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A Digital Regional Overpower Protection System for CANDU reactors

UNRESTRICTED. 2. Objectives. Understand current CANDU-6 Regional Overpower Protection (ROP) limitations and challengesIntroduce advantages of digital ROP approach and additional benefits available from fully automated On-Line ROP. UNRESTRICTED. 3. Function. Protect the reactor against overpower i

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A Digital Regional Overpower Protection System for CANDU reactors

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    1. UNRESTRICTED A Digital Regional Overpower Protection System for CANDU® reactors Victor Mihaylov Information and Control Systems Development Division AECL, Chalk River Laboratories

    2. UNRESTRICTED 2 Objectives Understand current CANDU-6 Regional Overpower Protection (ROP) limitations and challenges Introduce advantages of digital ROP approach and additional benefits available from fully automated On-Line ROP

    3. UNRESTRICTED 3 Function Protect the reactor against overpower in reactor fuel: due to either a localized peak while the reactor as a whole remains at normal power or the result of an uncontrolled power excursion due to a Loss-of-Reactivity Control accident.

    4. UNRESTRICTED 4 Recorded ROP events Probability of occurrence of ROP event Summary of recorded ROP events · Spurious Trips 23 · Trips in Anger 6 · ROP Errors/Trip avoidance 117

    5. UNRESTRICTED 5 Targeted improvements Safety and Reliability: continuous self testing minimized human involvement better ROP algorithm Efficiency of reactor operation: operation with less de-ratings (6%) elimination of manual adjustments and testing elimination of spurious trips

    6. UNRESTRICTED 6

    7. UNRESTRICTED 7 I&C Perspective

    8. UNRESTRICTED 8 The small pieces of the puzzle

    9. UNRESTRICTED 9 Current state (CANDU-6)

    10. UNRESTRICTED 10 Semi-Automated ROP

    11. UNRESTRICTED 11 Fully Automated On-Line ROP

    12. UNRESTRICTED 12 Technical advantages of Digital ROP Online self-diagnostics Eliminate analog designs issues: - tolerance in performance - sensitivity to environmental conditions Digital Signal Processing Dynamic Compensation better approximation function not affected by aging of components easy adjustment for the aging of the flux detectors Same platform different ROP algorithms

    13. UNRESTRICTED 13 How can we make it happen? Safety certified: HW COTS (Components Of The Shelf) SW components Development environments Operating systems Networks and communication protocols Development cycle meeting the rigor of the contemporary safety standards

    14. UNRESTRICTED 14 Examples of available COTS IVENSYS - Triconex® RTP® - Distributed Computer Systems Pilz PSS® - Programmable Safety System ESTEREL Technologies VALIDATED SOFTWARE Corporation AECL - ACCISTM

    15. UNRESTRICTED 15 Predicted reduction in ROP events Probability of occurrence of ROP event Summary of recorded ROP events · Spurious Trips 23 · Trips in Anger 6 · ROP Errors/Trip avoidance 117

    16. UNRESTRICTED 16 Benefits Improved safety of operation Increased system reliability Reduced maintenance and operating costs Increased revenue

    17. UNRESTRICTED 17

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