Quantcast Valves - hdbk1132990185
 

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Piping Containing Radioactive Materials cont'd
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Design Considerations - index
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Valves cont'd


DOE-HDBK-1132-99
Encasement piping for process lines connecting valve pits or diversion
boxes should be equipped with leak detection systems. In cases where
more than one pipeline terminates in a valve pit or diversion box, the leak
detection system should be designed with the capability of identifying
which line is leaking.
Primary process piping and encasement piping should be provided with
capabilities for periodic pressure testing. The design should restrict the
use of freeze plugs for pressure testing.
Transfer lines terminating at a tank should be provided with pressure
testing capabilities.
Primary and secondary piping should be supported and anchored.
Supports should be adequate to carry the weight of the lines and
maintain proper alignment.
Pipe guides and anchors should be provided to keep pipes in accurate
alignment; direct the expansion movement; and prevent buckling,
swaying, and undue strain. Spider-type supports should be provided
inside the encasement piping to permit leak detection.
Process piping carrying radioactive material should be buried
underground or otherwise shielded to provide radiation protection.
Process piping should be equipped with valves at appropriate locations to
facilitate maintenance within ALARA guidelines.
Piping and equipment containing radioactive material should be designed
for ease of decontamination during operations and for ease of
decommissioning after the building life cycle.
Valves. Valves should be located in systems to provide proper isolation for
1.3.9
maintenance tasks, normal operations, and reduced radiation exposure.
II-16


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