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Integrated Oversight An Approach to Systematic Supervision of NPP Safety Dr Peter Flury

Integrated Oversight An Approach to Systematic Supervision of NPP Safety Dr Peter Flury. 31 May 2006. Integrated Oversight Systematic Supervision of Nuclear Safety. What is Nuclear Safety?. Nuclear Safety IAEA-Definitions. INSAG-12. Draft Safety Guide DS298. Safety Objectives. safety

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Integrated Oversight An Approach to Systematic Supervision of NPP Safety Dr Peter Flury

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  1. Integrated OversightAn Approach to Systematic Supervision of NPP SafetyDr Peter Flury 31 May 2006

  2. Integrated OversightSystematic Supervision of Nuclear Safety What is Nuclear Safety?

  3. Nuclear SafetyIAEA-Definitions INSAG-12 Draft Safety Guide DS298 Safety Objectives • safety • nuclear safety • radiation safety • safety of radioactive waste management • safety in the transport of radioactive material • non-radiological aspects of safety general nuclear safety objective radiation protection objective technical safety objective

  4. Nuclear SafetySwiss 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. Structuring information on nuclear safetyBasic assumption definition of precautions nuclear safety implementation of precautions

  6. Structuring information on nuclear safetyBasic assumption Requirements vs. Operational Experience nominal situation defined in documents actual situation observed in the plant

  7. Structuring information on nuclear safetyAdditional assumption technical factors nuclear safety human factors organisational factors

  8. Structuring information on nuclear safety nominal situation defined in documents actual situation observed in the plant

  9. Perspectives

  10. Defence in Depth Perspective

  11. e.g. safety culture, plant risk

  12. Safety Goal Perspective

  13. Integrated OversightThe scale for assessing nuclear safety • 1 scale for all situations from normal operation to major accidents • Basis: International Nuclear Event Scale (INES) • Extension: Below Scale and Normal Operation

  14. Integrated OversightInspection Results Every inspection result is assigned to the structure of the nuclear safety assessment system.

  15. Integrated OversightReportable 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 V A V

  16. Integrated OversightAdditional data (planned) plant modification proposals periodically reported operational experience (results of periodic testing and checking of systems and components, safety indicators)

  17. strengths weaknesses Safety Assessment ResultsGoals of Analysis

  18. Safety AssessmentResultsFictitious Example

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