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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.
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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.
