Speaker
Markus Brugger
(CERN SC/RP)
Description
The radiation protection of the personnel who will perform
interventions in the beam
cleaning insertions and install different phases of machine
components is mandatory
and includes the design of equipment and the establishment of work
procedures. Dose
rates are expected to reach values at which any maintenance has to
be planned in
advance and the design adopted in order to keep the accumulated dose
as low as
reasonably achievable (ALARA-principle). Three-dimensional maps of
dose equivalent
rates at different cooling times after operation of the LHC are
available for IR7
and allow the calculation of individual and collective doses for
different
interventions. The latter would require information from the
involved groups on
intervention steps, duration and frequency.
The presentation summarizes the results of detailed FLUKA-
simulations and sketches
its potential for optimizing, in an iterative way, the design of
components as well
as the layout of the beam cleaning insertions. Examples are
discussed for the dose
estimation based on detailed intervention scenarios and a first
attempt is given to
infer from it the annual collective dose. The derived value is
compared to design
constraints as well as the collective doses accumulated during SPS
interventions. It
is also put into perspective with annual doses reported by other
laboratories and
the nuclear industry.
Author
Markus Brugger
(CERN SC/RP)
