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LST SAFETY

This report details safety issues related to seismic, fire, electrical, and environmental concerns at SLAC, including combustibility of LST material, fire safety ratings, gas mixture composition, electrical safety measures like high voltage protection, and environmental permitting.

frederickmitchell
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LST SAFETY

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  1. LST SAFETY FRANK O’NEILL (SLAC) 10/21/03

  2. SAFETY ISSUES • Seismic • Fire • Electrical • Environmental

  3. SIESMIC SAFETY • ~10,000 kg of brass per sextant. • Approval from Earthquake Safety Committee 10/17/03

  4. FIRE SAFETY ISSUES • Combustibility of LST material • Flammable Component of Gas Mixture • Wire and Cable Fire Safety Rating

  5. LST MATERIAL COMBUSTABILITY • LST extrusion is constructed of plastic (PVC) • Rated Class V-0 in accordance with UL-94 (Tests of Flammability of Plastic Materials) • Loaded with 20% Calcium Carbonate This provides the PVC with some fire retardant properties • Small scale laboratory fire tests were conducted by Hughes Associates • ASTM E-1354 “cone calorimeter” test • Comparison of RPC and LST samples

  6. Comparison of LST and RPC

  7. TEST RESULTS • The PVC material exhibited significantly better ignitability and heat release rate characteristics than the existing RPC material • The PVC has a strong tendency to intumesce resulting in an insulating layer that inhibits flame spread

  8. GAS MIXTURE • 3 components: Argon, Isobutane, and CO2 • Similar Gas Mixtures utilized on other Detectors • SLD: 2.5% Ar, 9.5% isobutane, 88% CO2 • ZEUS: 3% Ar, 8% isobutane, 89% CO2 • Final decision on mixture pending • Nonflammable mixture will be utilized • Hughes Associates providing consulting services for evaluation of mixtures

  9. Wire and Cable Fire Safety • High Voltage Cable meets the CERN, Safety Instruction 23 • Signal Cables meet the IEC 331-1 (Flame and Fire Propagation Test)

  10. Electrical Safety • High Voltage • Passive over-current protection in power supplies • ~5500 Volts and ~1 nF a ~15 mJ. • Startle hazard • Low voltage • Read-out electronics in VME crates • Usual precautions such as fusing

  11. ENVIRONMENTAL SAFETY • Bay Area Air Quality Management District (BAAQMD) issues SLAC a permit for discharge of VOCs • SLAC may need to modify the permit • Coordination with the SLAC Environmental Protection Department is ongoing

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