• Title, Summary, Keyword: MFCI

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Investigation of molten fuel coolant interaction phenomena using real time X-ray imaging of simulated woods metal-water system

  • Acharya, Avinash Kumar;Sharma, Anil Kumar;Avinash, Ch.S.S.S.;Das, Sanjay Kumar;Gnanadhas, Lydia;Nashine, B.K.;Selvaraj, P.
    • Nuclear Engineering and Technology
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    • v.49 no.7
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    • pp.1442-1450
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    • 2017
  • In liquid metal fast breeder reactors, postulated failures of the plant protection system may lead to serious unprotected accidental consequences. Unprotected transients are generically categorized as transient overpower accidents and transient under cooling accidents. In both cases, core meltdown may occur and this can lead to a molten fuel coolant interaction (MFCI). The understanding of MFCI phenomena is essential for study of debris coolability and characteristics during post-accident heat removal. Sodium is used as coolant in liquid metal fast breeder reactors. Viewing inside sodium at elevated temperature is impossible because of its opaqueness. In the present study, a methodology to depict MFCI phenomena using a flat panel detector based imaging system (i.e., real time radiography) is brought out using a woods metal-water experimental facility which simulates the $UO_2-Na$ interaction. The developed imaging system can capture attributes of the MFCI process like jet breakup length, jet front velocity, fragmented particle size, and a profile of the debris bed using digital image processing methods like image filtering, segmentation, and edge detection. This paper describes the MFCI process and developed imaging methodology to capture MFCI attributes which are directly related to the safe aspects of a sodium fast reactor.

A Study on the Algorithm Design of CES_RTU(Consumer Electrical Safety-Remote Terminal Unit) using Telemetrics Method (텔레메트릭스 기법을 적용한 옥내용 전기안전감시시스템(CES_RTU)의 알고리즘 설계에 관한 연구)

  • Kim, Young-Sik;Kwon, Wan-Sung;Han, Dong-Hwa;Choi, Jung-Muk;Yoo, Jae-Geun;Choe, Myeong-Il;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • pp.157-159
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    • 2008
  • 본 논문은 전력의 안정적 공급 및 신뢰도 확보를 위해 전력설비의 실시간 감시 및 예방진단 시스템을 위해 텔레메트릭스 기법을 이용한 원격 통신시스템에 대한 연구를 통한 옥내용 전기안전감시진단시스템 (CES_RTU : Consumer Electrical Safety-Remote Terminal Unit)에 대한 새로운 알고리즘을 설계에 관련된 연구를 하였다.

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TRIGGERING AND ENERGETICS OF A SINGLE DROP VAPOR EXPLOSION: THE ROLE OF ENTRAPPED NON-CONDENSABLE GASES

  • Hansson, Roberta Concilio
    • Nuclear Engineering and Technology
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    • v.41 no.9
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    • pp.1215-1222
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    • 2009
  • The present work pertains to a research program to study Molten Fuel-Coolant Interactions (MFCI), which may occur in a nuclear power plant during a hypothetical severe accident. Dynamics of the hot liquid (melt) droplet and the volatile liquid (coolant) were investigated in the MISTEE (Micro-Interactions in Steam Explosion Experiments) facility by performing well-controlled, externally triggered, single-droplet experiments, using a high-speed visualization system with synchronized digital cinematography and continuous X-ray radiography. The current study is concerned with the MISTEE-NCG test campaign, in which a considerable amount of non-condensable gases (NCG) are present in the film that enfolds the molten droplet. The SHARP images for the MISTEE-NCG tests were analyzed and special attention was given to the morphology (aspect ratio) and dynamics of the air/ vapor bubble, as well as the melt drop preconditioning. Energetics of the vapor explosion (conversion ratio) were also evaluated. The MISTEE-NCG tests showed two main aspects when compared to the MISTEE test series (without entrapped air). First, analysis showed that the melt preconditioning still strongly depends on the coolant subcooling. Second, in respect to the energetics, the tests consistently showed a reduced conversion ratio compared to that of the MISTEE test series.