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5 Maintenance and fault rectification
SHLD1 • Source holder
62092-EN-190704
An emergency situation exists if a radioactive source is no longer
inside the source holder, if the source holder cannot be switched to
"OFF" position or if an increased local dose rate has been detected in
the proximity of the source holder.
The emergency procedure protects the affected persons until the
responsible radiation safety officer arrives and prescribes further
measures.
The person charged with the supervision of the radiation source (i.e.
the person stipulated and authorized by the plant operator) is respon-
sible for implementing this procedure.
•
Determine the dangerous area on site by measuring the local dose
rate in µSv/h
•
Generously cordon off the affected area with yellow marking tape
or rope and mark the area with the international radiation warning
symbol
In this case, the source holder must be dismounted. The radiation
safety officer has to prescribe dismounting.
Direct the exit channel towards a thick wall (e.g. of steel or lead) or
mount a blind flange in front of the exit channel.
Persons may only stand behind the source holder. Never stay in front
of the radiation exit channel (flange or mounting surface of SHLD1).
The transport lug on the housing facilitates safe handling.
In this case, the source must be kept secure in another place or an
additional shielding must be provided.
The source may only be transported with pliers or a gripper and the
distance to the body must be kept as large as possible.
The time required for transport should be estimated and optimized in
advance through tests and training.
•
Pass all necessary information immediately on to the responsible
local and national authorities
•
After a thorough investigation of the situation on site, the respon-
sible radiation safety officer must agree, together with the local
authorities, on appropriate corrective measures for the existing
problem
Note:
National regulations can prescribe deviating procedures and notifica-
tion requirements.
The source holder cannot
be brought into position
"OFF"
The source is no longer
in the source holder
Informing the responsible
authority
