• The Safety technology
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• no.195
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• pp.38-39
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• 2014

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.5 no.2
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• pp.155-169
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• 2007

A transport container for a 500 kCi tritium storage vessel was developed, which could be used for the transport of metal tritide from Wolsong TRF facility to a disposal site. The structural, thermal, shielding, and confinement analyses were performed for the container in a view of Type B. As a result of structural analysis, the developed container sustained its integrity under normal and accidental conditions. The maximum temperature increase of the inner storage vessel by radiation was evaluated at $134.8^{\circ}C at room temperature. In $800^{\circ}C$ fire test, The thermal barrier of container sustained the inner vessel at $405^{\circ}C after 30 min, which temperature was allowable for the container integrity since maximum design temperature of inner vessel was $550^{\circ}C. In the evaluation of the shielding, the activity of radiation was nearly zero on the outer surface of inner vessel. Consequently the transport container for a 500 kCi tritium was evaluated to pass all the safety tests including accidental condition, so it was concluded that the designed transport container is proper to be used.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.332-335
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• 2011

Electro-Mechanical Ignition Safety Device(EMISD) for solid rocket motor is designed and manufactured. The EMISD utilizes a true rotary solenoid for arming mechanism and an electric squib(initiator) for generating ignition energy. In order to prove the ignition capability of the EMISD, 10-cc Closed Bomb Test(CBT) is performed, which measures the pressure built by high temperature and high pressure gas generated by operating EMISD.

• Journal of the Korean Institute of Gas
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• v.15 no.1
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• pp.30-34
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• 2011

This paper presents a strength safety evaluation of composite pressure container for hydrogen fuel tanks with a storage capacity of 104 liter and 70MPa pressure. The carbon fiber composite container is manufactured by an aluminum liner of Al6061-T6 and composite multi-layers of hoop winding layer in circumferential direction, $12^{\circ}C$ inclined winding layer and $70^{\circ}C$winding layer in helical direction respectively. The FEM results on the strength safety of composite fuel tanks were evaluated with a criterion of design safety of US DOT-CFFC and KS B ISO 11119-2 codes. The FEM computed results indicate that the proposed design model of 104 liter composite container is safe based on two strength safety codes. But, the computed results of carbon fiber fuel tanks based on US DOT-CFFC code is safer compared with that of KS B ISO 11119-2. Thus the hydrogen gas pressure container of 70MPa may be evaluated and designed by US DOT-CFFC code for more strength safety.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.735-738
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• 2011

본 논문에서는 LS-DYNA를 이용하여 원자력 운반용기의 탄자충격에 대한 해석을 수행하였다. 문명의 발달과 더불어 원자력 발전소는 많이 생겼으며 미래에도 유망하다. 원자력 발전소에서 발생되는 사용 후 핵연료에는 환경이나 사람들에게 유해한 방사성 물질이 포함되어 있기 때문에 이를 운반하는 운반용기에 대한 구조적 안전성 확보가 필요하다. 운반용기의 이동과정에서 여러 가지 사고가 날 수 있으므로 이에 대한 대비가 필요하다. 해석에는 운반플라스크와 컨테이너가 사용되었다. 운반플라스크 안에 컨테이너가 들어가 있는 형상을 갖는데 이 부분에 탄자 충격을 가하고, 이 때 운반용기에서 받는 충격량과 변화에 대해 관찰하였다. 탄자도 실제 상황과 비슷하게 하기 위해 보편적으로 사용되는 k-2 소총에 들어가는 것으로 사용하였다. 이를 통하여 운반용기에 탄자충격이 가해졌을 때 구조적 안전성을 평가하였다.

