Level 3 PSA - EDF Hinkley Point

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HPC-NNBOSL-U0-000-RES-000028 Version 1.0 Level 3 PSA NOT PROTECTIVELY MARKED { PI removed } Text within this document that is enclosed within curly brackets “{…}” is AREVA or EDF Commercially Confidential Information (CCI) or Personal Information (PI) and has been removed. UNCONTROLLED WHEN PRINTED NOT PROTECTIVELY MARKED Page 2 of 60
HPC-NNBOSL-U0-000-RES-000028 Version 1.0 Level 3 PSA NOT PROTECTIVELY MARKED TABLE OF CONTENTS 1 INTRODUCTION ................................................................................................................. 5 2 BACKGROUND................................................................................................................... 5 3 ASSESSMENT OF INDIVIDUAL RISK ............................................................................... 7 3.1 Identification of Initiating Events for Assessment .......................................................... 8 3.2 Release Category Allocation ............................................................................................. 9 3.3 Assessment of Level 1 PSA Non Core Damage Sequences ........................................ 11 3.3.1 Methodology .................................................................................................................... 11 3.4 Assessment of Level 2 PSA Core Damage Sequences ................................................ 13 3.5 Assessment of Additional Non-core Damage Sequences ........................................... 13 3.6 Combination of Results ................................................................................................... 14 3.7 Calculation of Individual Risk of Fatality ....................................................................... 15 4 ASSESSMENT OF SOCIETAL RISK ............................................................................... 16 4.1 Input Data .......................................................................................................................... 17 4.1.1 Source Terms ................................................................................................................... 17 4.1.2 Meteorological Data ......................................................................................................... 17 4.1.3 Countermeasures ............................................................................................................ 18 4.1.4 Population and Agricultural Data ................................................................................... 18 4.2 Methodology ..................................................................................................................... 18 4.3 Assessment of Frequency of 100 Fatalities................................................................... 19 4.3.1 Early Deaths ..................................................................................................................... 19 5 WORKER RISK ................................................................................................................. 19 5.1 Identification of Faults ..................................................................................................... 20 5.2 Release Category Allocation ........................................................................................... 21 5.3 Results of Worker Risk Assessment against SDO-5 .................................................... 22 5.4 Calculation of Results for SDO-4 Comparison .............................................................. 23 5.5 Worker Cohorts ................................................................................................................ 24 5.6 Results of Worker Risk Assessment against SDO-4 .................................................... 25 5.6.1 Risk of Fatality to Generic Worker from All Accidents ................................................ 25 5.6.2 Risk Assessment for Other Worker Cohort Groups ..................................................... 26 5.6.3 Worker Cohorts - Risk Excluding LOSAs ...................................................................... 27 5.6.4 Worker Cohorts - Risk Including LOSAs ....................................................................... 27 5.6.5 Worker Cohorts – Risk Summary ................................................................................... 28 5.6.6 Effect of Having Two EPR Units on Site ........................................................................ 28 6 REFERENCES AND ABBREVIATIONS ........................................................................... 30 6.1 References ........................................................................................................................ 30 ABBREVIATIONS ........................................................................................................................ 32 UNCONTROLLED WHEN PRINTED NOT PROTECTIVELY MARKED Page 3 of 60
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Level 3 PSA - EDF Hinkley Point

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