IMI CCI valves and actuators qualify for nukes

  • January 05, 2015
  • News

January 5, 2015 - IMI CCI control valves and pneumatic actuators have been qualified to the requirements of  ASME QME-1 2007, Qualification of Active Mechanical Equipment used in nuclear power plants, which also incorporates the applicable requirements of IEEE 382, NRC requirements, and ASME Section III. The testing included shaker table, steam, imposed loads and radiation, with compliance with EPRI TR-107322, Air Operated Valve Evaluation also demonstrated. The latest NRC authorised nuclear qualification specifications were used.

The qualification was demonstrated by type testing for the parents and reference equipment and was supported by extensive calculations including Finite Element Analysis. It has been independently reviewed for valves shipped to multiple sites.

Valve sizes up to 20 inch (500 mm) and larger are now qualified. These valves include trim options that allow the unique characterisation that modifies flow versus stroke for all applications. Noise, cavitation and tight leakage control in both flow directions are additional benefits. 

Actuator sizes up to 400 square inch (0.26 sq. m) under 125 psi (0.86 MPa) pressure with large springs are covered by the qualification, with testing with and without manual override also included. The actuators incorporate double piston designs to accommodate a large range of valve strokes.

The equipment has been qualified to six g’s in all three directions for seismic events and vibration for a 60-year life. Radiation includes design basis accident conditions up to 5 million rads. Mechanical aging included 3500 full cycle and more than 100,000 partial stroke operations. Thermal means were employed to accelerate aging of non-metallic components to an age of five years. The humidity level was to 100 per ent.

IMI CCI is a recognised world leader in supply of specialized products and services for commercial nuclear power. IMI CCI’s innovative flow control technologies have revolutionised high energy and severe service valve applications, extending service life and improving plant performance. IMI CCI design breakthroughs include the introduction of DRAG technology with advanced flow exit velocity control that has become the industry standard for many applications including main feedwater control, pump recirculation, power operated main steam atmospheric relief and other demanding process control applications.

About IMI Critical Engineering

Part of IMI plc, IMI Critical Engineering is a world-leading provider of critical flow control solutions which enable vital energy and process industries to operate safely, cleanly, reliably and more efficiently. Employing more than 4,000 people, the company operates a global service network with 12 manufacturing facilities worldwide. It draws on extensive technical knowledge, engineering design capability and application experience to create custom-designed products  offering unrivalled durability, safety and performance.


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