Resolution recently closed:

STATUSDOMAINTASK #TYPEDESCRIPTIONASSIGNEE/ RELATED_TODEADLINEOPENED IN CLOSE COMMENTS
DECISIONCoordination / ScheduleD42-01DECISIONThe SND core-drilling PLAN activity is cancelled.2026-10-23 LS3C #42
DECISIONLogistics / RadioprotectionD41-01DECISIONBE EA and LS3 Coordination: The iron shielding from the CNGS hadron
stopper will not be recovered during LS3. 		2026-10-09 LS3C #41
DECISIONCoordination / ScheduleD39-01DECISIONNew PLAN Activities/Contributions first addressed by PLAN coordinator and then status update announcement at the LS3C2026-09-09 LS3C #39
CLOSEDInfrastructureA39-01ACTIONTo communicate the information regarding the planned shutdown of the central compressed-air production plant at the Meyrin site within their respective groups and to ensure that all installation owners, workshop supervisors and compressed-air users are informed. Report any incompatibility to EN-CV before 9~October 2026 (to A. Fournier and G. Petrika)Groups and Projects2026-09-09 LS3C #39Can be closed > Follow up by CV on LS3C 6.11
CLOSEDSafetyA36-02ACTIONRecirculate the memo on appropriate work clothing during heatwavesLS3 Coordination2026-07-29 LS3C #36
CLOSEDEngineeringA36-04ACTIONPresent the outcome of the ELQA at Warm measurement at the LS3CTE-MPE2026-07-29 LS3C #36
CLOSEDEngineeringA36-05ACTIONPresent the outcome of the Leak Tests at Warm at the LS3CTE-VSC2026-07-29 LS3C #36
CLOSEDSafetyA36-06ACTIONPresent the deployment of ESP in the Injectors at the LS3CESP2026-07-29 LS3C #36Refer to presentation of S. Evrard
An ESP update will be provided at the next LS3 event in May 2027
CLOSEDEngineeringF35-02FOLLOW-UPInvestigation on the “Socket Breakers” trip (Power Converter LHC-4 RF tests)LS3 Coordination2026-07-15 LS3C #35Closed by SY DSO 2026-08-13 No incident or safety issue identified
CLOSEDServices AlarmsF35-04FOLLOW-UPLocation of the SAREP alarm transmission system rack in the ISOLDE HallLS3 coordination2026-07-15 LS3C #35Miriam MUNOZ CODOCEO from EN-AA contacted
Following a review with EN-AA as the equipment responsible, the racks will remain at their current location in the ISOLDE hall because relocation would be complex and no upgrade is planned that would provide an opportunity to transfer this critical system.
CLOSEDCoordination / ScheduleD35-01DECISIONDocument: “Running facilities in LS3” – EDMS No.3463172 V0.2->V1.0 approved with caveat (also to be approval at IEFC). Caveat addressed in further updates.2026-07-15 LS3C #35
CLOSEDCoordination / ScheduleF35-01FOLLOW-UPAET additional requests/measuresLS3 coordination2026-07-15 LS3C #35Follow-up on LS3 coord. à CLOSED
CLOSEDInfrastructureA34-01ACTIONTo inform SCE if specific areas should be included in the round of guards.all groups/projects2026-07-01 LS3C #34If no feedback from Mauro, we close it and announce it at LS3C just to retrigger request
