• Journal of the KSME
• /
• v.33 no.8
• /
• pp.717-727
• /
• 1993

주요국의 보일러 및 압력용기의 기술기준 개발방향이 금속재료기술의 발달, 비파괴검사 기술의 개발, 용접기술의 급진전, 품질요건의 국제적인 규정의 제정 및 준수 등의 현상으로 볼 때 이를 대체적으로 수용하는 ASME Sec. III의 방향으로 통합되어 가는 느낌을 받고 있다. 따라서 우 리나라도 전담기구의 설립 또는 지정을 서둘러 장기적인 안목에서 체계적으로 대처하여야 급격히 변화하는 세계적인 기술흐름에 맞추어 우리의 관련산업이 지속적으로 발전 될 수 있으며 이와 관련된 기술개발방향이 바르게 갈 수 있을 것이다.

• Proceedings of the KIPE Conference
• /
• 2002.11a
• /
• pp.98-102
• /
• 2002

플랜트, 가스용기 등의 압력용기 제작 및 스텐레스, 알미늄 등의 특수금속용접에서 TIG 용접은 매우 중요한 기술적 위치를 차지하고 있다. 이런 용접에서 현재까지는 국내에서 노동 집약적인 수동 TIG 용접이 적용되고 있으나 인건비의 상승, 3D 산업으로 인한 숙련자의 부족으로 자동화가 급속히 추진되고 있다. 따라서 본 연구에서는 10A 이하에서도 용접이 가능한 극 정밀 직류 TIG 펄스 용접기에 관한 연구결과를 다룬다.

• The monthly packaging world
• /
• s.348
• /
• pp.109-114
• /
• 2022

환경부는 재활용의무생산자가 준수하여야 할 포장재 재질·구조 및 재활용의 용이성에 대한 평가 기준을 마련하는 것을 목적으로 '포장재 재활용 용이성 등급평가 기준'을 2월 28일부로 일부 개정했다고 발표했다. 이로 인해 플라스틱과 금속 등이 함께 부착된 화장품 용기, 포장용기와 쟁반(트레이) 등은 재활용이 어려운 등급으로 상향 조정된다. 또한 서로 다른 재질이 혼합돼 분리할 수 없으면 일반 쓰레기로 버려야 한다. 이번호와 다음호에 걸쳐 그 상세 내용을 살펴보도록 한다.

• Composites Research
• /
• v.17 no.5
• /
• pp.1-6
• /
• 2004

Composite pressure vessels with HDPE (high density polyethlyne) liner with metal boss at each end were developed by Filament Winding Process. The vessel is composed of a dome-shaped part at each end and a cylinder-shaped part at the middle of the vessel. The environmental tests carried out for possible vessel materials such as High Density Polyethlyn (HDPE), resins and reinforcing fibers up to a year showed no significant damages. The boss was designed to minimize the gas leak which was verified by FEM analysis. Most ideal fiber tension was obtained by experimental method and the fiber volume fraction, $\textrm{V}_{f}$, obtained by image analyzer were 55.4 % in cylinder and 55.6 % in dome parts, respectively. Winding pattern is programmed to control the composite thickness in the dome areas such that the failure of the vessel may occur in the cylinder. During the cure, the vessel was rotated and a constant internal pressure of 0.62 bar was applied. From this, the vessel's burst pressure is improved by 28 %. The burst and fatigue tests for under-wound and fully wound vessel showed satisfactory results.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
• /
• v.14 no.2
• /
• pp.157-168
• /
• 2016

Radioactive waste container designs should comply with the requirements for safety (i.e., transportation, storage, disposal) and other criteria such as economics and technology. These criteria are also applicable to the future management of the large amount of LLW and VLLW to arise from decontamination and decommissioning (D&D) of nuclear power plants, which have different features compared to that of wastes from operation and maintenance (O&M). This paper proposes to develop a set of standard containers of multi-purpose usage for transportation, storage and disposal. The concepts of the containers were optimized for management of D&D wastes in consideration of national system for radioactive waste management, in particular the Gyeongju Repository and associated infrastructures. A set of prototype containers were designed and built : a soft bag for VLLW, two metallic containers for VLLW/LLW (a standard IP2 container for sea transport and ISO container for road transport). Safety analyses by simulation and tests of these designs show they are in compliance with the regulatory requirements. A further development of a container with concrete is foreseen for 2016.

