Overview of TFTR D

1

• Overview of TFTR DD Hazards

Jerry Levine Head, Environment, Safety Health
2

• Overview of TFTR DD 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.

3

• Overview of TFTR DD 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.

4

• Overview of TFTR DD 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.

5

• Overview of TFTR DD 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.

6

• Overview of TFTR DD 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.

7

• Overview of TFTR DD Hazards
• Industrial
• Electrical
• DD 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.

8

• Overview of TFTR DD 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.

9

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

10

• Overview of TFTR DD 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.

11

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