Overview of TFTR D&D Hazards Jerry Levine Head, Environment, Safety & Health

Overview of TFTR D&D Hazards Radiological –Tritium Airborne tritium in torus vacuum vessel. Contaminated components. Controls include job pre-planning, Radiation Work Permits (RWPs), Health Physics job coverage, localized ventilation, air and surface tritium sampling, personal protective equipment (PPE), dosimetry, protective covers on breakable vacuum vessel appendages.

Overview of TFTR D&D Hazards Radiological –Direct Radiation Activation products (e.g., Co-60, Fe-55) in tokamak components from D-T neutrons. Controls include job pre-planning, RWPs, Health Physics job coverage, dosimetry. PPPL administrative control limits are 1,000 mrem/yr and 600 mrem/quarter.

Overview of TFTR D&D Hazards Radiological –Activated Particulates Will be produced during diamond wire cutting (DWC) of torus vacuum vessel. Controls include job pre-planning, RWPs, Health Physics job coverage, DWC enclosure with ventilation to exhaust stack through HEPA filters, PPE, dosimetry.

Overview of TFTR D&D Hazards Industrial –Use of Equipment/Tools for Dismantling Operations Includes hand held cutters, band saws, impact wrenches, drills, hydraulic hammers and cutting tools, floor planer, etc. Controls include job pre-planning, work permits, job hazards analyses, training, procedures, oversight by construction safety and industrial hygiene professionals, PPE.

Overview of TFTR D&D Hazards Industrial –Slips/Trips/Falls/Cuts/Strains TFTR Test Cell is a “construction site”. Some work occurs at elevated locations. Removals have left some residual items protruding from the floor. Controls include job pre-planning, work permits, job hazards analyses, training, procedures, oversight by construction safety and industrial hygiene professionals, PPE, covering of protruding items with soft, easily seen barriers.

Overview of TFTR D&D Hazards Industrial –Electrical D&D requires removals of numerous cables, electrical panels, etc. Potential shock or arc hazards present. Controls include removal procedures requiring deenergization of all associated electrical components, “zero-energy checks” prior to removal of components, training, PPE.

Overview of TFTR D&D Hazards Industrial –Potential Heavy Lift Failures Potential failure of weight bearing support during diamond wire cutting or vacuum vessel/TF coil segment lift. Controls include redundant design of load fixtures, safety factors in designs of supports and rigging components, personnel access restrictions.

Overview of TFTR D&D Hazards Industrial –Projectiles Break in diamond wire could cause beads to become projectiles. DWC enclosure is designed and prototyped to contain bead projectiles.

Overview of TFTR D&D Hazards Industrial –Oxygen Deficient Spaces DWC enclosure has the potential to become an oxygen deficient space if liquid nitrogen coolant leak occurs. Controls include exclusion of all personnel from enclosure during DWC operation, treatment of enclosure as permit-required confined space (confined space permit and training required for entry), and oxygen monitoring of the enclosure.

Overview of TFTR D&D Hazards Hazards associated with the TFTR D&D Project have been identified and evaluated, and controls have been implemented to protect workers from these hazards.