• Journal of the Korean Institute of Gas
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• v.14 no.2
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• pp.1-6
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• 2010

The strength safety of high pressure gas cylinder has been analyzed by using a finite element method. In this study, the internal gas pressures of a steel bombe include a service charging pressure of $9kg/cm^2$, high limit charging pressure of $18.6kg/cm^2$, high limit of safety valve operation pressure $24.5kg/cm^2$, and hydraulic testing pressure of $34.5kg/cm^2$. The computed FEM results indicate that the strength safety for a service charging pressure of $9kg/cm^2$ and high limit charging pressure of $18.6kg/cm^2$ is safe because the stress of a gas cylinder is within yield strength of steel. But the stress for a hydraulic testing pressure of $34.5kg/cm^2$ sufficiently exceeds the yield strength and remains under the tensile strength. If the hydraulic testing pressures frequently apply to the gas cylinder, the bombe may be fractured because a fatigue residual stress is accumulated on the lower round end plate due to a plastic deformation. The computed results show that the concentrated force in which is applied on a skirt zone does not affect to the lower round end plate, and the most weak zone of a bombe is a middle part of a lower round end plate between a bombe body and a skirt for a gas pressure. Thus, the FEM results show that the profile of a lower round end plate is an important design parameter of a high pressure gas cylinder.

• The monthly packaging world
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• s.249
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• pp.119-129
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• 2014

식품의약품안전처는 기구 및 용기 포장의 효율적인 안전관리 체계 구축을 위하여 식품 기계 기구용 윤활제 및 재활용 식품 기구 및 용기 포장 관련 규정을 신설하고, 재질별 용출시험용액의 조제 등 시험법을 재정비하고자 기구 및 용기 포장의 기준 및 규격을 일부 개정고시했다. 본 고에서는 주요 내용 및 신구조문을 비교해 살펴보도록 한다.

• The monthly packaging world
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• s.246
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• pp.111-121
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• 2013

식품의약품안전처는 기구 및 용기 포장의 효율적인 안전관리 체계 구축을 위하여 식품 기계 기구용 윤활제 및 재활용 식품 기구 및 용기 포장 관련 규정을 신설하고, 재질별 용출시험용액의 조제 등 시험법을 재정비하고자 기구 및 용기 포장의 기준 및 규격 일부개정고시(안) 행정예고를 했다. 본 고에서는 주요 내용 및 신 구조문을 대비해 살펴보도록 한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.12
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• pp.1166-1173
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• 2011

Electro-Mechanical Ignition Safety Device(EMISD) for solid rocket motor is designed and manufactured. The EMISD utilizes a true rotary solenoid for arming mechanism and an electric squib(initiator) for generating ignition energy. In order to prove the ignition capability of the EMISD, 10-cc Closed Bomb Test(CBT) is performed, which measures the pressure built by high temperature and high pressure gas generated by operating EMISD. The pressure built in the free volume of 10-cc closed bomb and the opening time of the ignition gas outlet are calculated using one dimensional gas dynamic model which is composed of the ideal gas equation and mass-energy conservation equation. Comparing the test result with model prediction, it is realized that the pressure built in the free volume of closed bomb due to the firing of EMISD, has the efficiency ratio of about 34%.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.870-876
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• 1998

원자로용기의 안전성은 가동중 운전조건과 조사취화등으로 인한 재료의 열화(degradation)를 검토함으로써 평가되는데, 특히 운전조건중, 비상사태에 해당하는 가압열충격에 관한 평가가 최근 중요한 안전문제로 부각되고 있다 본 연구의 목적은 가압열충격 사고중 소규모 냉각재 손실사고(Small LOCA)가 발생하는 경우, 원자로용기 내벽에 존재하는 균열의 안전성을 유한요소해석을 통해 평가하는 것이다. 본 연구에서는 Small LOCA 발생시 원자로용기의 내벽에 존재하는 균열의 종류, 방향, 균열형상비 및 클래드부의 두께가 응력확대 계수 계산에 미치는 영향을 평가하였으며, 이를 위해 총 14가지 경우에 대해서 3차원 유한요소해석을 수행하였다. 이러한 Small LOCA 해석수행을 기초로 다양한 가압열충격 사고에 대한 유한요소해석 모델링 기법, 해석 기법, 후처리 기법을 제시하였다.