Comprehensive Decommissioning International (CDI) is backed by decades of experience through its corporate parents, Holtec International and SNC-Lavalin.
Holtec clients span the globe; over 116 nuclear plants rely on Holtec’s Dry Storage technology for their storage and transportation needs. Holtec’s wet and dry storage and transport systems provide confinement, radiation shielding, structural integrity, criticality control, and heat removal for used nuclear fuel. Holtec remains the world leader in wet spent nuclear fuel storage technology design and implementation and has supplied over $3B of nuclear power plant components since the late 1980s.
SNC-Lavalin (SNCL) brings significant U.S. decommissioning expertise in both commercial and government markets. This expertise includes the management team that led the baseline planning, license transfer, project delivery through fuel transfer, and reactor segmentation at the Zion station. This team also managed the UK’s fleet of 22 Magnox reactors through operation and into decommissioning. More recently we’ve enjoyed success progressing cleanup efforts at Fukushima Dai-Ichi in Japan, Ringhals Units 1&2 in Sweden and the Nuclear Power Demonstration (NPD) reactor in Canada.
Vermont Yankee, USA
To support decommissioning of the Vermont Yankee Nuclear Plant, Entergy Nuclear signed a contract with Holtec to expeditiously defuel the Vermont Yankee (VY) spent fuel pool. The overall project scope included construction of a second ISFSI pad, security expansion, engineering, licensing, manufacturing, delivery and loading of 45 HI-STORM cask systems, all on a turnkey basis.
In just over 3 ½ years from plant shut down, VY’s spent fuel pool was completely defueled (i.e., no spent fuel assemblies remain in the pool) setting a new benchmark in the industry. The last cask containing the remaining 39 spent fuel assemblies was safely placed on the ISFSI pad at 11:22PM (EST), August 1, 2018, well ahead of the project schedule. A total of 2,996 spent fuel assemblies were loaded into the dry storage canisters. The final ISFSI pad now contains a total of 58 HI-STORM systems of which 13 were loaded by VY while the plant was still operating and the remaining 45 casks were loaded after the plant shutdown.
Use of Holtec’s patented MPC-68M canister technology, featuring the Metamic-HTTM fuel basket, allowed for NRC’s approval of loading into dry storage canisters, spent fuel with as little as 2 years cooling time. Safe and early defueling of the spent fuel pool paves the way for decommissioning of the VY plant.
Fukushima Dai-ichi, Japan
At Fukushima, SNCL deployed water treatment technologies, dewatering solutions, and new storage/disposal canisters to support decommissioning. Water being processed consists of sea water used to cool the damaged reactor and ground water that has leaked into the basements of the damaged reactors. The addition of seawater added complexity to cleanup. At the time, historic knowledge of radiochemistry had been based on nitrate (fuel reprocessing), not chloride (from sea water). Chloride has a big influence on nuclide speciation. Time sensitive research and testing was conducted in efforts to predict the behavior of nuclides in chloride. Initial emergency responses were highly effective in controlling high radiation dose in water by removing cesium. The liquid waste processing (LWP) systems were modified after numerous laboratory and bench scale testing that focused on creating new media that targeted specific nuclides. The systems have a throughput of greater than 2,100 m3of water per day. These systems are still in operation to date, meeting process requirements including the removal of over 62 nuclides; creating non-detect levels. (Levels below World Health Organization drinking water standards).
Ringhals Units 1&2, Sweden
Vattenfall and Uniper own the Ringhals sites, located south of Gothenburg in the Varberg Municipality. Vattenfall announced that both Ringhals Units 1; a Boiling Water Reactor (BWR), and 2; a Pressurized Water Reactor (PWR) shall cease operations in 2020 and 2019, following an economic review. Vattenfall commissioned SNCL to undertake an in-depth verification of the current decommissioning baseline and in doing so generate a Cost Estimate Summary Report, supported by a new detailed preliminary schedule that could be evolved into the first fully executable plan for the site. To execute these works, Vattenfall and SNCL entered into a collaborative framework, creating an environment of sharing, challenge and collective knowledge to realize the benefits of site knowledge in combination with global experience. SNCL deployed subject matter experts from both the UK and US to deliver this commission.