CLOSEDCoordination / ScheduleA34-02ACTIONStatus PLAN ID 14498, 14499 and 14500.LS3 PLAN officers2026-07-01 LS3C #34These activities are being followed up by the PLAN Offices (EN-ACE):
14498 is already approved.
14499 and 14500 are awaiting a contribution validation from EN-THE
CLOSEDCoordination / ScheduleF\_MC-02FOLLOW-UPGo/No-Go awaited on the 10MHz (awaiting ITS in June 2026)LS3-Coordination2026-05-29 LS3C CheckupPresented at IEFC by RF
CLOSEDLogistics / RadioprotectionF\_MC-07FOLLOW-UPShielding – Lack of resources in EA (coordination) and THE (transport) – 5 FTE.years Industrial support are missingBE-EA2026-05-29 LS3C CheckupTo close, referring to report by Sebatsien on shielding blocks (Resources are available)-Normally in the minutes
CLOSEDExperimentsF\_MC-08FOLLOW-UPServices for experiments running during LS3LS3 Coordination2026-05-29 LS3C Checkuphttps://edms.cern.ch/document/3463172/1.0
CLOSEDInfrastructureF\_MC-09FOLLOW-UPStatus NA ChillersEN-CV2026-05-29 LS3C CheckupBeing followed up by LS3 Coordination Team
CLOSEDRadioprotection / SafetyF\_MC-12FOLLOW-UPProcedure on what to do in case of significant increase of collective and individual dose with respect to values approved by the ALARA committee.HSE-RP2026-05-29 LS3C CheckupS. ROESLER – Update on radiation dose alerts and approval processes
CLOSEDCoordination / ScheduleF32-01FOLLOW-UPDeployment of the new “Autorisation Exceptionnelle de Travail” workflowLS3 Coordination2026-07-012026-05-20 LS3C #32Feedback expected deployment on the 2026-07-01 
CLOSEDCoordination / ScheduleF31-01FOLLOW-UPOptimization of TE resources assigned to HL-LHC WP6A (including a report on issues arising in the meantime) and refurbishment of the HIE-ISOLDE cryomodule (CM), with a decision point on the CM1 refurbishment by September 2026.LS3 Coordinationupdate 2026-092026-05-06 LS3C #31Update and decision (if needed) on Sep’26
CLOSEDSafetyF30-03FOLLOW-UPESP status at the start of LS3.LS3 Coordination2026-082026-04-22 LS3C #30An ESP update will be provided at the next LS3 event in May 2027
CLOSEDSafetyF30-02FOLLOW-UPESP: Anticipation of the release by HSE of the roles and responsibilities document, originally targeted for June 2026.HSE / ESP2026-06-032026-04-22 LS3C #30No anticipation of the release 
CLOSEDSafetyA25-01ACTIONESP: Groups should designate a data officer responsible for cleaning and maintaining electrical information in the databasesCEM, EA, GM, AA, CV, HE, EL, ABT, BI, RF, EPC, STI, CRG, VSC, MPE2026-07-012025-11-26 LS3C #25is being reviewed within the ATS Digital Thread Panel
CLOSEDInfrastructureR22-02RECOMMENDATIONTo contact the SCE-SAM LS3 contact persons to complete
the information on PLAN on the topic of civil engineering to be installed during LS3.		ALL2026-11-302025-08-20 LS3C #20Each requester now has a dedicated contact who can follow up and support the processing of their request.
A contact person has been provided by SCE for all new LS3 requests for each experimental area/complex.

