WP7 focus meeting - SCE: Underground water collection network #1

Tuesday 18 Nov 2025, 10:30 → 11:30 Europe/Zurich

Attendees: J-L. Grenard, D. Rodriguez, R. Kallada, O. Rios, O. Pinto, I. Angulo, J. Scott Currie, B. Bouvet

 

Inventory of the existing network:

There are 2 separated networks in the ECN3 and TCC8:

• An internal water collection network which is directed to the Industrial Waters system. It collects the waters that are inside the galleries, including equipment leaks and other internal sources.
• An external water collection networks  which is directed to the Rainwater system. It collects the waters at the base of the gallery waterproofing layers, outside of the structure. 

 

The lowpoint of both network is located under the B911 pumproom where it is pumped to the surface and connected in corresponding network (industrial and rainwater)

 

Needs for HI-ECN3 Project:

The waters collected from ECN3 (SHiP) and TCC8 (BDF) will not have the same properties/specificities and should not be mixed.

ECN3 waters have an environemental risk because of the Liquid Scintilator and other process water that can leak.

TCC8 waters will be activated and have a RP risk.

 

Volume estimations:

• TCC8: RP activated water
• Firefighting water : ~ 4m3 
• additional volumes foreseen ? --> EN-CV and other stakeholder to confirm

 

• ECN3: Industrial waters (no activation)
• Liquid scintilator ~ 150m3 (canot be mixed in drainage industrial water)
• Other volumes ? SHiP to confirm

 

Solutions under study:

1. TCC8 RP waters

Installation of a 3rd pump in the pit of the pumproom to transfer the RP waters to surface and connect it to B754 sump system.

--> feasability for installation of a pump in the existing pit ? (action SCE)

--> constraints for collecting and processing this activated water ? (action HSE-RP)

 

1. ECN3 industrial waters

Re-use the existing drainage and pump system.

--> inventory of the industrial water network (underground and surface), and how the waters are processed in EHN1 (SCE/EN-CV)

 

In case of a leak of the Liquid scintillator (~150m3) the liquid shall be retained and not mixed to industrial waters

Solutions under study:

1. Resin coating all over ECN3 floor

But difficulty to achieve complete watertightness over all surface of the cavern, the Spectrometer magnet pit will be the low point, flooding of the industrial water network

1. Watertight retention tank underneath the Liquid Scintillator

--> SHiP to confirm a solution

10:30 → 10:50 SCE presentation

Speaker: Guillaume Cnudde