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TCC8 and ECN3 water retention

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Participants: David Rodriguez, Guillaume Cnudde, Claudia Ahdida, Pablo Santos Diaz, Oriol Rios, Arnaud Kolzer, Gemma Humphreys, James Currie, Rahul Kallada

Agenda:

  1. Sanity check of water retention solution for TCC8 and upstream TCC8
  2. Explore water retention solutions for ECN3

 

Guillaume described the existing networks at the surface

  • Gravitational network of pipes at the surface until EHN1
    • Industrial water discharged to Lion river.
  • TCC8 target area has retention tank
    • It is important to have a level monitoring for the retention tanks
    • CV alarms should be shared with the CFRS
    • Retention basin for the target area should have an additional retention basin
    • Position of the drainage network is not defined in TCC8.

Open Action: Drainage model of the TCC8 and ECN3 to be shared with Gemma - Resp: Guillaume Cnudde, David Rodriguez, Deadline: August 12, 2026

Open action: The placement of retention basin to be decided. Jura or Saleve side. Conflicts with other equipment to be checked. Shape of tanks, number of tanks etc. - Resp: Guillaume Cnudde, David Rodriguez, Deadline: August 12, 2026

Open Action: Who does the monitoring of the volume of the retention basin? Answer: EN-CV installs the level monitoring alarm. The alarm is handled by EN-AA (CSAM alarm) and produces a Level 3 alarm which goes to the CFRS.    We can suggest the monitoring level required. Ideally, one RP alarm and one level indicator for firefighting. - Answered by Henrik Nissen

  • Cooling water leaks will also go into 4 m3 retention tank. Cooling water leakage has not been accounted for in the current volume.
    • MHS and Muon shield magnets are water cooled. Leak can occur at the MHS or before. Cooling water comes from BA82.

Open Action: The control of water leakage for cooling water coming from BA82 to be checked.  - Resp. Claudia Ahdida, Gemma Humphreys?? , Deadline: August 12, 2026

  • For TCC8 upstream part - Conventional water has negligible activation - Flows towards the pump room in ECN3
    • Chemical or other pollution is unknown

Open Action: Pavol to be invited to the next meeting to provide insight into contamination levels - Resp. Rahul Kallada - Done

 

ECN3 retention discussion:

  • Liquid scintillator is the main pollutant identified. Retention basin provided - https://indico.cern.ch/event/1620152/
    • Muon shield is water cooled. Prone to leakage. 
  • Water leakage more probable than fire in ECN3.

Open Action: Firefighting water to be estimated. - Resp. Rahul Kallada, Deadline: August 12, 2026

  • Spectrometer magnet pit = 9 m x 8 m x 0.1 m = 7.2 m3
  • 3 options available for water retention in ECn3
    • Use the floor of the cavern
    • Pump it to surface and goes through the industrial water network
    • Use the magnet pit as the retention
  •  
  • Retention basin to be dimensioned according to the operational water rate used for cooling.

Open action: Check if double walled pipes are needed for the pipes of the proximity shielding. - Resp: Claudia Ahdida, Gemma Humphreys??, Deadline: August 12, 2026

  • For TCC8 upstream part - Conventional water has negligible activation - Flows towards the pump room in ECN3
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