1. Swiss Federal Nuclear Safety Inspectorate Integrated Oversight An Approach to Systematic Supervision of NPP Safety Dr Peter Flury 31 May 2006

2. 2 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Integrated Oversight Systematic Supervision of Nuclear Safety What is Nuclear Safety?

3. 3 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Nuclear Safety IAEA-Definitions general nuclear safety objective INSAG-12 radiation protection objective technical safety objective Safety Objectives 1.safety nuclear safety radiation safety safety of radioactive waste management safety in the transport of radioactive material 2.non-radiological aspects of safety Draft Safety Guide DS298

4. 4 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Nuclear Safety Swiss Definition nuclear safety =protection of man and environment from radiation hazards due to reactor operation fuel handling fuel storage radioactive waste processing radioactive waste storage transport of radioactive material by technical and organisational means

5. 5 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Structuring information on nuclear safety Basic assumption definition of precautions implementation of precautions nuclear safety

6. 6 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Structuring information on nuclear safety Basic assumption Requirements vs. Operational Experience nominal situation defined in documents actual situation observed in the plant

7. 7 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Structuring information on nuclear safety Additional assumption technical factors human factors organisational factors nuclear safety

8. 8 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) nominal situation defined in documentsactual situation observed in the plant Structuring information on nuclear safety

9. 9 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Perspectives

10. 10 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Defence in Depth Perspective

14. e.g. safety culture, plant risk

15. 15 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Safety Goal Perspective

17. 17 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) 1 scale for all situations from normal operation to major accidents Basis: International Nuclear Event Scale (INES) Extension: Below Scale and Normal Operation Integrated Oversight The scale for assessing nuclear safety

19. Integrated Oversight Inspection Results Every inspection result is assigned to the structure of the nuclear safety assessment system.

20. Integrated Oversight Reportable Events The contributing factors and effects of reportable events are assigned to the structure of the nuclear safety assessment system. 1 event = several rated aspects A A V V

21. 21 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Integrated Oversight Additional data (planned) plant modification proposals periodically reported operational experience (results of periodic testing and checking of systems and components, safety indicators)

22. 22 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate) Safety Assessment Results Goals of Analysis strengths weaknesses

23. Safety Assessment Results Fictitious Example

24. 24 CNRA Workshop 2006-05-31 | Integrated Oversight (Dr Peter Flury, Swiss Federal Nuclear Safety Inspectorate)