Fire Science and Engineering (한국화재소방학회논문지)

Korean Institute of Fire Science and Engineering (한국화재소방학회)
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Experimental Study on the Toxicity Characteristics of Non-Class 1E Cables according to Accelerated Deterioration

가속열화에 따른 비안전등급 케이블의 독성특성에 관한 실험적 연구

  • Jang, Eun-Hui (Dept. of Safety Engineering, Incheon National Univ.) ;
  • Kim, Min-Ho (Dept. of Safety Engineering, Incheon National Univ.) ;
  • Lee, Min Chul (Dept. of Safety Engineering/Fire Disaster Prevention Research Center, Incheon National Univ.) ;
  • Lee, Sang-Kyu (Dept. of Reactor System Performance, Korea Institute of Nuclear Safety) ;
  • Moon, Young-Seob (Dept. of Reactor System Performance, Korea Institute of Nuclear Safety)
  • 장은희 (인천대학교 안전공학과) ;
  • 김민호 (인천대학교 안전공학과) ;
  • 이민철 (인천대학교 안전공학과/소방방재연구센터) ;
  • 이상규 (한국원자력안전기술연구원) ;
  • 문영섭 (한국원자력안전기술연구원)
  • Received : 2019.11.08
  • Accepted : 2019.11.27
  • Published : 2019.12.31
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Abstract

This study investigates the toxicity characteristics of two Non-Class 1E Cables (For security reasons, we refer to company A and company B) used in nuclear power plants according to the accelerated deterioration period. In accordance with NES 713 test equipment and standards, tests were carried out on non-aged cables and the cables subjected to 20- and 40-year-accelerated-deterioration; each of the cables was further classified into sheath and insulation. The test results showed that the toxicity indices of 20- and 40-year-accelerated-aged cables were higher than those for the non-aged cables, and 20-year-aged cables of both A and B companies showed the highest toxicity indices. This is attributed to the extensive emissions of carbon monoxide and halide gases such as hydrogen chloride and hydrogen bromide. Furthermore, to analyze the toxicity indices of sheath and insulation in detail, the US Department of Defense standard (MIL-DTL) was applied to determine whether the Toxicity index (T.I.) allowance was exceeded, and the results showed that the insulating materials emitted considerably more than the allowable limit.

본 연구에서는 원자력발전소용 비안전등급케이블 2종(보안상 A사, B사로 지칭키로 함)을 대상으로 가속열화 기간에 따른 독성 특성을 분석하였다. NES 713 시험장비 및 규격에 의거하여 비노화, 20년, 40년으로 가속열화한 케이블에 대해 피복재 및 절연재로 구분하여 시험하였다. 시험결과 20년, 40년 가속열화 케이블의 독성지수가 비노화 케이블의 독성지수보다 높았으며 A, B사 케이블 공통적으로 20년 가속열화 케이블에서의 독성지수가 높게 산출되었다. 이는 급증한 일산화탄소의 방출량과 더불어 염화수소와 브롬화수소의 할로겐계 가스 방출량이 높은 것이 주된 원인으로 파악되었다. 또한, 피복재와 절연재를 구분하여 분석 시 A, B사 케이블 일부 피복재의 독성지수가 높게 나타났다. 또한, 피복재와 절연재의 독성지수를 구체적으로 분석하고자 미국 국방성 규격인 MIL-DTL을 적용하여 독성지수 허용치 초과 여부를 판단하였으며, 이 중 절연재의 경우 상당량 초과하여 방출되는 결과를 보였다.

Keywords

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