The Government of the Slovak Republic adopted the pledge to shut down units of V1 NPP, gradually, Unit 1 in 2006 and Unit 2 in 2008.

The first step of documentation preparation for V1 NPP decommissioning was the elaboration of the Conceptual Plan of V1 NPP Decommissioning in 2002 and its update in 2006. The plan should provide general technical and financial information about selected possible and reasonably executable alternatives of decommissioning, which are in compliance with Slovak legislation, in order to prove in this way that decommissioning process will be technically executable and, most of all, appropriate from the point of view of protection of health, nuclear and radiation safety, physical protection and preservation of environment.

The main characteristic of Alternative 1 is decommissioning of reduced range of existing construction objects from object composition of V1 NPP by immediate and continuous disassembly of facilities and technological units, demolition of construction objects up to the bottom of the shaft and preparation of locality for construction of new nuclear source.

In Alternatives 2 and 3 a wider composition of construction objects is presupposed to be decommissioned to achieve unlimited locality utilization, however, construction objects will be demolished only up to elevation -1 m. The whole decommissioning process is divided into two stages (for Alternative IDO) and into three stages (for Alternatives SES and RSE), which represent specific areas of decommissioning.

Both units of V1 NPP will be put out of operation and the final shutdown of Unit 1 and Unit 2 is planned by the end of 2006 and by the end of 2008, respectively. Then period of operation enclosure will follow. During this period all the fuel will be taken away from unit and, consequently decontamination of the primary circuitis carried out, after which the whole primary circuit is drained and dried. Remaining part of operational radioactive waste is processed and the other necessary preparation activities for decommissioning are performed. During enclosure of operation, documentation necessary for Stage I of decommissioning will be prepared an approved. Period of NPP operation enclosure is finished by taking fuel away from storing pool to intermediate storage of spent fuel and by issuing the permit for decommissioning by authorized Slovak bodies. It is supposed that permit for decommissioning will be issued by ÚJD SR by the end of 2011 and decommissioning itself would start in 2012.

With regard to the range of decommissioned technological facilities and objects and with regard to specific conditions of decommissioning, activities related to V1 NPP decommissioning will be substantially time demanding. Also when all the available technical resources for decontamination, disassembly, demolition and treatment of radioactive waste are used and optimal manner of their employment is applied, complete decommissioning will last for period of 14-22 years.

The highest annual amounts of collective equivalent dose are achieved in the period of years 2016 to 2022 for alternatives IDO and RSE. This period includes a large scale of manipulations with contaminated and activated facilities, decontamination activities and treatment of RAW.

Radiation impact of individual alternatives of decommissioning on environment is expressed by radioactivity of gaseous and liquid releases, which result from performed computations. In general, radioactivity of releases from V1 NPP decommissioning is much less than that during the energy operation. Estimated maximal value of annual radioactivity of liquid releases represents about 13.8% and the respective value of gaseous escapes represents 0.23% of the corresponding measured annual values for energy operation.

It will be possible to process (treat) a substantial part of radioactive waste from decommissioning by technological means which are in locality Bohunice. It is supposed that capacity of surface regional storage in locality Mochovce is extensible for all the treated waste from V1 NPP decommissioning, which can be stored in this storage. Moreover, as addition to RAW acceptable for NRWR Mochovce, a certain number of filament-concrete containers with high active RAW will originate, storage of which will be possible only after construction of appropriate, for example underground geological storage.

Execution of arbitrary of considered alternatives will demand substantial resources. Carried out estimation of expected overall expenses shows that the difference between the lowest amount of overall expenses on decommissioning (Alternative RSE: 15.44 billion Sk) and the highest amount (Alternative IDO: 17.62 billion Sk) is 14.2% from the amount of the lowest overall expenses. Total expenses are computed using the unit labor expenses and unit overhead costs specific for conditions in Slovak Republic.

Selection of optimal alternative of V1 NPP decommissioning, made on the base of multicriteria comparison of analyzed alternatives, has character of a recommendation only. The final and real selection of alternative of V1 NPP decommissioning will be made later on the base of this FPD and elaboration of Report on Evaluation of Impact of V1 NPP Decommissioning on Environment according to law No.127/1994 L.D. and on the base of its submission and appreciation at Ministry of Environment of SR.

The funding of the preparatory activities for the operation termination and decommissioning of V1 NPP in Jaslovské Bohunice has been provided from the Bohunice International Decommissioning Support Fund (BIDSF).