Nuclear Engineering and Technology

  • 제53권2호
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  • Pages.386-392
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  • 2021
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Performing a multi-unit level-3 PSA with MACCS

  • Bixler, Nathan E. (Sandia National Laboratories) ;
  • Kim, Sung-yeop (Korea Atomic Energy Research Institute)
  • 투고 : 2020.04.02
  • 심사 : 2020.07.25
  • 발행 : 2021.02.25
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초록

MACCS (MELCOR Accident Consequence Code System), WinMACCS, and MelMACCS now facilitate a multi-unit consequence analysis. MACCS evaluates the consequences of an atmospheric release of radioactive gases and aerosols into the atmosphere and is most commonly used to perform probabilistic safety assessments (PSAs) and related consequence analyses for nuclear power plants (NPPs). WinMACCS is a user-friendly preprocessor for MACCS. MelMACCS extracts source-term information from a MELCOR plot file. The current development can combine an arbitrary number of source terms, representing simultaneous releases from a multi-unit facility, into a single consequence analysis. The development supports different release signatures, fission product inventories, and accident initiation times for each unit. The treatment is completely general except that the model is currently limited to collocated units. A major practical consideration for performing a multi-unit PSA is that a comprehensive treatment for more than two units may involve an intractable number of combinations of source terms. This paper proposes and evaluates an approach for reducing the number of calculations to be tractable, even for sites with eight or ten units. The approximation error introduced by the approach is acceptable and is considerably less than other errors and uncertainties inherent in a Level 3 PSA.

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참고문헌

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피인용 문헌

  1. Application of the RODOS decision support system for nuclear emergencies to the analysis of possible consequences of severe accident in distant receptors vol.167, 2021, https://doi.org/10.1016/j.anucene.2021.108837