Mainstream Commercial Diving

Nuclear Diving Services

MCDI provides routine maintenance, inspection, and repairs for nuclear power companies. Our Charleston, South Carolina office has been providing safe diving services to the commercial nuclear power generation industry since the early 1980’s.  Our routine non-Radiological Control Area (RCA) work has included intake bay inspections, removal of shell and sediment from the cooling system, intake and discharge stop log and valve repairs, and traveling water screen replacement.  RCA work at many nuclear plants has included spent fuel rack removal and replacements, routine pre-outage fuel transfer system preventive maintenance as well as emergency repairs during fuel handling. 

We maintain an extensive inventory of nuclear specific diving equipment. Mainstream’s dive personnel also have unescorted access to many nuclear power plants.  Company procedures have been developed specific to the dressing out and decontamination of the diver to keep “As Low As Reasonably Achievable” (ALARA) and significantly reduce equipment replacement cost. 

Preventive maintenance services to the fuel transfer system have included:

  • Wheel and bushing inspections and replacement
  • Bridge crane mast and grapple inspection and replacement
  • Fuel transfer tube isolation valve replacement
  • Removal of entire original equipment fuel transfer system and replace with upgraded equipment

Our emergency services include:

  • Assist with rigging a damaged dry cask lifting fixture
  • Upender and transfer cart repairs
  • Shear pin and cable replacement
  • Hydraulic cylinder replacement
  • Sheave and wheel replacement
  • Rail repair and alignment
  • Limit switch replacement
  • Repair of derailed transfer cart
  • Upper internal lift rig repair and engagement assistance
  • Assist with FME recovery