Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Experimental Study of SBLOCA Simulation of Safety-Injection Line Break with Single Train Passive Safety System of SMART-ITL

SMART-ITL 1 계열 피동안전계통을 이용한 안전주입배관 파단 소형냉각재상실사고 모의에 대한 실험적 연구

  • Ryu, Sung Uk (Thermal Hydraulic Research Division, Korea Atomic Energy Research Institute) ;
  • Bae, Hwang (SMART Development Division, Korea Atomic Energy Research Institute) ;
  • Ryu, Hyo Bong (Thermal Hydraulic Research Division, Korea Atomic Energy Research Institute) ;
  • Byun, Sun Joon (Thermal Hydraulic Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Woo Shik (SMART Development Division, Korea Atomic Energy Research Institute) ;
  • Shin, Yong-Cheol (Thermal Hydraulic Research Division, Korea Atomic Energy Research Institute) ;
  • Yi, Sung-Jae (Thermal Hydraulic Research Division, Korea Atomic Energy Research Institute) ;
  • Park, Hyun-Sik (Thermal Hydraulic Research Division, Korea Atomic Energy Research Institute)
  • 류성욱 (한국원자력연구원 열수력안전연구부) ;
  • 배황 (한국원자력연구원 SMART 개발부) ;
  • 유효봉 (한국원자력연구원 열수력안전연구부) ;
  • 변선준 (한국원자력연구원 열수력안전연구부) ;
  • 김우식 (한국원자력연구원 SMART 개발부) ;
  • 신용철 (한국원자력연구원 열수력안전연구부) ;
  • 이성재 (한국원자력연구원 열수력안전연구부) ;
  • 박현식 (한국원자력연구원 열수력안전연구부)
  • Received : 2015.04.22
  • Accepted : 2016.01.20
  • Published : 2016.03.01
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Abstract

An experimental study of the thermal-hydraulic characteristics of passive safety systems (PSSs) was conducted using a system-integrated modular advanced reactor-integral test loop (SMART-ITL). The present passive safety injection system for the SMART-ITL consists of one train with the core makeup tank (CMT), the safety injection tank, and the automatic depressurization system. The objective of this study is to investigate the injection effect of the PSS on the small-break loss-of-coolant accident (SBLOCA) scenario for a 0.4 inch line break in the safety-injection system (SIS). The steady-state condition was maintained for 746 seconds before the break. When the major parameters of the target value and test results were compared, most of the thermal-hydraulic parameters agreed closely with each other. The water level of the reactor pressure vessel (RPV) was maintained higher than that of the fuel assembly plate during the transient, for the present CMT and safety injection tank (SIT) flow rate conditions. It can be seen that the capability of an emergency core cooling system is sufficient during the transient with SMART passive SISs.

노심보충탱크(Core Makeup Tank, CMT), 안전주입탱크(SafetyInjection Tank, SIT)와 자동감압계통(Auto Depressurization System, ADS)로 구성된 1 계열의 SMART 피동안전주입계통의 주입특성을 파악하기 위한 소형냉각재상실사고(SBLOCA) 모의에 대한 실험적 연구가 수행되었다. SBLOCA의시험은 0.4 인치 안전주입수 배관파단에 대해 수행되었으며, 정상상태 조건은 실험요건서에 제시된 시험 초기 조건을 만족시키도록 746초 동안 운전되었다. 노심 출력 및 안전주입 유량 등의 경계 조건도 적절히 모의되었으며, 안전주입계통 배관에서의 파단, 히터 트립 및 잔열곡선 인가, 원자로냉각재펌프 관성서행(Coastdown), 급수 중단, CMT 및 SIT의 주입, ADS #1 개방이 SBLOCA 시나리오에 따라 적절히 모의되었다. 노심지지원통 내부의 액체환산수위는 파단 초반에 감소하다가 CMT와 SIT가 주입되면서 서서히 회복되었으며, 피동안전주입계통의 주입유량이 노심 수위를 회복하기에 충분한 것으로 판단할 수 있다.

Keywords

References

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