EPRI Reports on Probabilistic Risk Assessment Models
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Questions and Answers

What is the main focus of EPRI Report 1013492?

  • Treatment of parameter and model uncertainty
  • Guidance on risk-informed decision making
  • Practical guidance on the use of risk assessment
  • Probabilistic risk assessment models (correct)
  • Which EPRI report provides practical guidance on the use of probabilistic risk assessment?

  • EPRI Report 1013492
  • EPRI Report 1016737
  • EPRI Report 1026511 (correct)
  • None of the above
  • Where can you find NUREG-1855 for guidance on uncertainties in risk-informed decision making?

  • EPRI website
  • NRC website (correct)
  • External websites
  • None of the above
  • What is the primary objective of the course mentioned in Slide 2A?

    <p>To give a high-level understanding of NUREG-1855 and EPRI reports</p> Signup and view all the answers

    Which report focuses on the treatment of parameter and model uncertainty in probabilistic risk assessments?

    <p>EPRI Report 1013492</p> Signup and view all the answers

    What distinguishes NUREG-1855 from the EPRI reports?

    <p>It offers treatment of uncertainties in risk-informed decision making</p> Signup and view all the answers

    What type of risk-informed activities are outside the scope of the report?

    <p>Non-risk-informed activities</p> Signup and view all the answers

    In what scenario does the detailed approach in NUREG-1855 NOT apply?

    <p>Evaluation of risk at the time of an event</p> Signup and view all the answers

    Which regulatory guidance indicates a possibility for a NOED under certain circumstances?

    <p>10 CFR 50.69</p> Signup and view all the answers

    When is the detailed approach in NUREG-1855 generically applicable?

    <p>For all risk-informed activities</p> Signup and view all the answers

    Which activity would result in a 'no' answer for the criterion under discussion?

    <p>Component risk ranking</p> Signup and view all the answers

    What triggers the exclusion of non-risk-informed activities from the report's scope?

    <p>'Type of risk-informed activity evaluation'</p> Signup and view all the answers

    What is the main reason for assigning an uncertainty distribution to the frequency estimate of very large earthquakes?

    <p>To account for the lack of data due to the rare occurrence of very large earthquakes</p> Signup and view all the answers

    What is an example of a model uncertainty, according to EPRI 1026511?

    <p>The different models used to predict core melt progression</p> Signup and view all the answers

    Which of the following is NOT a reason for model uncertainties?

    <p>Differences in data collection methods</p> Signup and view all the answers

    What is the main cause of model uncertainties, according to the text?

    <p>Limited understanding of the phenomenon being modeled</p> Signup and view all the answers

    What is a fundamental difference between the MELCOR and MAAP models?

    <p>All of the above</p> Signup and view all the answers

    What is the main reason for limited understanding of the physics involved in some phenomena?

    <p>Limited understanding of the phenomenon being modeled</p> Signup and view all the answers

    What should be considered when combining the results from different hazards and plant operational states?

    <p>The exact level of detail used in each analysis</p> Signup and view all the answers

    Which hazards may have a significantly higher level of conservative bias in their PRA models?

    <p>All of the above</p> Signup and view all the answers

    How does the level of modeling vary within a hazard such as an internal event, at-power PRA?

    <p>It varies based on the level of detail used in different evaluations</p> Signup and view all the answers

    What can lead to a conservative time estimate for providing a means for alternate room cooling?

    <p>Evaluating room cooling and equipment failure thresholds conservatively</p> Signup and view all the answers

    What can be modeled to a level of detail sufficient to prove they are not important to the results in the analysis of other hazards?

    <p>Low-risk sequences</p> Signup and view all the answers

    What is considered a more conservative evaluation in defining the onset of core damage for a boiling water reactor?

    <p>Defining the onset of core damage for a boiling water reactor occurring at core uncovery</p> Signup and view all the answers

    What is the main focus of the staff's assessment in Regime 2?

    <p>Ensuring the application PRA risk metric results do not challenge the acceptance guidelines</p> Signup and view all the answers

    How does the staff approach peer review findings in Regime 2?

    <p>With a higher degree of scrutiny than Regime 1</p> Signup and view all the answers

    What does the staff look for in an assessment in Regime 2?

    <p>An assessment that shows the state-of-knowledge correlation does not affect the risk metric results of the PRA</p> Signup and view all the answers

    What is the staff's approach to evaluating the application in Regime 2?

    <p>Ensuring the proposed performance monitoring is appropriate and adequate for the application</p> Signup and view all the answers

    What is the staff's approach to detecting degraded performance in Regime 2?

    <p>Ensuring degraded performance can be detected in a timely fashion</p> Signup and view all the answers

    What is the staff's approach to monitoring the validity of the assumptions made in the application PRA in Regime 2?

    <p>Ensuring the validity of the assumptions made in the application PRA will be appropriately monitored via the implementation of specific measures and criteria</p> Signup and view all the answers

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