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Leakages of stainless steel pool liners like spent fuel pools (SFP) or any other permanent with water filled tanks can be caused by several reasons: mechanical impact, mechanical or heat stress, weld failure and corrosion. Long-time experience proves that corrosion is the main reason for leakages, especially stress corrosion cracking (SCC). Usually, SCC occurs near the welding line in the heat affected zone.

To seal leakages of stainless steel pool liners like spent fuel pools, or as a preventive measure, AREVA NP deploys its EP UW Process.
It was specially designed to meet the requirements for undrainable stainless steel pools and tanks in the nuclear industry. Regardless of the origin of the leak, the so-called “sandwich technology” is used to seal leakages with epoxy adhesive. A cover plate prevents the liner and the bonding material from mechanical damage.

Your benefits

  • Cost- and time-effective repair method, compared to welding repair
  • Sophisticated areas with limited access in high radiation areas can be repaired
  • Adaptation to a wide variety of possible application areas due to the use of a flexible and extendable manipulator system
  • Product has been approved by European and Japanese authorities
  • Existing material structure is not affected by the repair


For more than 25 years of global field application no leakage of a repaired area has been reported.

Interested in Underwater Leak Mitigation of SFP Liners and Undrainable Tanks?

AREVA NP Germany