JPARC- Decay Volume M.Sakuda (KEK) 11 November 2003 1. Decay Volume Requirements Design 2....
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JPARC- Decay Volume
M.Sakuda (KEK)11 November 2003
1. Decay Volume
Requirements
Design
2. Construction Status
3. Summary and schedule
In collaboration with A.Ichikawa, E.Kusano, Y.Yamada, T.Kobayashi, H.Noumi, M.Takasaki, T.Ishida, Y.Hayato, Y.Oyama, T.Suzuki, T.Miura
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1. Decay Volume (DV)Primary Proton beamline
Target Station
Decay Volume
280m Near DetectorSK
50GeV PS
pit
3NBT
Requirements 0.8MW of energy loss in DV region @4MW operation.
Radiation safety regulationCoolingMechanical stability
Tight schedule Construction of 3NBT tunnel will begin from JFY2004. A part of DV beneath 3NBT, 30m long, must be completed in May, 2005.
110m
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Heat Generated at Decay Region (4MW)
Steel plate (Pipe)
Concrete
suppresses particles effectively.
Z=010m(20cmt)
Target Station
Collimator
16mmt
Decay Volume
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Design of Decay Region
1) Mechanical shape • � (square) box is cheaper than Ο (cylinder) by 20-30%.
• 16mm-thick steel is strong enough to endure the weight of 2m concrete during the construction and the thermal stress (later).
• One plate is 4mx2m wide, welded with ribs embedded in concrete. In addition, anchors every 4.5m pitch.
2) 5.0-5.9m thick concrete and 6m of soil surrounding the iron box is needed for radiation safety regulation <5mSv/h. (Oyama’s report)
3) Filled with Helium
• About 7% more flux than air.
• Less Tritium rate by a factor 1/3 than air. (<30Bq/cc)
4) Cooling under 4MW for Iron <60deg, Concrete <120deg
• 20 Plate-Coils (S=6.7cm2) with 1.2m/sec water flow
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Decay Pipe
114m
1.5m x 1.9m at the entrance 3.0m x 5.4m at the end
Top View
Side View
Design of Decay Region
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Decay Volume common with SK/HK
Beam View
SK
~10km
HK
ハイパーカミオカンデの候補地
Decay Volume
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2. Construction of Decay Volume- Iron Plates (16mmt) with PlateCoils -
Platecoils (1cmtx6.5cmw)
Platecoilswelded oniron plate
•Production in 2002-2003• 71.4m(/110m) plates purchased.
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(continued)
2003年3月
Pressure test
Complete
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Platecoil for Water Cooling System
Chemical Plant
Beer VesselExperimentalInstrument
Decay pipe
Joint
•Many industrial applications -Cheap and reliable• Welded on the inside wall ofdecay pipe- Area 6.7cm2 ,1.2m/sec
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Arrangement of Watercooling Pipes (platecoils) inside DV iron plates
Cross section Beam directionTop
Side
Bottom
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Thermal analysis for 4MW beams
•FEM analysis for 4MW beam with 40 water-cooling platecoils
•Realistic condition(1/2 year 100%, 1/2year 0%)x30year.
Input water =30degC
Max temperature
•Plate <60degC
•Concrete <120degC
OK.
Thermal Conductivity (kcal/m ・ hr ・℃ )
Density (kg/m3)
Specific heat (kcal/kg ℃・ )
SteelConcreteSoil
44.2 1.4 0.46
7860. 2300. 1890.
0.113 0.21 0.21
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Mechanical Analysis
Young modulus 19600kgf/mm2, Poisson ratio 0.3,Linear expansion coefficient 0.00001153 1 /℃
•~4m x 1.8m steel welded with steel ribs (H channels) at every corner. In addition, anchors are welded every 0.45m.No Buckling happens below 70 °C.
4m 1.8m
··
RibsAnchor
Mechanical Specifications are decided.
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Utility room At Target Station
Decay Volume
Buffer tank
Buffer tank(10m3x3)
Dilution tank(10m3x3)
Heat exchanger
Design for Water Circulation System-A first draft-
Heat exchanger
Disposal15Bq/cc
Utility room At Beam Dump
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Summary
• FY2003:Design of the decay volume (Z=10-110m) with 4MW beam condition complete.• FY2002-2003: Iron plates with platecoils (for 71m long) purchased.
• FY2003:
• Civil engineering design of Decay Region is being done.
• Details of the installation (Spec Document for installation of DV) must be
decided within FY2003. Schedule and budget is very tight.
•Construction of 3NBT line will begin in FY2004. DV beneath 3NBT tunnel,
30m (70m) long, must be completed in May, 2005.
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•Tasks
•Spec document for the DV installation (FY2004)
•Design of Collimators+Iron plates(10m-long 20cm-thick)
•Design Vacuum system+Window and Endplate
•Design of water circulation system
•How to protect iron plates from rusting with seawater permeating nearby
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Decay Volume Schedule2002 2003 2004 2005 2006 2007 2008 2009
Design
Iron plates
DV crossing 3NBT70m(30m)
DV Remainder40m(80m) Installation
Installation
Production
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Disposal Scenario of Radioactive Water
•After 20days operation, all radioactive water is transferred to a DP tank in the disposal system. The cooling system for decay volume considers this scheme.
•They are mixed with fresh water in the dilution tank.
•After measurement of radioactivity in the dilution tank, the water can be disposed. It takes 1 or 2 days for the measurement.
Y.Oyama
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Arrangement of Iron Plates on DV