Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Combustion Characteristics Analysis of a Non-class 1E Cable for Nuclear Power Plants according to Aging Period

경년열화 기간에 따른 원자력발전소용 비안전등급 케이블의 연소특성 분석

  • Kim, Min Ho (Department of Safety Engineering, Incheon National University) ;
  • Lee, Seok Hui (Department of Safety Engineering, Incheon National University) ;
  • Lee, Min Chul (Department of Safety Engineering & Fire Disaster Prevention Research Center, Incheon National University) ;
  • Lee, Sang Kyu (Department of Reactor System, Korea Institute of Nuclear Safety) ;
  • Lee, Ju Eun (Department of Reactor System, Korea Institute of Nuclear Safety)
  • 김민호 (인천대학교 안전공학과) ;
  • 이석희 (인천대학교 안전공학과) ;
  • 이민철 (인천대학교 안전공학과) ;
  • 이상규 (한국원자력안전기술원 계통평가실) ;
  • 이주은 (한국원자력안전기술원 계통평가실)
  • Received : 2020.04.21
  • Accepted : 2020.09.22
  • Published : 2020.10.31
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Abstract

In this study, combustion and smoke release characteristics of a non-class 1E cable for nuclear power plants were investigated according to aging period. The aging was reproduced through an accelerated aging method for interval of 10 years :10, 20, 30 and 40 year, which was applied the Arrhenius equation. The cable was subjected to accelerated aging. In order to understand combustion and smoke release characteristics, the cone calorimeter test was performed according to the standard code of KS F ISO 5660-1. Heat release rate, mass loss rate, average rate of heat emission and smoke production rate were examined through cone calorimeter test. Fire performance index, fire growth index and smoke factor were derived from test results for the comparison of quantitative fire risk. When comparing the fire performance index and the fire growth index, the early fire risk tends to decrease as aging progresses, which might be attributed from the fact that the volatile substances of cables were evaporated. However, when comparing the heat release rate, average rate of heat emission and mass loss rate, which represent the mid and late periods of the fire risk, the values of accelerated aging cables were much higher than those of non-aged cable, which signifies the unstable formation of the char layer resulted in the change in the performance of flame retardants. In addition, the results from the smoke characteristics show that the accelerated aging cables were lager than the non-aged cables in terms of overall fire risk. These results can be used as baseline data when assessing fire risk of cables and establishing fire safety code for nuclear power plants.

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References

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