Transactions of the Korean Society of Pressure Vessels and Piping (한국압력기기공학회 논문집)

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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Risk and Sensitivity Analysis during the Low Power and Shutdown Operation of the 1,500MW Advanced Power Reactor

1,500MW대형원전 정지/저출력 안전성향상을 위한 설계개선안 및 민감도 분석

  • 문호림 (한국수력원자력(주) 중앙연구원) ;
  • 한덕성 (한국전력기술(주)) ;
  • 김재갑 (한국전력기술(주)) ;
  • 이상원 (한국수력원자력(주) 중앙연구원) ;
  • 임학규 (한국전력국제원자력대학원대학교)
  • Received : 2019.04.08
  • Accepted : 2019.06.13
  • Published : 2019.06.30
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Abstract

An 1,500MW advanced power reactor required the standard design approval by a Korean regulatory body in 2014. The reactor has been designed to have a 4-train independent safety concept and a passive auxiliary feedwater system (PAFS). The full power risk or core damage frequency (CDF) of 1,500MW advanced power reactor has been reduced more than that of APR1400. However, the risk during the low power and shutdown (LPSD) operation should be reduced because CDF of LPSD is about 4.7 times higher than that of internal full power. The purpose of paper is to analysis design alternatives to reduce risk during the LPSD. This paper suggests design alternatives to reduce risk and presents sensitivity analysis results.

Keywords

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Fig. 1 Schematic diagram for the safety injection system

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Fig. 2 2-Demension diagram for PAFS

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Fig. 3 Diagram for shutdown cooling system during mid-loop operation

Table 1 Comparison of design features between 1,500MW reactor and reference plant

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Table 2 Definition of POSs

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Table 3 LPSD CDF contribution by POSs

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Table 4 Sensitivity analysis for automated isolation of CVCS

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Table 5 Sensitivity analysis for automated safety injection

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Table 6 Sensitivity analysis for automated safety injection

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Table 7 Sensitivity analysis for external injection of coolant

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