• Title/Summary/Keyword: gas accident

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Development of mechanistic cladding rupture model for severe accident analysis and application in PHEBUS FPT3 experiment

  • Gao, Pengcheng;Zhang, Bin;Li, Jishen;Shan, Jianqiang
    • Nuclear Engineering and Technology
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    • v.54 no.1
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    • pp.138-151
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    • 2022
  • Cladding ballooning and rupture are the important phenomena at the early stage of a severe accident. Most severe accident analysis codes determine the cladding rupture based on simple parameter models. In this paper, a FRTMB module was developed using the thermal-mechanical model to analyze the fuel mechanical behavior. The purpose is to judge the cladding rupture with the severe accident analysis code. The FRTMB module was integrated into the self-developed severe accident analysis code ISAA to simulate the PHEBUS FPT3 experiment. The predicted rupture time and temperature of the cladding were basically consistent with the measured values, which verified the correctness and effectiveness of the FRTMB module. The results showed that the rising of gas pressure in the fuel rod and high temperature led to cladding ballooning. Consequently, the cladding hoop strain exceeded the strain limit, and the cladding burst. The developed FRTMB module can be applied not only to rod-type fuel, but also to plate-type fuel and other types of reactor fuel rods. Moreover, the FRTMB module can improve the channel blockage model of ISAA code and make contributions to analyzing the effect of clad ballooning on transient and subsequent parts of core degradation.

A Study on the Estimation of Human Damage Caused by the LP Gas Flame in Enclosure using Probit Model

  • Leem, Sa-Hwan;Huh, Yong-Jeong
    • Journal of the Korean Institute of Gas
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    • v.13 no.3
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    • pp.43-48
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    • 2009
  • The energetic and environmental problems have been getting serious after the revolution of modern industry. Therefore, demand of gas as an eco-friendly energy source is increasing. With the demand of gas, the use of gas is also increased, so injury and loss of life by the fire have been increasing every year. Hence the influence on flame caused by Vapor Cloud Explosion in enclosure of experimental booth was calculated by using the API regulations. And the accident damage was estimated by applying the influence on the adjacent structures and people into the PROBIT model. According to the probit analysis, the spot which is 5meter away from the flame has nearly 100% of the damage probability by the first-degree burn, 27.8% of the damage probability by the second-degree burn and 14.5% of the death probability by the fire.

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Development of Two-Dimensional Hydrogen Mixing Model in Containment Subcompartment Under the Severe Accident Conditions

  • Lee, Byung-Chul;Cho, Jae-Seon;Park, Goon-Cherl;Chung, Chang-Hyun
    • Proceedings of the Korean Nuclear Society Conference
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    • 1996.05b
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    • pp.663-668
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    • 1996
  • A two-dimensional continuum model for the prediction of the hydrogen mixing phenomena in the containment compartment under the severe accident conditions is developed. The model could predict well the distribution of time-dependent hydrogen concentration for selected HEDL Experiment. For a simulation of these experiments, the hydrogen is mixed uniform over the test compartment. To predict the extent of non-uniform distribution, the dominant factors such as the geometrical shape of obstacle and velocity of source injection in mixing phenomena are investigated. If the obstacle disturbing the flow of gas mixture exists in the compartment, the uniform distribution of hydrogen may be not guaranteed. The convective circulation of gas flow is separately formed up and down of the obstacle position, which makes a difference of hydrogen concentration between the upper and lower region of the compartment. The recirculation flow must have a considerable mass flow rate relative to velocity of the source injection to sustain the well-mixed conditions of hydrogen.

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Analysis of Recent Accidents and Regulating Activities for the Hazardous Materials in Korea

  • Kwon, Kyung-Ok;Kim, Young-Eun
    • Journal of the Korean Institute of Gas
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    • v.15 no.1
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    • pp.68-73
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    • 2011
  • The systems in Korea regarding manufacture, storage, transport and use of hazardous materials are regulated by the related laws and ordinances. The number of accident from hazardous materials has recently decreased but the size of accident has increased according to the hazardous substances are greatly consumed and delivered. The results of analysis showed that most of accidents are caused by human problems and occurred frequently at unauthorized facilities. It is suggested that workers should be trained more and the strict regulation on unauthorized facilities is needed to reduce the accidents caused by hazardous materials.

