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SCE Milestones for IRP Design Study
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Europe/Zurich
73/1-031 - 73-1-031 (CERN)
Présents: D. Rodriguez, G.Cnudde, M.Fraser, P.Santos, F.Pedrosa, J-L Grenard, F.Butin, I. Angulo, G.Humphreys, H.Garcia, B.Martinez, C.Ahdida
Target Building B754 (slides 5 - 7):
- Maximum building height and impacts on the Permit
- Are the roof equipment to be considered for the total height of the building (action SCE)
After meeting: there are no heigh limitations for the building permit at Prevessin site
- Service cell design
- Plan/drawing with worst case scenario of the loads and dimensions (action J-L Grenard and SCE)
- Service cell around 20T/m2
- Punctual load in the building up to 60T/m² for steel shielding
- Staircase
- Can the external staircase be included in the envelope of the building to improve the visual aspect (action SCE)
Access Shaft and B758 (slide 8):
- Shaft access and building B758 are no longer required for the project. Consequently SCE will stop studies on that topic and any reconsideration of this decision will have an impact on planning.
TCC8/ECN3 (slide 9 - 11):
- Slab cutting excavation ECN3
- Volume of excavation, cutting length, and approx location can already be estimated. (meeting with Spectrometer team to discuss feasibility) (action P. Santos)
- Load capacity of the slab in the excavated areas
- Load distribution map
- Definition of a map with estimated location of equipment and loads with a tolerance envelope in case of relocation of the equipment (action P. Santos)
- This will allow the structural studies to start and the precise location of the equipment can be adjusted and finalized later
- Excavation TCC8
- To be determined if an excavation is required (action J-L Grenard)
- Load map on TCC8 prepared by J-L Grenard, SCE to verify slabs capacity based on these loads (action SCE)
- Study
- Since works on ECN3 and TCC8 will only be executed in 2028 its study can be dissociated from the study of building 754. An external consultant will be appointed later to allow more time for defining the final configuration.
Network deviation and concrete trench (slide 12):
- To be investigated with EN-EL: (action Fernando)
- Latest date possible to finalise the trench without affecting EN-EL planning
- Other back up solutions to be studied:
- possible to pull the cables in the existing trench with extra float of cable to allow the deviation later
- Price and impact if the cables are pulled in the existing trench and cables are rerouted in LS3
- Start DO spec in case IPT request to do one (action SCE)
New B.911 Door cutting (slide 13):
- Sealing of 911 access shaft and removable slabs to limit temperature variation in ECN3 (action SCE)
- Temporary lean concrete to be added in the door front excavation for cleanliness and avoid having limited access and guard rails for a long period (action SCE)
Storage tent (slide 14-15):
- Tent furniture: wait the situation to evolve with other tents to mutualize the order (action F.Butin)
- Tent to be ready for use at the beginning of LS3 September 2026
- Start study the 2 cases of tent location and their access configuration (action F.Butin and SCE)
- Impact of location on HSE and excavation volumes
- Check its feasibility with Transport and RP
- Planning for the excavation and construction of the slab (action SCE)
Building renovation (slide 16):
- 911 and 912 renovation to be included in the project IRP
- 911
- External aspect harmonized with B.754 and insulation to be incorporated
- Internal renovation: painting, screed and floor finish to be renovated
- 912 renovation to be included because of its bad condition and the cost of renovation can be absorbed
- 918 to be renovated in LS4 as it was included in NA-CONS phase 2 and state is acceptable - to be discussed further
Planning (slide 17):
- Start a draft of IRP before the frozen CE design to be shared with different stakeholders (action SCE)
- Define the when the access to B.911 will be restricted during B. 754 works (action SCE)
- Organize regular CE meetings (action SCE)
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