RICHLAND -- The final design detailing the structural concrete for the Pretreatment Facility at the Hanford vitrification plant has been completed.

The drawing represents the completion of the facility's concrete floors and results from more than 15,000 pages of calculations and 500 drawings. These calculations and drawings provide the details that enable crews to construct the massive concrete structure.

"Completing the structural concrete design for the Pretreatment Facility -- the largest vit plant facility -- is the culmination of more than 500 vit plant engineers' and designers' working over several years," said Tom Patterson, manager of engineering at the plant, in a Bechtel National news release. "It is an important milestone that enables us to fully support the vit plant's construction schedule."

The Pretreatment Facility structural concrete design includes calculations and drawings that are upheld to the highest nuclear safety and quality standards, the release said.

Every inch of concrete design -- wall or floor-- underwent extensive review to ensure it met all regulations and requirements.