SN3 D&D Capabilities
SN3 safely performs D&D by selecting the lowest risk, cost effective approaches considering worker safety, contamination control and various strategies for the minimization, packaging, transportation, and disposal of waste. We have performed D&D related projects for the DOE and its contractors at the Idaho National Laboratory, Hanford Site, Savannah River Site, Nevada National Security Site (NNSS), Portsmouth and Paducah sites, Oak Ridge, Pantex, and for the Office of Legacy Management. We have also supported D&D project execution for Newport News Shipbuilding.
Decontamination & Decommissioning:
In supporting D&D activities at the Paducah Gaseous Diffusion Plant, our staff was fully integrated into project operations, and passed 3 million safe work hours without a lost-time accident. Our D&D experience includes extensive project management and front-line management experience, including managing all waste characterization, packaging operations, transportation, on-site waste acceptance, database tracking, and operation of the on-site landfill.
Associated with our D&D projects, SN3 has managed a variety of waste streams, including; mixed and low-level radioactive waste, asbestos containing material, PCBs, used oil, and mercury containing items.
Notable D&D projects include:
Paducah Gaseous Diffusion Plant (KY).
As an integrated subcontractor of LATA Kentucky, SN3 completed multiple D&D projects at the Paducah Gaseous Diffusion Plant. These included the 21,000 ft2 East End Smelter (completed 1 year ahead of schedule and $10M under budget) and the 200,000 ft2, nine-building Old Feed Plant, which was used to manufacture uranium hexafluoride and fluorine and the the 65,000 ft2 Metals Plant (Buildings C-410/420). In the execution of these projects we managed a variety of waste streams, including; mixed and low-level radioactive waste, asbestos containing material, and PCBs. During this physically intensive work, and working while working many hours in level C PPE, SN3 crews worked over 1,000,000 man hours without a lost-time accident.
Nevada National Security Site (NNSS).
We performed the D&D of many site structures, among them the 20,000 ft2 Pluto Facility and the Super Kukla Test Reactor. Work performance included use of Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) methods for characterization and final site survey. For Pluto, our crews performed characterization and safe removal of wastes, including the removal and recycle of 90,000 pounds of non-contaminated material.
Savannah River Site (SRS).
Built in 1959, the Heavy Water Components Test Reactor (HWCTR) and its 75-foot-tall dome were designed to test experimental fuel assemblies for commercial heavy-water power reactors. The reactor went into inactive status in 1964 after the United States chose to use other types of reactors for commercial power generation. In 2011, SN3, as a management partner in Savannah River Nuclear Solutions, supported the D&D of the facility which included the removal of the 220,000-pound reactor vessel and its 174,000-pound dome; removal of two, 41,600-pound steam generators; and filling the below-grade portion of the reactor with approximately 5,000 cubic yards of grout. A 660-ton crane was used for these critical lift and SN3 provided engineering expertise to develop the lifting beam, rigging, lug design, and removal methodology.