Underwater Construction Corporation (UCC) is the most experienced and qualified nuclear underwater welding company in the industry. We have performed over 100 underwater welding projects on various components of the reactor, and in the reactor vessel itself. We are currently the only company to have qualified and performed an underwater safety related weld. UCC currently has over 30 qualified nuclear underwater welders on staff.
UCC’s underwater hyperbaric welding facility in Essex, Connecticut is the largest of its kind. The hyperbaric tank was designed exclusively for the nuclear underwater welding industry and can achieve a simulated depth of 95 feet of water. The tank is 12 feet in diameter and 18 feet high. The tank is equipped with a access hatch large enough for mock-up section to pass through for assembly inside the tank. It is also equipped with a 24" view port so supervision, customer, and Quality Control personnel can closely monitor the divers activities.
UCC has qualified several underwater welding procedures. These procedures are qualified in accordance with ASME Section IX , ASME Section XI Code Case N-516 and AWS D3.6 type "B". The ASME procedures are qualified for all position groove welds on stainless steel plate and pipe in water depths up to and over 45 feet of water.
Our safety-related procedures were originally developed for Core Spray Tee Box modifications in BWR reactors. However, we have since performed safety-related welding on several other safety related components such as suction breakers in spent fuel pools and seismic support braces in suppression chambers. Below is a list of some typical nuclear welding projects which UCC has performed. For a more complete list please refer to the attached Competed Welding Projects List.
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