• Title, Summary, Keyword: material consequence

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Model-theoretic Consequence and Modality (모형론적 귀결과 양상성)

  • Choi, Wonbae
    • Journal for History of Mathematics
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    • v.25 no.4
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    • pp.21-36
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    • 2012
  • It is commonly believed that the model-theoretic account of logical consequence is originated from Tarski' s 1936 paper. But Etchemendy has denied this. This paper discusses and evaluates the recent controversies over whether the definition of logical consequence presented in Tarski' s paper is based on the fixed-domain conception or the variable-domain conception.

Consequence Analysis of flammable Materials at Risk Based Inspection using API-581 (API-581에 의한 위험기반 검사에서 가연성 물질의 사고결과 분석)

  • Lee Hern-Chang;Ryoo Jun;Kim Hwan-Joo;Jang Seo-Il;Kim Tae-Ok
    • Journal of the Korean Society of Safety
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    • v.19 no.4
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    • pp.60-68
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    • 2004
  • Consequence analysis of flammable materials that affect to a risk of facilities was studied at the risk based inspection using API-581. We found that consequence areas (damage area of equipment and fatality area) by release accident of flammable materials showed high value for the case of liquid phase and auto-ignition likely, and that consequence areas of flammable gases decreased as temperature increased and the pipe diameter and pressure decreased at continuous release.

Offsite Consequence Analysis and safety management system process integration plan of safety management system (장외영향평가 및 공정안전관리제도의 통합 안전환경관리방안에 관한 연구)

  • Kim, Dong-Jun;Lee, In-Bok;Moon, Jin-Young;Chun, Young-Woo
    • Journal of the Korea Safety Management & Science
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    • v.18 no.3
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    • pp.63-70
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    • 2016
  • The main point of this study is to find out duplicates and differences among various regulations from different organizations. Also, it focuses on creating a reasonably unified regulation system to standardize safety & environment management. In this study, I analyzed the commonalities and the differences of two systems which are typical korean Process Safety Management System and off-site Consequence Analysis. It is confirmed that there are 25 species of overlapped material of those two systems and assessment like handling material information, facilities lists, hazardous substances and list of machine power. Process safety report focuses on onsite workers and facility protect. On the other hand, off-site Consequence Analysis focuses on design, arrangement and management of handling facility from off-site influence. I found difference two system of Enforcement purposes and way. Contradiction of Harmful information of Chemicals Control Act and occupation safety and health acts from same material. To be specific, There are no unit rule of occupation safety and health acts. so it permit inch, psi etc. But Chemicals Control Act provides that m, Mpa units. Therefore, Each regulatory duplication of items for chemicals management, standardization is writing so that you can coordinate overlapping items in the measures the need to be presented.

Selection of Release Scenario and Consequence Analysis for Gas Explosion by Pipe Release (배관누출에 의한 가스 폭발사고에서 누출 시나리오 선정 및 사고결과 분석)

  • Kim, Tae-Ok;Lee, Hern-Chang;Ryoo, Jun
    • Journal of the Korean Institute of Gas
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    • v.10 no.4
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    • pp.52-62
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    • 2006
  • In this study, we tried to propose a selection method of release scenarios and a method of consequence analysis at a gas explosion by pipe release. Thus, release rates, damage areas of the facilities, and fatality areas were estimated and analyzed at various release conditions(temperature, pressure, release material, etc). As a results, we could conclude that the rupture was the worst case of release scenarios, and at release rates and damage areas were better estimated by the weighted average method considering a generic failure frequency of the release hole than by an arbitrary selection of the release hole.

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A Study of Emergency Response for the Leakage Accident of Hazardous and Noxious Substances in a Port (항만에서의 위험·유해물질(HNS) 누출사고 대응에 관한 연구)

  • Woo, Young Jin;Lee, Chang Jun
    • Journal of the Korean Society of Safety
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    • v.31 no.6
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    • pp.32-38
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    • 2016
  • In general, lots of containers including various dangerous materials are transported to the port located in big cities such as Busan where massive residents live. Thus, it's really important how to make the emergency response for the leak accidents of dangerous materials and evaluate the direct or indirect damages to adjacent areas. In this study, in order to make reasonable emergency plans, CA (Consequence Analysis) is employed after selecting a key hazardous and noxious material, hydrogen fluroide. This material accounts for the third largest portion of cargo volume among all dangerous materials and can cause a huge damage in case of leakages. As a case study, Busan North port is selected as a test port since the portion of dangerous materials is higher than that of other ports in Busan. It is assumed that 1 ton of hydrogen fluoride is spilled at Busan North port. CA is performed to assess the impact of this accident. Throughout CA, the ERPG-2 range of a leak accident can be evaluated and this result can be used for decision making tools for mitigating the impact of a leak accident. To mitigate the damage of this accident, suitable a protective equipment and resident evacuation procedures should be prepared. Finally, this study can provide a systematic approach to make the emergency plan for reducing economical and personal losses.

