Bechtel leads an integrated international team undertaking the complex high-hazard effort to safely confine the highly radioactive Chornobyl reactor that was destroyed in history's worst nuclear accident. A reactor-core meltdown in Unit 4 caused an explosion, a fire, and an enormous release of radioactive material.
The New Safe Confinement will enclose the reactor and related debris for at least a century
Within months of the 1986 disaster, Soviet crews contained the radioactive wreckage inside a temporary shelter, a 21-story-tall "sarcophagus." There were many gaps, and most of the sarcophagus wasn't secured to the underlying structure, leaving the enclosure vulnerable to leaking rainwater, settling, and earthquakes.
In the latter part of the 1990s, after we helped with a short-term fix to stabilize the sarcophagus, a Bechtel-led team designed what's known as the New Safe Confinement (NSC) structure, the heart of a broader, longer-term Shelter Implementation Plan.
About the Confinement Shelter
The $1.3 billion NSC, will enclose the reactor and associated debris—as well as the sarcophagus surrounding it—providing a confined space within which unstable upper portions of the sarcophagus can be taken apart and the remaining highly radioactive material removed to a long-term storage repository. This will reduce exposure of the existing shelter to weather, and minimize the release of radioactive dust that could result from an accidental collapse beneath the new confinement. It will also provide a safe working environment for cleanup personnel.
Tour the shelter (2014)
Click on the controls to get a complete view of the shelter in 2014.
Inside the project
Carrying out the entire Shelter Implementation Plan, the heart of which is the NSC structure, is expected to cost some $2.7 billion. The funding—contributed by more than 40 nations—is managed by the European Bank for Reconstruction and Development (EBRD).
When EBRD was commissioned to manage the Chornobyl recovery funds, its managers agreed with the government of Ukraine to enlist Western experts to help manage implementation.
EBRD and plant officials selected a Bechtel-led consortium that included Battelle Memorial Institute and Electricité de France to lead the project management effort for the Shelter Implementation Plan. Since 1996, the Bechtel group has, among other things:
- Provided conceptual engineering, cost estimating, scheduling, and project management services
- Prepared design and procurement packages
Inside the NSC, a camera-equipped crane system will hang from the arch’s ceiling on a web of cables. Operators in a shielded control room will manipulate hoists, a drill, a jackhammer, and hydraulic shears. These tools will enable them to peel back the sarcophagus roof and sort through its highly radioactive contents.
The structure and the mechanical handling equipment that it supports are all designed to prevent radiological exposure when it becomes operational. In the meantime, our consortium found ways to minimize worker exposure to radioactivity during construction.
- September 1977: First unit of the Chornoybl nuclear power station goes on line.
- April 1986: Nuclear accident and fire in Unit 4 of the Chornobyl station destroys reactor and spreads radioactive contamination across surrounding region.
- 1986–1996: Russian and Ukrainian teams contain damaged reactor within a steel and concrete sarcophagus. The damaged structure is studied and containment scenarios explored.
- 1996–1997: Representatives of the United States, Europe, and Ukraine determine the strategy for remediating the contamination at Chornobyl. The Shelter Implementation Plan results.
- April 1998: Bechtel-led consortium begins a project to stabilize the sarcophagus and develop a long-term containment strategy.
- May 2000: Bechtel-led consortium meets first milestone.
- 2004: New Safe Confinement concept approved.
- 2007: New Safe Confinement design and construction contract awarded.
- 2008: Sarcophagus stabilization completed.
- 2011: Arch component fabrication begins.
- April 2012: Arch erection starts.
- October 2012: Arch cladding commences.
- November 2012: First arch segment lift; auxiliary facilities construction and early civil work begin.
- March 2013: New vent stack construction and completion.
- August 2014: Second arch segment jacked into place.