Challenge
The primary challenge of this project was safely removing the highly irradiated lower reactor vessel from the Oak Ridge Research Reactor pool. Due to the high radiation dose rates and limited access, traditional cutting methods were not viable. The task required innovative adaptations to our diamond wire saw technology, allowing for remote operation and low-profile access to minimize radiation exposure to personnel.
To meet the project’s safety requirements, Bluegrass Bit modified its patented diamond wire saws for low-profile access and remote operation. The saws were deployed to cut the final pieces securing the lower reactor vessel at the bottom of the reactor pool. This method enabled the saw operators to perform all cutting tasks from a safe location outside the high-radiation area, significantly reducing radiation exposure.
The removal process involved several critical steps:
- Saw Modifications and Setup: Our team designed and installed custom brackets and pulleys to facilitate low-profile access and remote operation within the reactor pool.
- Precise Cutting: The 72-inch diamond wire saw was used to make precise cuts that released the lower reactor vessel.
- Lifting and Disposal: A 20-ton overhead crane was then utilized to lift the cut reactor vessel into a 32,000-pound protective cask. The cask was safely transported offsite for disposal, ensuring minimal environmental impact and compliance with regulatory standards.
Throughout the project, rigorous safety protocols were in place to protect workers and minimize radiation exposure. The use of remote-controlled technology was crucial in maintaining these high safety standards while effectively completing the deactivation and demolition tasks.
This project marks a significant milestone in the decommissioning efforts at ORNL, advancing one of the largest deactivation projects at the facility.
Outcome