A Development of Consequence Analysis System for Combustible Materials Release Events Based on HTML5 Web (HTML5 웹 기반 가연성 물질 누출 피해영향평가 시스템 개발)

  • Lee, Ugwiyeon;Ji, Hyunmin;Oh, Jeongseok;Cho, Wansu
    • Journal of the Korean Institute of Gas
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    • v.23 no.6
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    • pp.39-60
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    • 2019
  • Korea Gas Safety Corporation is developing consequence analysis system for combustible materials release events to enhance risk assessment technology and its efficiency. Unlike general consequence analysis programs, the final consequence area was implemented through ETA analysis based on API-581 standard, and a convenient user interface was constructed based on HTML5-based responsive web technology. In addition, a phase equilibrium module using third-order state equations (such as Peng-Robinson, SRK, and RK) and fugecity was implemented to analyze the mixture quality. Also. using the consequence analysis algorithm introduced in CCPS books and TNO Yellow Book, we developed material leak analysis module, fireball, pool fire, jet fire, flash fire, and vapor cloud explosion consequence assessment module. In addition, the conditions for calculating the safety distance were prepared with using the control values in the EIGA standard, PAC, and Bevi Reference Book.

Soil Adsorption and Desorption of SKYBIO

  • Chang, Hee-Ra;Kim, Kyun;Kim, Yong-Hwa
    • Proceedings of the Korea Society of Environmental Toocicology Conference
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    • pp.152-152
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    • 2003
  • The majority of the SKYBIO will be used in the treatment of water in food processing plants, swimming pools and cooling towers, in the manufacture fabric softeners in Australia. Most will eventually be released into domestic sewage system as a consequence of product use. The SKYBIO is not readily biodegradable (0% over 28 days), and is expected to have a low partition coefficient and high water solubility (285 g/L), all indicating that the material would be mobile in both aquatic and terrestrial compartment. The PEC/PNEC ratio for the aquatic environment is 56. This value is significantly greater than 1, indicating an immediate concern to the aquatic compartment. However as a consequence of it's cationic character, the SKYBIO will be expected to associate to negatively charged organic matter in soil and sediment.

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Research of Restoration Material in Pottery and Porcelain Conservation (도토기 보존처리에 사용된 복원재료 연구)

  • Yang Pil-Seung;Moon Sun-Young;Park Gi-Jung
    • 한국문화재보존과학회:학술대회논문집
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    • pp.179-184
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    • 2005
  • Materials used for repairing and restoring both pottery and porcelain are practically organic, which makes the analysis procedure difficult in the course of time. It is, however, important in the field of conservation to analyze the material applied in the past. In consequence, this research will examine the components of the restoration materials collected in the process of ceramic conservation: the fillings using SEM-EDS and FT-IR; retouching materials; the adhesive used between the filling and retouching material.

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Study on the Code System for the Off-Site Consequences Assessment of Severe Nuclear Accident (원전 중대사고 연계 소외결말해석 전산체계에 대한 고찰)

  • Kim, Sora;Min, Byung-Il;Park, Kihyun;Yang, Byung-Mo;Suh, Kyung-Suk
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.14 no.4
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    • pp.423-434
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    • 2016
  • The importance of severe nuclear accidents and probabilistic safety assessment (PSA) were brought to international attention with the occurrence of severe nuclear accidents caused by the extreme natural disaster at Fukushima Daiichi nuclear power plant in Japan. In Korea, studies on level 3 PSA had made little progress until recently. The code systems of level 3 PSA, MACCS2 (MELCORE Accident Consequence Code System 2, US), COSYMA (COde SYstem from MAria, EU) and OSCAAR (Off-Site Consequence Analysis code for Atmospheric Releases in reactor accidents, JAPAN), were reviewed in this study, and the disadvantages and limitations of MACCS2 were also analyzed. Experts from Korea and abroad pointed out that the limitations of MACCS2 include the following: MACCS2 cannot simulate multi-unit accidents/release from spent fuel pools, and its atmospheric dispersion is based on a simple Gaussian plume model. Some of these limitations have been improved in the updated versions of MACCS2. The absence of a marine and aquatic dispersion model and the limited simulating range of food-chain and economic models are also important aspects that need to be improved. This paper is expected to be utilized as basic research material for developing a Korean code system for assessing off-site consequences of severe nuclear accidents.

Consequence Analysis for Release Scenario of Buried High Pressure Natural Gas Pipeline (지하매설 도시가스배관의 누출시나리오에 따른 사고피해영향분석)

  • Kim, Jin Hyung;Ko, Byung Seok;Yang, Jae Mo;Ko, Sang-Wook;Ko, Jae Wook
    • Journal of the Korean Institute of Gas
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    • v.18 no.3
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    • pp.67-74
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    • 2014
  • Buried natural gas pipelines in densely populated urban areas have serious hazards of property damages and casualties generated by release, dispersion, fire and explosion of gas caused by outside or inside failures. So as to prevent any accident in advance, managers implement danger management based on quantitative risk analysis. In order to evaluate quantitative risk about buried natural gas pipelines, we need calculation for radiant heat and pressure wave caused by calculation for release rate of chemical material, dispersion analysis, fire or explosion modeling through consequence analysis in priority, in this paper, we carry out calculation for release rate of pressured natural gas, radiant heat of fireball based in accident scenario of actual "San Bruno" buried high pressured pipelines through models which CCPS, TNO provide and compare with an actual damage result.