Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Numerical Study of the Heat Removal Performance for a Passive Containment Cooling System using MARS-KS with a New Empirical Correlation of Steam Condensation

새로운 응축열전달계수 상관식이 적용된 MARS-KS를 활용한 원자로건물 피동냉각계통 열제거 성능의 수치적 연구

  • Jang, Yeong-Jun (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Lee, Yeon-Gun (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Kim, Sin (School of Energy System Engineering, Chung-Ang University) ;
  • Lim, Sang-Gyu (Central Research Institute, Korea Hydro and Nuclear Power Co.)
  • 장영준 (제주대학교 에너지공학과) ;
  • 이연건 (제주대학교 에너지공학과) ;
  • 김신 (중앙대학교 에너지시스템공학부) ;
  • 임상규 (한국수력원자력 중앙연구원)
  • Received : 2018.10.11
  • Accepted : 2018.11.20
  • Published : 2018.12.31
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Abstract

The passive containment cooling system (PCCS) has been designed to remove the released decay heat during the accident by means of the condensation heat transfer phenomenon to guarantee the safety of the nuclear power plant. The heat removal performance of the PCCS is mainly governed by the condensation heat transfer of the steam-air mixture. In this study, the heat removal performance of the PCCS was evaluated by using the MARS-KS code with a new empirical correlation for steam condensation in the presence of a noncondensable gas. A new empirical correlation implemented into the MARS-KS code was developed as a function of parameters that affect the condensation heat transfer coefficient, such as the pressure, the wall subcooling, the noncondensable gas mass fraction and the aspect ratio of the condenser tube. The empirical correlation was applied to the MARS-KS code to replace the default Colburn-Hougen model. The various thermal-hydraulic parameters during the operation of the PCCS follonwing a large-break loss-of-coolant-accident were analyzed. The transient pressure behavior inside the containment from the MARS-KS with the empirical correlation was compared with calculated with the Colburn-Hougen model.

피동원자로건물냉각계통(PCCS)은 사고 발생 시 원자로건물로 방출된 열을 제거하여 원전의 건전성을 보장하기 위해 설계되었다. PCCS의 열제거 성능은 증기-공기 혼합물의 응축열전달에 의해 결정된다. 본 연구에서는 응축열전달계수의 예측 정확도를 향상시키기 위해 새로운 상관식을 이식한 MARS-KS 코드를 사용하여 PCCS의 열제거 성능을 평가하였다. MARS-KS 코드에 사용된 새로운 상관식은 압력, 벽면과냉도, 비응축성 기체 질량분율 및 응축튜브의 종횡비와 같은 열전달계수에 영향을 미치는 변수들을 이용하여 개발하였고, 이는 MARS-KS코드의 기본 응축 모델인 Colburn-Hougen 모델을 대체하여 적용되었다. 대형파단 냉각재상실사고 발생 시 PCCS의 운전에 따른 다양한 열수력학적 변수들을 분석하였고, 열제거 성능 평가를 위해 새로운 상관식이 적용된 MARS-KS 코드의 원자로건물 압력거동 계산결과와 기존의 응축모델을 이용한 해석결과를 비교하였다.

Keywords

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Fig. 2. JNU condensation experimental facility

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Fig. 4 Steam mass flow at multi-junction 427.

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Fig. 5 Air mass fraction at SV400, SV310, and SV320.

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Fig. 6 PCCT temperature and PCCHX temperature.

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Fig. 7 PCCT level during LBLOCA.

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Fig. 8 LBLOCA ME data and heat removal rate by PHS and PCCS.

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Fig. 9 Containment pressure during the LBLOCA.

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Figs. 1. General concept of the PCCS with internal condensers. (a) Bundles of vertical condenser tubes; (b) Four trains of tube bundles connected to the passive containment cooling tank; (c) PCCS installed in the containment building

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Figs. 3. Nodalization scheme for containment with PCCS

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