Severe Accident Analysis: Phenomenology and Computational Tools

                                                         Minimum number of Participants: 7

Lecturers and Code Instructors: R. Martin (BWXT), W. Giannotti (NINE), R.Sanders (AREVA)

 

                                                      Day 1

  • SA History and its relevance in safety analysis
    • Short review of main historical severe accidents
    • Development of SA analysis approach in safety analysis
    • Current relevance of the SA analysis
  • Phenomenology review
    • In-vessel event progression (BWR/PWR)
    • Ex vessel phenomena (PWR/BWR)
    • CANDU and fuels channel reactor
    • Special issue: SFP phenomena (loss of coolant, loss of cooling).

 

                                                      Day 2

  • SA analysis methodologies (deterministic, probabilistic, …..)
  • Severe accident licensing
    • IAEA
    • Other organization (WENRA…)
    • Countries legislation
  • Severe accident codes (description and comparison)/1
    • System codes
      • SCDAP
      • MELCOR
      • MAAP
    • Containment codes
      • Gothic
      • Cocosys
      • Smart
  • Exercises:
    • Melcor application (vessel and core simulation)
    • SCDAP application (vessel and core simulation)
    • Nodalization, models set up and comparison of results

 

                                                      Day 3

  • Severe accident codes (description and comparison)/2
  • Containment integrity
    • Short term and long term actions
    • Preventive actions in modern plant
    • Mitigate actions in modern plant
  • Uncertainty analysis for severe accidents
  • Exercises:
    • Melcor application (containment simulation)
    • Gothic application (containment simulation)
    • Nodalization, models set up and comparison of results

 

                                                      Day 4

  • Experimental tests for SA and code qualification
  • RadioNuclide (RN)release and source term
    • Code models
  • Exercises:
    • Melcor application (RN release or ex vessel phenomena simulation or Spent Fuel Pool accident)
    • MAAP application (RN release or ex vessel phenomena simulation or Spent Fuel Pool accident)
    • Nodalization, models set up and comparison of results

 

                                                      Day 5

  • Example of codes applications results
  • How to perform a SA analysis step by step: user and regulatory authorities point of view
    • Needed data
    • Code selection
    • Nodalization detail and qualification
    • Code running requirement
    • Results evaluation and verification
  • Evaluation and Closure of the Training Course

 

 

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