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Summary - hdbk1132990157


DOE-HDBK-1132-99
Confinement . The selection of the confinement system to be used during
D&D operations will be dependent on the condition of the existing building and
ventilation system. It is possible that the existing structure and ventilation
system is adequate without change or upgrade. Where existing systems are
judged to be inadequate, the designer should consider enhancing the existing
system with portable ventilation and tents within the building. The tents and
ventilation would provide the active operation zoning function while the existing
structure and ventilation would continue to provide the shutdown condition
confinement for the remainder of the building. Care in the accident analysis
and design is needed to ensure that credible accidents will not propagate
beyond the work zone.
Radiation Shielding . Shielding design in cleanup activities relies on specific
source reduction rather than shielding walls used in process operations.
Design related to portable shielding is limited to the material (high z or low z),
thickness, and features to make the shielding material easy to install, relocate,
decontaminate, and remove so that it can be reused (waste minimization). The
available space and shape of the object generally determines whether to shield
the object or shield the worker (portable shield wall). Shielding design for
buried items may have to be modular and layered because it is not always
possible to determine radiation levels of buried items until they are actually
uncovered.
Structural Integrity . Structures provide confinement, shielding, a stable
anchor for fixed equipment, segregation or isolation, and a controlled
environment (dust, humidity, and temperature control) for equipment important
to safe operation. Portable equipment is generally self-standing and does not
require an anchor for short-duration use. This leaves the functions of
segregation and climate control. Both of these functions can be provided by a
tent or, under more severe cases, sheet metal structures. The choice of
structural material depends on factors such as duration of the activity,
consequences of structural failure, geographical/meteorological conditions
(snow or wind loading), and whether or not an existing structure is involved
(D&D or soil remediation). Consideration should be given to limiting the mass
I-140


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