Zion Nuclear Power Station, USA
Many current Atkins/SNC-Lavalin employees were part of the original team to transition ownership and start the decommissioning of Zion including the General/Project Manager, and executive Management team. Early activities included working with Exelon on the License Transfer Application, a prompt DECON PSDAR, and numerous other licensing activities associated with reconfiguring the security, fire protection, and QA plans. This initial team placed all major procurements for reactor vessel segmentation, rail upgrades, electrical reconfiguration, access to containment, hiring of craft workers, and performed all characterization work.
Big Rock Point Nuclear Power Plant, USA
Consumers Energy awarded one of SNCL’s legacy companies (BNFL Inc.) a contract for major component removal at the Big Rock Point restoration project in Charlevoix, Michigan. BNFL’s scope included the removal of all primary system components including the Reactor vessel and decontamination/demolition of the Radioactive Waste Building and the Alternate Shutdown Building.
Magnox Reactor Fleet, UK
ATK Energy EU Ltd (a UK subsidiary of SNCL), together with its legacy subsidiaries held the contracts and licenses to operate, defuel, and decommission 22 Magnox nuclear power reactors at 10 geographically dispersed sites (904 acres comprising 1,000 buildings and 10M ft2 of floor space, including reactor buildings, turbine halls, spent fuel storage ponds and handling facilities, waste management facilities, and ancillary buildings/infrastructure). This work was performed on behalf of the Nuclear Decommissioning Authority (NDA), a UK Government entity similar to DOE Environmental Management (EM) in mission and purpose.
University of Alberta SLOWPOKE-2 Facility, Canada
Between 2016 and 2018 SNC-Lavalin successfully decommissioned and decontaminated the University of Alberta SLOWPOKE-2 Facility (UASF) located in Edmonton, AB. The decommissioning of the UASF has been completed. The space occupied by the facility is deemed to be suitable for unrestricted use, and it is expected to be confirmed by the CNSC by revoking the current operating license. The decommissioning activity included concrete blocks removal, the dismantling and removal of the reactor and auxiliary components, removal of contaminated areas from pool floor by intrusive methods, the HEU core and radioactive waste were transferred into its dedicated containers for shipment to the licensed facilities for final storage. The final radiological survey was performed in the reactor pool, in the exhaust ventilation system, and in the facility rooms affected by decommissioning work.
CANDU Reactor Life Extension Projects – Korea, Canada, Argentina
Since 2007, SNC-Lavalin has been successfully refurbishing units in the global CANDU® reactor fleet to extend their useful life. The company has developed and deployed the highly automated remote tooling systems used to remove, volume reduce, and transport the highly radioactive reactor core components. We also designed and constructed on-site facilities to safely store the removed highly radioactive reactor core components. When completed, the life of the CANDU reactor is doubled. To date, four units have been refurbished in Ontario, New Brunswick, and Korea. Two projects are currently being executed by SNC Lavalin to refurbish four reactor units in Ontario and one reactor unit in Argentina. SNC-Lavalin has recently been awarded a further project commitment to refurbish an additional six reactors in Ontario over the next twelve years.
US Government Projects
Through its subsidiaries (including joint venture companies) SNCL has performed over 100 waste cleanup, decommissioning and site remediation projects for the US Department of Energy and the US Department of Defense. SNCL’s portfolio contains site management, engineering and services supply for work including:
- Decommissioning and site closure plan development,
- Historical Site Assessments and D&D cost estimation,
- Providing radiation protection and radioactive waste staff and expertise,
- Characterization of environment, facilities, and components,
- Remediation operations, including decontamination, demolition, and debris/soil removal, packaging, transportation, and disposal,
- Large component removal, engineering, licensing activities, transportation, processing, and disposal,
- Operation of onsite waste management and volume reduction activities,
- On-site bulk assay for demolition debris and rubble,
- Cleanup of sites to end-point criteria; final status surveys to allow for unrestricted release; implementation of MARSSIM guidelines,
- Site restoration