• Title/Summary/Keyword: KRISS

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Current Status of Standardization for Quality Control of Hydrogen Fuel in Hydrogen Refueling Stations for Fuel Cell Electric Vehicles (수소충전소 내 연료전지용 수소연료 품질 관리 및 표준화 동향)

  • KIM, DONGKYUM;LIM, JEONG SIK;LEE, JEONGSOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.33 no.4
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    • pp.284-292
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    • 2022

  • Hydrogen is promising a candidate for energy supporting the carbon neutrality policy for greenhouse gas reduction, which is being promoted in several countries, including Korea. Although challenging efforts-such as lowering the costs of green hydrogen production and fuel cells-remain, hydrogen fuel cell electric vehicles (FCEVs) are expected to play a significant role in the energy transition from fossil fuels to renewable energy. In line with this objective, the hydrogen FCEV working group in the International Organization for Standardization (ISO) compiled and revised international standards related to hydrogen refueling stations as of 2019. A well-established hydrogen quality management system based on the standard documents will increase the reliability of hydrogen charging stations and accelerate the use of FCEVs. In this study, among the published ISO standards and other references, the main requirements for managing charging stations and developing related techniques were summarized and explained. To respond preemptively to the growing FCEV market, a continuous hydrogen quality monitoring method suitable for use at hydrogen charging stations was proposed.

  • https://doi.org/10.7316/KHNES.2022.33.4.284 인용 PDF KSCI

Thickness measurements of a Cr coating deposited on Zr-Nb alloy plates using an ECT pancake sensor

  • Jeong Won Park;Bonggyu Ji;Daegyun Ko;Hun Jang;Wonjae Choi
    • Nuclear Engineering and Technology
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    • v.55 no.9
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    • pp.3260-3267
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    • 2023

  • Zr-Nb alloy have been widely used as fuel rods in nuclear power plants. However, from the Fukushima nuclear accident, the weakness of the rod was revealed under harsh conditions, and research on the safety of these types of rods was conducted after the disaster. The method of depositing chromium onto the existing Zr-Nb alloy fuel rods is being considered as a means by which to compensate for the weakness of Zr-Nb alloy rods because chromium is strong against oxidation at high temperatures and has high strength. In order to secure these advantages, it is important to maintain the Cr thickness of the rods and properly inspect the rods before and during their use in power generation. Eddy current testing is a typical means of evaluating the thickness of thin metals and detecting surface defects. Depending on the size and shape of the inspected object, various eddy current sensors can be applied. In particular, because pancake sensors can be manufactured in very small sizes, they can be used for inspections even in narrow spaces, such as a nuclear fuel assembly. In this study, an eddy current technique was developed to confirm the feasibility of Cr coating thickness evaluations. After determining the design parameters of the pancake sensor by means of a FEM simulation, a FPCB pancake sensor was manufactured and the optimal frequency was selected by measuring minute changes in the Cr-coating thickness using the developed sensor.

  • https://doi.org/10.1016/j.net.2023.05.035 인용 PDF

Proficiency testing of cadmium and lead in polypropylene resin (폴리프로필렌 수지 중 카드뮴과 납 측정 숙련도시험)

  • Cho, K.H.;Lim, M.C.;Min, H.S.;Han, M.S.;Song, H.J.;Park, C.J.
    • Analytical Science and Technology
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    • v.20 no.3
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    • pp.183-192
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    • 2007

  • The various environmental regulation directives such as RoHS (restriction of hazardous substances in electrical and electronic products) and WEEE (waste from electrical and electronic equipments) are practically used as the technical barrier in international trade (TBT) of vehicles and electrical and electronic products recently. Regarding such an environmental regulation, Korea Research Institute of Standards Science (KRISS) organized a proficiency testing scheme to establish the reliability of measurement results produced by the relevant research institutes and test laboratories in Korea. Participants were 31 laboratories related to production of the electrical and electronic equipments and mobile vehicles. Two polypropylene samples of pellet type were employed as the proficiency testing materials (PTMs). Cadmium and lead were the analytes chosen among six components regulated in European Union (EU) RoHS directive. The PTMs were sent to the participants by post on September $1^{st}$ 2006, and deadline for results submission were October $10^{th}$ 2006. The results of each laboratory were evaluated in comparison with KRISS reference values using Robustic Z-score and Youden plot methods. The results of the various sample digestion methods were also compared. Most of participants reported good agreement within 10 % range of reference values. However, results from several laboratories showed significant biases from reference values. These laboratories should establish the quality assurance system for improvement of the measurement reliability.

  • https://doi.org/10.5806/AST.2007.20.3.183 인용 PDF KSCI