LOCKIT® – Nuclear Waste Solidification

Fortum’s waste solidification technology (LOCKIT®) enables cost effective solutions for low- and intermediate- level waste solidification. The technology and know-how is a result of over 30 years of operational experiences and continuous development from the Fortum owned Loviisa NPP.

Hazardous waste and detoxification
High volume incorporation of different types of waste

LOCKIT® recipe accommodates up to 60% of waste volume – an international record.

Recycling and waste services
Expert know-how in recipe development

Cementation recipe is tailored according to your waste stream – high boron content does not affect the quality of the solidification product.

Executive Management
Quality control program for your daily solidification operation

We provide comprehensive quality control program and training to ensure the successful operation of your solidification plant.

VLJ luola waste repostpries decommissioning at Loviisa

Fortum's expert knowledge in Waste Solidification

We at Fortum provide solutions for the whole waste lifecycle of an NPP, based on what we also apply ourselves. In our Loviisa NPP, the plant's liquid waste is solidified into cement and packed into concrete waste containers. The solidification is designed to process low- and intermediate-level liquid waste generated during the operation and decommissioning of the two-unit Loviisa plant. This waste primarily consists of ion exchange resins used in the purification of process water as well as sludge from the bottom of the evaporator concentrate tanks and evaporator concentrates. The waste is then taken to the low and intermediate level waste (LILW) repository below the plant site alongside all of the other LILW waste created during the operation and, in the future, decommissioning of the plant.

See more details below on Fortum’s waste related concepts, as well as the services we offer related to solidification, interim storage and different types of repositories (underground and near surface). Contact our experts for further discussion on how we could best assist you handling the waste at your site.

LOCKIT® Solidification

What we do at our own solidification plant in Loviisa

  • The solidification plant is an independent unit and designed to handle all of the liquid waste generated during NPP operation and decommissioning. It also handles the liquid waste originating from interim storage of spent fuel.
  • The solidification matrix is based on cement and blast furnace slags
  • The processes are operated from a control room
  • Main waste streams are ion exchange resins and sludge
  • Waste and binders are dosed and mixed directly in the final disposal package

What makes the LOCKIT® cement matrix special

  • The cement matrix, developed by Fortum, is more than twice as efficient as the traditional matrix
    • Waste content of the solidified product is 40%-60%
    • The cost is practically the same as in traditional cementation
  • The recipe development started in 1980s and it is continuously further developed to optimise the performance of the matrix for new waste fractions
    • Over 50% waste content without diluting the matrix quality
  • The tests of exposing the matrix to underground water have shown that the matrix has not weakened since 2012
  • The solidification matrix is suitable for all types of LILW

Antti Ketolainen

Decommissioning and Waste
Tel: +358 40 751 8956
Antti [dot] V [dot] Ketolainen [at] fortum [dot] com

Nuclear Waste Management

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Fortum offers optimisation of nuclear waste management practises in a numerous areas.

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Storage and Disposal

Radioactive Waste Storages

Safe and reliable storing and final disposal of nuclear waste is the last but pivotal link in compre­hensive radioactive waste management chain. Fortum’s long nuclear utility and waste management organi­zation experience guarantees reliable and cost-efficient waste storing and repos­itory services for other waste management organi­za­tions.

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Storage and Disposal

Radioactive Waste Disposal

As both nuclear power plant and nuclear waste facility licensee and operator, Fortum has unique experience in devel­oping safe and economical disposal solutions for different radioactive waste types.

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NURES® – Liquid Waste Treatment

Customisable solutions for purification of radioactive liquid waste through use of highly selective ion exchange materials.

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BORES® – Liquid Waste Treatment

Customisable solutions for separation of boron from radioactive liquids.

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Fortum’s LILW disposal concept and disposal related engineering services

Basics of the Fortum’s concept

  • LILW disposal facilities are located underground on the NPP site. 
  • Separate spaces for low and intermediate level waste
  • Facility includes both engineered and natural barriers
  • NPP organisation operates the LILW disposal facilities

Key Benefits

  • Minimised effort to get public acceptance through integration with the NPP site
  • Minimised O&M-costs through the NPP site integration and lack of O&M after site closure
  • Minimised occupational exposure through the separated spaces for low and intermediate level waste

Our main offering related to different types of repositories (underground and near surface)

  • Design of a low and intermediate level waste final repository
  • Licencing
  • Cost analysis
  • Safety case: documentation demonstrating the long-term safety of the disposal
  • Operational safety analysis
  • Radiation safety analysis
  • Commissioning services
  • Services related to disposal of spent fuel together with Posiva Solutions