NSSI was established in 1971 as a manufacturer of radioactive tracer materials and radioactive sealed sources. In conjunction with these manufacturing services, NSSI offered additional services and products including chemical and radioactive decontamination, leak testing, radiation instrument calibration, radiation safety training, and waste disposal. Waste disposal activities have grown to encompass the treatment, storage, and disposal of radioactive, hazardous and non-hazardous, and mixed radioactive/hazardous wastes.
The NSSI facility occupies approximately 5 acres in a light industrial area of Southeast Houston. Waste treatment, storage, and disposal activities are currently the primary activity of the NSSI facility. NSSI receives wastes from a variety of offsite generators, treats the waste, and ships the residues to permitted offsite facilities for final disposal.
NSSI has been licensed to possess and use radioactive materials and process radioactive waste since 1971. NSSI obtained its final part B permit for hazardous, non-hazardous, and mixed wastes on October 4, 1990.
NSSI facilities are state of the art facilities designed specifically for waste storage and treatment. Storage facilities include over 40,000 square feet of covered, high integrity epoxy coated concrete berm areas with an approved storage capacity of up to 4,000 drums.
NSSI's 13 bulk liquid stainless steel storage tanks allow storage and treatment in excess of 55,000 gallons of waste liquids. All permitted tanks are contained within high integrity epoxy coated concrete bermed areas under roof.
Treatment facilities include an acid/base neutralization tank, slow speed mechanical shear shredder, glass-lined Pfaudler reactors for oxidation/reduction reactions, a vacuum distillation unit, a dry waste compactor, stabilization system, and a continuous Mercury retort.
Equipment is configured as needed to provide single-stage and multi-stage waste treatment systems.
The facility disposes of all solid and liquid effluents from the facility, with the exception of sanitary sewer wastes, as manifested waste to offsite permitted hazardous and non-hazardous, incineration and land disposal facilities.
NSSI is a fully permitted RCRA Part B hazardous waste TSDF and one of only three facilities in the United States providing storage and treatment of mixed hazardous/radioactive wastes. The facility receives waste from generators in all states and from foreign sources. The NSSI facility is permitted to accept all radionuclide including special nuclear material and a full spectrum of EPA waste codes.
In Texas, radioactive wastes as well as hazardous and mixed(hazardous and radioactive) wastes are regulated by the Texas Commission for Environmental Quality (TCEQ). NSSI is permitted to receive and manage hazardous wastes, non-hazardous wastes, radioactive wastes, and mixed wastes.