The D4 Project is responsible for deactivating, decommissioning, decontaminating and demolishing 486 excess facilities at the Hanford Site. This includes excess facilities in the 100 Areas (except the retired reactors), facilities in the 300 Area and support facilities in the 400 Area not associated with the Fast Flux Test Facility.
The D4 process involves:
Deactivation – Shutting down any operations or processes that may be ongoing as part of the building lifecycle.
Decommission – Removing energy sources, such as electricity, steam or natural gas.
Decontamination – Removing or stabilizing radioactive and hazardous contaminated materials, including items such as light ballasts and chemicals.
Demolition – Removing building structures and slab or foundations.
The D4 Project team is removing facilities ranging from small mobile offices to highly contaminated multi-structured facilities, waste storage pads, sewage treatment structures, stacks and tanks.
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