SBLNF meeting 5 th Dec 2012 M Calviani A Ferrari R Losito ENSTI H Vincke DGSRP Outline 2 Update on the conceptual functional layout Neutrino production area Annex services morgue hot handling area etc ID: 366607
Download Presentation The PPT/PDF document "Secondary beam production facility layou..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Secondary beam production facility layout discussionsSBLNF meeting 5th Dec. 2012
M. Calviani, A. Ferrari, R. Losito (EN/STI)H. Vincke (DGS/RP)Slide2
Outline2Update on the conceptual functional layoutNeutrino production area
Annex services (“morgue”, hot handling area, etc.)Building sizes and requirementsComparison with similar installations in USA/Japan
5th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide3
Updates on the neutrino production area3Present solution adopts the “trench/chase” approach:
~20/25 meters long, for an internal size of ~3 metersNew proposition:Machine (cooling systems) rooms on the lateral/size to the target
area
Depends on the size of the trench that can be excavated
Impact on costs but reduced
pipings
Morgue and local shielding storage lateral to the target area
Hot handling cell located downstream the target vault
Personnel access to the target building from upstream
Shielding thickness adapted to radiation levels at 240 kW (MC,
link)Disclaimer: this proposition reflects requirements – it’s not integrated with services groups (CV, EL, etc.)!
5th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide4
Access conditions and H*(10) levels
4
No routine access to the target hall during operation
Shielding should be designed to respect an H*(10) of < 15
m
Sv
/h on the target vault during operation at 240 kW
Levels outside the building will have to be <0.5
m
Sv
/h (non designated)
5th December 2012
MC - Updates on SBLNF secondary beam facility layout
Decay pipe:
250 cm thick concrete shielding
5
m
Sv
/h at 10 m from beam axis
– DP possibly fenced on the surfaceConcrete/soil interface at ~30 mSv/h 5 mSv/h would require ~400 cm thick concrete
5
m
Sv/h level
H*(10) (mSv/h)
Z averaged middle DP
Vertical directionSlide5
Neutrino production area proposition5th December 2012MC - Updates on SBLNF secondary beam facility layout
5Slide6
Neutrino production
area proposition
6
5th December 2012
MC - Updates on SBLNF secondary beam facility layout
S
hielding:
There are margins to reduce the H*(10) on the vault floor by adding concrete blocks
Chase size matched with a 3 m diameter DP
< 15
m
Sv/h
< 1
m
Sv/h
< 10
m
Sv/h
Present configuration assume:
Machine rooms & morgue excavated lateral to chaseSlide7
Possible configuration of the “morgue”7Two possibilities could be envisaged for the
radioactive material disposal areaGround level lateral from the main target vaultLess underground works
Need significant shielding + complex transport?
Located in a
separate trench lateral to the target chase
Easier shielding in case of very hot objects (objects could reach ~
Sv
/h)
Can be used also to temporary store shielding blocks
More complex CE works to excavate the trench
Could be used to prepare the shielded transport caskSize will depend on assumptions on hot objects exchange rates & transport requirements – temporary storage?
5th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide8
Neutrino production area5th December 2012MC - Updates on SBLNF secondary beam facility layout
8Slide9
Hot handling work cell possible configuration9
Potential use of a “radioactive working cell”:Horn
mechanical connection to
the shielding module
, remote
strip line
clamp, waterline connection to horn, electrical connection to
horn, target inspection
5th December 2012
MC - Updates on SBLNF secondary beam facility layout
Location?
