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Dismantling LEP and the Experiments

Dismantling LEP and the Experiments. Access to the underground areas, project organisation, coordination and safety. The Objective. Empty the tunnel and the experimental caverns safely efficiently in a short time. Some numbers. Tens of thousands of components

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Dismantling LEP and the Experiments

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  1. Dismantling LEP and the Experiments Access to the underground areas, project organisation, coordination and safety

  2. The Objective • Empty the tunnel and the experimental caverns • safely • efficiently • in a short time

  3. Some numbers • Tens of thousands of components • 30,000 tonnes of equipment in the machine plus 10,000 tonnes in the experiments • Almost 50% of the machine to remove before Christmas 2000

  4. What is the timescale? 2 Oct 2000 LEP dismantling LEP physics LHC CE 1 Mar 2002 IP 2 L3 dismantling LEP physics LHC CE 1 June 2001 IP 4 ALEPH dismantling LHC CE LEP physics 15 July 2001 IP 6 OPAL dismantling LHC CE LEP physics 1 April 2001 IP 8 DELPHI dismantling LHC CE LEP physics 1 June 2001 ON THE LHC CRITICAL PATH

  5. Several hundred people • Who is involved? • CERN personnel • Contract staff • Visiting experimental teams • Laboratory  Construction site • New safety issues • Some new major constraints

  6. Installation Nucléaire de Base (INB) • What is it ? • Why did CERN sign ? • How radioactive are LEP and the experiments ? • LEP: Low induced radioactivity(Très Faiblement Actif - TFA ) • Experiments: only the calibration sources are radioactive ( TFA )

  7. INB:What does it mean for the dismantling ? • CERN and the French authorities have agreed procedures and rules • zoning, traceability and waste management ... • These must be explained to everybody involved in this project • They must be strictly followed

  8. INB: Radiological Zoning Procedure • the process of identification of the radioactive elements, based on the original design, calculations and operational experience

  9. Luminosity monitors LEP LEP Very small activities expected TFA TFA But: Many weak radioactive calibration sources inside the detectors! - hence the requirement to wear a film badge and electronic dosimeter at all times. • Zoning of the Experiments Conventional

  10. Zoning of LEP

  11. CONTROLLED ZONE RADIATION D < 25 µSv/h OR D > 25 µSv/h AREA CONTROLEE WEAR YOUR FILM BADGE PORTER VOTRE RP NUCLEAR ZONES • Wearing a film badge and an electronic dosimeter is obligatory for all personnel working on equipment classified as TFA ( slightly radioactive). Areas containing TFA materials will be clearly marked Here is a schematic example of such an area

  12. INB: Practical Implications forthe LEP machine • Traceability of all material • label equipment and containers with barcodes • record movements and measurements • in the tunnel • at the surface • at the storage/transit areas • during storage • when the equipment leaves CERN • Systematic radiation checks

  13. INB: Practical implications forthe experiments • Material disposal • Only TFA material treated like LEP material (traceability) • But all material undergoes systematic radioactivity tests

  14. Monitors • 1 RP technician / experiment (8 h/day) • 1 RP technician + 1 tracer / pit (8 h/day) • 1 tracer per site (dispatcher at surface) (8 h/day) • 1 RP technician + 2 tracers in the transit zone (8 h/day) • 1 mobile team composed of 1RP technician + 1 tracer (8 h/day) • 1 Site watchman / pit (24 h/day)

  15. PASSAGE MATERIALSTRICTEMENT INTERDITPASSAGE OF EQUIPMENTSTRICTLY FORBIDDEN • Constraints Concerning the Equipment • Removal restricted toMon -Fri, 8-12 h and 13-17 h • Transfer of equipment between the experiments and the LEP tunnel is strictly prohibited. • Consequently, access to the caverns andtunnel is restricted to Mon-Fri, 7-19 h

  16. How it affects you • Access • Access card with UX / U clearance- issued after attending this briefing • Safety • Helmet, safety shoes, gas mask, film badge, safety zone • On-site team briefings TARGET: ZERO ACCIDENTS

  17. Respect the Rules - and encourage others to, as well • Violation of rules may lead to • Halting the dismantling • Halting the physics programme • Serious damage of CERN’s reputation

  18. Important Phone Numbers • Fire brigade Urgent : • use a red telephone • from a CERN telephone: 112 • from a mobile phone:+41 22 76 74444 • Fire brigade (non-urgent): 74444 • Technical Services problems • Contact the Site Manager or • Tech. Contr. Room: 72201

  19. On LEP Dismantling Project • Project leader: John Poole • WEB page: http://cern.ch/lep-dismantling Ask your Supervisor / Team Leader

  20. On Experiments Dismantling • WEB page: http://www.cern.ch/exp-dismantling/info.htm • Co-ordinator: Christian Joram, 78909, 160414 Ask your Supervisor / Team Leaderor the GLIMOS

  21. CERN's FUTURE

  22. Good luck to everyone !

  23. LEP TUNNEL – Dismantling Area Follow the rules concerning access and removal of equipment You must hold a valid access card and wear a film badge in the areas indicated Personnel Access between : 7h00 – 19h00 Equipment removal between: 8h00 – 12h00 & 13h00 – 17h00 Radiation measurements and Traceability compulsory for all equipment No visitors Transport of equipment between the machine tunnel and the experiments strictly forbidden Safety helmets and safety shoes compulsory No smoking No litter – keep the areas clean Beware of heavy handling machinery Accident – Fire : Tel. 112 or RED Telephone or 74444. Tech nical Services Breakdown: Tel. 72201

  24. DELPHI - Dismantling Worksite Respect conditions of access and material removal Access card and film badge compulsory Working hours for personnel: 7h00-19h00 Removal of material: 8h00 - 12h00, 13h00 - 17h00 Compulsory control of radioactivity of materials Safety helmet and Safety shoes compulsory No smoking - Keep clear and tidy Beware of handling gear operations and transport vehicles: Keep clear Do not pass under the handling shaft Visits forbidden ------------------------------------------------Accident, Fire: Telephone 112 or Red Telephone or 74444 Breakdown Service: Telephone 72201 GLIMOS 160626

  25. TRACEABILITY Start 2 Oct. 2000 On the surface Dispatcher Somewherein the tunnel Cables At the bottom of the shafts Container Transport Dismantler TIS/RP Tracer Barcode Hand written label(Type, half cell) R.Billen SL/MR

  26. CERN Distribution of materials from the INB ISR 879 … LHC TT10 … CERN For re-use LEP Pits Transit Zone RADIATION GATE MONITOR CERN PM15 PM18 PX24 PM25 PM45 PM65 PM85 For sale/scrap Recycling, Institutes, labs, … Weighing TIS/RP Zone (ISR) Radioactive waste R. Billen SL/MR/DBS

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