engleski

Specifying Terms of Reference for the Revision of the NPP Krško Decomissioning Plan

First decommissioning plan for the Krško NPP was based on a study prepared by NIS Ingenieurgesellschaft mbH in 1996. Five years later, the NPP contracted with the Croatian Hazardous waste management agency, APO d.o.o., a project to identify decommissioning program options and specify the terms of reference (TOR) for the first revision of the plan. A general requirement on the project was to arrive at the TOR in a transparent and well documented way which would initiate "a clear and controlled process for an integrated strategic review of the plan", as recommended by the IAEA supported workshop on the NPP decommissioning held in 2000. Also, a number of specific items noted at the workshop should be improved. The results of the first phase of the APO project were described in a report with two major chapters: (a) Context of the Krško NPP decommissioning which determines decommissioning program options by defining input parameters, options and assumptions, sets requirements on calculation and other outputs, and outlines a framework for decommissioning strategies evaluation ; and (b) Questionnaire intended to facilitate and document the responses from the NPP stakeholders to the proposed decommissioning context description, which should be obtained in the second project phase. The Context would then be modified to reflect the views of the stakeholders, in particular a set of evaluation criteria would be established according to their responses, and finally TOR would be specified as a stand-alone document. In the last phase, the work should be independently reviewed and commented upon (IAEA supported workshop, the NPP, etc.). The preliminary report on the first project phase was distributed to the IAEA expert mission scheduled to support a workshop on TOR preparation in June 2001, and to the prospective participants. It was then agreed that the parties participating at the Workshop 2001 would be taken to represent the NPP decommissioning stakeholders. However, the APO proposal that the stakeholders' views be documented as responses in the Questionnaire was not adopted. Instead, the participants have agreed to directly consider the Context item by item. The only hard negotiations were held about decommissioning duration options. Finally, it was predominantly agreed that the original SID strategy would be supplemented with two shorter variants (15 and 30 years, respectively). APO has completed TOR specification based on the workshop discussion and conclusions. For the revision of the decommissioning plan, much more elaborate description and costs estimates of spent fuel and radioactive waste management and disposal should be provided (the latter involving ARAO and APO site specific work). Three SID variants would increase confidence in the adequacy of funding provisions. But these would not be new independent strategies for which evaluation criteria should be established and used. However, the Questionnaire methodology for evaluation of decommissioning options may yet become useful in the future, especially if the Krško NPP is going to be decommissioned jointly by the republics of Slovenia and Croatia, providing a transparent approach to arrive at a rational and generally acceptable decommissioning strategy

Decomissioning plan/NPP Krško; decommissioning strategy; evaluation criteria/Radioactive Waste

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