• Title/Summary/Keyword: 내환경기기검증

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A Study on Application Analysis Using RETRAN Computer Code for the Environmental Qualification Flood Analysis Following the Main Feed Water Line Break (주급수관 파단에 따른 내환경검증 침수분석용 전산코드 RETRAN의 적용 해석연구)

  • Park, Young-Chan;Cho, Cheon-Hwey;Hong, Sung-In
    • Journal of Energy Engineering
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    • v.16 no.3
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    • pp.103-112
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    • 2007
  • Flood issue for nuclear power plants designed and built in 1970 is extremely severe for main steam header compartment and main feedwater line region of intermediate building and lower floor. A calculation for flood level at the main feedwater line isolation compartment is now performing by hand calculation. But, this methodology is quite conservative assumption. The goal of this study was to develop method to analyze flowrate using the RETRAN-3D computer code, and the developed method was applied to flood level analysis following main feedwater line break. As a result of analysis, flood level was low remarkably.

Analysis of EQ pH Condition and Fission Product Removal Capability for Nuclear Power Plant (원전의 내환경기기검증 화학환경 및 핵분열생성물 제거능력 평가)

  • Song, Dong Soo;Ha, Sang Jun;Seong, Je Joong;Jeon, Hwang Yong;Huh, Seong Cheol
    • Journal of Energy Engineering
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    • v.23 no.3
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    • pp.186-190
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    • 2014
  • Nuclear Power Plants require the control ability of chemical condition (pH) because pH control during transient accident such as LOCA makes an able the fission product removal capability to be maintained, stress corrosion cracking of stainless steel equipment to be prevented and the production of hydrogen by aluminum and zinc to be minimized. An NPP is designed to control the pH of containment spray and sump coolant using the spray additives 30% NaOH in the event of loss of coolant accident. In this paper, the pH of sump coolant of an NPP during LOCA was analyzed and the fission products removal constant and decontamination factor were calculated according to Standard Review Plan 6.5.2 related to spray chemical conditions of pH. The calculated pH value of recirculation mode using the computer code corresponds to 8.09~9.67, which meets the chemical environment regulation requirements. The fission product removal capability caused by containment spray system is performed to provide input to radiation analysis.

Analysis of Loss of HVAC for Nuclear Power Plant (원전의 공기조화설비(HVAC) 상실사고 분석방법)

  • Song, Dong-Soo
    • Journal of Energy Engineering
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    • v.23 no.1
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    • pp.90-94
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    • 2014
  • Environmental qualification (EQ) for safety-related equipment is required to ensure that those equipment will perform their required function even under the harsh environment conditions arising from design basis accident in the nuclear power plant. As a part of EQ program, the room temperature analysis in case of a loss of Heating, Ventilation, and Air Conditioning(HVAC) system was carried out to ensure the operability of the safety-related equipment of a nuclear power plant randomly chosen among the Korean nuclear power plants. In this paper, this analysis was performed in the conservative perspective using GOTHIC code. The room temperature analysis includes selecting the rooms in which the safety related equipment are located but not supported by safety related HVAC and determining the temperature of the selected rooms. Target rooms for the analysis consist of W229/W237 (Aux. feedwater pump room), W232 (Aux. feedwater tank room) and W230 (Equipment passageway). The results showed the temperature range from $43^{\circ}C$ to $83^{\circ}C$, in 72 hours after a loss of HVAC. Those values are far below of generic EQ temperature($171^{\circ}C$). Therefore, it is satisfied with EQ requirement of temperature limits on safety related equipment.

Optimized Flooding Analysis Method for Compartment for Nuclear Power Plant (원전 격실에 대한 최적 침수분석 방법)

  • Song, Dong-Soo;Kim, Sang-Yeol
    • Journal of Energy Engineering
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    • v.21 no.1
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    • pp.75-80
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    • 2012
  • In this paper a realistic bounding method for flooding analysis following rupture of large size of thanks and piping is defined. Mass and energy release during main feedwater line break accident is analyzed with RETRAN code. It is modeled that the main feed water control valve is closed in 5.0 seconds after reactor trip. In result of the analysis, largest mass and energy is discharged at 70% reactor power. The flood sources for main feedwater room are calculated when piping failure occurs in the high energy line and medium energy line. Based on the result of flood level (1.43m), it is investigated that all of the safety-related environmental qualification equipments are well located above the flood level.