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DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
asphalt or vinyl tile because it is more easily cleaned. If the floor needs resurfacing, it is
preferable to overlay new flooring material rather than remove the old material and expose
the underlying floor.
Carpets are not recommended because they are difficult to clean and survey and bulky to
dispose of and they do not adequately protect the underlying surface. In some areas, such as
control rooms, their use may be justified by noise control requirements; however, their
contamination control limitations should be considered. If used, carpets should be surveyed
frequently and disposed of as radioactive waste when they become contaminated.
10.2.2 Ventilation Systems
In addition to decommissioning considerations, the design of the ventilation system will
depend on the operations that will be conducted in the facility. Adequate air flow for all
operations and good design practices will help keep the facility clean during operations and
will facilitate decommissioning. Fiberglass duct work may present a fire hazard and may be
more difficult to decontaminate than stainless steel, especially stainless steel that has been
electropolished. Welded joints are less likely to collect contamination than bolted ones;
however, bolted joints are easier to remove and the most contaminated areas are readily
accessible for cleaning.
Filters should be positioned in ventilation systems to minimize contamination of ductwork
(e.g., filtration of glove-box exhaust air before it enters a duct leading to a plenum).
10.2.3 Piping Systems
Potentially contaminated piping systems that are imbedded in concrete are a common and
relatively expensive decommissioning problem. Most often, they must be sealed and
removed last, after all other radioactive material has been removed and the building is being
demolished by conventional methods. Often, they provide the major impetus for
demolishing a building rather than converting it to some non-nuclear use. For this reason, it
is best to run pipes in chases or tunnels that have been lined (usually with stainless steel) to
prevent contamination from penetrating building surfaces. To minimize hand jackhammer
work required during decommissioning, floor drains should not be enclosed in concrete.
10.2.4 Soil-Contamination Considerations
Depending on the activity levels found, locations where contaminated effluents have
penetrated the ground may require excavation during decommissioning. The facility design
should minimize such areas. Particular attention should be paid to storm runoff from roofs,
storage areas, contaminated equipment storage, and liquid waste treatment impoundments
10-7


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