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DOE-STD-1120-2005/Vol. 1
3.1.2 Systems, Structures and Components
A description of SSCs which are being decommissioned, including a description of buried
structures that will be remediated, should be presented. This information should include the
existing configuration and interdependencies of SSCs, and in particular any degradation or other
changes that may have occurred relative to the original design. A description of new or
temporary SSCs which may be needed to prevent or contain the spread of radioactive or
hazardous materials during decommissioning should also be provided.
Interdependencies among SSCs should be described to the extent they will be affected by the
decommissioning, and to the extent necessary to facilitate an adequate understanding of the
hazard analysis. Equipment being dismantled may be structurally linked to safety SSCs that are
not planned for retirement until a subsequent phase of decommissioning. The means by which
integrity of the remaining structures will be assured should be described.
To the extent possible at the time of DSA preparation, it is important that SSC changes
anticipated during the course of the decommissioning project be described in the DSA to reduce
the potential activities that must be separately evaluated in accordance with the USQ process.
Additionally, the timing of SSC changes within the overall project work scope should be stated
to support proposed rationales for retiring safety controls.
3.1.3 Operational History
Information from the operational history of the facility, which is important in understanding the
hazards and state of SSCs should be compiled. Information on previous modifications to the
design that may have an impact on the safety of decommissioning should be presented.
Operational information about previous facility processes and the location of radioactive
contamination, both as a result of normal operation and resulting from incidents or accidents,
should be also presented.
3.1.4 Decommissioning Activities and Techniques
Since the decommissioning activities themselves, by their nature, can be a source of accident
initiators, it is important that decommissioning equipment and processes be sufficiently
described to the extent necessary to support the hazard analysis and control selection. At the
highest level, this description should include the major phases of decommissioning including the
removal of remaining hazardous material inventory; the removal of fixed contamination from
surfaces and equipment; dismantling of systems and equipment; demolition of major structures;
or other defined end-states for the facility. Where sequencing of these activities is important,
this information should also be presented.
Decommissioning techniques should also be described. The requirements for power, cooling
water, and other external supplies to the equipment used to carry out these techniques should be
documented. Hazardous chemicals, heat or ignition sources, combustible or flammable
materials, or other types of hazards that could be introduced in the facility as a result of the
chosen decommissioning techniques should be described. The expected quantities and location
3-3


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