MURRG, 다수기 PSA 규제검증 기술개발 사업단

Kyung Hee University

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2018 Research Methods

  • Objective

    Kyung Hee University, which is the fourth branch, is developing or improving the single-unit Level 1 PSA model for regulatory verification which is to be the enabling technology of the SRA model and the verification technology of inter-unit interactions, and radiation accident consequence evaluation and independent verification to support Level 3 PSA.

  • Development of single-unit Level 1 PSA model (Regulatory purpose)

    The single-unit PSA models have been developed such that they can maintain the unique features of the MPAS(Multi-Purpose Analysis Safety: Regulatory-purposed PSA models). In addition, the developed PSA models include design updates, introduction of digital I&C, and use of specific/generic data to effectively enhance the nuclear regulatory activities.

    On the other hand, the seismic PSA that was not covered by the MPAS model has been developed, and ET(Event Tree) and FT(Fault Tree) for level 2 PSA was implemented to support the multi-unit PSA models.

    As a part of the fundamental researches on the multi-unit PSA, we are focusing on the dependency such as common cause failures and dynamic approaches to capture functional interaction.

  • Consequence analysis and verification for L3 PSA model development support

    The L3 PSA is based on a variety of input variables with high uncertainty such as radiation source-term, meteorological data, population distribution, sheltering and evacuation.

    We recognize the need for verification of the results of the L3 PSA and conduct verification studies of the L3 PSA through deterministic methods.

  • Evaluation and verification of radioactive material dispersion using 3D atmospheric dispersion model

    There is a growing need for the use of the latest 3D atmospheric dispersion models as the 1D atmospheric diffusion model, which has been widely used as an atmospheric dispersion model in the nuclear field.

    We are evaluating Fukushima case using 3D atmospheric dispersion evaluation program, developing evaluation manual to evaluate domestic nuclear accident and comparing with other atmospheric dispersion models.

Research Results

  • Research on the multi-unit initiating event

    Analysis of Technical Status for Multi-unit Risk Assessment in NPPs, Nuclear Engineering and Technology, Vol. 50, No. 3, pp. 319-326, 2018

  • Technical reports

    Application of Dynamic PSA for Multi-unit Risk Evaluation

    Expert Judgment on inter-unit common cause failure (TBD)

    Development of Level 1 PSA models (TBD)

    Atmospheric dispersion model comparison (TBD)

Expected effectiveness

  • Support nuclear regulatory direction by evaluating the risk analysis with deterministic requirements, and safety enhancements under PSA legislation.
  • Integrate the probabilistic regulatory approaches with the existing deterministic framework to enhance the safety insight of nuclear power plants.
  • Construct the international cooperation among regulatory agencies to secure technological capability.

Researcher profile

  • E-mail
  • Tel.031-201-3593

Gyunyoung Heo

  • Career

    Ph.D, KAIST (2004)

    Professor, Kyung Hee University (2007-Present)

    Secretary, Korean Nuclear Society (2011)

    Expert Committee, Presidential Advisory Council on Science & Technology (2017)

    Expert Committee, Public Engagement Commission on Spent Nuclear Fuel Management (2014-2015)

  • E-mail
  • Tel.031-201-2560

Kwangpyo Kim

  • Career

    Ph.D, University of Florida (2005)

    Professor, Kyung Hee University (2007~Present)

    National Cancer Institute research fellow (2006-2008)