Resolution closed at (or before) 2026-06-03 LS3 Committee #33

STATUSDOMAINTASK #TYPEDESCRIPTIONASSIGNEEDEADLINEOPENED IN CLOSE COMMENTS
DECISIONSafetyD26-02DECISIONSPS LSS2: EN-EL is responsible for all necessary lockout procedures required for the removal and installation of cablesSPS LSS2 CoordinationN/A2026-01-14 LS3C #26No comment from the committee
DECISIONCoordination and ScheduleD26-01DECISIONLS3 Committee endorses the mandate of the technical coordinator of the SPS LSS2 activities according to the document EDMS No.3390182SPS LSS2 CoordinationN/A2026-01-14 LS3C #26No comment from the committee
DECISIONCoordination and ScheduleD18-01DECISIONAny new PLAN activity requests must first be presented and appropriately justified at the LS3 Committee meetings.AllUntil new PLAN version2025-05-28 LS3C #18No comment from the committee
DECISIONLogisticsD16-01DECISIONAll new space requests must first be presented and appropriately justified either at the LS3 Committee meetings or during ad-hoc meetings.AllN/A2025-04-30 LS3C #16No comment from the committee
CLOSEDRadioprotection / SafetyR27-01FOLLOW-UPThe RSOs (RSSOs) should, proactively, be in regular contact with the DIMR owners of (possible) L3 interventionsAll groups/ projectsN/A2026-01-14 LS3C #27Closed at the LS3 Mission 2026-05-28
CLOSEDInfrastructureR20-01RECOMMENDATIONOrganise preventive maintenance before LS3 on the building automatic doors for material, to reduce workload during LS3.Projects and Experiments2026-06-302025-06-25 LS3C #20No feedback from the committee
CLOSEDRadioprotection R07-04RECOMMENDATIONContact N. QUINQUIS in case of needs relative to logistical and dismantling operations in controlled radiation areas during LS3.All groups/ projectsN/A2024-07-03 LS3C #7No others major requests expected, any new request shall be addressed individually
CLOSEDRadioprotection / LogisticsR02-02RECOMMENDATIONThe need for transports of bulky and/or highly activated objects or activated items with exotic material composition (e.g. heavy metals) should be announced to RP and EN-HE as soon as possible.Radioactive transportsN/A2024-04-17 LS3C #2Transports of bulky and/or highly activated objects identified
CLOSEDEngineering&IntegrationR02-01RECOMMENDATIONRelevant Projects and Groups must have representatives at the ICL Meetings.All groups/ projectsN/A2024-04-17 LS3C #2Groups and projects are represented at ICL Meetings
CLOSEDRadioprotection / LogisticsF29-02FOLLOW-UPStrategy of temporary storage of radioactive equipment (ABT)SPS LSS2 Coordination2026-04-22 / 2026-05-312026-03-25 LS3C #29Strategy has been presented during LSS2 coordination kick off meeting and during LS3 event, no particular negative feedback or opposition.
CLOSEDRadioprotection / LogisticsA28-04ACTIONOrganise an add-hoc discussion on NA-CONS RWLS3 coordination, RP and NA-CONS2026-06-302026-02-25 LS3C #28Issue managed by the Task Force – Thomas Zickler
CLOSEDRadioprotection / LogisticsA28-03ACTIONAnalyse the RW forecast data related to the peak in Q3-2026LS3 Coordination2026-05-062026-02-25 LS3C #28Issue managed by the Task Force Radioactive Storage – Germana Riddone (EDMS#3447180)
CLOSEDRadioprotection / LogisticsA28-02ACTIONProvide RW forecast data related to the peak in Q3-2026, split by location, group/projectRP-RWM2026-05-062026-02-25 LS3C #28https://edms.cern.ch/document/3447180
CLOSEDLogisticsA27-01ACTIONIdentification of components to be moved from Building 954/955/879RP/Space Management teamClosed 2026-02-25 LS3C #282026-01-14 LS3C #27Managed by Space Management Task Force
CLOSEDCoordination and ScheduleA26-01ACTIONVerify or request the contributions of BI/VSC/ABT/…, particularly regarding the potential need to dismantle equipment for the cabling campaignSPS LSS2 Coordination2026-03-252026-01-14 LS3C #26Contribitions checked and clarified
CLOSEDEngineering&IntegrationA25-02ACTIONRelease the new naming convention SPS-PM-QA-0001 EDMS No.3384371SPS and Transfer Lines stakeholdersClosed 2026-03-25 LS3C #292025-11-26 LS3C #25https://edms.cern.ch/document/3384371
CLOSEDSafetyA22-01ACTIONLAACS/LASS access numbers shall be updated.EN-AAClosed 2026-03-25 LS3C #292025-08-20 LS3C #20Information given to EN-AA for updating the systems: https://adams-intranet.web.cern.ch/peopleinzones.php?where=LHC
CLOSEDCoordination and ScheduleA19-02ACTIONValidate the Assumptions for LS3 schedule LHC-PM-MS-0022 optimisation Slides 8LS3 Coordination2026-05-062025-06-11 LS3C #19Last assumption “Collimator dismantling during warm-up” confirmed at LS3 Mission
CLOSEDSafetyA17-01ACTIONDocument defining roles and responsibilities of the WSS.EN-DSO/HSE2026-02-252025-05-14 LS3C #17https://edms.cern.ch/document/3440507
https://edms.cern.ch/document/3436963
MERGED with F31-01Coordination and ScheduleA30-01ACTIONProvide an update in September 2026 about the progress of HIE ISOLDE CM1 refurbishment vs WP6a activities.TE2026-092026-04-22 LS3C #30Merge with F31-01 No reported at Committee #33
MERGED with F31-01Coordination and ScheduleA31-01ACTIONReview the HIE-ISOLDE PLAN activities 14157 and 14158 by 31st of July 2026.BE-OP and SY-RF2026-07-312026-05-06 LS3C #31
CLOSEDLS3 CommitteeA28-01ACTIONIdentify departments link persons for the “Mission: LS3 checkup” eventTE, BE, EN, SY, SCE and IT department heads2026-04-012026-02-25 LS3C #28No reported at Committee #33
MERGED with A15-02Engineering&IntegrationA10-05ACTIONReview the integration studies/ECRs list to keep it as up to date as possible.All groups/ projectsN/A2024-08-21 LS3C #10

