Babcock Nuclear Valves

Nuclear valve testing process

Babcock Valves has developed a wide range of safety related valves for nuclear purposes, and provides full aftermarket support to its  customers. Our valves are manufactured exclusively at our facilities in the Basque County, one of the most developed industrial areas of Europe.

Nuclear certified valves are always served after non destructive testing, including radiography, ultrasonic, hydraulic and seismic testing, among others, and are served with environmental qualification certifications, ensuring strict adherence to applicable nuclear codes and standards, and aftermarket assistance, supply and support.

We know you can take no chances with safety, so we don´t take risks with quality or design. Our manufacturing processes and materials meet the highest standards of industry and our designs are highly conservative, using only models widely tested on other industries, that has shown very high flow efficiency, and an extraordinary resistance in our stress analysis, before being adapted to nuclear standards.


Our valves are manufactured according to ASME section III and ANSI B16.34, including standards for:

  • Minimum wall thickness
  • Body and bonnet according to ASME and ASTM standards.
  • Non destructive examinations.
  • Hidrostatic shell and hydrostatic-pneumatic seat tightness testing.


  • ASME Boiler and Pressure Vessel Code Section III
  • ASME Nuclear Code Cases: Nuclear Components
  • ASME B 16.34 (Valves)
  • ASME QME-1 (Qualification)
  • ASME B 16.41 (Functional Qualification)
  • RCC-M (Design and Construction Rules for Mechanical Components of PWR Nuclear Islands


  • Main steam isolation valves
  • Feed water isolation valves
  • Bellow sealed valves for primary and secondary circuits
  • Frozen sealed valves for sodium services.
Main Steam Isolation Valves

Pipe reaction end-loadibng test


  • Design & seismic calculation
  • Design & seismic calculation by finite elements
  • Pretest inspection
  • Fundamental frequency determination
  • Cold cycle test
  • Hot cycle test
  • Intermediate inspection after cold & hot cycle
  • Pipe reaction end-loading test
  • Seismic test
  • Post-test inspection
Main Steam Isolation Valves

hot cycle test


  • Receipt & Inspection
  • Baseline Functional Test
  • Thermal Aging
  • Post-Thermal Aging Functional Test
  • Mechanical Cycle Aging
  • Mechanical Cycle Aging Functional Test
  • Radiation Aging
  • Post-Radiation Aging Functional Test
  • Seismic Baseline Functional Test
  • Vibration Aging Test
  • Post-Vibration Aging Functional Test
  • OBE Sine Sweep Tests
  • OBE and SSE Random Multi-frequency Tests
  • Post-Seismic Functional Test
  • Accident Simulation Test (LOCA)
  • Post-Accident Functional Test
  • Final test inspection to identify any evidence of damage or distress