Information on transformation of the Shelter object into an ecologically safe system
Implemented measures on the safe state of the Shelter object

During the period of existence of the Shelter object, a significant amount of work was done to increase the reliability of its structures and systems, to ensure radiation and nuclear safety. The most systematic and large-scale nature of these works was acquired in the framework of the international project "Plan of Measures Implementation at the Shelter project", developed under the cooperation of the Commission of the European Community, Ukraine, the USA and groups of international experts.

In particular, in 2004 - 2008 the works on stabilization of building constructions were carried out. The implemented stabilization measures provide an acceptable level of safety of the Shelter object, based on the 15-year lifetime of stabilized designs (by the end of 2023). The problem of unstable structures should be solved by dismantling them within the NSC.

Threats inside the Shelter object
  • The accumulation of FCM formed as a result of an unplanned accident at power unit No.4 is and will remain the main source of danger for personnel, the population and the environment for many years. By their state and composition, the FCM are long-lived radioactive waste.
  • Some clusters of FCM can be nuclear-dangerous.
  • Uncontrolled state of FCM inside Shelter object.
  • Spontaneous destruction of the surface of paw-shaped FCM with the formation of high-level dust.

In view of the presence inside the Shelter object of 129 fuel assemblies of spent fuel, 48 fuel assemblies of fresh fuel and at least 95% of the destroyed fuel in the FCM in an unspecified state that at this time contain ~ 10 16 Bq of long-lived alpha-emitting radionuclides, lava-like masses the question of further actions to transform the Shelter object requires a thoughtful approach.

Tasks for the nearest period

  • Protection of personnel, population and the environment from the influence of sources of nuclear and radiation hazards related to the existence of the Shelter object.
  • Creation of conditions for realization of practical activity on transformation of the Shelter object into an ecologically safe system, in particular for the removal of remnants of nuclear fuel and fuel-containing materials (FCM), works on the dismantling of unstable structures of the Shelter object and the management of radioactive waste.
  • The creation of the NSC is an extremely important, but not the final step, in transforming the Shelter object into an ecologically safe system.
  • Determination of the final state of the Shelter object remains open and allows for different interpretations, which allows us to consider different scenarios for the transformation of the Shelter object provided that they are substantiated exhaustively.
  • Choosing of course for further actions to transform the Shelter object into an ecologically safe system.
  • Financing of measures to transform the Shelter object into an ecologically safe system.
  • Determination of criteria for the transfer of fuel-containing materials to a controlled state
Factors to consider when solving problems
  • The presence of the NSC with a guaranteed lifetime of 100 years, equipped with a system of main cranes and other technological systems that can be used both during the current operation of the NSC and for the work on the removal and subsequent handling of FCM.
  • The Shelter object is located in a zone of special industrial use that is permanently unsuitable for living.
  • The activity on transformation of the Shelter object is extremely complex and costly.

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