A Study on Repair Case of Journal and Bearing Damage for 25MW Industrial Gas Turbine (25MW급 산업용 가스터빈의 저널과 베어링 손상 보수사례에 관한 연구)

  • Kim, Byung Ok;Sun, Kyung Ho;Lee, An Sung
    • The KSFM Journal of Fluid Machinery
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    • v.15 no.6
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    • pp.64-69
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    • 2012
  • This paper deals with the study on repair case of journal shaft and bearing damage in 25MW industrial gas turbine caused by sudden blackout, operation mistake, and logic abnormal, etc. When a serious accident such as journal and bearing damage in a gas turbine occurs, the domestic local companies having the gas turbine are dependent on manufacturer for all maintenance and repair schedule until now. This case study shows that the damaged gas turbine is normally re-operated itself in domestic by establishing repair schedule in a short period of time, repairing damage journal shaft and tilting pad bearings, and performing rotating test for a reliability check. This paper can be regarded as the important case study of emergency test run experience of the refurbished 25MW gas turbine rotor.

Prototype Development of Design for Toxic Gas Detecting Electrochemical Sensor (유독가스 감지용 전기화학식 센서 디자인 및 시제품 개발)

  • Kim, Jin-Mo;Kim, Tae-Kyu
    • Journal of The Korean Digital Architecture Interior Association
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    • v.3 no.1
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    • pp.59-62
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    • 2003
  • The death from suffocation due to the gas from various disaster is frequent very and it occurs. Specially only from the company which treats the gas and only the enterprise which maintains the gas the many greeting accident occurs. Also accidents could occur when working around the toxic gas without one's noticing Therefore a development of the portable gas ditectoror is very essential. Specially with development of design and the new product of the electric chemical sensor might help reducing the many accidents. From the side which protects a worker's life, it isn't just simple equipment but also it must be connected directly to life saving is very important. Therefore, the key technical contents of development must be focused on sensor which is simple and easy to carry and able to detect varieties of toxic gas. So, this study is about the product design which is simple and easy to carry and to use.

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A Study on the Estimation of Damage by Leaking of NH3 and Cl2 applied to LPCVD (LPCVD에서 암모니아와 염소의 누출에 대한 피해예측)

  • Huh, Yong-Jeong;Leem, Sa-Hwan
    • Journal of the Korean Institute of Gas
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    • v.18 no.5
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    • pp.1-5
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    • 2014
  • As high-tech science has developed, the need of semiconductor is required constantly. However, there are many processes which use a great deal of poisonous gas in the semiconductor process, so the dangerousness by a gas leak is latent in these processes. Especially, the accident of toxic gas is almost made by ammonia and chlorine. Therefore this report estimates the damage by the leak of ammonia and chlorine used in LPCVD system.

Development of Virtual Reality Program for Safety Improvement of Hydrogen Fueling Station (수소충전소의 안전성 향상을 위한 버츄얼리얼리티 프로그램 개발)

  • Kim, Eun-Jung;Kim, Young-Gyu;Moon, Il
    • Journal of the Korean Institute of Gas
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    • v.12 no.4
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    • pp.29-33
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    • 2008
  • The focus of this study is to develop a virtual reality program for safe training and virtual reality of hydrogen station. This programme consists of 4 modules such as hydrogen and safety module, hydrogen station module, hypothetical experience module, and accident scenarios module for hydrogen experts. User can experience with principles and operation condition and collect the information of hydrogen station by this programme and can simultaneously study the probable scenarios, emergency response plan/standard operating procedure about hydrogen stations. It makes it possible to educate and safety publicity for the trainee. This virtual reality program will be expected to be helpful for hydrogen station's construction propagation and technology development which is essential for hydrogen energy induction.

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