modular maintenance valve:
  • The body is a part of the piping and doesn’t need any maintenance. It is guaranteed for all the lifetime of the nuclear power plant (60 years).
  • The head itself is a sub-assembly and gathers all parts subject to wear: seat, disc, stem, packing and bellows.
  • The seat is a part of a cage linked to the head. A graphite body/cover gasket or elastomer body/cover o-ring guarantees the tightness between the body and the cage.
• Cobalt free:
  • Cobalt free valve since 1995.

QUALIFICATIONS:

Cycling under pressure, thermal shocks, earthquake, irradiation, …

REFERENCES:

Several thousands of these valves are installed in nuclear power plants since 1996.

SELF STABILIZING SAFETY RELIEF VALVE

Self-stabilizing safety relief valve is a SEGAULT patented technology. Initially the self-stabilizing safety relief valves were developed for French nuclear sub-marines and are installed on the pressurizers of the Charles de Gaulle aircraft carrier and SNLE-NG and BARRACUDA sub-marines.

These valves are EDF qualified and are designed and manufactured according to RCC-M and ASME III standards. All the valves comply with ESPN regulation.

MAIN FEATURES:

Self-stabilizing safety relief valve has a specific geometry which provides:

• High functional stability
• Opening and closing with no vibration and no dribbling
• Blow-down starting from 5%
• Ability to exhaust gas, liquid, or even both
• Influence of parameters and conformation of the circuit on behavior drastically limited.

QUALIFICATIONS:

Numerous qualifications and stability tests with complete open / close cycles under pressure for each type of application

REFERENCES:

More than 20 years of experience with applications such as the pressurizers of all French nuclear sub-marines, pressurizers of the Charles de Gaulle aircraft carrier, pressurizer of CEA reactors (French Atomic Energy Commission). Supply of our safety relief valves to TEG, TEP, RRA, RCV, RIS,… systems of French 900MW, 1300MW and 1450MW nuclear power plants.

SOLENOID VALVES

Since 1962 SEGAULT manufactures all nuclear steam supply system (NSSS) solenoid valves of the French nuclear sub-marines and the French nuclear aircraft carrier Charles de Gaulle. Company’s experience in navy applications has allowed to develop a large range of solenoid valves for civil nuclear power plants. The solenoid valves have the following advantages comparing to electrically motorized valves:

• Reduced weight and overall dimensions
• Seismic resistance with no supporting
• High cycling (100 000 cycles)
• Quick opening or closing (less than one second)

The valves EDF qualified and are manufactured according to RCC-M or ASME III standards. All the valves comply with ESPN regulation.

MAIN FEATURES:

The design of SEGAULT solenoid valves emphasizes the simplicity, minimum of moving parts and maximum resistance to contamination.

Balanced disc authorizes function of the valve under various conditions of differential pressure, reduces the size and weight of the coil, thus bringing the center of gravity closer to the pipe line.

QUALIFICATIONS:

Cycling under pressure, irradiation, earthquake, LOCA, K1, K2 and K3 qualification

REFERENCES:

More than 50 years of experience in various applications such as « pressurize spray » and operations on hydrogenation and primary and secondary systems of PWR.