ESS Bunker Project
Zvonko Lazić
www.europeanspallationsource.se
September, 2014
Layout
The central ESS
building is home to
the target systems
and majority of
instruments.
The target monolith is
shielded by ‘the
bunker’.
The Bunker is created
by stacking (concrete)
blocks around the
monolith in sufficient
depth to reduce
radiation levels in the
surrounding
environment to
acceptable level.
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Layout
Since no instrument is fully defined yet, we continue with
the bunker design with following caveats:
• We concentrate initial efforts to the upper portion of
the bunker,
• Select and develop stacking strategy,
• Support structure for the bunker will be developed at
a later stage, once we have better idea of
instruments placement,
• Parallel to this effort, the physics part of the project
is developing concrete formulation(s) to be used for
production of bunker blocks,
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Initial Brief – Bunker profile
Crane hook height
Target axis
Bunker profile up to R15m
Target Centre
Beam-guide axis
Instruments ‘floor’
CF floor
Requirements are plenty and contradicting:
Maximize block size to the crane capacity
Minimize number of blocks
Maximize radiation protection
Allow for ease of assembly and disassembly
Minimize number of ‘lifts’ required to reach key
components under the bunker
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Initial work – Concepts
Initial brief is answered with a series of hand-drawn concepts.
Three main concept directions are identified and discussed.
•
•
•
Maximizing all block sizes to the crane capacity (this
reduces the number of blocks in the assembly, therefore
reduces the number of required lifts to access hardware
underneath, minimizes the number of joining
surfaces/planes therefore maximizes the radiation
protection.
Introducing “in-between-blocks” (creating option above
with smaller “joining blocks” which can be attached to
either one of the neighboring blocks; this minimizes
number of lifts).
Using “pavement” layout (all blocks are the same
size/shape; lying down the pattern is done disregarding
angular nature of an instrument ‘wedge’).
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Initial work – Developing concepts
Model initial concept; evaluation
done on the following criteria
Number of lifts
Shielding performance
Manufacturing complexity
Section through the stacked bunker to show joining planes (x-z and x-y planes)
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Initial work – Developing concepts
Unstacking one instrument “wedge”
up to R15m
and unstacking one complete
instrument “wedge”
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Initial work – Developing concepts
Second concept showing general
layout and stacking section
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Initial work – Developing concepts
Second concept showing
Unstacking sequence for
one instrument “wedge”
9
Initial work – Developing concepts
“Tile” concept
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Initial work – Developing concepts
Unstacking sequence and y-z section
11
Summary
• Bunker roadmap
– Evaluate different stacking concepts
– Design supporting structure taking into account
instruments (space) and other requirements
– Detailed design
• Mix formulation concluded (we know what are the material
properties)
• Blocks manufacturing technique(s) determined (cast in shell or..)
• Supporting structure detailed analysis
• IKC or supplier…
• Production
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