Fréjus site pre-study and beyond

NNN07 - Hamamatsu 05.10.2007 M. Russo - Switzerland

Fréjus site pre-study and beyond

NNN07 – HAMAMATSU

Workshop on Next Generation Nucleon Decay and Neutrino Detectors

Hamamatsu 05.10.2007Hamamatsu 05.10.2007 M. RussoM. Russo

Site knowledge of Fréjus area

State of studies for enlargement of undreground lab

Further developements and items to consider for next stage design


TheThe AreaArea

670 km from Paris (F)

240 km from Milan (I)

190 km from Geneva (CH)

70 km from Turin (I)

200 km from Lyon (F)


Fréjus facilities and future projectsFréjus facilities and future projects

IN2P3 (CNRS) and DAPNIA (CEA) run the Modane Underground Laboratory (LSM) The Lab Facilities are composed by:

External LSM buildings (under

construction)

LSM Project for a 60’000 m3 extension to

be constructed according to on-going

projects (safety tunnel)A cavity of about 3’500 m3 at middle of Fréjus Road Tunnel in French Territory

Project for Large scale underground laboratory (1’000’000 m3)

For 3 types of experiments (Glacier, Memphys, Lena)


The Main Underground Projects in AreaThe Main Underground Projects in Area

Historical tunnelling in the area since 1480 (Pertuis di Visio)

…existing Fréjus Railway tunnel (1857-1871) 12.2 km …

…Fréjus Road Tunnel safety tunnel, 12.8 km…

…Lyon-Turin Railway base tunnel, ~57 km

…existing Fréjus Motorway tunnel (1975 -1978) , 12.8 km…


The underground LSM locationThe underground LSM location

Fréjus tunnel entrance

Railw

ay t

un

nel (a

ctu

al)

LSM underground facilities


The On-Going Safety Tunnel ProjectThe On-Going Safety Tunnel Project

Frejus safety tunnel project (safety tunnel to road tunnel):Aims to raise safety level of Fréjus Motorway tunnel by (Governments requirements):

• Adding 34 new shelters (every max 400 m) for auto-rescue of users;• Provide a safe issue for fire brigades for rescue purposes;• Provide an alternative issue to attack and manage fires and accidents in tunnel;• Provide new rooms for technical equipment renewals;• Accede to LSM without interferring with tunnel operation;• Possibility of maintenance of tunnel equipments not affecting Tunnel operation;• Provide fast access in case of accident.

• Internal safety tunnel diameter 8.00 m (clearance profile 6.6x4.0m)• 5 carriage cross-adits (bypass)• Longitudinal ventilation of safety tunnel• 2 underground ventilation plants• Portals energy supply up to 8 MW on each side

Frejus safety tunnel project 2006 (approved by Governments on 11.12.06):


Foreseen new laboratory rooms (60000 m3)Foreseen new laboratory rooms (60000 m3)

OPTION 2

OPTION 1

• 2 New Halls• exc. A=37’500 m3 (opt.1)• exc. A=41’000 m3 (opt.2)• exc. B=15’000 m3

• by-pass tot. exc. 14’415 m3

• Safety Tunnel not modified• No interruptions of LSM activities• Flexibility for future upgrades• Favourable orientation• Excavated volume may be accomodated at the Safety Tunnel Deposit (F side)


Megatonne project (SETEC-STONE)Megatonne project (SETEC-STONE)

Position between railway and road tunnel

Up to 5 independent shafts (various dimensions investigated)

130 m distance between shafts

Shafts of max diameter 65 m and max height 80 m

Total estimation of project (construction) 40+40 M € per shaft

<65 m

<8

0

m

<130 m


Megatonne project (SETEC-STONE)Megatonne project (SETEC-STONE)


The GeologyThe Geology

Trias Series

LSM Underground Facilities~1800 m overburden

Calcareous schists


Geotechnics and Excavation ResultsGeotechnics and Excavation Results

• Geology: Calcitic Schists UCS (30-80 MPa)• Overburden: about 1800 m • Fractures 4 main systems• Exacavation profitable orthogonally to actual Tunnel (ENE)• Very little seepage (cracks filled)

•Rock temperature around 30°

Geology


Projects milestones and relationshipsProjects milestones and relationships

Start of safety tunnel excavation

End of safety tunnel excavation

End of safety tunnel equipment

Operability of safety tunnel

2009 2010 2012 20142013 2015 20162011 2017

60

’00

0 m

3

LS

M e

xte

ns.

(3.5

mon

ths

excavatio

n)

Possib

le

sta

rting

p

oin

t Y0

of

“1

Mt”

exte

nsi

on

Y0 +

6 e

nd

of

civ

il work

s


Steps forward (location)Steps forward (location)

Fréjus railway tunnel

(actual)

Fréjus Highway tunnel

Safety tunnel (planned)

40

0

m

Position 1 between railway and highway tunnelUse of exhaust duct of tunnel to site ventilationUnderpass of highway tunnelDifficult mucking through safety tunnelDifficult energy supply (foreseen on opposite side)Difficult ventilation once in service Between two excavations (known area)

Position 2 eastbound of highway

tunnelComplement to small extension (single management and supervision)Mucking through safety tunnelProblematic site ventilation (exhaust)

Location of Megatonne project close to

actual labHigh overburden (~1800 m)Good rock quality (experienced during tunnel excavation)


Roadmap to preliminary designRoadmap to preliminary design

Optimize excavations and final dimensions (i.e. elmininating access, reducing inter-shaft links, optimizing shaft shapes).

Improove geologic knowledge (integrating knowledges from railway tunnel).

Define ventilation requirements of excavation according to design revision and new national regulations

Define needs in terms of cooling and purification equipment

Investigate on:

Compatibility of plannings among safety tunnel and Megatonne Project

Mucking solution via safety tunnel (by belt or by trucks);

Exact definition of interferences among safety tunnel operation and construction works (ventilation, waterelectricity supply, etc…)

Final destination of materials (Environnemental issues, possibility of re-use,…)

Refine costs estimations


Fréjus site pre-study and beyond

NNN07 – HAMAMATSU

Workshop on Next Generation Nucleon Decay and Neutrino Detectors

Hamamatsu 05.10.2007Hamamatsu 05.10.2007 M. RussoM. Russo

Thank-you for your attention

My personal idea of

neutrino

Fréjus site pre-study and beyond

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