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Electrical Safety for the interventions during Hardware Commissioning of LHC

This document reviews the procedures and protocols for ensuring electrical safety during the Hardware Commissioning process at the Large Hadron Collider (LHC). It covers the strict adherence to safety regulations and codes, identification of electrical risks, authorization processes for interventions, and the effective management of electrical safety subsectors. The text outlines specific procedures, roles, and steps taken to prevent electrical hazards and ensure a safe commissioning environment.

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Electrical Safety for the interventions during Hardware Commissioning of LHC

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  1. Electrical Safety for the interventions during Hardware Commissioning of LHC Anne Funken, TS-ICC Review of Sector 45 - 28th of February 2008

  2. Contents • The procedures in matter of electrical safety • The Electrical Safety Subsectors • How is electrical safety managed ? • How do we proceed to authorise an intervention ? • What could be improved for the next sectors ? Review of Sector 45 - 28th of February 2008

  3. The procedures in matter of electrical safety The CERN safety regulation shall be strictly followed, more particularly the Electrical Safety Code C1 which stipulates to follow the instructions of the UTE C 18-510 • General procedure, EDMS 885122 : • Identification of the voltage sources and the electrical risks generated • Status of the voltage sources during the different phases of HC • The UTE C 18-510 applied to HC : consignation in two steps, who does what ? • The documents required (Yellow papers) • Specific procedures per type of intervention : • Présentation des câbles DC sur les amenées de courant, EDMS 885123 • Première connexion des câbles DC sur les amenées de courant des DFBs après la qualification des circuits à froid, EDMS 887589 • Identification of the person assuming each role : who is whom ? • The different steps and documents issued • Procedure for the disconnection of the warm parts of SC circuits, EDMS 762293 : • Extension of the UTE 18-510 required for the superconducting circuits • Zero current measurement to be done in the 2nd step of consignation Review of Sector 45 - 28th of February 2008

  4. Electrical Safety Subsectors (Source : Matteo Solfaroli) • Definition : An Electrical Safety Subsector is a cryogenic section electrically isolated from the rest of the machine. In some cases, two to three Electrical Safety Subsectors belong to the same Powering Subsector. Review of Sector 45 - 28th of February 2008

  5. Electrical Safety Subsectors • List of the 43 Electrical Safety Subsectors, per sector : * Q5D4 for the electrical safety subsectors ML4.Q5 and MR4.Q5 Review of Sector 45 - 28th of February 2008

  6. Electrical Safety Subsectors • Purpose : • First introduced for the ElQA tests (near miss on the 5th of July 2007) • The concept is extended to authorise other types of interventions e.g. interventions on or close to a DFB. • List of circuits and power converters per Electrical Safety Subsector : • http://hcc.web.cern.ch/hcc/safety_subsec.php. • EDMS 885496 e.g. MR4.Q5 Review of Sector 45 - 28th of February 2008

  7. Electrical Safety : how is it managed ? • For each intervention taking place in an environment where an electrical risk is present, a Chargé de Travaux (CT, habilitation B2) shall be appointed : • For electrical interventions, the CT belongs to the intervention team • For non electrical interventions, the CT belongs to HCC • Since Nov 07, the Chargé de Travaux HCC is Thierry Octave (Norisko) • Management of the 1st steps of consignation requested by HCC and the autorisations de travail given by HCC done via : • Paper folders for the yellow papers • Status files for the follow up, accessible at http://hcc.web.cern.ch/hcc/ Review of Sector 45 - 28th of February 2008

  8. Electrical Safety : how is it managed ? Done by Thierry Octave Summary Detail per sector Review of Sector 45 - 28th of February 2008

  9. Electrical Safety : how is it done ? • Before the powering tests : • All the PC, QHPS and EE systems are consignés in 1st step (requested by HCC). The requests are done by Electrical Safety Subsectors. • The Chargé de Travaux HCC executes the 2nd step of the consignation • The DC cables being not electrically connected to the CL : - The DC cables are short-circuited and grounded (done by HCC) - The CL of the DFBs are short-circuited and grounded (done by ElQA Team) • During the powering tests : • The PC, QHPS and EE are déconsignés according to the test program • Once one circuit of an Electrical Safety Subsector is déconsigné, no intervention is allowed on the same Electrical Safety Subsector • After the powering tests : • All the PC, QHPS and EE systems remain déconsignés • If an intervention is required on an Electrical Safety Subsector, this subsector shall be consigné Review of Sector 45 - 28th of February 2008

  10. Electrical Safety : how is it done ? • When ElQA activities take place on an Electrical Safety Subsector, other interventions are NOT allowed on the same Electrical Safety Subsector. • For non electrical interventions, an autorisation de travail is given by the Chargé de Travaux HCC to the Chef de Chantier of the intervention team. To intervene on a DFB, all the circuits of the corresponding Electrical Safety Subsector are consignés (PC, QHPS, EE). • For electrical interventions, the Chargé de Travaux from the intervention team requests the 1st steps of the consignation he/she deems necessary and executes the 2nd step of the consignation according to the procedures established. Review of Sector 45 - 28th of February 2008

  11. Electrical Safety : improvements Request for an intervention ADI Intervention Team Leader Authorizes on EDH HCC Quadrant Owner Request to issue the Autorisation de travail UTE 18-510 Autorisation de travail UTE 18-510 CT HCC • All requests for intervention shall be addressed to the HCC Quadrant Owner, the autorisation de travail UTE C 18-510 for non electrical intervention is only a consequence: Review of Sector 45 - 28th of February 2008

  12. Avis d’Intervention on EDH ADI Review of Sector 45 - 28th of February 2008

  13. Avis d’Intervention on EDH • What ? • Who ? • Where ? • When ? • VIC ? • Consignation ? • Approved by: - HCC Quadrant Owner - Safety Coordinator - Chargé de Travaux ADI Review of Sector 45 - 28th of February 2008

  14. Electrical Safety : improvements End (2) Intervention Team Leader HCC Quadrant Owner (1) CT HCC • The autorisation de travail UTE C 18-510 shall be returned to the Chargé de Travaux HCC once the intervention is completed. • All requests for intervention shall be addressed to the HCC Quadrant Owner, the autorisation de travail UTE C 18-510 for non electrical intervention is only a consequence: Request for an intervention Authorizes Request to issue the Autorisation de travail UTE 18-510 Autorisation de travail UTE 18-510 Review of Sector 45 - 28th of February 2008

  15. Electrical Safety : improvements • Reactivity assured due to the fact that the Chargé de Travaux HCC was present 5 days a week. From week 8 : two days a week (Tuesday and Thursday) : • The requests for déconsignations or autorisations de travail are to be planned accordingly. • For urgent interventions which could not be planned accordingly : Chargé de Travaux from TS/EL. To be limited. • Further analysis of the electrical risk generated by : • The 60Acircuits and locally powered 80-120A circuits of an Electrical Safety Subsector during an intervention on or close to a DFB of the same Electrical Safety Subsector. • The circuits of a DFBA during an intervention on or close to the DFBA of the same Electrical Safety Subsector, e.g. : DFBAD.6R2 & DFBAE.7L3 of A23. Review of Sector 45 - 28th of February 2008

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