Resolutions closed before the 2025-07-09 LS3C #21:

TASK #DESCRIPTIONASSIGNEEDEADLINEDOMAINSTATUSOPENED IN CLOSED IN
A2-01The activities to be scheduled during the LS3 involving EN-EL for major (de)cabling (i.e. HL-LHC, NA-CONS, PSS-CONS) should be requested at latest on 30th of June 2024. For all other projects and works the deadline is set to 30th of September 2024All groups/ projectsN/AEN/EL CLOSED2024-04-17 LS3C #22024-07-09 LS3C #21
R7-02Anticipate a potential need for (procurement) contract extensions in case of a shift of the start of LS3All groups/ projectsN/ACoordination and ScheduleCLOSED2024-07-03 LS3C #72024-07-09 LS3C #21
A8-01

To communicate the needs for additional dosimeters and training for LS3 to the dosimetry RP service. S. Roesler (HSE-RP) will report on this subject in one

of the upcoming LS3

All groups/ experimentsN/ARadioprotectionOBSOLETE2024-07-24 LS3C #8replaced
A10-04 Review the ECRs for LS3 (i.e. check if anything is missing, incorrect, or incomplete)All groupsN/AECR and IntegrationOBSOLETE2024-08-21 LS3C #102024-07-09 LS3C #21
A14-01Provide the name of the safety person(s) (if not part of
the LS3C members already) to be invited to the safety-dedicated LS3 meeting that will be held in May
2025, before the 31st of March 2025.		ALL groups/ projects2025-03-31Safety coordinationCLOSED2025-02-19 LS3C #142025-04-02 LS3C #15
A14-02Provide or update the space request needs according to the new LS3 schedule. Inform if barracks/bungalows are provided by Contractors or by CERN. Before the 28th of February 2025.ALL groups/ projects2025-02-28Space ManagementCLOSED2025-02-19 LS3C #142025-04-02 LS3C #15
A14-03Submit all requests related to IT cabling (DC-IT) for the LS3 by SNOW ticket before the 31st of March 2025 and create the corresponding PLAN contribution (link the SNOW ticket number). Late requests may be subject to long delays or declined.All groups/ projects2025-03-31 InfrasctructureCLOSED2025-02-19 LS3C #142025-04-02 LS3C #15
A15-03Plan a presentation in a LS3 Committee summer 2025 meeting on the update of the ECRs and integration status.LS3 Scientific secretaries2025-07-31LS3 CommitteeCLOSED2025-04-02 LS3C #152025-07-09 LS3C #21
A9-01To verify the respective 171 PLAN contribution for which EN-EL misses a ticket request as well as the 34 SNOW tickets classified as incomplete tickets by EN-ELAll groups/ projectsN/AEN/EL CLOSED2024-08-07 LS3C #92024-07-09 LS3C #21
A10-02Review the invalidated PLAN contributions related to cable identification, as the YETS 2024-2025 is the final opportunity to address this.All groups/ projectsN/AYETS2024-2025CLOSED2024-08-21 LS3C #102024-07-09 LS3C #21
A10-03Review and finalize the ECRs for YETS 2024-2025.All groupsN/AYETS2024-2025CLOSED2024-08-21 LS3C #102024-07-09 LS3C #21
A12-01Finalization of Experimental Areas ECRs for the YETS 2024-2025All groups concernedN/AYETS2024-2025CLOSED2024-10-30 LS3C #122024-07-09 LS3C #21
A13-01Check list of facilities requesting to run during LS3 and respective requested services (including EN-EL). Raise any concerns/issues by mid-January to B.Mikulec or via the LS3 Scientific Secretary.All services/ groups2025-04-15Running FacilitiesCLOSED2024-10-27 LS3C #13Replaced by #16
A14-04Record in the RW forecast share-point any equipment presently stored in storage buildings that will be disposed as radioactive waste. The deadline is set for 30th of June 2025.All groups/ projects2025-06-30RadioprotectionCLOSED2024-02-19 LS3C #142024-07-09 LS3C #21

