Stoppers for steam generator replacementStoppers for steam generator replacement

Stoppers for steam generator replacement - RGV

When the power produced by a pressurized water reactor proves to be insufficient, it may be necessary to replace the reactor’s steam generators. For this very reason, Pronal has designed stoppers for steam generator replacement. Therefore they have the role of plugging the primary pipes.

Biological protection measures can be implemented and the tips of pipes can now be safely decontaminated during steam generator replacement. These inflatable stoppers ensure that chemical solutions are contained during the oxidation-reduction phases of the primary pipes’ decontamination procedure. Temperatures will reach 98°C.

Inflated by water to a pressure of 6 bar, they are capable of withstanding the pressure and the decontamination solution that may be employed (EMMA, EMMAC, LOMI, CANDECON & CITROX).

These hydraulic stoppers have been designed for the 29″ and 31″ primary pipes, corresponding to the hot and cold branches.

Our stoppers are in full compliance with the ALARA principle.



  • One-piece product, autoclave vulcanisation
  • Tailor-made production


  • PMUC material
  • High quality
  • Highly resistant to chemical products and temperatures


  • Ease of use
  • Multi-use

Detailed information

  • Materials: NBR and PMUC
  • Inflation: air & water
  • Temperature resistance: -20°C / +100°C
  • Max. inflation pressure: 7 bar
  • Max. back-pressure: 2 bar
  • Stainless steel accessories

You can not find your dimensions

Our design department employs the best project leaders and designers and will be pleased to develop and create a tailor-made product specially for your unique project.


Composition / Advice

Storage advice
Store in its original aluminium case away from light, damp, and temperature variations.
Installation advice
Training courses may be provided on request

Standards / regulations

In accordance with the conditions of the Pronal guarantee
Please contact us


Fact Sheets / Business Guides
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