DS397 Saf Use Mod RRs with NUSSC comments 18-06-2010

3.6. The proposal for the classification and categorization of modifications and utilization,including the approval route should be submitted to the safety committee and after approvalby the reactor manager the proposal should be submitted to the regulatory body for reviewand approval.CATEGORIZATION PROCESS3.7. A more detailed and comprehensive safety assessment should be carried out for thoseexperiments or modifications with a classification having potential impact on safety. Theresult of the detailed safety analysis should indicate the extent of safety implication, see paras3.9–3.25. The safety analyses for the utilization could be incorporated in the safety analysisreport of the research reactor or might be described in a separate safety analysis report. Anexample of a safety analysis report for an experiment is presented in Annex II.3.8. New experiments should be subjected to the categorization process.3.9. For repetitive experiments it should be proven that they can utilize earlier approvedsafety analyses.3.10. For the determination of the potential effect on safety, the consequences on the reactorand the relation with other systems should be taken into account too.3.11. The following aspects should be taken into account for the final categorization of theutilization or modification project and for the determination of the safety analyses to beperformed and the documentation to be prepared:– Major safety significance: modifications or new experiments, which:o could affect the design function or its ability to perform its design function asdescribed in the safety analysis or safety analysis report;o are beyond the licence conditions or beyond the approved safety analysis report 9 ;o could introduce hazards, which are not earlier addressed.– Significant effect on safety: modifications or experiments, which are within theapproved licence, safety analysis and safety analysis report but which requiresadaptation of the operational limits and conditions 10 or which need an adaptation ofthe safety related operating procedures.9 A modification beyond the licence or beyond the approved safety analysis report are implicitly also beyond theoperational limits and conditions.10 Guidance on operational limits and conditions is provided in Ref.[11].11