Emergency Cleanup Of Collapsed Waste Storage Tent
An EWP Success Story: Oak Ridge (Y12)
On January 5, 1997, at approximately 2:30 a.m., a large canvas tent covering a one-quarter-acre storage area for 1,500 barrels of radioactive and mixed waste on Chestnut Ridge above the Y12 site at Oak Ridge was blown away by gale-force winds. An initial assessment showed that two of the tent's four main support beams had fallen, rupturing barrels and spilling their contents. The two remaining beams, though still standing, were only partially connected, threatening to fall onto other barrels. The collapsed structure created a heap of tons of steel cables, toppled beams, tent canvas, and leaking hazardous waste containers.
Stabilizing the critical situation demanded immediate corrective action. Detailed plans needed to be developed to ensure that the fallen beams were cleared, the partially connected beams stabilized, waste containers relocated, leaking drums removed and the contents repackaged, and that the 10,000 gallons of contaminated rainwater within the facility's diked area cleaned up. Concomitantly, work had to proceed in accordance with requirements and controls necessary to protect the environment and the health and safety of those involved.
|Drum repair kits or drum tourniquets can be used for quick temporary repair of drums, barrels or tanks in order to contain hazardous waste and liquids until permanent containment can be implemented. Leaking drums can be transfered into overpacks or salvage drums allowing you to handle and transport hazardous materials safely.|
As highlighted below, the incident provided an opportunity for demonstrating many of the fundamental tenets of enhanced work planning at Oak Ridge.
After Waste Management and the plant shift superintendent's office performed initial inspections, the Maintenance General Supervisor was contacted to lead the planning and oversee the response operations. Y12's rigger planner was then notified and he and the Maintenance General Supervisor met with plant managers in the Emergency Operations Center at 4 a.m. to determine how they would coordinate the efforts to stabilize and repair the fallen structure safely.
The Y12 Plant Manager and the management team emphasized that the objective was to work safely and minimize any damage to the remaining barrels. They made clear that the job must be planned and executed in a safe and timely manner with a coordinated effort from all necessary organizational groups.
Work Scope and Responsibilities Clearly Defined Up-Front
In order of their importance, the primary necessary tasks were the clearing of the two fallen beams and the stabilization and subsequent removal of the standing (partially connected) beams to ensure that no additional damage would occur. To avoid collapse of the remaining structure, the clearing would need to be accomplished the first day. Stabilization work would need to be coordinated with environmental personnel who were assigned to assess, contain, and clean up releases from the barrels.
Up-Front, Multidisciplinary Planning; Worker Involvement; Parallel Review; Job Walkdown; Hazard-Based/Graded Planning Approach
To determine how the work was to be done, a multidisciplinary planning team was assembled at the site at dawn. The team, consisting of maintenance supervisory personnel, a planner, ES&H (Environmental Safety and Health) support, and craftspeople, walked the job to consider options and arrive at the best plan of attack for each task identified. Emphasis was on drawing on the craft skills of the workers involved. Through the collaboration of the various disciplines involved, the planning team was able to look simultaneously at all aspects of the job and arrive at an effective, coordinated plan.
Once the first phase of the planning was concluded, a formal lift plan was developed and set in motion, with the participation and simultaneous approval of the appropriate support groups (i.e., industrial safety, industrial hygiene, environmental, engineering, quality assurance). After the two partially connected beams were lifted into place by two large mobile cranes, the cables and bolts still connected to them were cut so that the beams could be properly reset. This process required close coordination between two crane operators, two crews working out of two bucket trucks, and the ground crew.
The same crew (already familiar with the first successfully completed lift) then developed lift plans for each additional lift using the already-proven planning approach. Critical-lift plans were developed and completed for each of the four main beams. For the less critical lifts (beam disassembly, section movement, loading), the crew did not create formal plans, instead relying on craft skills.
|Have trained personnel in charge to assess the site and determine what risks and hazards are present. Preparing an effective plan is paramount for minimizing injuries, enivironmental effects and costly damages. Dawg offers a large selection of safety training materials to help keep your personnel up to date and well trained to handle any crisis.|
Measure Performance; Draw from Lessons Learned
Operations went smoothly. Planning for the first critical lift (stabilizing and cutting cables) took approximately 4 hours (as compared to an estimated minimum of 2 days to plan and get all the approvals for this type of priority critical lift per Y12's normal procedure). Initial tasks (from the inspection of the site, through the planning process, to eliminating the risk posed by the two unstable beams) were safely accomplished in 13 hours. The entire cleanup effort, including removing the four main structural beams, cutting them into smaller sections for disposal, removing all the cabling that was holding the canvas tent in place and removing the material from the site, was completed in 4 days.
Enhanced Work Planning Applied
The successful and timely cleanup of the collapsed tent incorporated many tenets associated with Enhanced Work Planning.
In this incident at Y12, Enhanced Work Planning helped transform a 3-week cleanup (under Y12's usual planning process) into a 4-day effort, without compromising worker or environmental safety. In the words of James Stone, Deputy Division Director, Y12 Waste Management Division,
During my years at the site, I can't remember any project that went as well. Enhanced planning maximized the effectiveness of the sixty people involved in the project representing numerous organizations and technical disciplines. We should capture what made this successful and make it a standard part of doing business at Oak Ridge.
Click here to go to the EWP - U.S. Dept of Energy, Office of environment, Safety & Health
|One of the best things we can do is to learn from these types of events. There is plenty of documentation of when things go wrong, but even more important is to show we have learned from the past. As we document successful cases like this, so that others can model to ensure other successful responses in the future.|
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