Resolutions closed before the 2024-11-27 LS3C #13 actions review:

TASK #DESCRIPTIONASSIGNEEDEADLINEDOMAINSTATUSOPENED IN CLOSED IN
A3-01To reach out to their RSO and inform RP regarding their planned interventions during LS3 before mid-June 2025, to assess if any ALARA Level 3 committee will be necessaryALL GROUPS/PROJECTS2025-06-15RadioprotectionCLOSED2024-04-17 LS3C #32024-11-27 LS3C #13
A4-01Reporting about L3 intervention at the LS3C within 6 weeks REMINDER: “each project leader needs to contact their RSO and each RSO needs to contact the groups in their department to collect the relevant information.RP2024-07-15RadioprotectionCLOSED2024-05-29 LS3C #42024-11-27 LS3C #13
A5-01Report on the power consumption simulations of SM18 during the reduction of the available electrical power capacity during LS3EN-EL2024-11-27EN/EL CLOSED2024-06-12 LS3C #52024-11-27 LS3C #13
R5-01Nominate a safety coordinator during the conception phase (part-time)SRF Project2024-11-27Safety coordination / HSE CLOSED2024-06-12 LS3C #52024-11-27 LS3C #13
A6-01Identify and communicate to the LS3 Scientific Secretary the name of the speaker for the LS3 Readiness Review in SeptemberALL GROUPS2024-11-27LS3C eventsCLOSED2024-06-26 LS3C #62024-11-27 LS3C #13
A10-01Communicate the impacts of the EN-EL consolidation activities on users and in particular experiments.EN-EL and ALL2024-11-27EN/EL CLOSED2024-08-21 LS3C #102024-11-27 LS3C #13
Coordination meetings initiated
A10-06Check the LS3 Readiness Review agenda before 05th of September 2024 and report any feedback to the LS3 Scientific Secretary.Groups/ Projects2024-11-27LS3C eventsCLOSED2024-08-21 LS3C #102024-11-27 LS3C #13
R10-01Ensure proactive coordination and adapt schedule with service/equipment groups, facilities, and projects for interventions on the power network of critical and safety equipment during LS3.EN-EL2024-11-27EN/EL CLOSED2024-08-21 LS3C #2024-11-27 LS3C #13
Integrated in EL quality plan
A14-01Provide the name of the safety person(s) (if not part of
the LS3C members already) to be invited to the safety-dedicated LS3 meeting that will be held in May
2025, before the 31st of March 2025.		ALL groups/ projects2025-03-31Safety coordinationCLOSED2025-02-19 LS3C #142025-04-02 LS3C #15
A14-02Provide or update the space request needs according to the new LS3 schedule. Inform if barracks/bungalows are provided by Contractors or by CERN. Before the 28th of February 2025.ALL groups/ projects2025-02-28Space ManagementCLOSED2025-02-19 LS3C #142025-04-02 LS3C #15
A14-03Submit all requests related to IT cabling (DC-IT) for the LS3 by SNOW ticket before the 31st of March 2025 and create the corresponding PLAN contribution (link the SNOW ticket number). Late requests may be subject to long delays or declined.All groups/ projects2025-03-31 InfrasctructureCLOSED2025-02-19 LS3C #142025-04-02 LS3C #15