• Journal of Food Hygiene and Safety
• /
• v.36 no.3
• /
• pp.264-270
• /
• 2021

In this study we investigated the elution level of lead (Pb), cadmium (Cd), arsenic (As), zinc (Zn), nickel (Ni), antimony (Sb), germanium (Ge), aluminum (Al) and hexavalent chromium (Cr⁶⁺) from 69 home-cooking utensils into a food stimulants. The results of migration testing according to the Korea standards and specifications for utensils, containers and packages showed values the allowable migrantion limits. Al was detected in all 7 utensil materials with the average concentration ranging from 0.002-5.989 mg/L. According to the migration conditions for (180℃, 30 min), the average concentration of Al in paper was 7.2 times higher than 25℃, 10 min (P<0.05). The results of migration testing at 180℃, 30 min were also below the allowable migrantion limits. When comparing with the provisional tolerable weekly intake (PTWI) of Al, the estimated weekly intakes (EWI) accounted for 0.000-0.045% for Al.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2006.05a
• /
• pp.61-65
• /
• 2006

A thery was developed to design a high pressure vessel with combined structure of the metal and the composite to withstand the pressure of several tens of thousands psias to reduce the weight of the impulse motor which produces high level of thrust within several tens of seconds. The elastic-plastic stress analyses were carried out to prove the validity of the design theory A combustion chamber of the impulse motor was designed by the design theory, fabricated, and tested by the hydraulic pressure and the static firings. The bursting pressures from the tests were compared to those predicted by tile design theory and the stress analyses and found to be almost the same. It will be possible to design the high pressure vessel with combined structure of the metal and the composite very easily by the proposed design theory.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.10 no.2
• /
• pp.23-30
• /
• 2006

A thery was developed to design a high pressure vessel with combined structure of the metal and the composite to withstand the pressure of several tens of thousands psias to reduce the weight of the impulse motor which produces high level of thrust within several tens of seconds. The elastic-plastic stress analyses were carried out to prove the validity of the design theory. A combustion chamber of the impulse motor was designed by the design theory, fabricated, and tested by the hydraulic pressure and the static firings. The bursting pressures from the tests were compared to those predicted by the design theory and the stress analyses and found to be almost the same. It will be possible to design the high pressure vessel with combined structure of the metal and the composite very easily by the proposed design theory.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
• /
• v.10 no.3
• /
• pp.209-218
• /
• 2012

A pyroprocess is currently being developed by KAERI to cope with a highly accumulated spent nuclear fuel in Korea. The pyroprocess produces a certain amount of high-level radioactive waste (HLW), which is solidified by a ceramic binder. The produced ceramic waste will be confined in a secure disposal canister and then placed in a deep geologic formation so as not to contaminate human environment. In this paper, the development of a disposal canister was overviewed by discussing mainly its design premises, constitution, manufacturing methods, corrosion resistance in a deep geologic environment, radiation shielding, and structural stability. The disposal canister should be safe from thermal, chemical, mechanical, and biological invasions for a very long time so as not to release any kind of radionuclides.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1998.05a
• /
• pp.64-69
• /
• 1998

KALMER 우라늄 금속핵연료노심의 평형주기에 대하여 주기길이, 농측도, 중식비의 관점에서 설계인자 변경에 따른 변화를 분석하였다. 유효노심높이, 반경방향 블랑캣의 batch수, 개스팽창모듈(GEM)의 적용성, 노용기내핵 연료저장(IVS)의 사용. 핵연료핀의 직경 증가 둥에 대한 설계 변경이 고려되었다. 본 연구결과를 통하여, 평탄화된 출력분포 및 핵연료의 이용도 향상을 기하면서 설계변경이 타 분야에 미치는 영향을 최소화하고 본래 KALMER의 안전성을 유지하고자 핵연료핀의 직경을 증가시킨 fat pellet 설계방안을 채택하였다