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Evaluation of Shutdown Risk Using FT-FREE Risk Monitoring Function

  • Kazuo Sakuramoto
  • Koichi Miyata
  • Shigeatsu Tomizawa
Conference paper

Abstract

In Japan, it is specified by law that most of systems of nuclear plant must be maintained periodically during refuelling outage. Shortening of shutdown length has been pursued for the purpose of improvement in operating ratio (shorter period of Japanese BWR shutdown: 30–40 days). In order to realize higher operating ratio, Japanese nuclear utilities need to make efforts of rational shutdown management considering risk with changing configuration. In 2002, TEPCO SYSTEMS Corp. improved FT-FREE [1] by addition of risk management function as a user-friendly tool for workers in nuclear power plant.

In this study, the authors organized problems and assumption associated with models of BWR5 plant configured in risk monitor, by comparing risk monitor with detailed shutdown PSA and verifying its accuracy.

Keywords

Binary Decision Diagram Probabilistic Risk Assessment Water Level Decrease Plant Configuration Probabilistic Safety Assessment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    “Development of Safety Management Support Tool Using FT-FREE “, pp290, PSA2002, 2002Google Scholar
  2. 2.
    “Safety Goals for the Operations of Nuclear Power Plants; Policy Statement”, Federal Register, Vol.51, No.149, USNRC, 1986Google Scholar
  3. 3.
    “Use of Probabilistic Risk Assessment Methods in Nuclear Regulatory Activities; Final Policy Statement”, Federal Register, Vol.60, No.158, USNRC, 1995Google Scholar
  4. 4.
    “An Approach for Using Probabilistic Risk Assessment in Risk-informed Decisions on Plant-specific Changes to the Licensing Basis”, USNRC, Regulatory Guide 1.174 rev1, 2002Google Scholar
  5. 5.
    “Development of Shutdown Probabilistic Safety Analysis(PSA) /Shutdown Equipment Out Of Service(EOOS) for River Bend Station”, EPRI, TR-113084, 1999Google Scholar
  6. 6.
    “Introduction of risk informed regulation in Japan”, Nuclear Safety Commission of Japan, 2003 (in Japanese)Google Scholar
  7. 7.
    “A Procedure Guide for Probabilistic Safety Assessments of Nuclear Power Plants during Shutdown Condition: 2002”, Atomic Energy Society of Japan, 2002 (in Japanese)Google Scholar
  8. 8.
    “Very Large Nuclear Risk Models and Binary Decision Diagrams”, pp80, PSA2002, 2002Google Scholar

Copyright information

© Springer-Verlag London 2004

Authors and Affiliations

  • Kazuo Sakuramoto
    • 1
  • Koichi Miyata
    • 1
  • Shigeatsu Tomizawa
    • 1
  1. 1.TEPCO SYSTEMSTokyoJapan

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