On the
target vault floor
, downstream the chase shielding
Easier manipulation and
access
Concrete enclosure,
w/ internal cameras
for local
inspectionNo lead glass window Front sideSlide10
He-vessel conceptual
10
He-vessel enclosure, 1
atm
He-gas:
Pros:
Reduce pion absorption
Suppress
3
H by ~25%
wrt airSuppress NOx production and corrosion (factor of ~100x)Suppress 7Be, 41Ar,
32P, etc. sure benefits for global releases
See H. Vincke,
link
Cons:
Quite complicated to build – huge He volume to handle – need to guarantee leak tightness for
feedthroughs
Expensive solution
Target station & decay volume – unique volume
No beam window required between TS and DP5th December 2012MC - Updates on SBLNF secondary beam facility layoutSlide11
He-vessel conceptual11Configuration:
Thick steel layer – ~20 m (L), 3 m (W), 8 m (H) Evacuation of the He-vessel required to remove air and avoid condensation (i.e. corrosion) during operation
Cooling
channels
might be needed to cool down the vessel (~20/30 kW deposited
)
Air/water cooled?
Is a
shutter
separating the TS from the DP during access required?In order to recuperate He during evacuation, need of external compartments
Total volume ~1100 m3
(480 TS + 620 DP)
It’s urgent to study the viability of this option vs. an open air circulation system
5th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide12
What needs to be cooled in the chase?12Target
– possibly an He cooling systemHorn/reflector – water coolingHe-vessel circulation (*)
– He cooling system
He-vessel plates (*)
– water (or air?) cooling
DP collimator (?)
– water cooling
Hadron Absorber
– water cooling
Upstream collimator/baffle
– cooling not needed?5th December 2012
MC - Updates on SBLNF secondary beam facility layout
(*) with an open air atmosphere these would be probably exchanged for a forced air cooling loopSlide13
Decay pipe133
or 3.5 m Ø ~90 meters long volume (~110 m from target
)
Shape
cylindrical
or
parallelepiped
(a-la-T2K)
What’s the level of the moraine/molasse interface?1974 bore: close to TCC2, waterbed in moraine at 20 m below ground level (431 m)Molasse ~429 m (22 m from surface)5th December 2012
MC - Updates on SBLNF secondary beam facility layout
Courtesy: J. OsborneSlide14
DP - geomembraneDP: high level of prompt dose rate over a large distance risks of soil
and water activation
Geosynthetic barrier system
: protect the surrounding groundwater from any possible tritiated water escaping the decay region
5th December 2012
MC - Updates on SBLNF secondary beam facility layout
14
Separate barriers (LBNE approach):
Geomembrane
Geosynthetic clay liner barrier
Geonet leak detection layer
http://
lbne2-docdb.fnal.gov:8080/0046/004623/006/CDR_Vol_5_MI-10CF_20120313.pdf
Slide15
Hadron absorber area155th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide16
Hadron absorber area165th December 2012
MC - Updates on SBLNF secondary beam facility layout
Pit1/HS
Absorber cooling mandatory – cooling station will be certainly quite hot (~50 kW power to dissipate)
Access limited for maintenance
Pit1 access requires local bunker due to material activation
Crane required
Pit2:
Could potentially be even a barrack – no RP issues foreseen (H. Vincke,
link
)
No fixed crane required
Pit1/HS
Pit2Slide17
FNAL NuMI configurationNuMI target station deep underground (beam level ~50 meters below ground); target hall is ~40 meters deep Facility adapted to handle 400 kW beam powerSurface target service building to access the deeper vault
5th December 2012
MC - Updates on SBLNF secondary beam facility layout
17
Target hall = 53 m length, ~8 m wideSlide18
FNAL NuMI configuration185th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide19
JPARC/T2K configurationJPARC has a surface target vault, with a beam axis located ~20 meters below ground levelFacility adapted to handle 750 kW (1.6 MW) beam power
Several annex buildings are located on the surface5th December 2012
MC - Updates on SBLNF secondary beam facility layout
19Slide20
JPARC/T2K configuration205th December 2012
MC - Updates on SBLNF secondary beam facility layoutSlide21
Conclusions21Updated secondary beam line functional specifications
Location of the morgue to be confirmed in collaboration with DGS/RP
Cooling station/hot service rooms
location to be confirmed/discussed with DGS/RP and GS/SE, as the target vault/chase size depends on this as well
He-vessel certainly an advantage, but costs and technical complexity worth?
5th December 2012
MC - Updates on SBLNF secondary beam facility layout