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Initiating Event Analysis

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Initiating Event Analysis

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    1. Initiating Event Analysis Workshop Information Purpose: To present and explain the Initiating Events (IE) Analysis Task Learning objectives: To get an global overview of IE Analysis Task within PSA Tasks framework, to understand IE Analysis Task objectives and IE concept, to be aware of IE identification approaches, to have a view of grouping criteria and to know the most usual IE examples and typical mistakes Duration: 1 [hr] Resources: screen, video projector, PC, PowerPoint 2000 Purpose: To present and explain the Initiating Events (IE) Analysis Task Learning objectives: To get an global overview of IE Analysis Task within PSA Tasks framework, to understand IE Analysis Task objectives and IE concept, to be aware of IE identification approaches, to have a view of grouping criteria and to know the most usual IE examples and typical mistakes Duration: 1 [hr] Resources: screen, video projector, PC, PowerPoint 2000

    2. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 2 Context of Initiating Event Analysis This slide will be used by the lecturer to explain the context of the Initiating Event Analysis Task and its relationship with other previous activities This slide will be used by the lecturer to explain the context of the Initiating Event Analysis Task and its relationship with other previous activities

    3. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 3 Initiating Event Analysis The lecturer can set same examples of world-wide well known Initiating Events as Reactor Trip, LOOP, etcThe lecturer can set same examples of world-wide well known Initiating Events as Reactor Trip, LOOP, etc

    4. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 4 Selection of Initiating Events The purpose of this slide is to indicate the different sources available for the identification of Initiating Events. The lecturer will can enlarge on the different approaches setting examples. It is also important to explain clearly the difference between internal events and external events.The purpose of this slide is to indicate the different sources available for the identification of Initiating Events. The lecturer will can enlarge on the different approaches setting examples. It is also important to explain clearly the difference between internal events and external events.

    5. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 5 Assessment of Safety Functions and System Requirements The purpose of this slide and the next one is to explain how to group the initiating events identified previously in order to get a list of initiating events. The main rules for grouping the initiating events should be clearly explained:same demands on safety functions and system requirements, the same success criteria, etc.The purpose of this slide and the next one is to explain how to group the initiating events identified previously in order to get a list of initiating events. The main rules for grouping the initiating events should be clearly explained:same demands on safety functions and system requirements, the same success criteria, etc.

    6. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 6 Grouping of Initiating Events

    7. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 7 Safety Functions and Corresponding Front Line Systems

    8. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 8 Examples of Front Line Systems for a PWR

    9. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 9 Example of Front Line Systems and Support System Dependences for a PWR Plant The lecture should explain the purpose of the development of a dependency matrix for this TaskThe lecture should explain the purpose of the development of a dependency matrix for this Task

    10. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 10 Example of Grouping of Initiating Events

    11. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 11 Example of Initiating Event Grouping for a Candu Nuclear Power Plant

    12. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 12 Example of Initiating Event Grouping for a Candu Nuclear Power Plant

    13. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 13 Example of Initiating Event Grouping for a Candu Nuclear Power Plant

    14. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 14 IE Mutually Exclusive Criteria The lecturer must emphasise the importance of defining mutually exclusive initiating event groups to avoid the typical quantitative mistakes of double counting the same event or not taking into account the contribution of events within gaps. Impact on final risk quantification should be explainedThe lecturer must emphasise the importance of defining mutually exclusive initiating event groups to avoid the typical quantitative mistakes of double counting the same event or not taking into account the contribution of events within gaps. Impact on final risk quantification should be explained

    15. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 15 Example of NPP with 2 Feedwater Trains This example of estimation of initiating event group can be substituted by any other similar didactic examplesThis example of estimation of initiating event group can be substituted by any other similar didactic examples

    16. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 16 Typical Under - Estimation Mistakes Examples of typical underestimation of initiating event frequency should be providedExamples of typical underestimation of initiating event frequency should be provided

    17. IAEA Training Course on Safety Assessment of NPPs Assist Decision Making 17 Typical Ranges of Initiating Events The lecturer should explain that frequencies of different initiating event groupings do not have to be of the same order of magnitude. It has to be emphasised that events of lower frequencies can have higher impact on plant risk due to the greater impact on system unavailability or higer demand on systems to perform required safety functionsThe lecturer should explain that frequencies of different initiating event groupings do not have to be of the same order of magnitude. It has to be emphasised that events of lower frequencies can have higher impact on plant risk due to the greater impact on system unavailability or higer demand on systems to perform required safety functions

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