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Piping at Pumps
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Design Considerations - index
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Piping Containing Radioactive Materials cont'd


DOE-HDBK-1132-99
where a conventional piping arrangement would result in excessive
pressure drop in the system;
where the economics favor the expansion joint over a conventional piping
arrangement;
to compensate for differential expansion of a pipe within a pipe or at flued
heads.
1.3.8
Piping Containing Radioactive Materials . The routing of piping containing
radioactive materials should consider the reduction of exposure levels to ALARA.
Piping that contains radioactive materials should not be routed through
corridors. If necessary, shielding should be provided for the entire
exposed run.
Piping that contains radioactive materials should be routed close to the
floor, along walls, and away from the normal access areas to facilitate
cleanup in case of failure.
Equipment or components in the room may be used as a shield. Piping
that contains low or moderately radioactive material can be used to shield
piping that contains highly radioactive material.
Shielded pipe chases or trenches should be used wherever possible.
Multiple blockouts may be used for piping containing low or moderately
radioactive material. It is recommended that piping containing highly
radioactive material should have individual pipe penetrations.
Pipe penetrations should be located so that no direct lines of sight exist
from any source of radiation in a compartment to personnel in an
adjacent compartment or corridor.
II-14


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